reactos/modules/rostests/win32/user32/paintdesktop/PaintDesktop.c

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/*
* PROJECT: ReactOS Tests
* LICENSE: GPL - See COPYING in the top level directory
* FILE: rostests/win32/user32/paintdesktop/PaintDesktop.c
*
* PURPOSE: Demonstrates how the user32!PaintDesktop() API visually works.
* This API paints the desktop inside the given HDC with its
* origin always fixed to the origin of the monitor on which
* the window is present.
*
* PROGRAMMER: Hermes Belusca-Maito
*/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
static HINSTANCE hInst;
static PWSTR szTitle = L"PaintDesktop";
static PWSTR szWindowClass = L"PAINTDESKTOP";
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int APIENTRY wWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPWSTR lpCmdLine,
int nCmdShow)
{
MSG msg;
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
MyRegisterClass(hInstance);
if (!InitInstance (hInstance, nCmdShow))
return FALSE;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int) msg.wParam;
}
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASS wc;
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIconW(NULL, IDI_WINLOGO);
wc.hCursor = LoadCursorW(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = szWindowClass;
return RegisterClass(&wc);
}
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
hInst = hInstance;
hWnd = CreateWindow(szWindowClass, szTitle, 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)
{
switch (message)
{
case WM_MOVE:
InvalidateRect(hWnd, NULL, TRUE);
UpdateWindow(hWnd);
break;
case WM_ERASEBKGND:
return (LRESULT)PaintDesktop((HDC)wParam);
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}