Re: Need Help Debugging DoModal Returning -1 In DLL

From:

"Emanuel Masciarelli" <emanuelpm@hotmail.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 15 Apr 2009 18:06:26 -0500

Message-ID:

<OVz6O7hvJHA.4324@TK2MSFTNGP05.phx.gbl>

Moving all my code to another function (ThreadProc) then running that
function in another thread solves the issue. I'm glad it works, but I need
to know why :). Any ideas?

unsigned long __cdecl LauncherUIEntry()
{
  HANDLE hThread = CreateThread(0, 0, &ThreadProc, 0, 0, 0);
  WaitForSingleObject(hThread, INFINITE);

  return 0;
}

--Emanuel

"Emanuel Masciarelli" <emanuelpm@hotmail.com> wrote in message
news:exQZ12hvJHA.4956@TK2MSFTNGP02.phx.gbl...

And to further confuse the situation, I changed the DLL function to only
contain

CFileDialog dlgTest(TRUE, L"txt", L"", OFN_FILEMUSTEXIST, L"Text files
(*.txt)|*.txt");
nResponse = dlgTest.DoModal();

and the dialog appears, vanishes, and nResponse is 1.

--Emanuel

"Emanuel Masciarelli" <emanuelpm@hotmail.com> wrote in message
news:eejMevhvJHA.192@TK2MSFTNGP05.phx.gbl...

Marking the Dialog as Visible in the Resource file makes it visible for a
split second before returning -1. If I override DoModal() in my Dialog
and put in this code:

int LoginDlg::DoModal()
{
int RetCode = 0;
AFX_MANAGE_STATE(AfxGetStaticModuleState());
RetCode = CDialog::DoModal();
return RetCode;
}

I get a crash in IsKindOf() inside the DoModal (I cannot see source, only
assembly in Visual Studio 2008). Removing the AFX line gives me the same
result, -1 as RetCode.

--Emanuel

"Emanuel Masciarelli" <emanuelpm@hotmail.com> wrote in message
news:Odi$ImhvJHA.1212@TK2MSFTNGP04.phx.gbl...

I didn't know No Fail Create existed! Unfortunately it didn't fix the
issue, and GetLastError returns 0. The function in my DLL looks like
such:

unsigned long __cdecl LauncherUIEntry(HINSTANCE hDll)
{
HINSTANCE hOldResource = AfxGetResourceHandle();
AfxSetResourceHandle(hDll);

// Load COM
CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

// Bring up the login GUI
LoginDlg* pLoginDlg = new LoginDlg();
INT_PTR nResponse = pLoginDlg->DoModal(); // nResponse is -1

if (IDOK == nResponse)
{
   // Successfully logged in, bring up main window
   LauncherMainDlg mainDlg;
   mainDlg.DoModal();
}

delete pLoginDlg;

// Unload COM
CoUninitialize();

AfxSetResourceHandle(hOldResource);

return 0;
}

Anything glaringly offensive?

--Emanuel

"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message
news:tgmcu4lki49arl1ih0hepc25i62pa5dslp@4ax.com...

Show some of the code.

Also, mark your dialog with the "No Fail Create" attribute TRUE. If it
comes up and a
control is missing, that explains the problem. Also, did you check the
GetLastError
value?
joe

On Wed, 15 Apr 2009 14:32:15 -0500, "Emanuel Masciarelli"
<emanuelpm@hotmail.com> wrote:

I am not very MFC englightened so please bear with me on this. I am
creating a MFC application that has some dialogs, then it will
dynamically
load a DLL and call an exported function on it that itself displays
some
dialogs. Everything works as desired until the DLL tries to DoModal()
on
one of its dialogs. The call returns right away with a -1, and I
cannot
seem to be able to step into the function, so I don't know what is
going on.
The exported DLL function does start with
AFX_MANAGE_STATE(AfxGetStaticModuleState()); which is what I found
while
searching for solutions on the net. If you can give me any pointers or
things I could be missing, I would appreciate it. If you need more
info
please let me know what kind would be useful.

--Emanuel

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm