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  • OpenCV : How to display webcam capture in windows form application?

    - by sneixum
    generally we display webcam or video motion in opencv windows with : CvCapture* capture = cvCreateCameraCapture(0); cvNamedWindow( "title", CV_WINDOW_AUTOSIZE ); cvMoveWindow("title",x,y); while(1) { frame = cvQueryFrame( capture ); if( !frame ) { break; } cvShowImage( "title", frame ); char c = cvWaitKey(33); if( c == 27 ) { break; } } i tried to use pictureBox that is successful to display image in windows form with this : pictureBox1-Image = gcnew System::Drawing::Bitmap( image-width,image-height,image-widthStep,System::Drawing::Imaging::PixelFormat::Undefined, ( System::IntPtr ) image- imageData); but when im trying to display captured image from video it wont works, here is the source : CvCapture* capture = cvCreateCameraCapture(0); while(1) { frame = cvQueryFrame( capture ); if( !frame ) { break; } pictureBox1->Image = gcnew System::Drawing::Bitmap( frame->width,frame->height,frame->widthStep,System::Drawing::Imaging::PixelFormat::Undefined, ( System::IntPtr ) frame-> imageData); char c = cvWaitKey(33); if( c == 27 ) { break; } } is there anyway to use windows form instead opencv windows to show video or webcam? or is there something wrong with my code? thanks for your help.. :)

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  • what's wrong with sql statements sqlite3_column_text ??

    - by ahmet732
    if(sqlite3_open([databasePath UTF8String], & database) == SQLITE_OK) { NSLog(@"DB OPENED"); // Setup the SQL Statement and compile it for faster access const char *sqlStatement ="select name from Medicine"; sqlite3_stmt *compiledStatement; int result = sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, nil); NSLog(@"RESULT %d", result); if(result == SQLITE_OK) { NSLog(@"RESULT IS OK..."); // Loop through the results and add them to the feeds array while(sqlite3_step(compiledStatement) == SQLITE_ROW) { // Read the data from the result row NSLog(@"WHILE IS OK"); **araci = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];** NSLog(@"Data read"); NSLog(@"wow: %",araci); }//while }//if sqlite_prepare v2 // Release the compiled statement from memory sqlite3_finalize(compiledStatement); NSLog(@"compiled stmnt finalized.."); } sqlite3_close(database); NSLog(@"MA_DB CLOSED"); Questions 1 ) Everything is alright until bold code. when i run the app, throws an exception below. I have one table and one row in my db relatively, id (integer), name (varchar), desc (varchar) (I created my table using SQLite Manager). 2-) What is text type in SQLite Manager? Is that NSString? Also how can I put the string values(in table) to an NSMutableArray ? (I am really having difficulty in conversion.) *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[NSString stringWithUTF8String:]: NULL cString'

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  • Why do I get garbage output when printing an int[]?

    - by Kat
    My program is suppose to count the occurrence of each character in a file ignoring upper and lower case. The method I wrote is: public int[] getCharTimes(File textFile) throws FileNotFoundException { Scanner inFile = new Scanner(textFile); int[] lower = new int[26]; char current; int other = 0; while(inFile.hasNext()){ String line = inFile.nextLine(); String line2 = line.toLowerCase(); for (int ch = 0; ch < line2.length(); ch++) { current = line2.charAt(ch); if(current >= 'a' && current <= 'z') lower[current-'a']++; else other++; } } return lower; } And is printed out using: for(int letter = 0; letter < 26; letter++) { System.out.print((char) (letter + 'a')); System.out.println(": " + ts.getCharTimes(file)); } Where ts is a TextStatistic object created earlier in my main method. However when I run my program, instead of printing out the number of how often the character occurs it prints: a: [I@f84386 b: [I@1194a4e c: [I@15d56d5 d: [I@efd552 e: [I@19dfbff f: [I@10b4b2f And I don't know what I'm doing wrong.

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  • Compile time Meta-programming, with string literals.

    - by Hassan Syed
    I'm writing some code which could really do with some simple compile time metaprogramming. It is common practise to use empty-struct tags as compile time symbols. I need to decorate the tags with some run-time config elements. static variables seem the only way to go (to enable meta-programming), however static variables require global declarations. to side step this Scott Myers suggestion (from the third edition of Effective C++), about sequencing the initialization of static variables by declaring them inside a function instead of as class variables, came to mind. So I came up with the following code, my hypothesis is that it will let me have a compile-time symbols with string literals use-able at runtime. I'm not missing anything I hope. template<class Instance> class TheBestThing { public: void set_name(const char * name_in) { get_name() = std::string(name_in); } void set_fs_location(const char * fs_location_in) { get_fs_location() = std::string(fs_location_in); } std::string & get_fs_location() { static std::string fs_location; return fs_location; } std::string & get_name() { static std::string name; return name; } }; struct tag {}; int main() { TheBestThing<tag> x; x.set_name("xyz"); x.set_fs_location("/etc/lala"); ImportantObject<x> SinceSlicedBread; }

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  • fmod VS2008 unresolved externals in dependant project

    - by Tom J Nowell
    Im currently trying to use the latest stable fmod ex in my project. I have a main executable in a project called engine4, and a project named DX9Platform in the solution as well which ti depends on. All the fmod code is in this DX9Platform project, which generates a lib file. DX9Platform includes fmodex_vc.lib and builds fine. However buildign Engien4 results in unresolved external symbol messages referencing files that use fmod in the DX9Platform project I have tried adding fmodex_vc.lib to the Engine4 project, with no success, how do I fix this? Heres the linker output: 3>------ Build started: Project: Engine4, Configuration: Release Direct3D9 Win32 ------ 3>Linking... 3>DX9PlatformLib.lib(CFmodSound.obj) : error LNK2001: unresolved external symbol _FMOD_System_Create 3>DX9PlatformLib.lib(CFmodSound.obj) : error LNK2001: unresolved external symbol "public: enum FMOD_RESULT __thiscall FMOD::System::createSound(char const *,unsigned int,struct FMOD_CREATESOUNDEXINFO *,class FMOD::Sound * *)" (?createSound@System@FMOD@@QAE?AW4FMOD_RESULT@@PBDIPAUFMOD_CREATESOUNDEXINFO@@PAPAVSound@2@@Z) 3>DX9PlatformLib.lib(CFmodSound.obj) : error LNK2001: unresolved external symbol "public: enum FMOD_RESULT __thiscall FMOD::System::getVersion(unsigned int *)" (?getVersion@System@FMOD@@QAE?AW4FMOD_RESULT@@PAI@Z) 3>DX9PlatformLib.lib(CFmodSound.obj) : error LNK2001: unresolved external symbol "public: enum FMOD_RESULT __thiscall FMOD::System::init(int,unsigned int,void *)" (?init@System@FMOD@@QAE?AW4FMOD_RESULT@@HIPAX@Z) 3>DX9PlatformLib.lib(CFModAudioObject.obj) : error LNK2001: unresolved external symbol "public: enum FMOD_RESULT __thiscall FMOD::System::playSound(enum FMOD_CHANNELINDEX,class FMOD::Sound *,bool,class FMOD::Channel * *)" (?playSound@System@FMOD@@QAE?AW4FMOD_RESULT@@W4FMOD_CHANNELINDEX@@PAVSound@2@_NPAPAVChannel@2@@Z) 3>DX9PlatformLib.lib(CFModAudioObject.obj) : error LNK2001: unresolved external symbol "public: enum FMOD_RESULT __thiscall FMOD::Channel::getPaused(bool *)" (?getPaused@Channel@FMOD@@QAE?AW4FMOD_RESULT@@PA_N@Z) 3>DX9PlatformLib.lib(CFModAudioObject.obj) : error LNK2001: unresolved external symbol "public: enum FMOD_RESULT __thiscall FMOD::Channel::setPaused(bool)" (?setPaused@Channel@FMOD@@QAE?AW4FMOD_RESULT@@_N@Z) 3>DX9PlatformLib.lib(CFModAudioObject.obj) : error LNK2001: unresolved external symbol "public: virtual class IAudioObject * __thiscall CFModAudioObject::LoadFile(char const *)" (?LoadFile@CFModAudioObject@@UAEPAVIAudioObject@@PBD@Z) 3>D:\media\desktop\engine4\Engine4\Output\Release Direct3D9\Engine4.exe : fatal error LNK1120: 8 unresolved externals 3>Build log was saved at "file://d:\media\desktop\engine4\Engine4\Engine4\intermediate\Release Direct3D9\BuildLog.htm" 3>Engine4 - 9 error(s), 0 warning(s) ========== Build: 1 succeeded, 1 failed, 0 up-to-date, 1 skipped ==========

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  • PInvoke Unbalances the stack

    - by Giawa
    Good afternoon, I have been working on a dll that can use CORBA to communicate to an application that is network aware. The code works fine if I run it as a C++ console application. However, I have gotten stuck on exporting the methods as a dll. The methods seems to export fine, and if I call a method with no parameters then it works as expected. I'm hung up on passing a C# string to a C++ method. My C++ method header looks like this: bool __declspec(dllexport) SpiceStart(char* installPath) My C# DLL import code is as follows: [DllImportAttribute("SchemSipc.dll", CharSet=CharSet.Ansi)] private static extern bool SpiceStart(string installPath); I call the method like so: bool success = SpiceStart(@"c:\sedatools"); The call to SpiceStart throws the exception "PInvokeStackImbalance", which "is likely because the managed PInvoke signature does not match the unmanaged target signature." Does anyone have any suggestions? If I remove the char* and string from the parameters, then the method runs just fine. However, I'd like to be able to pass the installation path of the application to the dll from C#. Thanks in advance, Giawa

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  • Can't set LinqDataSource InsertParameters from my code behind.

    - by Abe Miessler
    I have the following code that seems like it should set my insertParameter but everytime an insert happens it uses the default parameter. Do i need to do anything special to make this work? Codebehind: protected void SetInsertParams(object sender, LinqDataSourceInsertEventArgs e) { if (lbl_Personnel.Visible) { lds_Personnel.InsertParameters["BudgetLineTypeCode"].DefaultValue = "S"; } else if(lbl_Operating.Visible) { lds_Personnel.InsertParameters["BudgetLineTypeCode"].DefaultValue = "O"; } else if (lbl_SubContractor.Visible) { lds_Personnel.InsertParameters["BudgetLineTypeCode"].DefaultValue = "C"; } } From my aspx page: <asp:LinqDataSource ID="lds_Personnel" runat="server" OnSelecting="SetParams" ContextTypeName="nrm.FRGPproposal.FrgpropDataContext" TableName="BudgetLines" OnInserted="lds_Personnel_OnInserted" OnInserting="SetInsertParams" Where="ProposalID == @PropNumber &amp;&amp; BudgetLineTypeCode == @BudgetLineTypeCode" EnableDelete="True" EnableInsert="True" EnableUpdate="True"> <WhereParameters> <asp:SessionParameter Name="PropNumber" SessionField="PropNumber" Type="Int32" /> <asp:Parameter DefaultValue="S" Name="BudgetLineTypeCode" Type="Char" /> </WhereParameters> <InsertParameters> <asp:SessionParameter Name="ProposalID" SessionField="PropNumber" Type="Int32"/> <asp:Parameter DefaultValue="S" Name="BudgetLineTypeCode" Type="Char" /> </InsertParameters> </asp:LinqDataSource>

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  • Linux Device Driver - what's wrong with my device_read()?

    - by Rob
    My device /dev/my_inc is meant to take a positive integer N represented as an ascii string, and store it. Any read from /dev/my_inc will produce the ascii string representation of N + 1. The problem is that when I cat /dev/my_inc, I only get the first byte of myinc_value output to my shell, even though I have bytes_read == 2 at the end of my loop. /* Read from the device *********************/ static ssize_t device_read(struct file *filp, char *buffer, size_t length, loff_t *offset) { char c; int bytes_read = 0; int value = myinc_value + 1; printk(KERN_INFO "my_inc device_read() called with value %d and msg %s.\n", value, msg); /* No bytes read if pointer to 0 */ if (*msg_ptr == 0) return 0; /* Put the incremented value in msg */ snprintf(msg, MAX_LENGTH, "%d", value); /* Put bytes from msg into user space buffer */ while (length && *msg_ptr) { c = *(msg_ptr++); printk(KERN_INFO "%s device_read() read %c.", DEV_NAME, c); if(put_user(c, buffer++)) return -EFAULT; length--; bytes_read++; } printk("my_inc device_read() returning %d.\n", bytes_read); /* Return bytes copied */ return bytes_read; }

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  • Reading bmp file for steganography

    - by Shantanu Gupta
    I am trying to read a bmp file in C++(Turbo). But i m not able to print binary stream. I want to encode txt file into it and decrypt it. How can i do this. I read that bmp file header is of 54 byte. But how and where should i append txt file in bmp file. ? I know only Turbo C++, so it would be helpfull for me if u provide solution or suggestion related to topic for the same. int main() { ifstream fr; //reads ofstream fw; // wrrites to file char c; int random; clrscr(); char file[2][100]={"s.bmp","s.txt"}; fr.open(file[0],ios::binary);//file name, mode of open, here input mode i.e. read only if(!fr) cout<<"File can not be opened."; fw.open(file[1],ios::app);//file will be appended if(!fw) cout<<"File can not be opened"; while(!fr) cout<<fr.get(); // error should be here. but not able to find out what error is it fr.close(); fw.close(); getch(); } This code is running fine when i pass txt file in binary mode

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  • Backtracking Problem

    - by Joshua Green
    Could someone please guide me through backtracking in Prolog-C using the simple example below? Here is my Prolog file: likes( john, mary ). likes( john, emma ). likes( john, ashley ). Here is my C file: #include... term_t tx; term_t tv; term_t goal_term; functor_t goal_functor; int main( int argc, char** argv ) { argv[0] = "libpl.dll"; PL_initialise( argc, argv ); PlCall( "consult( swi( 'plwin.rc' ) )" ); PlCall( "consult( 'likes.pl' )" ); tv = PL_new_term_ref( ); PL_put_atom_chars( tv, "john" ); tx = PL_new_term_ref( ); goal_term = PL_new_term_ref( ); goal_functor = PL_new_functor( PL_new_atom( "likes" ), 2 ); PL_cons_functor( goal_term, goal_functor, tv, tx ); PlQuery q( "likes", ??? ); while ( q.next_solution( ) ) { char* solution; PL_get_atom_chars( tx, &solution ); cout << solution << endl; } PL_halt( PL_toplevel() ? 0 : 1 ); } What should I replace ??? with? Or is this the right approach to get all the backtracking results generated and printed? Thank you,

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  • android keylistener losing key taps

    - by miannelle
    I am using a keylistener to get key taps. The problem is that once you tap the delete key, the next key tap is not registering. The key tap after that keeps working. If I tap 2 deletes in a row, they work, just no other keys. They just disappear. I put in a log test before the "if (keycode" section and it shows nothing after the first delete is pressed, unless it is another delete. I am using the following code (Thanks Shawn).: itemPrice.setKeyListener(new CalculatorKeyListener()); itemPrice.setRawInputType(Configuration.KEYBOARD_12KEY); class CalculatorKeyListener extends NumberKeyListener { public int getInputType() { return InputType.TYPE_CLASS_NUMBER; } @Override public boolean onKeyDown(View view, Editable content, int keyCode, KeyEvent event) { if (keyCode >= KeyEvent.KEYCODE_0 && keyCode <= KeyEvent.KEYCODE_9) { digitPressed(keyCode - KeyEvent.KEYCODE_0); } else if (keyCode == KeyEvent.KEYCODE_DEL) { deletePressed(); } return true; } @Override protected char[] getAcceptedChars() { return new char[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; } } With this problem the keylistener provides no value to me. There must be something that I am missing. Thanks,

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  • Land of Lisp example question

    - by cwallenpoole
    I've read a lot of good things about Land of Lisp so I thought that I might go through it to see what there was to see. (defun tweak-text (lst caps lit) (when lst (let ((item (car lst)) (rest (cdr lst))) (cond ; If item = space, then call recursively starting with ret ; Then, prepend the space on to the result. ((eq item #\space) (cons item (tweak-text rest caps lit))) ; if the item is an exclamation point. Make sure that the ; next non-space is capitalized. ((member item '(#\! #\? #\.)) (cons item (tweak-text rest t lit))) ; if item = " then toggle whether we are in literal mode ((eq item #\") (tweak-text rest caps (not lit))) ; if literal mode, just add the item as is and continue (lit (cons item (tweak-text rest nil lit))) ; if either caps or literal mode = true capitalize it? ((or caps lit) (cons (char-upcase item) (tweak-text rest nil lit))) ; otherwise lower-case it. (t (cons (char-downcase item) (tweak-text rest nil nil))))))) (the comments are mine) (FYI -- the method signature is (list-of-symbols bool-whether-to-caps bool-whether-to-treat-literally) but the author shortened these to (lst caps lit).) But anyway, here's the question: This has (cond... (lit ...) ((or caps lit) ...)) in it. My understanding is that this would translate to if(lit){ ... } else if(caps || lit){...} in a C style syntax. Isn't the or statement redundant then? Is there ever a condition where the (or caps lit) condition will be called if caps is nil?

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  • Check for valid IMEI

    - by Tim
    Hi, does somebody knows how to check for a valid IMEI? I have found a function to check on this page: http://www.dotnetfunda.com/articles/article597-imeivalidator-in-vbnet-.aspx But it returns false for valid IMEI's (f.e. 352972024585360). I can validate them online on this page: http://www.numberingplans.com/?page=analysis&sub=imeinr What is the correct way(in VB.Net) to check if a given IMEI is valid? Regards, Tim PS: This function from above page must be incorrect in some way: Public Shared Function isImeiValid(ByVal IMEI As String) As Boolean Dim cnt As Integer = 0 Dim nw As String = String.Empty Try For Each c As Char In IMEI cnt += 1 If cnt Mod 2 <> 0 Then nw += c Else Dim d As Integer = Integer.Parse(c) * 2 ' Every Second Digit has to be Doubled nw += d.ToString() ' Genegrated a new number with doubled digits End If Next Dim tot As Integer = 0 For Each ch As Char In nw.Remove(nw.Length - 1, 1) tot += Integer.Parse(ch) ' Adding all digits together Next Dim chDigit As Integer = 10 - (tot Mod 10) ' Finding the Check Digit my Finding the Remainder of the sum and subtracting it from 10 If chDigit = Integer.Parse(IMEI(IMEI.Length - 1)) Then ' Checking the Check Digit with the last digit of the Given IMEI code Return True Else Return False End If Catch ex As Exception Return False End Try End Function

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  • How to Convert Non-English Characters to English Using JavaScript

    - by Adam Right
    I have a c# function which converts all non-english characters to proper characters for a given text. like as follows public static string convertString(string phrase) { int maxLength = 100; string str = phrase.ToLower(); int i = str.IndexOfAny( new char[] { 's','ç','ö','g','ü','i'}); //if any non-english charr exists,replace it with proper char if (i > -1) { StringBuilder outPut = new StringBuilder(str); outPut.Replace('ö', 'o'); outPut.Replace('ç', 'c'); outPut.Replace('s', 's'); outPut.Replace('i', 'i'); outPut.Replace('g', 'g'); outPut.Replace('ü', 'u'); str = outPut.ToString(); } // if there are other invalid chars, convert them into blank spaces str = Regex.Replace(str, @"[^a-z0-9\s-]", ""); // convert multiple spaces and hyphens into one space str = Regex.Replace(str, @"[\s-]+", " ").Trim(); // cut and trim string str = str.Substring(0, str.Length <= maxLength ? str.Length : maxLength).Trim(); // add hyphens str = Regex.Replace(str, @"\s", "-"); return str; } but i should use same function on client side with javascript. is it possible to convert above function to js ? waiting all kinds of suggestion. thanks in advance..

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  • How to fix RapidXML String ownership concerns?

    - by Roddy
    RapidXML is a fast, lightweight C++ XML DOM Parser, but it has some quirks. The worst of these to my mind is this: 3.2 Ownership Of Strings. Nodes and attributes produced by RapidXml do not own their name and value strings. They merely hold the pointers to them. This means you have to be careful when setting these values manually, by using xml_base::name(const Ch *) or xml_base::value(const Ch *) functions. Care must be taken to ensure that lifetime of the string passed is at least as long as lifetime of the node/attribute. The easiest way to achieve it is to allocate the string from memory_pool owned by the document. Use memory_pool::allocate_string() function for this purpose. Now, I understand it's done this way for speed, but this feels like an car crash waiting to happen. The following code looks innocuous but 'name' and 'value' are out of scope when foo returns, so the doc is undefined. void foo() { char name[]="Name"; char value[]="Value"; doc.append_node(doc.allocate_node(node_element, name, value)); } The suggestion of using allocate_string() as per manual works, but it's so easy to forget. Has anyone 'enhanced' RapidXML to avoid this issue?

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  • How do I test OpenCL on GPU when logged in remotely on Mac?

    - by Christopher Bruns
    My OpenCL program can find the GPU device when I am logged in at the console, but not when I am logged in remotely with ssh. Further, if I run the program as root in the ssh session, the program can find the GPU. The computer is a Snow Leopard Mac with a GeForce 9400 GPU. If I run the program (see below) from the console or as root, the output is as follows (notice the "GeForce 9400" line): 2 devices found Device #0 name = GeForce 9400 Device #1 name = Intel(R) Core(TM)2 Duo CPU P8700 @ 2.53GHz but if it is just me, over ssh, there is no GeForce 9400 entry: 1 devices found Device #0 name = Intel(R) Core(TM)2 Duo CPU P8700 @ 2.53GHz I would like to test my code on the GPU without having to be root. Is that possible? Simplified GPU finding program below: #include <stdio.h> #include <OpenCL/opencl.h> int main(int argc, char** argv) { char dname[500]; size_t namesize; cl_device_id devices[10]; cl_uint num_devices; int d; clGetDeviceIDs(0, CL_DEVICE_TYPE_ALL, 10, devices, &num_devices); printf("%d devices found\n", num_devices); for (d = 0; d < num_devices; ++d) { clGetDeviceInfo(devices[d], CL_DEVICE_NAME, 500, dname, &namesize); printf("Device #%d name = %s\n", d, dname); } return 0; } EDIT: I found essentially the same question being asked on nvidia's forums. Unfortunately, the only answer was of the form "this is the wrong forum".

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  • Cross join (pivot) with n-n table containing values

    - by Styx31
    I have 3 tables : TABLE MyColumn ( ColumnId INT NOT NULL, Label VARCHAR(80) NOT NULL, PRIMARY KEY (ColumnId) ) TABLE MyPeriod ( PeriodId CHAR(6) NOT NULL, -- format yyyyMM Label VARCHAR(80) NOT NULL, PRIMARY KEY (PeriodId) ) TABLE MyValue ( ColumnId INT NOT NULL, PeriodId CHAR(6) NOT NULL, Amount DECIMAL(8, 4) NOT NULL, PRIMARY KEY (ColumnId, PeriodId), FOREIGN KEY (ColumnId) REFERENCES MyColumn(ColumnId), FOREIGN KEY (PeriodId) REFERENCES MyPeriod(PeriodId) ) MyValue's rows are only created when a real value is provided. I want my results in a tabular way, as : Column | Month 1 | Month 2 | Month 4 | Month 5 | Potatoes | 25.00 | 5.00 | 1.60 | NULL | Apples | 2.00 | 1.50 | NULL | NULL | I have successfully created a cross-join : SELECT MyColumn.Label AS [Column], MyPeriod.Label AS [Period], ISNULL(MyValue.Amount, 0) AS [Value] FROM MyColumn CROSS JOIN MyPeriod LEFT OUTER JOIN MyValue ON (MyValue.ColumnId = MyColumn.ColumnId AND MyValue.PeriodId = MyPeriod.PeriodId) Or, in linq : from p in MyPeriods from c in MyColumns join v in MyValues on new { c.ColumnId, p.PeriodId } equals new { v.ColumnId, v.PeriodId } into values from nv in values.DefaultIfEmpty() select new { Column = c.Label, Period = p.Label, Value = nv.Amount } And seen how to create a pivot in linq (here or here) : (assuming MyDatas is a view with the result of the previous query) : from c in MyDatas group c by c.Column into line select new { Column = line.Key, Month1 = line.Where(l => l.Period == "Month 1").Sum(l => l.Value), Month2 = line.Where(l => l.Period == "Month 2").Sum(l => l.Value), Month3 = line.Where(l => l.Period == "Month 3").Sum(l => l.Value), Month4 = line.Where(l => l.Period == "Month 4").Sum(l => l.Value) } But I want to find a way to create a resultset with, if possible, Month1, ... properties dynamic. Note : A solution which results in a n+1 query : from c in MyDatas group c by c.Column into line select new { Column = line.Key, Months = from l in line group l by l.Period into period select new { Period = period.Key, Amount = period.Sum(l => l.Value) } }

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  • SUA + Visual Studio + pthreads

    - by vasek7
    Hi, I cannot compile this code under SUA: #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <pthread.h> void * thread_function(void *arg) { printf("thread_function started. Arg was %s\n", (char *)arg); // pause for 3 seconds sleep(3); // exit and return a message to another thread // that may be waiting for us to finish pthread_exit ("thread one all done"); } int main() { int res; pthread_t a_thread; void *thread_result; // create a thread that starts to run ‘thread_function’ pthread_create (&a_thread, NULL, thread_function, (void*)"thread one"); printf("Waiting for thread to finish...\n"); // now wait for new thread to finish // and get any returned message in ‘thread_result’ pthread_join(a_thread, &thread_result); printf("Thread joined, it returned %s\n", (char *)thread_result); exit(0); } I'm running on Windows 7 Ultimate x64 with Visual Studio 2008 and 2010 and I have installed: Windows Subsystem for UNIX Utilities and SDK for Subsystem for UNIX-based Applications in Microsoft Windows 7 and Windows Server 2008 R2 Include directories property of Visual Studio project is set to "C:\Windows\SUA\usr\include" What I have to configure in order to compile and run (and possibly debug) pthreads programs in Visual Studio 2010 (or 2008)?

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  • DATE lookup table (1990/01/01:2041/12/31)

    - by Frank Developer
    I use a DATE's master table for looking up dates and other values in order to control several events, intervals and calculations within my app. It has rows for every single day begining from 01/01/1990 to 12/31/2041. One example of how I use this lookup table is: A customer pawned an item on: JAN-31-2010 Customer returns on MAY-03-2010 to make an interest pymt to avoid forfeiting the item. If he pays 1 months interest, the employee enters a "1" and the app looks-up the pawn date (JAN-31-2010) in date master table and puts FEB-28-2010 in the applicable interest pymt date. FEB-28 is returned because FEB-31's dont exist! If 2010 were a leap-year, it would've returned FEB-29. If customer pays 2 months, MAR-31-2010 is returned. 3 months, APR-30... If customer pays more than 3 months or another period not covered by the date lookup table, employee manually enters the applicable date. Here's what the date lookup table looks like: { Copyright 1990:2010, Frank Computer, Inc. } { DBDATE=YMD4- (correctly sorted for faster lookup) } CREATE TABLE datemast ( dm_lookup DATE, {lookup col used for obtaining values below} dm_workday CHAR(2), {NULL=Normal Working Date,} {NW=National Holiday(Working Date),} {NN=National Holiday(Non-Working Date),} {NH=National Holiday(Half-Day Working Date),} {CN=Company Proclamated(Non-Working Date),} {CH=Company Proclamated(Half-Day Working Date)} {several other columns omitted} dm_description CHAR(30), {NULL, holiday description or any comments} dm_day_num SMALLINT, {number of elapsed days since begining of year} dm_days_left SMALLINT, (number of remaining days until end of year} dm_plus1_mth DATE, {plus 1 month from lookup date} dm_plus2_mth DATE, {plus 2 months from lookup date} dm_plus3_mth DATE, {plus 3 months from lookup date} dm_fy_begins DATE, {fiscal year begins on for lookup date} dm_fy_ends DATE, {fiscal year ends on for lookup date} dm_qtr_begins DATE, {quarter begins on for lookup date} dm_qtr_ends DATE, {quarter ends on for lookup date} dm_mth_begins DATE, {month begins on for lookup date} dm_mth_ends DATE, {month ends on for lookup date} dm_wk_begins DATE, {week begins on for lookup date} dm_wk_ends DATE, {week ends on for lookup date} {several other columns omitted} ) IN "S:\PAWNSHOP.DBS\DATEMAST"; Is there a better way of doing this or is it a cool method?

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  • Displaying an inverted pyramid of asterisks

    - by onyebuoke
    I help in my for my program. I am required 2 create a inverted pyramid of stars which rows depends on the number of stars the user keys, but I've done it so it does not give an inverted pyramid, it gives a regular pyramid. #include <stdio.h> #include <conio.h> void printchars(int no_star, char space); int getNo_of_rows(void); int main(void) { int numrows, rownum; rownum=0; numrows=getNo_of_rows(); for(rownum=0;rownum<=numrows;rownum++) { printchars(numrows-rownum, ' '); printchars((2*rownum-1), '*'); printf("\n"); } _getche(); return 0; } void printchars(int no_star, char space) { int cnt; for(cnt=0;cnt<no_star;cnt++) { printf("%c",space); } } int getNo_of_rows(void) { int no_star; printf("\n Please enter the number of stars you want to print\n"); scanf("%d",&no_star); while(no_star<1) { printf("\n number incorrect, please enter correct number"); scanf("%d",&no_star); } return no_star; }

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  • C++: Check istream has non-space, non-tab, non-newline characters left without extracting chars

    - by KRao
    I am reading a std::istream and I need to verify without extracting characters that: 1) The stream is not "empty", i.e. that trying to read a char will not result in an fail state (solved by using peek() member function and checking fail state, then setting back to original state) 2) That among the characters left there is at least one which is not a space, a tab or a newline char. The reason for this is, is that I am reading text files containing say one int per line, and sometimes there may be extra spaces / new-lines at the end of the file and this causes issues when I try get back the data from the file to a vector of int. A peek(int n) would probably do what I need but I am stuck with its implementation. I know I could just read istream like: while (myInt << myIstream) {...} //Will fail when I am at the end but the same check would fail for a number of different conditions (say I have something which is not an int on some line) and being able to differentiate between the two reading errors (unexpected thing, nothing left) would help me to write more robust code, as I could write: while (something_left(myIstream)) { myInt << myIstream; if (myStream.fail()) {...} //Horrible things happened } Thank you!

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  • Parsec: backtracking not working

    - by Nathan Sanders
    I am trying to parse F# type syntax. I started writing an [F]Parsec grammar and ran into problems, so I simplified the grammar down to this: type ::= identifier | type -> type identifier ::= [A-Za-z0-9.`]+ After running into problems with FParsec, I switched to Parsec, since I have a full chapter of a book dedicated to explaining it. My code for this grammar is typeP = choice [identP, arrowP] identP = do id <- many1 (digit <|> letter <|> char '.' <|> char '`') -- more complicated code here later return id arrowP = do domain <- typeP string "->" range <- typeP return $ "("++domain++" -> "++range++")" run = parse (do t <- typeP eof return t) "F# type syntax" The problem is that Parsec doesn't backtrack by default, so > run "int" Right "int" -- works! > run "int->int" Left "F# type syntax" unexpected "-" expecting digit, letter, ".", "`" or end of input -- doesn't work! The first thing I tried was to reorder typeP: typeP = choice [arrowP, identP] But this just stack overflows because the grammar is left-recursive--typeP never gets to trying identP because it keeps trying arrowP over and over. Next I tried try in various places, for example: typeP = choice [try identP, arrowP] But nothing I do seems to change the basic behaviours of (1) stack overflow or (2) non-recognition of "-" following an identifier. My mistake is probably obvious to anybody who has successfully written a Parsec grammar. Can somebody point it out?

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  • GTK implementation of MessageBox

    - by Bernard
    I have been trying to implement Win32's MessageBox using GTK. The app using SDL/OpenGL, so this isn't a GTK app. I handle the initialisation (gtk_init) sort of stuff inside the MessageBox function as follows: int MessageBox(HWND hwnd, const char* text, const char* caption, UINT type){ GtkWidget *window = NULL; GtkWidget *dialog = NULL; gtk_init(&gtkArgc, &gtkArgv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(delete_event), NULL); g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy), NULL); // gcallback calls gtk_main_quit() gtk_init_add((GtkFunction)gcallback, NULL); if (type & MB_YESNO) { dialog = gtk_message_dialog_new(GTK_WINDOW(window), GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, text); } else { dialog = gtk_message_dialog_new(GTK_WINDOW(window), GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_INFO, GTK_BUTTONS_OK, text); } gtk_window_set_title(GTK_WINDOW(dialog), caption); gint result = gtk_dialog_run(GTK_DIALOG(dialog)); gtk_main(); gtk_widget_destroy(dialog); if (type & MB_YESNO) { switch (result) { default: case GTK_RESPONSE_DELETE_EVENT: case GTK_RESPONSE_NO: return IDNO; break; case GTK_RESPONSE_YES: return IDYES; break; } } return IDOK;} Now, I am by no means an experienced GTK programmer, and I realise that I'm probably doing something(s) horribly wrong. However, my problem is that the last dialog popped up with this function stays around until the process exits. Any ideas?

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  • What's the strangest corner case you've seen in C# or .NET?

    - by Jon Skeet
    I collect a few corner cases and brain teasers and would always like to hear more. The page only really covers C# language bits and bobs, but I also find core .NET things interesting too. For example, here's one which isn't on the page, but which I find incredible: string x = new string(new char[0]); string y = new string(new char[0]); Console.WriteLine(object.ReferenceEquals(x, y)); I'd expect that to print False - after all, "new" (with a reference type) always creates a new object, doesn't it? The specs for both C# and the CLI indicate that it should. Well, not in this particular case. It prints True, and has done on every version of the framework I've tested it with. (I haven't tried it on Mono, admittedly...) Just to be clear, this is only an example of the kind of thing I'm looking for - I wasn't particularly looking for discussion/explanation of this oddity. (It's not the same as normal string interning; in particular, string interning doesn't normally happen when a constructor is called.) I was really asking for similar odd behaviour. Any other gems lurking out there?

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  • Using datetime float representation as primary key

    - by devanalyst
    From my experience I have learn that using an surrogate INT data type column as primary key esp. an IDENTITY key column offers better performance than using GUID or char/varchar data type column as primary key. I try to use IDENTITY key as primary key wherever possible. But recently I came across a schema where the tables were horizontally partitioned and were managed via a Partitioned view. So the tables could not have an IDENTITY column since that would make the Partitioned View non updatable. One work around for this was to create a dummy 'keygenerator' table with an identity column to generate IDs for primary key. But this would mean having a 'keygenerator' table for each of the Partitioned View. My next thought was to use float as a primary key. The reason is the following key algorithm that I devised DECLARE @KEY FLOAT SET @KEY = CONVERT(FLOAT,GETDATE())/100000.0 SET @KEY = @EMP_ID + @KEY Heres how it works. CONVERT(FLOAT,GETDATE()) gives float representation of current datetime since internally all datetime are represented by SQL as a float value. CONVERT(FLOAT,GETDATE())/100000.0 converts the float representation into complete decimal value i.e. all digits are pushed to right side of ".". @KEY = @EMP_ID + @KEY adds the Employee ID which is an integer to this decimal value. The logic is that the Employee ID is guaranteed to be unique across sessions since an employee cannot connect to an application more than once at the same time. And for the same employee each time a key will be generated the current datetime will be unique. In all an unique key across all employee sessions and across time. So for Emp Ids 11 and 12, I have key values like 12.40046693321566357, 11.40046693542361111 But my concern whether float data type as primary key offer benefits compared to choosing GUID or char/varchar as primary keys. Also important thing is because of partitioning the float column is going to be part of a composite key.

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