test program for DrawFrame (user32.dll)

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Hopefully this test program will enable someone to figure out what DrawFrame does (I cant work it out)
// menutst.cpp : Defines the entry point for the application.
//

#include <windows.h>

// Global Variables:
HINSTANCE hInst;								// current instance
LPSTR szWindowClass = "x";
// Foward declarations of functions included in this code module:
ATOM				MyRegisterClass(HINSTANCE hInstance);
BOOL				InitInstance(HINSTANCE, int, ATOM);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK	WndProc2(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK	About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
 	// TODO: Place code here.
	MSG msg;
	ATOM x;

	// Initialize global strings
	x = MyRegisterClass(hInstance);

	// Perform application initialization:
	if (!InitInstance (hInstance, nCmdShow, x)) 
	{
		return FALSE;
	}

	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0)) 
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage is only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;
	wcex.cbSize = sizeof(WNDCLASSEX); 

	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= (WNDPROC)WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= 0;
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)GetStockObject(LTGRAY_BRUSH);
	wcex.lpszMenuName	= 0;
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= 0;

	return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HANDLE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
typedef VOID (CALLBACK *DF)(HDC hdc, RECT *r,DWORD width,DWORD type);
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow, ATOM a)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, "test", WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }
   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	
	HMODULE x;
	DF y;
	RECT r;
	PAINTSTRUCT ps;
	HDC hdc;
	DWORD type;
	INT i;
	switch(message)
	{

		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		case WM_PAINT:
			x = GetModuleHandle("user32.dll");
			y = (DF)GetProcAddress(x,"DrawFrame");
			hdc = BeginPaint(hWnd, &ps);
			r.top = 0;
			r.bottom = r.top + 20;
			r.left = 0;
			r.right = r.left + 20;
			type = 0;
			for (i=0;i<40;i++)
			{
				y(hdc,&r,5,type);
				r.left += 20;
				r.right += 20;
				type++;
			}
			r.bottom += 20;
			r.top += 20;
			r.left = 0;
			r.right = r.left + 20;
			for (i=0;i<40;i++)
			{
				y(hdc,&r,5,type);
				r.left += 20;
				r.right += 20;
				type++;
			}
			r.bottom += 20;
			r.top += 20;
			r.left = 0;
			r.right = r.left + 20;
			for (i=0;i<40;i++)
			{
				y(hdc,&r,5,type);
				r.left += 20;
				r.right += 20;
				type++;
			}
			r.bottom += 20;
			r.top += 20;
			r.left = 0;
			r.right = r.left + 20;
			for (i=0;i<40;i++)
			{
				y(hdc,&r,5,type);
				r.left += 20;
				r.right += 20;
				type++;
			}
			r.bottom += 20;
			r.top += 20;
			r.left = 0;
			r.right = r.left + 20;
			for (i=0;i<40;i++)
			{
				y(hdc,&r,5,type);
				r.left += 20;
				r.right += 20;
				type++;
			}
			r.bottom += 20;
			r.top += 20;
			r.left = 0;
			r.right = r.left + 20;
			for (i=0;i<40;i++)
			{
				y(hdc,&r,5,type);
				r.left += 20;
				r.right += 20;
				type++;
			}
			r.bottom += 20;
			r.top += 20;
			r.left = 0;
			r.right = r.left + 20;
			for (i=0;i<40;i++)
			{
				y(hdc,&r,5,type);
				r.left += 20;
				r.right += 20;
				type++;
			}
			r.bottom += 20;
			r.top += 20;
			r.left = 0;
			r.right = r.left + 20;
			for (i=0;i<40;i++)
			{
				y(hdc,&r,5,type);
				r.left += 20;
				r.right += 20;
				type++;
			}
		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}

// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
		case WM_INITDIALOG:
				return TRUE;

		case WM_COMMAND:
			if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) 
			{
				EndDialog(hDlg, LOWORD(wParam));
				return TRUE;
			}
			break;
	}
    return FALSE;
}

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