Visual C++ question

Washout

I have a function in a dll which is as follows

long WINAPI SFMessage_Box(LPSTR message,LPSTR title,long mode)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
TRACE("Entering function displaydlg\n");

sfmessage dlg;

dlg.DoModal();

return 0;
}


but if i was to add a dlg.m_Button.ShowWindow(SW_HIDE)

into this function i get a DEBUG ASSERTION FAILED when called from say a VB application or a seperate C/C++ application

Ive tried adding this line of code within the various class functions of sfmessage...like OnInitDialog and OnCreate.

It never works? anyone got any ideas

My knowloedge of MFC absolutely sucks

Jay

Did you try making the dlg global or static?

static sfmessage dlg;

Let me know if it helps.

Washout

Nope Im afraid it didnt work...Im at the end of my tether with this one.

i reckon im going to have to get into HWND's and CWnd's but i dont know how to use those

Jay

That's a really strange error. I am sure I had something very similar there in November, I now remember how I fixed it.

Basically I had an ATL/MFC COM dll that had to display a dialog.
The thing is, it all compiled perfectly, but when I called it from VB, the dialog wouldn't always appear. Really ****ed up. It would appear sometimes and not other times.
Anyway, when i got into it, I checked all the error values. And especially the error returned by the call to DoModal(). As it turned out the error returned was Invalid Window Handle.

But WHY!?
It turned out that I hadn't called
InitCommonControlsEx() which is needed for some controls and window classes.

So this is what I added and called near the beginning of the program or at the Dll entry point.

INITCOMMONCONTROLSEX ComCtrls;
	ComCtrls.dwSize = sizeof(INITCOMMONCONTROLSEX);
	ComCtrls.dwICC = ICC_BAR_CLASSES | ICC_INTERNET_CLASSES;

	if(InitCommonControlsEx(&ComCtrls) == TRUE)
	{
		return true;
	}
	else
	{
		return false;
	}

I have a feeling this will fix your problem.
Let me know.