C / C++ / MFC

Mark Salsbery5-Nov-07 12:31

5-Nov-07 12:31

It's up to the application to return whatever value is appropriate for
the application.

It's long been conventional to use 0 as a success return value (since it worked
well with DOS batch files, I suppose).

Mark

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

Llasus5-Nov-07 12:43

5-Nov-07 12:43

Yes that was what I was thinking of since in most of the applications I have made, it rarely returns a 0. But I've noticed though that on an application it always returns the same exit code. This maybe a wild goosechase with the exit codes. MSDN doesn't seem to have a proper documentation for them or maybe I'm not poking in the right places. If you do have links about them please give it to me. Smile | :)

Anyway, thank you for your help! Gave me confidence on my knowledge about exit codes.

Mark Salsbery5-Nov-07 12:47

5-Nov-07 12:47

Llasus wrote:
But I've noticed though that on an application it always returns the same exit code.

Is it your application or 3rd party?

If it's yours, you should have control over what's returned Smile | :)

Mark

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

Llasus5-Nov-07 12:48

5-Nov-07 12:48

Nope, I've created them. How do I control the value it returns?

Mark Salsbery5-Nov-07 12:56

5-Nov-07 12:56

It depends on what type of application and whether or not it uses the CRT
and/or MFC or other libraries.

Could be main(), WinMain(), CWinApp::ExitInstance(), the exit code in a
WM_QUIT message, etc. Somewhere, the app is exiting Smile | :)

Mark

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

Llasus5-Nov-07 13:04

5-Nov-07 13:04

I see, I'll continue researching on MSDN docs about exit codes and see how it changes depending on my application. If you have links about exit codes though please give it to me. Again, thank you very much for your help!!! Big Grin | :-D

Mark Salsbery5-Nov-07 13:32

5-Nov-07 13:32

These are probably the most common places a return value is returned from...

main: Program Startup[^]   (Applies to all C/C++ apps)
WinMain Function[^]         (Applies to Win32 apps)
CWinApp::ExitInstance[^] (Applies to MFC apps)
CWinApp::Run[^]             (Applies to MFC apps - if you've overriden Run(), the returned value can override ExitInstance() return value)
PostQuitMessage Function[^] (Applies to all Windows applications)

Note that many of these propogate up the list depending on the type of application.
For example, in an MFC app, MFC has its own WinMain() and it's all handled by the
CRT main() so you only have to worry about the return value from ExitInstance() or in
rare circumstances, Run().

Mark

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

Llasus5-Nov-07 13:47

5-Nov-07 13:47

Hi Mark. Thanks for your continuous help. I did some experiment and it actually worked by returning exit code 0. Though what I did may not be the right step. Since I don't really edit the ExitInstance() (as I have never used it before) I tried to check on my OnClose() function. By switching the original CDialog::OnClose() with PostQuitMessage(0), it actually returned the proper exit code of 0. But it may not be right since I forced it to return 0. Could you please check on this one?

void CApplicationDlg::OnClose() <br />
{<br />
	SomeClass.CleanUp();<br />
<br />
	CWnd*   ThisDlg;<br />
	ThisDlg= GetDlgItem(IDC_LEFTPICBOX);<br />
	ThisDlg->ReleaseDC(&GlobalLeftPicDC);<br />
	GlobalLeftPicDC.DeleteDC();<br />
	ThisDlg= GetDlgItem(IDC_RIGHTPICBOX);<br />
	ThisDlg->ReleaseDC(&GlobalRightPicDC);<br />
	GlobalRightPicDC.DeleteDC();<br />
<br />
	CDialog::OnClose(); //Switch this with PostQuitMessage(0);<br />
}

I may be somehow going away from my problem here but I just want to prove that exit codes doesn't really have an effect on my program. Again, thank you for your help!

David Crow5-Nov-07 16:25

David Crow

5-Nov-07 16:25

Llasus wrote:
Program '[2788] Application.exe: Native' has exited with Code 2 (0x2).

If it's a dialog-based application, are you dismissing the dialog via OK or Cancel?

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Llasus5-Nov-07 16:50

5-Nov-07 16:50

No, I actually removed those two buttons that come as default when creating a new dialog.

Llasus5-Nov-07 17:10

5-Nov-07 17:10

How does the dismissal of the dialog by OK or Cancel relate to the Exit Code 2?

David Crow6-Nov-07 2:45

David Crow

6-Nov-07 2:45

It relates to it 100%. Try it and see.

Llasus6-Nov-07 14:45

Building VC++ Samples from windows platform sdk server 2003 r2

6-Nov-07 14:45

Yes you are right! Exit code of 0 is done when the OK or Cancel button is pushed. And Exit code 2 is when close button or alt-F4 is done. Thank you very much for your help! Big Grin | :-D

shatterstar64575-Nov-07 11:15

shatterstar6457

5-Nov-07 11:15

I am compiling these samples from the command line. 1st and foremost, the vcvars32.bat doesn't show up where the documentation says it should, or at all for that matter. The include, bin, and lib env vars have been set, yet and still, when I run nmake, cl.exe cant find any of my include paths. Oh yea, Im using the cl.exe from the drivers developers kit since the platform sdk doesnt have a 32bit version included. Please help me.

Re: Building VC++ Samples from windows platform sdk server 2003 r2

Mark Salsbery5-Nov-07 11:21

Re: Building VC++ Samples from windows platform sdk server 2003 r2

5-Nov-07 11:21

shatterstar6457 wrote:
the vcvars32.bat doesn't show up where the documentation says it should

Where are you expecting to find vcvars32.bat?

It's created when installing a visual C++ compiler and it sounds like you don't have
one installed.

MArk

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

shatterstar64575-Nov-07 11:53

shatterstar6457

5-Nov-07 11:53

..\vc\bin, isnt it installed with the installer?

Re: Building VC++ Samples from windows platform sdk server 2003 r2

Mark Salsbery5-Nov-07 12:08

Re: Building VC++ Samples from windows platform sdk server 2003 r2

5-Nov-07 12:08

What installer are you referring to??

shatterstar6457 wrote:
Oh yea, Im using the cl.exe from the drivers developers kit since the platform sdk doesnt have a 32bit version included.

That seemed to imply you haven't installed a development environment...

Are you tring to use a compiler that came with the PSDK? I had no idea there was one included.

MArk

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

Mark Salsbery5-Nov-07 12:51

Can I create two Cbrush object at same time? [modified]

5-Nov-07 12:51

shatterstar6457 wrote:
from the drivers developers kit

After reading your post 6 times I finally read that correctly Smile | :)

Anyway, I have no idea if the DDK installer sets up a useable vcvars32.bat
but I know the visual studio installer does.

Maybe download and install 2005 Express. You'll get a free up-to-date compiler
and the vcvars32.bat should be valid and where you expect it to be.

Mark

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

Gofur Halmurat5-Nov-07 10:53

5-Nov-07 10:53

Hello,
Can i create two Cbrush objects in same dialog class?, i tried to do like this

<br />
void CMyChessView::OnDraw(CDC* pDC)<br />
{<br />
CBrush *white = new CBrush;<br />
CBrush *black = new CBrush;<br />
<br />
	CMyChessDoc* pDoc = GetDocument();<br />
	ASSERT_VALID(pDoc);<br />
	// TODO: add draw code for native data here<br />
	white->CreateSolidBrush(RGB(255,255,255));<br />
	black->CreateSolidBrush(RGB(0,0,0));<br />
	<br />
	for (int i=1;i<=8;i++)<br />
		for (int j=1;j<=8;j++)<br />
		{<br />
			pDC->Rectangle((i-1)*56,(j-1)*56,i*56,j*56);<br />
		}<br />
<br />
	<br />
<br />
	<br />
}<br />

but onresize the window some exception errors accured? does anyone know why the errors?

-- modified at 17:02 Monday 5th November, 2007

Mark Salsbery5-Nov-07 10:56

5-Nov-07 10:56

Gofur Halmurat wrote:
Can i create two Cbrush objects in same dialog class?

Yes. The problem is somewhere else.

What line of code causes the exception? What is the specific exception?

Mark

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

Gofur Halmurat5-Nov-07 10:59

5-Nov-07 10:59

Hello, i just changed the post, could u look at the code again please?

now, the error is "Debug Assertion Failed"?

Mark Salsbery5-Nov-07 11:12

5-Nov-07 11:12

Gofur Halmurat wrote:
now, the error is "Debug Assertion Failed"?

There's lots of places that assertions can occur -
you really need to be more specific.

The only thing I can see is you're not freeing the brushes when you're done with them.
Are you depleting all your GDI resources??

Mark

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

Gofur Halmurat5-Nov-07 11:18

5-Nov-07 11:18

Hello,
Yes, i am deleting all GDi resources in desctroctor
I found where the problem is, the creation of those CBrushs cannt be in OnDraw Method, because OnResize method, it will create again the bruths
thanks

Mark Salsbery5-Nov-07 11:17

5-Nov-07 11:17

FWIW, you can simplify your code and reduce the chance of leaks
something like this:

void CMyChessView::OnDraw(CDC* pDC)
{
    CBrush white(RGB(255,255,255));
    CBrush black(RGB(0,0,0));

    CMyChessDoc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    // TODO: add draw code for native data here

    for (int i=1;i<=8;i++)
        for (int j=1;j<=8;j++)
        {
            pDC->Rectangle((i-1)*56,(j-1)*56,i*56,j*56);
        }
}

mark

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

Gofur Halmurat5-Nov-07 11:25