索引:

1.格式化文字输出.

1.格式化文字输出.

TextOut (hdc, x, y, szBuffer,
         wsprintf (szBuffer, TEXT ("The sum of %i and %i is %i"),
                   iA, iB, iA + iB)) ; 

BeginPaint & EndPaint

调用BeginPaint后,Windows将会用hbrBackground中存储的笔刷来擦除背景，同时BeginPaint会让整个客户区域有效而且返回一个设备内容句柄。EndPaint则能释放这个设备内容句柄。

/* Template for normal win32 programs. (c) Zefair 2010 */

#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("Win32");
	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("The Win32 Program"),
			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 message, WPARAM wParam, LPARAM lParam)
{
	HDC hdc;
	PAINTSTRUCT ps;
	RECT rect;

	switch(message)
	{
	case WM_CREATE:
		return 0;

	case WM_PAINT:
		hdc = BeginPaint(hwnd, &ps);

		GetClientRect(hwnd, &rect);
		
		EndPaint(hwnd,&ps);
		return 0;

	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}
	return DefWindowProc(hwnd, message, wParam, lParam);
}