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• How can I overwrite a System.Drawing.Bitmap onto an existing GDI bitmap?

  - by MusiGenesis

  If I have a .Net Bitmap, I can create from it a GDI bitmap by calling the Bitmap's GetHbitmap() method. Bitmap bmp = new Bitmap(100, 100); IntPtr gdiBmp = bmp.GetHbitmap(); This works fine, but every time you call GetHbitmap, Windows has to allocate new memory for the object that gdiBmp references. What I'd like to do - if possible - is write a function (I know PInvoke will be necessary here) that also generates a GDI bitmap copy of a Bitmap, but that uses an existing object instead of allocating a new one. So it would look something like this (if it were an extension method of Bitmap): //void OverwriteHbitmap(IntPtr gdi) Bitmap bmp1 = new Bitmap(100, 100); IntPtr gdi1 = bmp1.GetHbitmap(); Bitmap bmp2 = new Bitmap(100, 100); bmp2.OverwriteHbitmap(gdi1); How can I do this? I assume I'll need to know the structure of a GDI bitmap, and probably I can use LockBits and BitmapData for this, but I'm not sure exactly how.

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• What is the cause of these Visual Studio 2010 errors & warnings?

  - by volpack

  I don't know the cause of these errors I am receiving from Visual Studio 2010. This is the code from my program from line 343 to line 408: int create_den_from_img(char *img_file_name_part, int xlen, int ylen, int zlen ) { IplImage* imgs = 0; char str[80]; unsigned char *data,*imgdata; /* allocating memory */ data = (unsigned char *) malloc(xlen * ylen * zlen * sizeof(unsigned char) ); if(data==NULL) { printf("error in allocating memory \n"); exit(1); } /* Getting the filename & iterating through tiff images */ for(int k = 0; k < zlen; k++) { int count=2; int tmp=k+1; while(tmp/10) { count=count-1; tmp=tmp/10; } switch(count) { case 2:sprintf(str,"%s00%d.tif",img_file_name_part,k+1); break; case 1:sprintf(str,"%s0%d.tif",img_file_name_part,k+1); break; default:sprintf(str,"%s%d.tif",img_file_name_part,k+1); break; } printf("%s\n",str); /* Loading Image using OpenCV */ imgs=cvLoadImage(str,-1); if(imgs==NULL) { printf("error in opening image \n"); exit(1); } imgdata=(uchar *)imgs->imageData; for(int j =0; j < ylen; j++) { for(int i =0; i < xlen; i++) { data[ k*xlen*ylen + j*xlen + i ] = imgdata[ j*xlen+i ]; } } cvReleaseImage(&imgs ); } /* populating `data` variable is done. So, calling `write_den` */ if(write_den("test.den",data,xlen,ylen,zlen)==0) { printf("Error in creating den file\n"); exit(1); } printf("Den file created\n"); } These are the list of errors: Error 3 error C2143: syntax error : missing ';' before 'type' c:\examples\denfile.c 358 1 MTP_TEST Error 4 error C2143: syntax error : missing ';' before 'type' c:\examples\denfile.c 358 1 MTP_TEST Error 5 error C2143: syntax error : missing ')' before 'type' c:\examples\denfile.c 358 1 MTP_TEST Error 6 error C2143: syntax error : missing ';' before 'type' c:\examples\denfile.c 358 1 MTP_TEST Error 7 error C2065: 'k' : undeclared identifier c:\examples\denfile.c 358 1 MTP_TEST Error 9 error C2065: 'k' : undeclared identifier c:\examples\denfile.c 358 1 MTP_TEST Error 10 error C2059: syntax error : ')' c:\examples\denfile.c 358 1 MTP_TEST Error 11 error C2143: syntax error : missing ';' before '{' c:\examples\denfile.c 359 1 MTP_TEST Error 12 error C2065: 'k' : undeclared identifier c:\examples\denfile.c 361 1 MTP_TEST Error 13 error C2065: 'k' : undeclared identifier c:\examples\denfile.c 370 1 MTP_TEST Error 14 error C2065: 'k' : undeclared identifier c:\examples\denfile.c 372 1 MTP_TEST Error 15 error C2065: 'k' : undeclared identifier c:\examples\denfile.c 374 1 MTP_TEST Error 16 error C2143: syntax error : missing ';' before 'type' c:\examples\denfile.c 388 1 MTP_TEST Error 17 error C2143: syntax error : missing ';' before 'type' c:\examples\denfile.c 388 1 MTP_TEST Error 18 error C2143: syntax error : missing ')' before 'type' c:\examples\denfile.c 388 1 MTP_TEST Error 19 error C2143: syntax error : missing ';' before 'type' c:\examples\denfile.c 388 1 MTP_TEST Error 20 error C2065: 'j' : undeclared identifier c:\examples\denfile.c 388 1 MTP_TEST Error 22 error C2065: 'j' : undeclared identifier c:\examples\denfile.c 388 1 MTP_TEST Error 23 error C2059: syntax error : ')' c:\examples\denfile.c 388 1 MTP_TEST Error 24 error C2143: syntax error : missing ';' before '{' c:\examples\denfile.c 389 1 MTP_TEST Error 25 error C2143: syntax error : missing ';' before 'type' c:\examples\denfile.c 390 1 MTP_TEST Error 26 error C2143: syntax error : missing ';' before 'type' c:\examples\denfile.c 390 1 MTP_TEST Error 27 error C2143: syntax error : missing ')' before 'type' c:\examples\denfile.c 390 1 MTP_TEST Error 28 error C2143: syntax error : missing ';' before 'type' c:\examples\denfile.c 390 1 MTP_TEST Error 29 error C2065: 'i' : undeclared identifier c:\examples\denfile.c 390 1 MTP_TEST Error 31 error C2065: 'i' : undeclared identifier c:\examples\denfile.c 390 1 MTP_TEST Error 32 error C2059: syntax error : ')' c:\examples\denfile.c 390 1 MTP_TEST Error 33 error C2143: syntax error : missing ';' before '{' c:\examples\denfile.c 391 1 MTP_TEST Error 34 error C2065: 'k' : undeclared identifier c:\examples\denfile.c 392 1 MTP_TEST Error 35 error C2065: 'j' : undeclared identifier c:\examples\denfile.c 392 1 MTP_TEST Error 36 error C2065: 'i' : undeclared identifier c:\examples\denfile.c 392 1 MTP_TEST Error 37 error C2065: 'j' : undeclared identifier c:\examples\denfile.c 392 1 MTP_TEST Error 38 error C2065: 'i' : undeclared identifier c:\examples\denfile.c 392 1 MTP_TEST I've been getting these kind of errors all day long. Sometimes the code compiles, while at other time it doesn't. Its really annoying.

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• playing only part of a sound using FMOD

  - by carneades

  I'm trying to play only part of a sound using FMOD, say frames 50000-100000 of a 200000 frame file. I have found a couple of ways to seek forward (i.e. to start playback at frame 50000) but I have not found a way to make sure the sound stops playing at 100000. Is there any way FMOD can natively do this without having to add lbsndfile or the like into the picture? I should also mention that I am using the streaming option. I have to assume that these sounds are arbitrarily large and cannot be comfortably/quickly loaded into memory.

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• Silverlight WCF service acting strange

  - by Caleb Sandfort

  Hi I have a silverlight project that calls into a wcf service. Everything works fine on my local machine. However when I deploy to a virtual machine, with the exact same query the wcf service returns, but the result is empty. I've tried debugging, but have not been able to get it to break in the wcf service. Any ideas what the problem could be, or how I could go about debugging it? Thanks I figured out what the problem is, but am not sure what the solution is. In my silverlight project the wcf service I am referencing is http://localhost/.../SilverlightApiService.svc I used fiddler on my vm to see the request that was made and instead of trying to contact the above service, it was trying to contact: http:///.../SilverlightApiService.svc So, for some reason my machine name is getting inserted in there instead of localhost. Any thoughts on this would be appreciated.

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• transaction log shipping sql server 2005 to 2008

  - by Andrew Jahn

  I have a reporting setup with SSRS on our sql server 2005 database. Because sql server 2008 is not supported by the main program which populates our database we are stuck with 2005 on our prod database. Unfortunately when I run our weekly check reports the web interface constantly times out because the server cant do the conversion to PDF. I've read that sql server 2008's SSRS is ALOT better with memory management. I was wondering if I can do some kind transact log shipping subscription publication from 2005 to 2008? Am I chasing a dream here.

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• Template inheritence c++

  - by Chris Condy

  I have made a template singleton class, I have also made a data structure that is templated. My question is; how do I make my templated data structure inherit from a singleton so you can only have one float type of this structure? I have tested both seperate and have found no problems. Code provided under... (That is the problem) template <class Type> class AbstractRManagers : public Singleton<AbstractRManagers<Type> > The problem is the code above doesn't work I get alot of errors. I cant get it to no matter what I do template a templated singleton class... I was asking for maybe advice or maybe if the code above is incorrect guidence? #ifndef SINGLETON_H #define SINGLETON_H template <class Type> class Singleton { public: virtual ~Singleton(); Singleton(); static Type* m_instance; }; template <class Type> Type* Singleton<Type>::m_instance = 0; #include "Singleton.cpp" #endif #ifndef SINGLETON_CPP #define SINGLETON_CPP #include "Singleton.h" template <class Type> Singleton<Type>::Singleton() { } template <class Type> Singleton<Type>::~Singleton() { } template <class Type> Type* Singleton<Type>::getInstance() { if(m_instance==nullptr) { m_instance = new Type; } return m_instance; } #endif #ifndef ABSTRACTRMANAGERS_H #define ABSTRACTRMANAGERS_H #include <vector> #include <map> #include <stack> #include "Singleton.h" template <class Type> class AbstractRManagers : public Singleton<AbstractRManagers<Type> > { public: virtual ~AbstractRManagers(); int insert(Type* type, std::string name); Type* remove(int i); Type* remove(std::string name); Type* get(int i); Type* getS(std::string name); int get(std::string name); int get(Type* i); bool check(std::string name); int resourceSize(); protected: private: std::vector<Type*> m_resources; std::map<std::string,int> m_map; std::stack<int> m_freePos; }; #include "AbstractRManagers.cpp" #endif #ifndef ABSTRACTRMANAGERS_CPP #define ABSTRACTRMANAGERS_CPP #include "AbstractRManagers.h" template <class Type> int AbstractRManagers<Type>::insert(Type* type, std::string name) { int i=0; if(!check(name)) { if(m_freePos.empty()) { m_resources.push_back(type); i = m_resources.size()-1; m_map[name] = i; } else { i = m_freePos.top(); m_freePos.pop(); m_resources[i] = type; m_map[name] = i; } } else i = -1; return i; } template <class Type> int AbstractRManagers<Type>::resourceSize() { return m_resources.size(); } template <class Type> bool AbstractRManagers<Type>::check(std::string name) { std::map<std::string,int>::iterator it; it = m_map.find(name); if(it==m_map.end()) return false; return true; } template <class Type> Type* AbstractRManagers<Type>::remove(std::string name) { Type* temp = m_resources[m_map[name]]; if(temp!=NULL) { std::map<std::string,int>::iterator it; it = m_map[name]; m_resources[m_map[name]] = NULL; m_freePos.push(m_map[name]); delete (*it).second; delete (*it).first; return temp; } return NULL; } template <class Type> Type* AbstractRManagers<Type>::remove(int i) { if((i < m_resources.size())&&(i > 0)) { Type* temp = m_resources[i]; m_resources[i] = NULL; m_freePos.push(i); std::map<std::string,int>::iterator it; for(it=m_map.begin();it!=m_map.end();it++) { if((*it).second == i) { delete (*it).second; delete (*it).first; return temp; } } return temp; } return NULL; } template <class Type> int AbstractRManagers<Type>::get(Type* i) { for(int i2=0;i2<m_resources.size();i2++) { if(i == m_resources[i2]) { return i2; } } return -1; } template <class Type> Type* AbstractRManagers<Type>::get(int i) { if((i < m_resources.size())&&(i >= 0)) { return m_resources[i]; } return NULL; } template <class Type> Type* AbstractRManagers<Type>::getS(std::string name) { return m_resources[m_map[name]]; } template <class Type> int AbstractRManagers<Type>::get(std::string name) { return m_map[name]; } template <class Type> AbstractRManagers<Type>::~AbstractRManagers() { } #endif #include "AbstractRManagers.h" struct b { float x; }; int main() { b* a = new b(); AbstractRManagers<b>::getInstance()->insert(a,"a"); return 0; } This program produces next errors when compiled : 1> main.cpp 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::stack<_Ty,_Container> &,const std::stack<_Ty,_Container> &)' : could not deduce template argument for 'const std::stack<_Ty,_Container> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\stack(166) : see declaration of 'std::operator <' 1> c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(124) : while compiling class template member function 'bool std::less<_Ty>::operator ()(const _Ty &,const _Ty &) const' 1> with 1> [ 1> _Ty=std::string 1> ] 1> c:\program files\microsoft visual studio 10.0\vc\include\map(71) : see reference to class template instantiation 'std::less<_Ty>' being compiled 1> with 1> [ 1> _Ty=std::string 1> ] 1> c:\program files\microsoft visual studio 10.0\vc\include\xtree(451) : see reference to class template instantiation 'std::_Tmap_traits<_Kty,_Ty,_Pr,_Alloc,_Mfl>' being compiled 1> with 1> [ 1> _Kty=std::string, 1> _Ty=int, 1> _Pr=std::less<std::string>, 1> _Alloc=std::allocator<std::pair<const std::string,int>>, 1> _Mfl=false 1> ] 1> c:\program files\microsoft visual studio 10.0\vc\include\xtree(520) : see reference to class template instantiation 'std::_Tree_nod<_Traits>' being compiled 1> with 1> [ 1> _Traits=std::_Tmap_traits<std::string,int,std::less<std::string>,std::allocator<std::pair<const std::string,int>>,false> 1> ] 1> c:\program files\microsoft visual studio 10.0\vc\include\xtree(659) : see reference to class template instantiation 'std::_Tree_val<_Traits>' being compiled 1> with 1> [ 1> _Traits=std::_Tmap_traits<std::string,int,std::less<std::string>,std::allocator<std::pair<const std::string,int>>,false> 1> ] 1> c:\program files\microsoft visual studio 10.0\vc\include\map(81) : see reference to class template instantiation 'std::_Tree<_Traits>' being compiled 1> with 1> [ 1> _Traits=std::_Tmap_traits<std::string,int,std::less<std::string>,std::allocator<std::pair<const std::string,int>>,false> 1> ] 1> c:\users\chris\desktop\311\ideas\idea1\idea1\abstractrmanagers.h(28) : see reference to class template instantiation 'std::map<_Kty,_Ty>' being compiled 1> with 1> [ 1> _Kty=std::string, 1> _Ty=int 1> ] 1> c:\users\chris\desktop\311\ideas\idea1\idea1\abstractrmanagers.h(30) : see reference to class template instantiation 'AbstractRManagers<Type>' being compiled 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::stack<_Ty,_Container> &,const std::stack<_Ty,_Container> &)' : could not deduce template argument for 'const std::stack<_Ty,_Container> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\stack(166) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::stack<_Ty,_Container> &,const std::stack<_Ty,_Container> &)' : could not deduce template argument for 'const std::stack<_Ty,_Container> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\stack(166) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::deque<_Ty,_Alloc> &,const std::deque<_Ty,_Alloc> &)' : could not deduce template argument for 'const std::deque<_Ty,_Alloc> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\deque(1725) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::deque<_Ty,_Alloc> &,const std::deque<_Ty,_Alloc> &)' : could not deduce template argument for 'const std::deque<_Ty,_Alloc> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\deque(1725) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::deque<_Ty,_Alloc> &,const std::deque<_Ty,_Alloc> &)' : could not deduce template argument for 'const std::deque<_Ty,_Alloc> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\deque(1725) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\xtree(1885) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\xtree(1885) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\xtree(1885) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::vector<_Ty,_Ax> &,const std::vector<_Ty,_Ax> &)' : could not deduce template argument for 'const std::vector<_Ty,_Ax> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\vector(1502) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::vector<_Ty,_Ax> &,const std::vector<_Ty,_Ax> &)' : could not deduce template argument for 'const std::vector<_Ty,_Ax> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\vector(1502) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::vector<_Ty,_Ax> &,const std::vector<_Ty,_Ax> &)' : could not deduce template argument for 'const std::vector<_Ty,_Ax> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\vector(1502) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::unique_ptr<_Ty,_Dx> &,const std::unique_ptr<_Ty2,_Dx2> &)' : could not deduce template argument for 'const std::unique_ptr<_Ty,_Dx> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\memory(2582) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::unique_ptr<_Ty,_Dx> &,const std::unique_ptr<_Ty2,_Dx2> &)' : could not deduce template argument for 'const std::unique_ptr<_Ty,_Dx> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\memory(2582) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::unique_ptr<_Ty,_Dx> &,const std::unique_ptr<_Ty2,_Dx2> &)' : could not deduce template argument for 'const std::unique_ptr<_Ty,_Dx> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\memory(2582) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(1356) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(1356) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(1356) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Revranit<_RanIt,_Base> &,const std::_Revranit<_RanIt2,_Base2> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(1179) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Revranit<_RanIt,_Base> &,const std::_Revranit<_RanIt2,_Base2> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(1179) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Revranit<_RanIt,_Base> &,const std::_Revranit<_RanIt2,_Base2> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(1179) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\utility(318) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\utility(318) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'const std::string' 1> c:\program files\microsoft visual studio 10.0\vc\include\utility(318) : see declaration of 'std::operator <' 1>c:\program files\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2676: binary '<' : 'const std::string' does not define this operator or a conversion to a type acceptable to the predefined operator ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

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• WPF Two Commands handlers, One Command

  - by Aran Mulholland

  Im deriving from a third party control. It is implementing ApplicationCommands.SelectAll. However the behaviour i want is slightly different. there is no virtual method i can override, and when i register a class handler, like so CommandManager.RegisterClassCommandBinding(typeof(MyDerivedControl), new CommandBinding(ApplicationCommands.SelectAll, new ExecutedRoutedEventHandler(OnExecutedSelectAll), new CanExecuteRoutedEventHandler(OnCanExecuteSelectAll))); My methods do not get called. The third party control i am deriving from is marking e.Handled=true; in its command handlers ( i know this cause i have seen the source, but i cant modify it ) What can i do?

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• exe files and Python

  - by Sorush Rabiee

  i have some questions about python: 1- How to build .exe files from .py files? 2- How to run a program with arguments and receive the result by python code? 3- How to load .NET library in python code (or write python in VS.NET IDE [!?])? 4- is built-in integer of python 3.1 something like a string? it calculates 200! in less than one second and calculates 2^1 to 2^7036 (by a simple recursive algorithm & writing them to a text file) with a 1.75GHz cpu in 4 minuets, so if it is a string, how it can be so fast like this? is there a great difference between memory type and logical calculation of python with c++? 5- what is the best python practice? how can i be an expert?

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• integrating cc.net with uppercut

  - by deepasundarip

  Hi, I installed uppercut in my system successfully, Then i installed cc.net, for automated build revision number, I followed all the steps in the following site, http://ferventcoder.com/archive/2009/05/21/uppercut---automated-builds---cruisecontrol.net-integration.aspx The same config code in that site i used to integrate but still i could find the following error when i run the cc.net svn folder Unable to execute file [D:\CodeBuild\abc\svn]. The file may not exist or may not be executable. --- System.ComponentModel.Win32Exception: The system cannot find the file specified.. Is there any different procedure to install cc.net?? I just run the exe and it said set virtual memory manually, When does the build and revision number increase?? Please help me......... I m n trouble

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• Is a switch statement the fastest way to implement operator interpretation in Java

  - by Mordan

  Is a switch statement the fastest way to implement operator interpretation in Java public boolean accept(final int op, int x, int val) { switch (op) { case OP_EQUAL: return x == val; case OP_BIGGER: return x > val; case OP_SMALLER: return x < val; default: return true; } } In this simple example, obviously yes. Now imagine you have 1000 operators. would it still be faster than a class hierarchy? Is there a threshold when a class hierarchy becomes more efficient in speed than a switch statement? (in memory obviously not) abstract class Op { abstract public boolean accept(int x, int val); } And then one class per operator.

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• Can JAXB Incrementally Marshall An Object?

  - by Intellectual Tortoise

  I've got a fairly simple, but potentially large structure to serialize. Basically the structure of the XML will be: <simple_wrapper> <main_object_type> <sub_objects> </main_object_type> ... main_object_type repeats up to 5,000 times </simple_wrapper> The main_object_type can have a significant amount of data. On my first 3,500 record extract, I had to give the JVM way more memory than it should need. So, I'd like to write out to disk after each (or a bunch of) main_object_type. I know that setting Marshaller.JAXB_FRAGMENT would allow it fragments, but I loose the outer xml document tags and the <simple_wrapper>. Any suggestions?

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• WPF binding and pointers

  - by Eran

  hey guys, I have a WPF application that contains windows with few user controls and Coordinator object. the window and all its user controls pointing to an object, which instace is in the Coordinator, by thier DataContext. the problem is that I want to change this object (e.g. create new object()) in the Coordinator but I want all the dataContexts to point to the new object. I tried to send the object by ref to the window constructor but it didn't help. any idea about how can I rewrite the memory location that all pointers are pointing to? (I don't want to repalce the properties in object since its a lot of work nor to use a middle object that points to the replaced object) Thanks Eran

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• How to list all attached USB devices in Visual C++

  - by vinzenzweber

  In Short: I need to detect hotplug events of my USB CDC device by PID/VID and get the corresponding virtual COM port which was created by Windows in Visual C++ and in the end create a dll. I have a USB CDC device which I need to be notified of when connected/disconnected on Windows. My approach is to use RegisterDeviceNotification and an "invisible" Window to receive WM_DEVICECHANGE notifications. This part is working so far. Now as far as I found out I need to get the list of USB devices that is plugged, iterate over it and filter out the devices with my PID/VID? I assume that I am then able to get more informations about the device including the COM port? Is the only way to achieve my goal to use SetupDi calls in setupapi.h? Is using WDK / DDK the only way to achieve my goal? As soon as that is working I open-source it on http://github.com/vinzenzweber/USBEventHandler. The Mac version is available already!

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• java Finalize method call

  - by Rajesh Kumar J

  The following is my Class code import java.net.*; import java.util.*; import java.sql.*; import org.apache.log4j.*; class Database { private Connection conn; private org.apache.log4j.Logger log ; private static Database dd=new Database(); private Database(){ try{ log= Logger.getLogger(Database.class); Class.forName("com.mysql.jdbc.Driver"); conn=DriverManager.getConnection("jdbc:mysql://localhost/bc","root","root"); conn.setReadOnly(false); conn.setAutoCommit(false); log.info("Datbase created"); /*Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); conn=DriverManager.getConnection("jdbc:odbc:rmldsn"); conn.setReadOnly(false); conn.setAutoCommit(false);*/ } catch(Exception e){ log.info("Cant Create Connection"); } } public static Database getDatabase(){ return dd; } public Connection getConnection(){ return conn; } @Override protected void finalize()throws Throwable { try{ conn.close(); Runtime.getRuntime().gc(); log.info("Database Close"); } catch(Exception e){ log.info("Cannot be closed Database"); } finally{ super.finalize(); } } } This can able to Initialize Database Object only through getDatabase() method. The below is the program which uses the single Database connection for the 4 threads. public class Main extends Thread { public static int c=0; public static int start,end; private int lstart,lend; public static Connection conn; public static Database dbase; public Statement stmt,stmtEXE; public ResultSet rst; /** * @param args the command line arguments */ static{ dbase=Database.getDatabase(); conn=dbase.getConnection(); } Main(String s){ super(s); try{ stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE); start=end; lstart=start; end=end+5; lend=end; System.out.println("Start -" +lstart +" End-"+lend); } catch(Exception e){ e.printStackTrace(); } } @Override public void run(){ try{ URL url=new URL("http://localhost:8084/TestWeb/"); rst=stmt.executeQuery("SELECT * FROM bc.cdr_calltimestamp limit "+lstart+","+lend); while(rst.next()){ try{ rst.updateInt(2, 1); rst.updateRow(); conn.commit(); HttpURLConnection httpconn=(HttpURLConnection) url.openConnection(); httpconn.setDoInput(true); httpconn.setDoOutput(true); httpconn.setRequestProperty("Content-Type", "text/xml"); //httpconn.connect(); String reqstring="<?xml version=\"1.0\" encoding=\"US-ASCII\"?>"+ "<message><sms type=\"mt\"><destination messageid=\"PS0\"><address><number" + "type=\"international\">"+ rst.getString(1) +"</number></address></destination><source><address>" + "<number type=\"unknown\"/></address></source><rsr type=\"success_failure\"/><ud" + "type=\"text\">Hello World</ud></sms></message>"; httpconn.getOutputStream().write(reqstring.getBytes(), 0, reqstring.length()); byte b[]=new byte[httpconn.getInputStream().available()]; //System.out.println(httpconn.getContentType()); httpconn.getInputStream().read(b); System.out.println(Thread.currentThread().getName()+new String(" Request"+rst.getString(1))); //System.out.println(new String(b)); httpconn.disconnect(); Thread.sleep(100); } catch(Exception e){ e.printStackTrace(); } } System.out.println(Thread.currentThread().getName()+" "+new java.util.Date()); } catch(Exception e){ e.printStackTrace(); } } public static void main(String[] args) throws Exception{ System.out.println(new java.util.Date()); System.out.println("Memory-before "+Runtime.getRuntime().freeMemory()); Thread t1=new Main("T1-"); Thread t2=new Main("T2-"); Thread t3=new Main("T3-"); Thread t4=new Main("T4-"); t1.start(); t2.start(); t3.start(); t4.start(); System.out.println("Memory-after "+Runtime.getRuntime().freeMemory()); } } I need to Close the connection after all the threads gets executed. Is there any good idea to do so. Kindly help me out in getting this work.

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• Public and Internal members in an Internal class?

  - by Noldorin

  Ok, so this may be a bit of a silly question, and there's certainly the obvious answer, but I was curious if I've missed any subtleties here. Is there any difference in terms of visibility/usability between a public member declared in an internal class and an internal member declared in an internal class? i.e. between internal class Foo { public void Bar() { } } and internal class Foo { internal void Bar() { } } If you declared the method as public and also virtual, and then overrode it in a derived class that is public, the reason for using this modifier is clear. However, is this the only situation... am I missing something else?

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• How to structure a Genetic Algorithm class hierarchy?

  - by MahlerFive

  I'm doing some work with Genetic Algorithms and want to write my own GA classes. Since a GA can have different ways of doing selection, mutation, cross-over, generating an initial population, calculating fitness, and terminating the algorithm, I need a way to plug in different combinations of these. My initial approach was to have an abstract class that had all of these methods defined as pure virtual, and any concrete class would have to implement them. If I want to try out two GAs that are the same but with different cross-over methods for example, I would have to make an abstract class that inherits from GeneticAlgorithm and implements all the methods except the cross-over method, then two concrete classes that inherit from this class and only implement the cross-over method. The downside to this is that every time I want to swap out a method or two to try out something new I have to make one or more new classes. Is there another approach that might apply better to this problem?

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• Best resource for serious Commodore 64 programming.

  - by postfuturist

  What is the best resource for serious Commodore 64 programming? Assume that serious programming on the Commodore 64 is not done in BASIC V2 that ships with the Commodore 64. I feel like most of the knowledge is tied up in old books and not available on the internet. All that I have found online are either very beginner style introductions to Commodore 64 programming (Hello world), or arcane demo-coder hacks to take advantage of strange parts of the hardware. I haven't found a well-explained list of opcodes, memory locations for system calls, and general mid-level examples and tips. Main portals I have found: lemon64 C-64 Scene Database c64web Actually hosted on a Commodore 64! Tools I have found: cc65 A C compiler that can target Commodore 64.

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• Python: slicing a very large binary file

  - by Duncan Tait

  Say I have a binary file of 12GB and I want to slice 8GB out of the middle of it. I know the position indices I want to cut between. How do I do this? Obviously 12GB won't fit into memory, that's fine, but 8GB won't either... Which I thought was fine, but it appears binary doesn't seem to like it if you do it in chunks! I was appending 10MB at a time to a new binary file and there are discontinuities on the edges of each 10MB chunk in the new file. Is there a Pythonic way of doing this easily?

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• VS2008 CR report viewer. Print and Export to PDF is not working

  - by S M Kamran

  I've a web project in VS2008. The problem is that from a web report viewer; report is not getting printed or exported to pdf. Report is being shown alright but when print button or export button is pressed, nothing happens. No errors or crash. Just nothing got happened. Default printer is set alright and I am able to print from that machine.. Am I missing some thing here??? Earlier when I installed the application in a new virtual directory report was not getting shown then I've copied aspnet_Client folder in my newly created web application root and the report was then made visible. However the print and export functionality is not working.

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• C# Object Creation from Datatable

  - by Jonesy

  Hi Folks, Im just getting my head round C#. I've been creating classes and objects so say i created a class called Member: public class Member { public int MemberID; public string FirstName; public string LastName; public string UserName; } and i create a new object of that class by doing this: Member Billy = new Member(); Billy.UserName = "Jonesy"; Billy.FirstName = "Billy"; Billy.LastName = "Jones"; Thats all fine but what if I've queried a database and gotten back 5 members, can I create objects on the fly? Or what is the best way to store these members in memory? I've used VB.Net where I would just add them into a datatable. But I've never really done any object-oriented programming before and thought since I'm learning C sharp nows the best time to learn OOP.. Any help most appreciated! Jonesy

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• Base64 Encode String in VBScript

  - by Patrick Cuff

  I have a web service load driver that's a Windows Script File (WSF), that includes some VBScript and JavaScript files. My web service requires that the incoming message is base64 encoded. I currently have a VBScript function that does this, but it's very inefficient (memory intensive, mostly due to VBScripts awful string concatenation) [Aside; Yes, I've seen Jeff's latest blog post. The concatenation is happening in a loop across messages that are 1,000's to 10,000's bytes in size.] I've tried using some custom string concatenation routines; one using an array and one using ADODB.Stream. These help, a little, but I think it would help more if I had some other way of encoding the message rather than via my own VBS function. Is there some other way of encoding my message, preferebly using native Windows methods?

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• Class member functions instantiated by traits

  - by Jive Dadson

  I am reluctant to say I can't figure this out, but I can't figure this out. I've googled and searched Stack Overflow, and come up empty. The abstract, and possibly overly vague form of the question is, how can I use the traits-pattern to instantiate non-virtual member functions? The question came up while modernizing a set of multivariate function optimizers that I wrote more than 10 years ago. The optimizers all operate by selecting a straight-line path through the parameter space away from the current best point (the "update"), then finding a better point on that line (the "line search"), then testing for the "done" condition, and if not done, iterating. There are different methods for doing the update, the line-search, and conceivably for the done test, and other things. Mix and match. Different update formulae require different state-variable data. For example, the LMQN update requires a vector, and the BFGS update requires a matrix. If evaluating gradients is cheap, the line-search should do so. If not, it should use function evaluations only. Some methods require more accurate line-searches than others. Those are just some examples. The original version instantiates several of the combinations by means of virtual functions. Some traits are selected by setting mode bits that are tested at runtime. Yuck. It would be trivial to define the traits with #define's and the member functions with #ifdef's and macros. But that's so twenty years ago. It bugs me that I cannot figure out a whiz-bang modern way. If there were only one trait that varied, I could use the curiously recurring template pattern. But I see no way to extend that to arbitrary combinations of traits. I tried doing it using boost::enable_if, etc.. The specialized state information was easy. I managed to get the functions done, but only by resorting to non-friend external functions that have the this-pointer as a parameter. I never even figured out how to make the functions friends, much less member functions. The compiler (VC++ 2008) always complained that things didn't match. I would yell, "SFINAE, you moron!" but the moron is probably me. Perhaps tag-dispatch is the key. I haven't gotten very deeply into that. Surely it's possible, right? If so, what is best practice? UPDATE: Here's another try at explaining it. I want the user to be able to fill out an order (manifest) for a custom optimizer, something like ordering off of a Chinese menu - one from column A, one from column B, etc.. Waiter, from column A (updaters), I'll have the BFGS update with Cholesky-decompositon sauce. From column B (line-searchers), I'll have the cubic interpolation line-search with an eta of 0.4 and a rho of 1e-4, please. Etc... UPDATE: Okay, okay. Here's the playing-around that I've done. I offer it reluctantly, because I suspect it's a completely wrong-headed approach. It runs okay under vc++ 2008. #include <boost/utility.hpp> #include <boost/type_traits/integral_constant.hpp> namespace dj { struct CBFGS { void bar() {printf("CBFGS::bar %d\n", data);} CBFGS(): data(1234){} int data; }; template<class T> struct is_CBFGS: boost::false_type{}; template<> struct is_CBFGS<CBFGS>: boost::true_type{}; struct LMQN {LMQN(): data(54.321){} void bar() {printf("LMQN::bar %lf\n", data);} double data; }; template<class T> struct is_LMQN: boost::false_type{}; template<> struct is_LMQN<LMQN> : boost::true_type{}; struct default_optimizer_traits { typedef CBFGS update_type; }; template<class traits> class Optimizer; template<class traits> void foo(typename boost::enable_if<is_LMQN<typename traits::update_type>, Optimizer<traits> >::type& self) { printf(" LMQN %lf\n", self.data); } template<class traits> void foo(typename boost::enable_if<is_CBFGS<typename traits::update_type>, Optimizer<traits> >::type& self) { printf("CBFGS %d\n", self.data); } template<class traits = default_optimizer_traits> class Optimizer{ friend typename traits::update_type; //friend void dj::foo<traits>(typename Optimizer<traits> & self); // How? public: //void foo(void); // How??? void foo() { dj::foo<traits>(*this); } void bar() { data.bar(); } //protected: // How? typedef typename traits::update_type update_type; update_type data; }; } // namespace dj int main_() { dj::Optimizer<> opt; opt.foo(); opt.bar(); std::getchar(); return 0; }

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• Why not standard Android emulators?

  - by Gerry

  I'm new to Android, but have published iphone and bberry apps. I see that I have to create an emulator using the SDK, before I can write and test an app. Why are there no default emulators? Why not at least a Nexus one, or HTC hero emulator shipped with the product? Sure its supposed to be flexible, but why not make it easy to create hello world and play around with a virtual Android phone? Both blackberry and iphone come with default simulators when you download the sdk. Thanks, Gerry

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• How to casue a CppUnit test to fail - from C?

  - by mawg

  I'd like to have an equivalent to CPPUNIT_ASSERT, CPPUNIT_ASSERT_MESSAGE or `CPPUNIT_FAIL' which I can call from some common C code. Our code is a mix of C and C++. Some older apps and those with specific requirements are coded in C and most, especially newer, are coded in C++. However, a lot of project-agnostic, common code, such as memory buffer pools, debug tracing, etc are coded in C. When testing a C++ app in CppUnit, I'd to be able to sprinkle some ASSSERT()s which would cause any running CppUnit test to fail. Maye something like: if testing if running in debugger (Eclipse) then asm("int3"); // stop the debugger, even if no breakpoint at this line else if running CppUnit test - fail the test and move on to next else trace to log file Most of that can be run by wrapping a macro around a few #ifdefs, but I am not sure how I would cause a CppUni test to fail from C code. Can it be done?

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• problem with creating a new module using vtlib 2.1 for vtiger CRM 5.0.4

  - by gsk

  I have created a new module in vtigerCRM using the vtlib 2.1 api doc as provided in the following link. http://wiki.vtiger.com/index.php/Vtiger_CRM_5_Developer_Guide/VTLIB Though the module appears to have been created successfully I am getting the following error when I try to add a new record. ( ! ) WebServiceException: Permission to perform the operation is denied in C:\xampp\htdocs\dnbcrm\include\Webservices\Retrieve.php on line 30 Call Stack # Time Memory Function Location 1 0.0037 338824 {main}( ) ..\index.php:0 2 0.8090 21393040 include( 'C:\xampp\htdocs\dnbcrm\modules\TargetModule\Save.php' ) ..\index.php:693 3 0.8209 21498512 CRMEntity->save( ) ..\Save.php:21 4 0.9772 23107304 VTEventsManager->triggerEvent( ) ..\CRMEntity.php:859 5 0.9773 23107304 VTEventTrigger->trigger( ) ..\VTEventsManager.inc:118 6 1.0133 23415848 VTWorkflowEventHandler->handleEvent( ) ..\VTEventTrigger.inc:119 7 1.0218 23433280 VTEntityCache->forId( ) ..\VTEventHandler.inc:51 8 1.0218 23433600 VTWorkflowEntity->__construct( ) ..\VTEntityCache.inc:83 9 1.0218 23433992 vtws_retrieve( ) ..\VTEntityCache.inc:16

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