CodeProject Latest postings for C / C++ / MFC

don't use the drive into Ring0

SetHookCurrent — Thu, 23 May 2013 13:32:00 GMT

Can anyone tell me how to drive is not used to enter Ring0?

How to change bitmap dynamically

econy — Thu, 23 May 2013 12:52:00 GMT

Hi, I want to change the background bitmap of a dialog dynamically, for example, press button1, the background turn to image1, press button2, the background turn to image2.

I try to use a bool variable,like:
if (btnimg == 0) dlg.loadbitmap(image1);
else dlg.loadbitmap(image2);

it not work well.

CEdit control

sarfaraznawaz — Thu, 23 May 2013 06:12:00 GMT

how to set char limit so that it should not exceed the 11 char .
after exceeding 11 char does not allow to press the key.
any example will helpful

Using MagSetImageScalingCallback

thanh_bkhn — Thu, 23 May 2013 01:55:00 GMT

Hi everyone,
I need to use MagSetImageScalingCallback to capture the desktop screen. But I cannot find out how to call it correctly. I know it's odd, but do you have any idea about this deprecated function?

any solution for WSAETIMEDOUT for CAsynSocket::OnConnect

ForNow — Wed, 22 May 2013 16:36:00 GMT

Hi

When I first got my laptop last august my application that I was developing (at least the TCP/IP code)
was running fine about now my laptop runs a lot slower I tried to clean it up but it still doesn't
run nearly as fast it did when I bought it

towards that end on My CAsyncSocket::OnConnect overridble I am getting the following nErrorCode

WSAETIMEDOUT

I am wondering what is the best approach to this is modifying a registry key for the TCP/IP time out value (I am running Windows 7)

Maybe start clean re-install of Windows

Any suggestion appreciated

Thanks

source code sudoku c

Member 10069426 — Wed, 22 May 2013 13:54:00 GMT

does anyone have the source code of sudoku?, but that requires us to input numbers and and using C

C++ Syntax failure ?

Engeltje — Wed, 22 May 2013 13:40:00 GMT

Can anyone explain me why the following C++ snippet does compile and not end up in a compiler error ?

int main()
{
  double d;
  d = 0,2;      // WHY IS THIS NOT A COMPILER ERROR ?

  return 0;
}

I would expect the double assignment should be

  double d;
  d = 0.2;

Because I couldn't believe it, I tried VisualStudio 2010, -2005 AND -6, all three compiled with 0 errors, 0 warnings...

error handling in c++ dll

venkatesh52867 — Wed, 22 May 2013 05:39:00 GMT

Hi,
I have one function which is return string array in my C++ dll .from this function how can return error .please help me .
Thanks

MFC SetTimer() question

econy — Tue, 21 May 2013 17:13:00 GMT

In a dialog, WM_PAINT message handler, I set a timer.

void CXYZDlg::OnPaint()
{... SetTimer(12, 2500, NULL);}

in the OnTimer(),I found I have to set it again, then it goes into
the breakpoint in OnTimer() repeatedly. otherwise, it only goes into the OnTimer() function once.

<pre lang="c++">void CXYZ::OnTimer(UINT_PTR nIDEvent)
{
if (g_Scroll == 1) {
		if ( sc< 16 ){
			BuzzerOnce(1);
			SC++;
		}
		else
			sc = 1;
	}
 
	...
	SetTimer(1361, 2500, NULL);  //Have to set this, other wise OnTimer only runs once. I am confused with this statement.
	CDialog::OnTimer(nIDEvent);
}

Compressing Data for Transmission - Compression API Windows 7

Vasudevan S — Tue, 21 May 2013 17:00:00 GMT

I am building an application that needs to compress data before being sent via socket. Performance is very very critical and I want to make use of native functions i.e. no interop calls into .net libraries. I am building it as a C++ application.

I did find Compression API that will take an input and provide a compressed output. PLEASE BEAR THE FACT THAT I AM NOT USING ANY FILES (DISK FILES). Instead I am just dealing with raw stream.

But this Compression API is available only from Windows 8 onwards and Windows Server 2012. How do I go about finding a solution if I were to do this on Windows 7 and and a server that is say 2008 or 2003

Hickups:

Cabinet API does not help as it always does it thru files?

Explored the option of CMemFile and see if I can break the ice but the m_handle is of no use nor will there be a need to open or close files as I am just dealing with raw bytes.

Splitter view using template

john5632 — Tue, 21 May 2013 15:26:00 GMT

Hi,

I am trying template for splitter view but getting error in IMPLEMENT_DYNCREATE_T.
I am using VS2008. Plz help

PCI Printer Ports?

macklinbob — Tue, 21 May 2013 15:19:00 GMT

New motherboards do not have built in printer ports. There are many devices that used these ports. I have several chip programming adapters.

I would like to be able to read and write the LPT ports directly. Not using the Windows print spooler.

Does anyone know where to get the port information for PCI parallel port?

Bob Macklin
Seattle, Wa

'System' : is not a class or namespace name

bugwee — Tue, 21 May 2013 14:49:00 GMT

Hi guys,

i'm creating an app in c++ that uses the FileSystemEventArgs.

In my code i added the namespace System::IO;

My problem is, the System Namespace will work if in my configuration

Common Language Runtime Support = /clr

but it produces an error if

Common Language Runtime Support = No CLR Support

Need you ideas guys what to do. I need my app to be configured with No CLR Support.

Thanks

Disabling cut,copy,paste,rename and delete operation

sarfaraznawaz — Tue, 21 May 2013 07:42:00 GMT

hello,
Is there way to disable Cut,Copy,Paste,Rename and Delete operation for a particular file with (.extension)
in windows ...

please Reply me ....

multi platform applications

vr999999999 — Tue, 21 May 2013 07:23:00 GMT

Is it possible to develop a multi platform applications in vc++. If yes then what i have to do for that.

Handle enter key in Edit control MFC

Member 10036414 — Tue, 21 May 2013 07:18:00 GMT

I was asked to build a MFC appliation, which will execute a window Command line when you type a window Command line & press "Eter".
But i don't know how to handle Enter key event in multiline Edit control.

Please help me! Thanks so much!

how to hook WM_CLOSE message on all process

Member 10066523 — Tue, 21 May 2013 06:34:00 GMT

can you give me a project of VS 2010 C++ to hook WM_CLOSE message on all process?
Thank you!
~Peter

Write Text on child window - SDI application

tagopi — Tue, 21 May 2013 05:43:00 GMT

Hello Everybody,

I have created one SDI Application with one dialog - having some controls. In that, if I click a button, I want to show a child window and with the following code, I am getting that fine.

CMainFrame *pMainFrm = ((CMainFrame*)(AfxGetApp()->m_pMainWnd)); 
	CFrameWnd *pFrame = new CFrameWnd;
	RECT rect;
	pFrame->Create(NULL,_T("Solution"), WS_OVERLAPPEDWINDOW ,rect,this);
	pFrame->ModifyStyle(WS_CAPTION + WS_OVERLAPPEDWINDOW , WS_BORDER,SWP_NOMOVE +SWP_NOZORDER );
 
	pFrame->InitialUpdateFrame(pMainFrm->GetActiveDocument(),TRUE);
	pFrame->SetWindowPos(&CWnd::wndTopMost,100,200,1000,400,SWP_SHOWWINDOW);
	pFrame->ActivateFrame(SW_SHOWNORMAL);

Now, I would like to write some text on that child window. Any suggestions? I tried in google also.

Thanks in advance,
A. Gopinath.

VC++ Crashing?

macklinbob — Mon, 20 May 2013 19:55:00 GMT

I have VisualC++ Ver 5. I have been using it for close to 20 years. I know it's old but so am I.

My problem is that my version of VC++ crashes frequently when used on a WinXP computer.

But on a Win2K computer it runs for hours before crashing.

Is there something I should know about running VC++ on a WinXP computer?

Bob Macklin
Seattle, Wa.

Video output gets corrupted. Displays Grey colour instead of actual Video colors.?

mbatra31 — Mon, 20 May 2013 12:06:00 GMT

Hi,

I am working on a project in which I am using DirectShow for Capturing and Displaying Videos.
It works fine for Windows XP and Windows 7, but when I try to play the same video on Windows 8, its output gets corrupted. It doesn't display the actual videos colors, instead the color turns into Grey for the whole video. I tried to update DirectShow for Windows 8, checked in the code also, but all in vein....Still the same issue.
I am trying to play a file of .wmv format. Issue persists for other formats also.

Do I need any missing codec in Windows 8 or any other solution for this problem.?

How it could be possible that a video displays fine for Windows XP, and 7 but not for Windows 8.

Anybody have any idea regarding this.?

Any help will be appreciated.

Regards,
Mbatra