newbie modal question

Is there a way to make a window modal, or is that only for dialog boxes?

Thanks in advance

Yes, by disabling the owner window using EnableWindow. Then when your modal window is destroyed, you re-enable your owner window and give it the focus. Enabling and disabling windows is accomplished with the EnableWindow function.

Here's a quick example. You click on the owner window's client area to lauch the modal window.

Code:

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#include <windows.h>

LRESULT CALLBACK Owner_WndProc( HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam )
{
  static HWND hwndModal;
 
  switch(msg) 
  {
    case WM_CREATE:
      return 0;
     
    case WM_LBUTTONDOWN:
      hwndModal = CreateWindow( "DialogWnd",
                                "Modal Window",
                                WS_POPUPWINDOW|WS_CAPTION|WS_VISIBLE,
                                (GetSystemMetrics( SM_CXSCREEN )-200)/2,
                                (GetSystemMetrics( SM_CYSCREEN )-100)/2,
                                200, 100,
                                hwnd, 0, GetModuleHandle(0), 0 );
      return 0;                               

    case WM_DESTROY:
      PostQuitMessage( 0 );
      return 0;

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

LRESULT CALLBACK Modal_WndProc( HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam )
{
  static HWND hwndOwner;
 
  switch( msg )
  {
    case WM_CREATE:
      hwndOwner = GetWindow(hwnd,GW_OWNER);
      EnableWindow( hwndOwner, FALSE );
      return 0;

    case WM_DESTROY:
      EnableWindow( hwndOwner, TRUE );
      SetFocus( hwndOwner );
      return 0;
     
    default:
      return DefWindowProc( hwnd, msg, wParam, lParam );
  }
}

int WINAPI WinMain( HINSTANCE hInst, HINSTANCE hPrev, LPSTR args, int nShow )
{
  WNDCLASS wc = {0};
 
  // Register the owner window class.
  wc.lpszClassName = TEXT( "OwnerWnd" );
  wc.hInstance    = hInst ;
  wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
  wc.lpfnWndProc  = Owner_WndProc ;
  wc.hCursor      = LoadCursor(0,IDC_ARROW);
  RegisterClass(&wc);
 
  // Register the modal dialog window's class.
  wc.lpszClassName = TEXT( "DialogWnd" );
  wc.lpfnWndProc  = Modal_WndProc ;
  RegisterClass(&wc);
 
  // Create the owner window.
  CreateWindow("OwnerWnd",TEXT("Owner Window"),
              WS_OVERLAPPEDWINDOW|WS_VISIBLE,
              (GetSystemMetrics( SM_CXSCREEN )-400)/2,
              (GetSystemMetrics( SM_CYSCREEN )-300)/2,
              400,300, 0,0, hInst, 0);
 
  MSG  msg ; 
  while( GetMessage(&msg,0,0,0) > 0 ) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return (int)msg.wParam;
}

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Thank you