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• clear html webpage?

  - by noname

  i am currently developing a crawler that crawls all links on the web and displays them in the web browser (and saving it of course). but after some hours there will be a huge list displayed on the web browser and i want to only display lets say 1000 links at the same time. then i clear the html and display another 1000 links. this is also good for the RAM or it will eat up all memory. how do i clear the web browser screen? EDIT: i have seen some scripts using some flush buffer functions. has this anything to do with my case?

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• SQLite Transaction fills a table BEFORE the transaction is commited

  - by user1500403

  Halo I have a code that creates a datatable (in memory) from a select SQL statement. However I realised that this datatable is filling during the procedure rather as a result of the transaction comit statment, it does the job but its slow. WHat amI doing wrong ? Inalready.Clear() 'clears a dictionary Using connection As New SQLite.SQLiteConnection(conectionString) connection.Open() Dim sqliteTran As SQLite.SQLiteTransaction = connection.BeginTransaction() Try oMainQueryR = "SELECT * FROM detailstable Where name= :name AND Breed= :Breed" Dim cmdSQLite As SQLite.SQLiteCommand = connection.CreateCommand() Dim oAdapter As New SQLite.SQLiteDataAdapter(cmdSQLite) With cmdSQLite .CommandType = CommandType.Text .CommandText = oMainQueryR .Parameters.Add(":name", SqlDbType.VarChar) .Parameters.Add(":Breed", SqlDbType.VarChar) End With Dim c As Long = 0 For Each row As DataRow In list.Rows 'this is the list with 500 names If Inalready.ContainsKey(row.Item("name")) Then Else c = c + 1 Form1.TextBox1.Text = " Fill .... " & c Application.DoEvents() Inalready.Add(row.Item("name"), row.Item("Breed")) cmdSQLite.Parameters(":name").Value = row.Item("name") cmdSQLite.Parameters(":Breed").Value = row.Item("Breed") oAdapter.Fill(newdetailstable) End If Next oAdapter.FillSchema(newdetailstable, SchemaType.Source) Dim z = newdetailstable.Rows.Count 'At this point the newdetailstable is already filled up and I havent even comited the transaction ' sqliteTran.Commit() Catch ex As Exception End Try End Using

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• Change connection on the fly

  - by aron

  Hello, I have a SQL server with 50 databases. Each one has the exact same schema. I used the awesome Subsonic 2.2 create the DAL based on one of them. I need to loop though a list of database names and connect to each one and perform an update one at a time. If there a way to alter how subsonic uses the connection string. I believe I would need to store the connection string in memory that way it can keep changing. Is this possible? I tried doing a ConfigurationManager.ConnectionStrings["theConnStrName"].ConnectionString = updated-connection-string-here; .. but that did not work thanks!

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• Why is autorelease especially dangerous/expensive for iPhone applications?

  - by e.James

  I'm looking for a primary source (or a really good explanation) to back up the claim that the use of autorelease is dangerous or overly expensive when writing software for the iPhone. Several developers make this claim, and I have even heard that Apple does not recommend it, but I have not been able to turn up any concrete sources to back it up. SO references: autorelease-iphone Why does this create a memory leak (iPhone)? Note: I can see, from a conceptual point of view, that autorelease is slightly more expensive than a simple call to release, but I don't think that small penalty is enough to make Apple recommend against it. What's the real story?

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• Changes to the User Permissions Not saving

  - by anru

  I am use drupal 6. it seems like permission page can not save too many settings. I have try to save permission setting, but it is just not saved into DB. I have found out this is due to "too many fields". (use content permission module). if i uncheck some fields, and then checking lesser fields, permission will be saved. for example, if I am unchecking 2 check boxes, then checking one check box, permission will be saved. does any one know which function the permission page used to insert result into db? my php memory limit is 256M.

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• Is there any kind of standard for 8086 multiprocessing?

  - by Earlz

  Back when I made an 8086 emulator I noticed that there was the LOCK prefix intended for synchonization in a multiprocessor environment. Yet the only multitasking I know of for the x86 arch. involves use of the APIC which didn't come around until either the Pentiums or 486s. Was there any kind of standard for 8086 multitasking or was it done by some manufacturer specific extensions to the instruction set and/or special ports? By standard, I mean things like: How do you separate the 2 processors if they both use the same memory? This is impossible without some kind of way to make each processor execute a different piece of code. (or cause an interrupt on only one processor)

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• Is there a way to write System.Drawing.Graphics to PDF from C#?

  - by Brett Ryan

  I have a whole bunch of 2D graphics that is being used for both rendering controls on screen and used to print, it's pretty custom graphics that couldn't be done by any 3rd party reporting tools or off the shelf controls. The program can generate PDF files of the printed content but when I wrote it I cheated and just print the Graphics object to an in memory image and then embed that into the PDF page. Since the users are emailing the documents they're finding they are too large. I've started writing the PDF from scratch using iText, however is there a way to get System.Drawing.Graphics content directly into PDF? The way iText works and Graphics works is completely different.

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• How to find grid array in the browser ExtJs

  - by insanity

  Suppose if i have created a grid store like this var store = Ext.create('Ext.data.ArrayStore', { fields:['id','title', 'director', 'released', 'genre','tagline', 'price', 'available'], data: [ [ 1, "Office Space", "Mike Judge", "1999-02-19", 1, "Work Sucks", "19.95", 1 ], [ 3, "Super Troopers", "Jay Chandrasekhar", "2002-02-15", 1, "Altered State Police", "14.95", 1 ] ] }); when i run it on browser i could not see anything because it has already been saved in the browser's memory , we need to display it to the the grid to see those data. if i am editing the grid in the browser using editors plugin, so how can i see the changes made to the grid store? how to see it ?

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• What is a .NET managed module?

  - by Abhijeet Patel

  I know it's a Windows PE32, but I also know that the unit of deployment in .NET is an assembly which in turn has a manifest and can be made up of multiple managed modules. My questions are : 1) How would you create multiple managed modules when building a project such as a class lib or a console app etc. 2) Is there a way to specify this to the compiler(via the project properties for example) to partition your source code files into multiple managed modules. If so what is the benefit of doing so? 3)Can managed modules span assemblies? 4)Are separate file created on disk when the source code is compiled or are these created in memory and directly embedded in an assembly?

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• Why might different computers calculate different arithmetic results in VB.NET?

  - by Eyal

  I have some software written in VB.NET that performs a lot of calculations, mostly extracting jpegs to bitmaps and computing calculations on the pixels like convolutions and matrix multiplication. Different computers are giving me different results despite having identical inputs. What might be the reason? Edit: I can't provide the algorithm because it's proprietary but I can provide all the relevant operations: ULong \ ULong (Turuncating division) Bitmap.Load("filename.bmp') (Load a bitmap into memory) Bitmap.GetPixel(Integer, Integer) (Get a pixel's brightness) Double + Double Double * Double Math.Sqrt(Double) Math.PI Math.Cos(Double) ULong - ULong ULong * ULong ULong << ULong List.OrderBy(Of Double)(Func) Hmm... Is it possible that OrderBy is using a non-stable QuickSort and that QuickSort is using a random pivot? Edit: Just tested, nope. The sort is stable.

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• Difference between static const char* and const char*.

  - by Will MacDonagh

  Could someone please explain the difference in how the 2 snippets of code are handled below? They definitely compile to different assembly code, but I'm trying to understand how the code might act differently. I understand that string literals are thrown into read only memory and are effectively static, but how does that differ from the explicit static below? struct Obj1 { void Foo() { const char* str( "hello" ); } }; and struct Obj2 { void Bar() { static const char* str( "hello" ); } };

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• How should I deal with persisting an Android WebView if my activity gets destroyed while showing ano

  - by Shaun Crampton

  Hi, I'm building an Android application that's based around an enhanced WebView (based on PhoneGap). I've enhanced the WebView so that from JavaScript running inside you can invoke the native contact picker to choose a phone number (which may be supplied by Facebook for example). The problem I have is that the native contact picker runs in an activity in another process and the Android docs say that while another activity is open my activity may get destroyed due to memory constraints. I haven't actually seen this happen in my application but if it did then I'm guessing my WebView's state would be destroyed and the code that was waiting for the picked contact would be terminated. It seems a bit crazy that the activity requesting a contact could be destroyed while the contact picker is open. Does anyone know if that does indeed happen? Is there a way to persist the state of the WebView if it does? Thanks, -Shaun

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• Create a Stream without having a physical file to create from.

  - by jhorton

  I'm needing to create a zip file containing documents that exist on the server. I am using the .Net Package class to do so, and to create a new Package (which is the zip file) I have to have either a path to a physical file or a stream. I am trying to not create an actual file that would be the zip file, instead just create a stream that would exist in memory or something. My question is how do you instantiate a new Stream (i.e. FileStream, MemoryStream, etc) without having a physical file to instantiate from.

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• [PHP] Using cURL to download large XML files

  - by ndg

  I'm working with PHP and need to parse a number of fairly large XML files (50-75MB uncompressed). The issue, however, is that these XML files are stored remotely and will need to be downloaded before I can parse them. Having thought about the issue, I think using a system() call in PHP in order to initiate a cURL transfer is probably the best way to avoid timeouts and PHP memory limits. Has anyone done anything like this before? Specifically, what should I pass to cURL to download the remote file and ensure it's saved to a local folder of my choice?

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• storing an integral value in a pointer variable while declaration

  - by benjamin button

  int main() { int *d=0; printf("%d\n",*d); return 0; } this works fine. >cc legal.c > ./a.out 0 if i change the statement int *d=0; to int *d=1; i see the error. cc: "legal.c", line 6: error 1522: Cannot initialize a pointer with an integer constant other than zero. so its obvious that it will allow only zero.i want to know what happens inside the memory when we do this int *d=0 which is making it valid syntax. I am just asking this out of curiosity!

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• Generating a Grid of NSTextField Objects From NSDictionary Items

  - by SteveStifler

  I'm trying to create an vocabulary study application using Obj-C and the Cocoa frameworks. I have about two week's experience in both areas and have reached an edge of my current knowledge. Here's where I'm stuck. When I press a checkbox, a corresponding plist is loaded into memory as an NSDictionary. I want to generate a "Label: Textfield" pair for each key:value pair, where the Label is the key. When the text typed into the Textfield matches the key's value, I want the Label's text to turn green. So how would I generate this grid, and once generated, how would I make the text green upon correct input? Thanks!

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• Disallow private constructor invocation in friend function

  - by user2907032

  Is there any way to not allow private construction in friend function, In case we do have private constructor with friend function in our class. Only Static method should be responsible for object creation and other than this compiler should flash error message #include <iostream> #include <memory> using namespace std; class a { public: void see () { cout<<"Motimaa"; } static a& getinstance() { static a instance; return instance; } private: a() {}; friend void access(); }; void access () { a obj; obj.see();//still friend function can access } int main() { a::getinstance().see(); access(); return 1; }

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• CPU/GPU Monitering. (Tempature, current speed, etc) in C#

  - by Tommy

  Im looking for a way to moniter system statistics, here are my main points of interest: CPU Tempature CPU speed, (Cycles per second) CPU Load (Idle percent) GPU Tempature Some other points of interest: Memory useage Network Load (Traffic Up/Down) My ultimate goal is to write an application that can be used for easily running in the backround, and allow setting many events fr certain actions, for instance When processer temp gets to 56C -> Do _Blank_ etc. So this leaves me two main points. Is there a framework already out there for this sort of thing? If No to #1, How can i go about doing this?

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• How does multiple implementing multiple COM interfaces work in C++?

  - by Martin

  I am trying to understand this example code regarding Browser Helper Objects. Inside, the author implements a single class which exposes multiple interfaces (IObjectWithSite, IDispatch). His QueryInterface function performs the following: if(riid == IID_IUnknown) *ppv = static_cast<BHO*>(this); else if(riid == IID_IObjectWithSite) *ppv = static_cast<IObjectWithSite*>(this); else if (riid == IID_IDispatch) *ppv = static_cast<IDispatch*>(this); I have learned that from a C perspective, interface pointers are just pointers to VTables. So I take it to mean that C++ is capable of returning the VTable of any implemented interface using static_cast. Does this mean that a class constructed in this way has a bunch of VTables in memory (IObjectWithSite, IDispatch, etc)? What does C++ do with the name collisions on the different interfaces (they each have a QueryInterface, AddRef and Release function), can I implement different methods for each of these?

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• How can I ensure that a Java object (containing cryptographic material) is zeroized?

  - by Jeremy Powell

  My concern is that cryptographic keys and secrets that are managed by the garbage collector may be copied and moved around in memory without zeroization. As a possible solution, is it enough to: public class Key { private char[] key; // ... protected void finalize() throws Throwable { try { for(int k = 0; k < key.length; k++) { key[k] = '\0'; } } catch (Exception e) { //... } finally { super.finalize(); } } // ... }

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• Can django lazy-load fields in a model?

  - by Leopd

  One of my django models has a large TextField which I often don't need to use. Is there a way to tell django to "lazy-load" this field? i.e. not to bother pulling it from the database unless I explicitly ask for it. I'm wasting a lot of memory and bandwidth pulling this TextField into python every time I refer to these objects. The alternative would be to create a new table for the contents of this field, but I'd rather avoid that complexity if I can.

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• What are the pro and cons of having localization files vs hard coded variables in source code?

  - by corgrath

  Definitions: Files: Having the localization phrases stored in a physical file that gets read at application start-up and the phrases are stored in the memory to be accessed via util-methods. The phrases are stored in key-value format. One file per language. Variables: The localization texts are stored as hard code variables in the application's source code. The variables are complex data types and depending on the current language, the appropriate phrase is returned. Background: The application is a Java Servlet and the developers use Eclipse as their primary IDE. Some brief pro and cons: Since Eclipse is use, tracking and finding unused localizations are easier when they are saved as variables, compared to having them in a file. However the application's source code becomes bigger and bloated. What are the pro and cons of having localization text in files versus hard coded varibles in source code? What do you do and why?

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• Why does this script work in the current directory but fail when placed in the path?

  - by kiloseven

  I wish to replace my failing memory with a very small shell script. #!/bin/sh if ! [ –a $1.sav ]; then mv $1 $1.sav cp $1.sav $1 fi nano $1 is intended to save the original version of a script. If the original has been preserved before, it skips the move-and-copy-back (and I use move-and-copy-back to preserve the original timestamp). This works as intended if, after I make it executable with chmod I launch it from within the directory where I am editing, e.g. with ./safe.sh filename However, when I move it into /usr/bin and then I try to run it in a different directory (without the leading ./) it fails with: *-bash: /usr/bin/safe.sh: /bin/sh: bad interpreter: Text file busy* My question is, when I move this script into the path (verified by echo $PATH) why does it then fail? D'oh? Inquiring minds want to know how to make this work.

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• python class attribute

  - by chnet

  Hi, i have a question about class attribute in python. class base : def __init__ (self): pass derived_val = 1 t1 = base() t2 = base () t2.derived_val +=1 t2.__class__.derived_val +=2 print t2.derived_val # its value is 2 print t2.__class__.derived_val # its value is 3 The results are different. I also use id() function to find t2.derived_val and t2.class.derived_val have different memory address. My problem is derived_val is class attribute. Why it is different in above example? Is it because the instance of class copy its own derived_val beside the class attribute?

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• static library vs dynamic libraries

  - by user295030

  Can someone please explain in easy terms what is static library linking vs dynamic library linking other one has a larger memory map than the other or that the static library is used to compile/link with the program that will use it versus being loaded at runtime? I also need to create a static library of a program that I made in vs2008 and give one function interface to access the library. one of the requirements reads as such " * API should be in the form of static library. company xxx will link the library into a third party application to prevent any possible exposure of the code(dll)" how can they say both static and dll at the same time. I have never works with static library before. So please any help would be nice.

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