how come... (bmp loading)

When I use same technnique to load a bmp to my modeless child window as i do to the main window it doesnt appear?

Code:

---

BOOL CALLBACK AboutWndProc(HWND About,UINT msg,WPARAM wParam,LPARAM lParam)
{
    static HBITMAP AboutImg = NULL;
   
    switch(msg)
    {
        case WM_CLOSE:
              ShowWindow(About,SW_HIDE);
              break;
       
        case WM_DESTROY:
              ShowWindow(About,SW_HIDE);
              break;
             
        case WM_CREATE:
              AboutImg = LoadBitmap(GetModuleHandle(NULL),MAKEINTRESOURCE(ABOUT_IMAGE));
              if(AboutImg == NULL)
              {
                  MessageBox(NULL,"About image couldn't be loaded","Error",MB_OK);
              }
        break;
       
        case WM_PAINT:
              {
                BITMAP bm;
                PAINTSTRUCT ps;
               
                HDC hdc = BeginPaint(About,&ps);
               
                HDC hdcMem = CreateCompatibleDC(hdc);
                HBITMAP hbmOld = (HBITMAP)SelectObject(hdcMem,AboutImg);
               
                GetObject(AboutImg,sizeof(bm),&bm);
               
                BitBlt(hdc,0,0,bm.bmWidth,bm.bmHeight,hdcMem,0,0,SRCCOPY);
               
                SelectObject(hdcMem,hbmOld);
                DeleteDC(hdcMem);
               
                EndPaint(About,&ps);
              }
        break;
       
        default:
              return FALSE;
    }
   
    return TRUE;
}

---

basically what im trying to accomplish is loading my bitmap to my child window.

Well what happens? Does the MessageBox appear? Are the values for bm.bmWidth and bm.bmHeight valid?

P.S. Bear in mind that when WM_DESTROY is called your window is in the process of being destroyed. Hiding it won't do anything.

I know =P, well, I figured by doing GetObject(AboutImg,sizeof(bm),&bm) would get the width and height etc. of my bmp. It works fine when doing so to the parent window.

Drawing code looks OK. If the image is loading and returning valid sizes then all looks good.

My bet is that the image never gets loaded, Check it is not NULL in the WM_PAINT.

If you are not creating the dialog with CreateWindow(Ex) then add a WM_INITDIALOG handler.

case WM_CREATE://called from CreateWindow or CreateWindowEx
case WM_INITDIALOG: //called from DialogBox functions

//ect

break;

>>Bear in mind that when WM_DESTROY is called your window is in the process of being destroyed

As the default msg processing is not called ( DefWindowProc() ) nor is DestroyWindow() in the WM_CLOSE handler, a WM_DESTROY msg should not be sent.


You should be calling DefWindowProc() for any msgs you do not process. ie non client draws, sizes ect ect....

ie

default:
return DefWindowProc(About, msg, wParam, lParam);

YES!!! that was it, WM_INITDIALOG. Thanks for the tip to =P