Loading a string resource.

I am having a real problem loading a string reasource. I started with CString::LoadString(id), but kept getting an assertion failure at the same place the the Bitmap problem below occurs. I changed to using LoadString(HINSTANCE, ... char*, etc), and that worked.

I then meved on and created an about Dialog box. I put a bitmap in and assigned it to a bitmap id in the resource file. But I get the same assertion error as previosly...

AfxGetResourceHandle() line 22 + 33 bytes
CDialog::DoModal() line 496 + 5 bytes
About::DoModal() line 47 + 8 bytes
WindowProc(HWND__ * 0x00000868, unsigned int 273, unsigned int 40001, long 0) line 144
KERNEL32! bff7363b()
KERNEL32! bff942e7()

Do i need to register the HINSTANCE I get passed in my WinMain(), if so, how? if not, what else is wrong?

Who is Participating?
jkrConnect With a Mentor Commented:
>>Do i need to register the HINSTANCE
>>AfxGetResourceHandle() ...
These two statements from your text tell everything - as you're obviously using a MFC' app or a DLL, you'll have to use 'AfxSetResourceHandle ()' supllying the 'HINSTANCE' that was passed to your 'WinMain()'
>>Do i need to register the HINSTANCE I get passed in my WinMain()

It would help if we could see the code where the problems are occuring.
It could perhaps be that the LoadString command is called before the application is fully up and running. If that is the case, try to call LoadString later in your code (maybe at the end of InitInstance) and see if that works.
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Why would that matter?
nigel5Author Commented:
I am now able to use LoadString, but I still get the problem with the About Dialo I am trying to load. Not sure what the stack trace means, I have not delved this far into Windows stuff.

AfxGetInstanceHandle() line 19 + 33 bytes
AfxEndDeferRegisterClass(short 16) line 3609 + 5 bytes
CWnd::CreateDlgIndirect(const DLGTEMPLATE * 0x00409c8c, CWnd * 0x00000000 {CWnd hWnd=0xcc000000}, HINSTANCE__ * 0x00400000) line 276 + 32 bytes
CDialog::DoModal() line 525 + 26 bytes
About::DoModal() line 47 + 8 bytes
WindowProc(HWND__ * 0x00000d10, unsigned int 273, unsigned int 40001, long 0) line 150
KERNEL32! bff7363b()
KERNEL32! bff942e7()

The about dialog source is as follows....

// About.h
#if !defined(_About_H__)
#define _About_H__

#if _MSC_VER >= 1000
#pragma once

// About dialog

class About : public CDialog
// Construction
      About(CWnd* pParent = NULL);   // standard constructor

// Dialog Data
      enum { IDD = IDD_DIALOG1 };
            // NOTE: the ClassWizard will add data members here

// Overrides
      // ClassWizard generated virtual function overrides
      virtual int DoModal();
      virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation

      // Generated message map functions
            // NOTE: the ClassWizard will add member functions here



// Microsoft Developer Studio will insert additional declarations immediately before the previous line.


// About.cpp : implementation file

#include "stdafx.h"
#include "resource.h"
#include "About.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;

// About dialog

About::About(CWnd* pParent /*=NULL*/)
      : CDialog(About::IDD, pParent)
            // NOTE: the ClassWizard will add member initialization here

void About::DoDataExchange(CDataExchange* pDX)
            // NOTE: the ClassWizard will add DDX and DDV calls here

            // NOTE: the ClassWizard will add message map macros here

// About message handlers

int About::DoModal()
      int ret = CDialog::DoModal();
      return ret;


Basically I yanked this from another app that I created with the AppWizard.
nigel5Author Commented:
I use code to create and use this window...
in winmain

on an IDM_ABOUT message
About a;

Funnily enough, if I ignore the assertation failure, the dialog appears with the correct bitmap, but I get an unhandled exception in MFC42D.DLL, 0xC00000005 unhandled exception.

Now, I'm really confused.

nigel5Author Commented:
The exception happens at line 3532 of wincore.cpp

if (!AfxGetThread()->PumpMessage())

>> CWnd * 0x00000000
This function is being called with an invalid CWnd pointer - it seems that your resource template couldn't be loaded properrly ... give me a moment to take a look at the code ;-)
nigel5Author Commented:
It doesn't matter, as I have managed to get round the problem. Thanks though. still an interesting problem :)

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