Resize: WS_SIZE? [Resolved]

[The Hobo]

I want to be able to resize my controls when the user resizes my form. I tried:

  case WM_SIZE:
    if ((HWND)lParam == hwnd)
    {
      MessageBox(hwnd, "You resized", "Resize", MB_OK | MB_ICONINFORMATION);	
    }

How do I get this to work?

[chilibean]

I think the best way would be to catch all the WM_SIZE messages that are sent to your main window. Then have a procedure that can make the proper sizing calculations based on the current size of the main window. These calculations are then applied to each control within the main window. Perhaps you can use enumeration to cycle through all the controls...

[The Hobo]

I know what I have to do, but I don't know how. With my source in the previous post, the MessageBox doesn't fire when being resized. Why?

[chilibean]

Try this...

#include <windows.h>

int fwSizeType=0;
int nWidth=0;
int nHeight=0;

LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{        //Run through messages that window receives
   switch (uMsg)
    {

      case WM_SIZE:

              fwSizeType = wParam;      // resizing flag 
              nWidth = LOWORD(lParam);  // width of client area 
              nHeight = HIWORD(lParam); // height of client area 
 
              MessageBox(hWnd, "You resized", "Resize", MB_OK | MB_ICONINFORMATION);    
                


              break;
      
      case WM_DESTROY:
        
                
              PostQuitMessage(0);
              
              break;
      
      default:
            return(DefWindowProc(hWnd, uMsg, wParam, lParam));
   }

   return(0L);
}


int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                     LPTSTR lpCmdLine, int nCmdShow)
{    //Create the Window
   MSG      msg;
   HWND     hWnd; 
   WNDCLASS wc;

   wc.style         = CS_HREDRAW | CS_VREDRAW;
   wc.lpfnWndProc   = (WNDPROC)WndProc;       
   wc.cbClsExtra    = 0;                      
   wc.cbWndExtra    = 0;                      
   wc.hInstance     = hInstance;              
   wc.hIcon         = NULL; 
   wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
   wc.hbrBackground = (HBRUSH)(GRAY_BRUSH-1);
   wc.lpszMenuName  = "TEST";              
   wc.lpszClassName = "TEST";              

   if (!RegisterClass(&wc))
      return(0L);

   

   hWnd = CreateWindow("TEST", 
                       "TEST",    
                       DS_CENTER | WS_OVERLAPPEDWINDOW, 
                       10, 10, 750, 500, 
                       NULL,              
                       NULL,              
                       hInstance,         
                       NULL);

   

   ShowWindow(hWnd, nCmdShow); 
   UpdateWindow(hWnd);        
   
   
   while (GetMessage(&msg, NULL, 0, 0))   
     {
       TranslateMessage(&msg); 
       DispatchMessage(&msg);  
     }

   return(msg.wParam); 
}