最简单的Windows程序源代码

#include <Windows.h>
#include <stdio.h>

LRESULT CALLBACK WinProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
BOOL RegisterWndClass(HINSTANCE hIntance, const char* szClass);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
	HWND hwnd = NULL;
	static char szAppName[] = "WinTest";

	if (!RegisterWndClass(hInstance, szAppName))
	{
        MessageBox(NULL, "注册窗口失败!", "创建窗口", MB_OK);
		return 0;
	}


	hwnd = CreateWindow(szAppName, "测试窗口", WS_OVERLAPPEDWINDOW, 0, 0, CW_USEDEFAULT, CW_USEDEFAULT, NULL,
		NULL, hInstance, NULL);

	if (NULL == hwnd)
	{
		MessageBox(NULL, "创建窗口失败", "创建窗口", MB_OK);
		return 0;
	}

	ShowWindow(hwnd, SW_SHOWNORMAL);
	UpdateWindow(hwnd);

	MSG msg = {0};
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return int(msg.wParam);
}

BOOL RegisterWndClass(HINSTANCE hIntance, const char* szClass)
{
	WNDCLASS wndClass;

	wndClass.cbClsExtra		= 0;
	wndClass.cbWndExtra		= 0;
	wndClass.hbrBackground	= (HBRUSH)GetStockObject(BLACK_BRUSH);
	wndClass.hCursor		= LoadCursor(NULL, IDC_CROSS);
	wndClass.hIcon			= LoadIcon(NULL, IDI_ERROR);
	wndClass.hInstance		= hIntance;
	wndClass.lpfnWndProc	= WinProc;
	wndClass.lpszClassName	= szClass;
	wndClass.lpszMenuName	= NULL;
	wndClass.style			= CS_HREDRAW | CS_VREDRAW;

	return ::RegisterClass(&wndClass);
}

LRESULT CALLBACK WinProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	switch (uMsg)
	{
	case WM_CHAR:
		{
			char szChar[MAX_PATH] = {0};
			sprintf(szChar, "您刚刚输入的字符ASSIC: %d", wParam);
			MessageBox(hwnd, szChar, "输入字符", MB_OK);
		}
		
		break;

	case WM_LBUTTONDOWN:
		{
			MessageBox(hwnd, "您按下了左键", "鼠标点击", MB_OK);
			HDC hdc = GetDC(hwnd);
			char *szText = "鼠标点击事件记录";
			TextOut(hdc, 0, 50, szText, strlen(szText));
			ReleaseDC(hwnd, hdc);
		}		
		
		break;

	case WM_PAINT:
		{
				PAINTSTRUCT ps;
			HDC hdc = BeginPaint(hwnd, &ps);
			char* szText = "我们的第一个Windows窗口";
			TextOut(hdc, 0, 0, szText, strlen(szText));
			EndPaint(hwnd, &ps);
		}
		break;

	case WM_CLOSE:
		if (IDYES == MessageBox(hwnd, "退出程序?", "退出", MB_YESNO))
		{
			DestroyWindow(hwnd);
		}

		break;

	case WM_DESTROY:
		PostQuitMessage(0);
		break;

	default:
		return DefWindowProc(hwnd, uMsg, wParam, lParam);
	}

	return 0;
}