Code goes where...?

This is a discussion on Code goes where...? within the Windows Programming forums, part of the Platform Specific Boards category; Ok, I've just read a tutorial (WinMain) and I'm having a problem, the window closes as soon as the program ...

  1. #1
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    Code goes where...?

    Ok, I've just read a tutorial (WinMain) and I'm having a problem, the window closes as soon as the program is run, I think I know why (There's no code to execute?). But I don't know where I would insert the code, I have done a fair bit in console mode, made a few simple/intermediate programs. Any help would be appreciated.

  2. #2
    Used Registerer jdinger's Avatar
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    Feb 2002
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    1,065
    Post your code (with code tags).

    The code to execute is generally put inside an infinite loop
    (the loop that Translates/Dispatches messages) that
    checks messages. On a WM_QUIT message the loop is exited.

  3. #3
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    Well if you havent got anything inside WinMain() then whats so strange about your programm closing?

  4. #4
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    What I'm trying to say is, I have created the window and all that, but I couldn't add any text etc.. but it doesn't matter, I've decided to stick with console programming for a while.

  5. #5
    Banned maes's Avatar
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    No don't. I find writing a windows program much more exciting. the tings you can do with it

    Here is the hello world program from Charles Petzold's book:
    Code:
    /*------------------------------------------------------------
       HELLOWIN.C -- Displays "Hello, Windows 98!" in client area
                     (c) Charles Petzold, 1998
      ------------------------------------------------------------*/
    
    #include <windows.h>
    
    LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
    
    int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                        PSTR szCmdLine, int iCmdShow)
    {
         static TCHAR szAppName[] = TEXT ("HelloWin") ;
         HWND         hwnd ;
         MSG          msg ;
         WNDCLASS     wndclass ;
    
         wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
         wndclass.lpfnWndProc   = WndProc ;
         wndclass.cbClsExtra    = 0 ;
         wndclass.cbWndExtra    = 0 ;
         wndclass.hInstance     = hInstance ;
         wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
         wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
         wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
         wndclass.lpszMenuName  = NULL ;
         wndclass.lpszClassName = szAppName ;
    
         if (!RegisterClass (&wndclass))
         {
              MessageBox (NULL, TEXT ("This program requires Windows NT!"), 
                          szAppName, MB_ICONERROR) ;
              return 0 ;
         }
         
         hwnd = CreateWindow (szAppName,                  // window class name
                              TEXT ("The Hello Program"), // window caption
                              WS_OVERLAPPEDWINDOW,        // window style
                              CW_USEDEFAULT,              // initial x position
                              CW_USEDEFAULT,              // initial y position
                              CW_USEDEFAULT,              // initial x size
                              CW_USEDEFAULT,              // initial y size
                              NULL,                       // parent window handle
                              NULL,                       // window menu handle
                              hInstance,                  // program instance handle
                              NULL) ;                     // creation parameters
         
         ShowWindow (hwnd, iCmdShow) ;
         UpdateWindow (hwnd) ;
         
         while (GetMessage (&msg, NULL, 0, 0))
         {
              TranslateMessage (&msg) ;
              DispatchMessage (&msg) ;
         }
         return msg.wParam ;
    }
    
    LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
    {
         HDC         hdc ;
         PAINTSTRUCT ps ;
         RECT        rect ;
         
         switch (message)
         {
         case WM_CREATE:
              return 0 ;
              
         case WM_PAINT:
              hdc = BeginPaint (hwnd, &ps) ;
              
              GetClientRect (hwnd, &rect) ;
              
              DrawText (hdc, TEXT ("Hello, Windows 98!"), -1, &rect,
                        DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;
              
              EndPaint (hwnd, &ps) ;
              return 0 ;
              
         case WM_DESTROY:
              PostQuitMessage (0) ;
              return 0 ;
         }
         return DefWindowProc (hwnd, message, wParam, lParam) ;
    }
    But instead of DrawText() to draw your text, use TextOut()
    It has much more functions

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