Why Is My Window Closing?

This is a discussion on Why Is My Window Closing? within the C++ Programming forums, part of the General Programming Boards category; The window keeps closing right away. Please tell me what I'm doing wrong. The following is a condensed version of ...

  1. 08-19-2004 #1
    ShadowMetis
    ShadowMetis is offline
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    Why Is My Window Freezing?

    The window keeps closing right away. Please tell me what I'm doing wrong. The following is a condensed version of the source for it.

    Code:
    #include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance, 
                     HINSTANCE hPrevInstance, 
                     LPSTR     lpCmdLine, 
                     int       nCmdShow)
{
    WNDCLASS WndClass;
    WndClass.style = 0;
    WndClass.cbClsExtra = 0;
    WndClass.cbWndExtra = 0;
    WndClass.lpfnWndProc = WndProc;
    WndClass.hInstance = hInstance;
    WndClass.hbrBackground = (HBRUSH) (COLOR_MENU+1);
    WndClass.hCursor = LoadCursor (NULL, IDC_ARROW);
    WndClass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    WndClass.lpszMenuName = 0;
    WndClass.lpszClassName = "WinProg";
    
    RegisterClass(&WndClass);
    
    HWND hWindow;
    hWindow = CreateWindow("WinProg","Test Windowl",
                           WS_OVERLAPPEDWINDOW,
                           0,0,600,500,NULL,NULL,
                           hInstance, NULL);
    ShowWindow (hWindow, nCmdShow);
    
    UpdateWindow (hWindow);
    MSG Message;
    while (GetMessage(&Message, NULL, 0, 0));
    {
        DispatchMessage(&Message);
    }
    
    return (Message.wParam);
}

LRESULT CALLBACK WndProc (HWND hWnd, UINT uiMessage,
                          WPARAM wParam, LPARAM lParam)
{
    switch(uiMessage)
    {
        case WM_PAINT:
            //some GDI functions
            break;
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
            break;
        default:
            return DefWindowProc (hWnd, uiMessage,
                                  wParam, lParam);
            
    }
}
    Last edited by ShadowMetis; 08-19-2004 at 07:34 PM.
    Code:
    #include <iostream.h>
int var;
int test();
int main() { 
 cout << "Please input your language:\n 1. C (C,C++,C#)\n 2. VB\n 3. Other\n";
 cin >> var;
 return test(); }
int test() {  
 if(var == 1) {
  cout << "Y0u 4r3 t3h 1337\n";
  system("PAUSE");
  return main(); }
 else if(var == 2) {
  cout << "N00B3R!\n";
  system("PAUSE");
  return main(); }
 else if(var == 3) {
  cout << "You were not thought of.\n";
  system("PAUSE");
  return main(); }
 else {      
  return 0; }}
  2. 08-19-2004 #2
    gammahelixx
    gammahelixx is offline
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    In the code here:

    Code:
    switch(uiMessage)
    {
        case WM_PAINT:
            //some GDI functions
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
        default:
            return DefWindowProc (hWnd, uiMessage,
                                  wParam, lParam);
            
    }
    You did not include break; statements at the end of your cases, like this:

    Code:
    switch(uiMessage)
    {
        case WM_PAINT:
            //some GDI functions
          break; <-- missing
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
            break;
  3. 08-19-2004 #3
    ShadowMetis
    ShadowMetis is offline
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    Mar 2004
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    AH!!! Duh on me, lol. Thanks alot.
    Code:
    #include <iostream.h>
int var;
int test();
int main() { 
 cout << "Please input your language:\n 1. C (C,C++,C#)\n 2. VB\n 3. Other\n";
 cin >> var;
 return test(); }
int test() {  
 if(var == 1) {
  cout << "Y0u 4r3 t3h 1337\n";
  system("PAUSE");
  return main(); }
 else if(var == 2) {
  cout << "N00B3R!\n";
  system("PAUSE");
  return main(); }
 else if(var == 3) {
  cout << "You were not thought of.\n";
  system("PAUSE");
  return main(); }
 else {      
  return 0; }}
  4. 08-19-2004 #4
    ShadowMetis
    ShadowMetis is offline
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    Posts
    40
    See any other dumb errors? Now, it freezes right after it finishes going through the WM_PAINT proccess. It won't move close or respond at all.
    Code:
    #include <iostream.h>
int var;
int test();
int main() { 
 cout << "Please input your language:\n 1. C (C,C++,C#)\n 2. VB\n 3. Other\n";
 cin >> var;
 return test(); }
int test() {  
 if(var == 1) {
  cout << "Y0u 4r3 t3h 1337\n";
  system("PAUSE");
  return main(); }
 else if(var == 2) {
  cout << "N00B3R!\n";
  system("PAUSE");
  return main(); }
 else if(var == 3) {
  cout << "You were not thought of.\n";
  system("PAUSE");
  return main(); }
 else {      
  return 0; }}
  5. 08-19-2004 #5
    Codeplug
    Codeplug is offline
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    Join Date
    Mar 2003
    Posts
    4,473
    Post your complete WndProc().

    gg
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