Messagebox on program exit

Mike1 (16)
Hello. I've been doing C++ for a week or 2 now and I'm trying to have a messagebox appear when the "X" button on the title bar is clicked.

In notepad, when you type something in then press the X button, it asks you if you want to save the file. I'm trying to simulate that in my program.

I'm using Dev-C++ right now.

Thanks, any help is appreciated. (I wont be able to reply for a little while have to go to movies.)



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#include <windows.h>


LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void CreateMenubar(HWND);
void OpenDialog(HWND);
void LoadFile(LPSTR);

#define IDM_FILE_NEW 1
#define IDM_FILE_QUIT 2
#define IDM_EDIT_UNDO 3
#define IDM_EDIT_REDO 4


HWND ghwndEdit;



int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, 
    LPSTR lpCmdLine, int nCmdShow )
{
  MSG  msg ;    
  WNDCLASS wc = {0};
  HWND hwnd;

  wc.lpszClassName = TEXT( "Opendialog" );
  wc.hInstance     = hInstance ;
  wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
  wc.lpfnWndProc   = WndProc ;
  wc.hCursor       = LoadCursor(0, IDC_ARROW);
  wc.hIcon = LoadIcon (NULL, IDI_APPLICATION);


  
  RegisterClass(&wc);
hwnd =  CreateWindow( wc.lpszClassName, TEXT("Opendialog"),
                WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                150, 150, 400, 300, 0, 0, hInstance, 0);  
                
       

  while( GetMessage(&msg, NULL, 0, 0)) {
    TranslateMessage(&msg);

    DispatchMessage(&msg);
  }
  return (int) msg.wParam;
}

LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
   
  switch(msg)  
  {
      case WM_CREATE:

          ghwndEdit = CreateWindowEx(WS_EX_RIGHTSCROLLBAR, TEXT("edit"), NULL,    
                        WS_VISIBLE | WS_CHILD | WS_HSCROLL | WS_VSCROLL | ES_MULTILINE,
                        0, 0, 260, 180,        
                        hwnd, (HMENU) 1, NULL, NULL);    




	   CreateMenubar(hwnd);
	   break;

      case WM_SIZE:
          SetWindowPos(ghwndEdit, NULL, 0, 0, LOWORD(lParam), HIWORD(lParam),
             SWP_NOMOVE | SWP_NOZORDER);
             

          break;

      case WM_COMMAND:
	   if (wParam==IDM_FILE_NEW) {
              OpenDialog(hwnd);
	    }
	    
	    	    
	    	   if (wParam==IDM_FILE_QUIT) {
	    
           int msgboxID = MessageBox(hwnd, TEXT("Are you sure you want to quit?"), TEXT("Quit?"), MB_YESNO | MB_ICONQUESTION);
    switch (msgboxID)
    {
    case IDYES:
        PostQuitMessage(0);
        break;

    }

    return msgboxID;




          break;
}
          break;

      case WM_DESTROY:
          PostQuitMessage(0);
          break;

    

  }
  return DefWindowProc(hwnd, msg, wParam, lParam);
}	

void CreateMenubar(HWND hwnd) {
  HMENU hMenubar;
  HMENU hMenu;
  HMENU hMenu2;

  hMenubar = CreateMenu();
  hMenu = CreateMenu();
  AppendMenu(hMenubar, MF_POPUP, (UINT_PTR)hMenu, TEXT("&File"));
  AppendMenu(hMenu, MF_STRING, IDM_FILE_NEW, TEXT("&Open"));
  AppendMenu(hMenu, MF_STRING, IDM_FILE_QUIT, TEXT("&Quit"));
  
  hMenu2 = CreateMenu();
  AppendMenu(hMenubar, MF_POPUP, (UINT_PTR)hMenu2, TEXT("&Edit"));
  AppendMenu(hMenu2, MF_STRING, IDM_EDIT_UNDO, TEXT("&Undo"));
  AppendMenu(hMenu2, MF_STRING, IDM_EDIT_REDO, TEXT("&Redo"));
  
  SetMenu(hwnd, hMenubar);
}

void OpenDialog(HWND hwnd) 
{
  OPENFILENAME ofn;
  TCHAR szFile[MAX_PATH];

 
  ZeroMemory(&ofn, sizeof(ofn));
  ofn.lStructSize = sizeof(ofn);
  ofn.lpstrFile = szFile;
  ofn.lpstrFile[0] = '\0';
  ofn.hwndOwner = hwnd;
  ofn.nMaxFile = sizeof(szFile);
  ofn.lpstrFilter = TEXT("All files(*.*)\0*.*\0");
  ofn.nFilterIndex = 1;
  ofn.lpstrInitialDir = NULL;
  ofn.lpstrFileTitle = NULL;
  ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
  

  if(GetOpenFileName(&ofn))
      LoadFile(ofn.lpstrFile);
}

void LoadFile(LPSTR file)
{
  HANDLE hFile;
  DWORD dwSize;
  DWORD dw;

  LPBYTE lpBuffer = NULL;

  hFile = CreateFile(file, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
  dwSize = GetFileSize(hFile, NULL);
  lpBuffer = (LPBYTE) HeapAlloc(GetProcessHeap(), HEAP_GENERATE_EXCEPTIONS, dwSize + 1);
  ReadFile(hFile, (LPWSTR)lpBuffer, dwSize, &dw, NULL);
  CloseHandle(hFile);
  lpBuffer[dwSize] = 0;
  SetWindowText(ghwndEdit, (LPSTR) lpBuffer);
  HeapFree(GetProcessHeap(), 0, lpBuffer);
}
anonymous23323124 (1383)
What exactly is your question? What are you having trouble with? If you are more specific, you will get a more expedient solution.
Last edited on
closed account (zb0S216C)
Mike1 wrote:
I'm using Dev-C++ right now.

Oh, god. Please tell me your joking.

As for the code, you need to add the WM_CLOSE event to your procedure. This event handles the application termination when the X is activated. For example:

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// This is inside your procedure.
switch( msg )
{
    WM_CLOSE:
        MessageBox( HWND_DESKTOP, "Are you sure you want to quit?", "Confirmation", MB_OKCANCEL | WS_POPUP );
        break;

    // Other events...
}


Wazzak
Last edited on
anonymous23323124 (1383)
@Mike1 Here is an article about why DevC++ is a bad choice, and some alternatives:
http://www.cplusplus.com/forum/articles/36896/
Mike1 (16)
Xander, I'm just wondering how I could have a messagebox appear when the X button is clicked and if No or Cancel is clicked it doesn't close the program.

Thanks Framework, works exactly how I wanted.

I'll try out some of the IDEs today Xander.

Thanks.

1 more thing, when I have it check if Cancel is clicked, how can I have it not close the program?

Edit

Nevermind, found out what I had to do.

Had to put "return 1;"
Last edited on
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