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#include <windows.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("wm_size") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("WM_SIZE"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
static RECT rect, rect1;
TCHAR szFormat[] = TEXT("%4d***%4d***%4d***%4d");
static TCHAR buffer[10];
switch(msg)
{
case WM_LBUTTONDOWN:
SetRect(&rect1, 10, 10, 10, 10);
InvalidateRect(hwnd, &rect, FALSE);
UpdateWindow(hwnd);
return 0;
case WM_PAINT:
GetUpdateRect(hwnd, &rect, FALSE);
hdc = GetDC(hwnd);
TextOut(hdc, 0, 0, buffer, wsprintf(buffer, szFormat, rect.left, rect.top, rect.right, rect.bottom));
ValidateRect(hwnd, NULL);
ReleaseDC(hwnd, hdc);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, msg, wParam, lParam);
}
case WM_LBUTTONDOWN:
SetRect(&rect1, 10, 10, 10, 10);
InvalidateRect(hwnd, &rect, FALSE);
UpdateWindow(hwnd);
return 0;