problem using CDialog::Create, assert error

[Luis E Cuadrado]

Hello everybody, Here is my problem. I'm trying to display a dialog and in the Create() function I'm getting an assert error. I dig up through the debugger and I found out where I'm getting the assert error is in AfxGetResourceHandle(). Here is my code:

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
 	// TODO: Place code here.
	CMainDlg *mainDlg = new CMainDlg(); //Base class is a CDialog
	BOOL bRet = mainDlg->Create(IDD_MAIN_DIALOG, NULL); //-->I'm getting the assertion error here!
	if (bRet != 0)
	{
		mainDlg->ShowWindow(SW_SHOW);
	}
	else if(bRet == 0)
	{
		AfxMessageBox("Error Creating Dialog");
	}

	return 0;
}

As you noticed, all I'm trying to do is to display a dialog. Is there anything that I have to set in advance before I create the dialog and display it? Any answer is more than welcome. Best regards, Luis E. Cuadrado :0)

[Tim Smith]

It has been a long time since I have done MFC, but since you have replaced MFCs WinMain, it has been unable to initialize. What you should have done is display your dialog from the InitInstance method of your CApplication class. Tim Smith I'm going to patent thought. I have yet to see any prior art.

[David Crow]

Have you stepped through the Create() code to see why afxCurrentResourceHandle is still NULL?

[Luis E Cuadrado]

Hi DavidCrow, Yes, I stepped through the Create() code. The assertion is comming in the AfxFindResourceHandle() function. I included the portion of the code where the assert error comes and I pointed out where the assert error occurs. Aparently the value pModuleState->m_bSystem returned by AfxGetModuleState() is causing the assert error. Here is the code.

HINSTANCE AFXAPI AfxFindResourceHandle(LPCTSTR lpszName, LPCTSTR lpszType)
{
	ASSERT(lpszName != NULL);
	ASSERT(lpszType != NULL);

	HINSTANCE hInst;

	// first check the main module state
	AFX_MODULE_STATE* pModuleState = AfxGetModuleState();
	if (!pModuleState->m_bSystem)
	{
		hInst = AfxGetResourceHandle(); //-->ASSERT OCCURS HERE!!!
		if (::FindResource(hInst, lpszName, lpszType) != NULL)
			return hInst;
	}
.
.
.

I hope this helps. Before I forget, thanks for your reply David Luis E. Cuadrado :0)

[David Crow]

Technically, the assertion is being fired within the inline function AfxGetResourceHandle(), which, in this case, is being called by AfxFindResourceHandle(). Have you tried Tim's suggestion? I've never tried creating an MFC application without the other supporting pieces in place.

[Luis E Cuadrado]

I'm going to try Tim's suggestion. As soon as I find something, I will post back the results. Thanks for your replys. Luis E. Luis E. Cuadrado :0)

[Ryan Binns]

Simple. In order to use MFC you must initialise it first.

if(!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
{
// MFC failed to initialise properly
return 1;
}

Then your MFC operations will work as normal :). You don't need to call any cleanup functions at the end. Ryan Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2nd April 2003, The Lounge)
Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"