Second window not appear

[uglybetty]

Hi, I have modify this code to appear 2 windows at one time. It does not show error but when compiled, it only shows the first window. Can anyone tell me where I'm going wrong with this code? I have search through the internet but still not clear to me. This is my first time with windows programming.

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK WndProc2(HWND, UINT, WPARAM, LPARAM);


int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
					LPSTR lpCmdLine, int nCmdShow )
{
  MSG  msg ;    
  WNDCLASS wc = {0};
  wc.lpszClassName = TEXT( "Menu 1" );
  wc.hInstance     = hInstance ;
  wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
  wc.lpfnWndProc   = WndProc ;
  wc.hCursor       = LoadCursor(0, IDC_ARROW);

  
  RegisterClass(&wc);
  CreateWindow( wc.lpszClassName, TEXT("Menu 1"),
                WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                550, 150, 270, 350, 0, 0, hInstance, 0);  

  while( GetMessage(&msg, NULL, 0, 0)) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return (int) msg.wParam;
  
  MSG  msg1 ;
  WNDCLASS wc1 = {0};
  wc1.lpszClassName = TEXT( "Menu 2" );
  wc1.hInstance     = hInstance ;
  wc1.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
  wc1.lpfnWndProc   = WndProc ;
  wc1.hCursor       = LoadCursor(0, IDC_ARROW);

  
  RegisterClass(&wc1);
  CreateWindow( wc1.lpszClassName, TEXT("Menu 2"),
                WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                550, 150, 300, 350, 0, 0, hInstance, 0);  

  while( GetMessage(&msg1, NULL, 0, 0)) {
    TranslateMessage(&msg1);
    DispatchMessage(&msg1);
  }
  return (int) msg1.wParam;
}

[Thomas1965]

Once the message loop on line 22-25 ends your program will end on line 26 so it never gets to line 28 creating a second window.
BTW what's your plan? Normally you have one main window. If you need child windows normally you create dialogs and call them inside your Windows proc.

[uglybetty]

Thank u.

I'm just experimenting. It works. If I want to make a new window appear when I click a button, do I have to put entire Menu2 coding under WM_COMMAND?

case WM_COMMAND:
      {
           if (LOWORD(wParam) == 3) {
                
	   }

[Thomas1965]

About WM_COMMAND

Sent when the user selects a command item from a menu, when a control sends a notification message to its parent window, or when an accelerator keystroke is translated.

https://msdn.microsoft.com/en-us/library/windows/desktop/ms647591(v=vs.85).aspx

Have also a look at Charles Petzold's "Windows bible"
https://www-user.tu-chemnitz.de/~heha/petzold/petzold.htm

[arthur44]

//Register both window classes and create both windows and then use only the main message loop with both callback procedures
#include <tchar.h>
#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK WndProc2(HWND, UINT, WPARAM, LPARAM);


int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow )
{
MSG msg ;
WNDCLASS wc = {0};
wc.lpszClassName = TEXT( "Menu 1" );
wc.hInstance = hInstance ;
wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
wc.lpfnWndProc = WndProc ;
wc.hCursor = LoadCursor(0, IDC_ARROW);


RegisterClass(&wc);
CreateWindow( wc.lpszClassName, TEXT("Menu 1"),
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
550, 150, 270, 350, 0, 0, hInstance, 0);
MSG msg1 ;
WNDCLASS wc1 = {0};
wc1.lpszClassName = TEXT( "Menu 2" );
wc1.hInstance = hInstance ;
wc1.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
wc1.lpfnWndProc = WndProc ;
wc1.hCursor = LoadCursor(0, IDC_ARROW);


RegisterClass(&wc1);
CreateWindow( wc1.lpszClassName, TEXT("Menu 2"),
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
450, 150, 300, 350, 0, 0, hInstance, 0);

while( GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int) msg.wParam;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
case WM_CREATE:

break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}

return 0;
}
LRESULT CALLBACK WndProc2 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
case WM_CREATE:

break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}

return 0;
}