第一个Window GUI程序

最简单的windows GUI程序，由WMain.cpp和WinProc.cpp组成，前者负责初始化窗口，负责处理消息。

File: WMain.cpp

#include <windows.h>

extern LRESULT CALLBACK WindowF(HWND, UINT, WPARAM, LPARAM);
char szWinName[] = "MyWin";
char szTitle[] = "My WINDOW";

int WINAPI WinMain(HINSTANCE hThisInst, HINSTANCE hPrevInst, LPSTR lpszArgs, int nWinMode)
{
	// Define window class
	HWND hwnd;
	MSG msg;
	WNDCLASSEX wcl;

	wcl.cbClsExtra = 0;	//	extra bytes
	wcl.cbSize = sizeof(WNDCLASSEX);
	wcl.cbWndExtra = 0;
	wcl.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wcl.hCursor = LoadCursor(NULL, IDC_ARROW);
	wcl.hIcon = LoadIcon(NULL, IDI_WINLOGO);
	wcl.hIconSm = NULL;
	wcl.hInstance = hThisInst;
	wcl.lpfnWndProc = WindowF;
	wcl.lpszClassName = szWinName;
	wcl.lpszMenuName = NULL;
	wcl.style = 0;

	// Registration of class
	if (!RegisterClassEx(&wcl))
		return 0;

	// Create Window
	hwnd = CreateWindow(
		szWinName,
		szTitle,
		WS_OVERLAPPEDWINDOW | WS_HSCROLL | WS_VSCROLL | WS_SYSMENU,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		HWND_DESKTOP,
		NULL,
		hThisInst,
		NULL
		);

	ShowWindow(hwnd, SW_RESTORE);
	UpdateWindow(hwnd);

	// Serve Messages
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}

File: WinProc.cpp

#include <windows.h>

LRESULT CALLBACK WindowF(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
	case WM_DESTROY:
		// User Closed the window
		PostQuitMessage(0);
		break;
	default:
		break;
	}

	// Call the default window handler
	return DefWindowProc(hwnd, message, wParam, lParam);
}

　　运行结果示例: