C / C++ / MFC

ritz12345-Mar-08 18:48

ritz1234

5-Mar-08 18:48

Hi, Thanks for the reply,

Actually the project is on motion detection by the webcam.

The OnTimer function creates a thread that save the current picture frame

on the disk.

I am using this timer in Application class derieved from CWinApp

does this creating a problem for me?

ritz1234

Maxwell Chen5-Mar-08 19:43

Maxwell Chen

5-Mar-08 19:43

1. Is the timer successfully created?

2. Do you filter the timer IDs?

3. Does the execution enter the OnTimer body?

4. Could you add some OutputDebugString or write log to file to approach the last line it executes right before crash?

Usually this kind of crash relates to invalid handles or pointers.

Maxwell Chen

cagespear5-Mar-08 20:10

cagespear

5-Mar-08 20:10

Please make sure that you do not have any un-initialized variables, they can act evil in Release mode.

Also, do you have a crash dump which you can analyse through any debugger and see which memory segment is throwing the error ?

Maxwell Chen5-Mar-08 20:16

Maxwell Chen

5-Mar-08 20:16

Hi cagespear,

You should reply to OP's posts, otherwise he won't recieve a notification email. Big Grin | :-D

Maxwell Chen

Rajesh R Subramanian5-Mar-08 20:21

Rajesh R Subramanian

5-Mar-08 20:21

No, he was giving you some suggestions. Laugh | :laugh:

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Maxwell Chen5-Mar-08 22:25

Maxwell Chen

5-Mar-08 22:25

Rajesh R Subramanian wrote:
No, he was giving you some suggestions.

Maxwell Chen

cagespear5-Mar-08 22:05

cagespear

5-Mar-08 22:05

Thanks for the tip Maxwell Smile | :)

Convert dialog based application to SDI/MDI architecture.

Roger Stoltz5-Mar-08 21:53

Roger Stoltz

5-Mar-08 21:53

Have a look here:
http://www.flounder.com/debug_release.htm[^]

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

lavate malllik5-Mar-08 17:14

lavate malllik

5-Mar-08 17:14

I have a dialog based application that I would like to convert to a

SDI/MDI architecture.

Please help me out to resolve the above problem.

Thanks in advance.

Mallikarjun

Re: Convert dialog based application to SDI/MDI architecture.

cagespear5-Mar-08 22:01

cagespear

5-Mar-08 22:01

You can do that manually by converting dialog to doc-view based SDI/MDI app by creating new Doc,View,Frame files and integrating the logic in there and doing lots of other things. But that would be very cryptic because there are very meticulous things to be done in order to achieve it.(e.g. manually editing RC to create frames, menu, toolbar and all).

I think instead of tweaking same app from dlg based to SDI/MSI, it'd be better if you create a fresh MDI/SDI app and then port the functionality one by one from your dialog based app to the SDI/MDI app.

Regards
Cage

Re: Convert dialog based application to SDI/MDI architecture.

led mike6-Mar-08 7:33

led mike

6-Mar-08 7:33

lavate malllik wrote:
Please help me out to resolve the above problem.

Well if you implemented any sort of Design using Best Practices and Patterns it should be very simple rote work to replace the UI with another. Of course you have to actually develop the UI which may not be simple at all.

led mike

Zoom and text size

includeh105-Mar-08 16:53

includeh10

5-Mar-08 16:53

In my app, I applied SetMapMode() to CView's DC for zoom in-out purpose, drawing (such as LineTo()) and bitmap (such as StretchBlt()) are changed properly with zoom's change.

Problem is that text size (such as by TextOut()) keeps the same even zoom is changed.

Do you know how to change text size automatically when zoom is changed? -- do not use SetFont() or similar functions to change font size.

thx

Re: Zoom and text size

Stephen Hewitt5-Mar-08 17:03

Stephen Hewitt

5-Mar-08 17:03

On Windows NT and greater you can use the SetWorldTransform[^] API.

Steve

Re: Zoom and text size

includeh105-Mar-08 20:23

includeh10

5-Mar-08 20:23

As I tested, the function can not change text size.

CreateProcess to launch command prompt

Imtiaz Murtaza5-Mar-08 15:54

Imtiaz Murtaza

5-Mar-08 15:54

Friends,
I want to launch command prompt window from my application running on Windows Vista. For this purpose i am using CreateProcess. What i want is that command prompt window shoul be launched with Administrative priviliges. Please tell me how can i do so ?

Imtiaz

Mark Salsbery5-Mar-08 16:35

Mark Salsbery

5-Mar-08 16:35

I'm not sure about CreateProcess().

But maybe this:

::ShellExecute(NULL, _T("runas"), _T("c:\\Windows\\System32\\cmd.exe"), _T(""), _T(""), SW_SHOWNORMAL);

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Stephen Hewitt5-Mar-08 16:57

Stephen Hewitt

5-Mar-08 16:57

Not counting the run as administrator part, I'd do it like this:

// Win32.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include <windows.h>
#include <tchar.h>
#include <shellapi.h>
#include <malloc.h>
#pragma comment(lib, "shell32.lib")
 
int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
	DWORD size = GetEnvironmentVariable(_T("ComSpec"), NULL, 0);
	LPTSTR pPath = static_cast<LPTSTR>(_alloca(size*sizeof(TCHAR)));
	GetEnvironmentVariable(_T("ComSpec"), pPath, size);
 
	ShellExecute(NULL, NULL, pPath, NULL, NULL, SW_SHOWNORMAL);

	return 0;
}

This code makes no assumptions about the location of the windows folder or the location and name of the command interpreter.

Steve

modified on Wednesday, March 5, 2008 10:08 PM

Mark Salsbery5-Mar-08 17:07

Mark Salsbery

5-Mar-08 17:07

Sweet! Thanks for that!!

Just add the runas verb and it will prompt for elevation...

ShellExecute(NULL, _T("runas"), pPath, NULL, NULL, SW_SHOWNORMAL);

Filed for future reference, thanks!
Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Stephen Hewitt5-Mar-08 16:59

Stephen Hewitt

5-Mar-08 16:59

In addition to Mark's reply, see here[^].

Steve

Rajkumar R5-Mar-08 18:12

Rajkumar R

5-Mar-08 18:12

Imtiaz Murtaza wrote:
For this purpose i am using CreateProcess. What i want is that command prompt window shoul be launched with Administrative priviliges

have a look at CreateProcessWithLogon, CreateProcessWithToken, CreateProcessAsUser.

CWinthread

LCI5-Mar-08 13:35

5-Mar-08 13:35

I would really like to use CWinThread class.
I have an odd situation where i am in a dll and would like to use a thread. For come reason CWinThread is not accessible here.
When i try to inclde afxwin.h before my stdafx.h

I would not compile on :
CWinThread *pThread;

I get the following errors
error C2143: syntax error: missing ';' before'*'
error C2501: 'CWinThread':missing storage-class or type specifiers.

Any idea what is going on here?

LCI5-Mar-08 13:38

5-Mar-08 13:38

Maybe there is something in my 'properties' that i am missing ?? Smile | :)

Mark Salsbery5-Mar-08 14:40

Mark Salsbery

5-Mar-08 14:40

Why not include afxwin.h IN stdafx.h?

Build a quick temporary MFC project with the project wizard and you'll see a working arrangement
for the MFC header files.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

LCI6-Mar-08 2:20

6-Mar-08 2:20

Have the same problem if i include afxwin.h IN stdafx.h

Could it be that my .dll is a win32 and cannot run MFC classes?

LCI6-Mar-08 2:33