MFC学习（一）

一、首先根据SDK创建一个窗口。

SDK窗口创建步骤有：

1、编写WinMain函数

2、设计窗口类（WNDCLASS）

3、注册窗口类

4、创建窗口

5、显示并更新窗口

6、编写消息循环

7、编写窗口过程函数

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

LRESULT CALLBACK WinSunProc(
	HWND hwnd,
	UINT uMsg,
	WPARAM wParam,
	LPARAM lParam
); //编写窗口过程函数
//WinMain主函数
int WINAPI WinMain(
	HINSTANCE hInstance, //当前窗口句柄
	HINSTANCE hPrevInstance,//上一次窗口句柄
	LPSTR lpCmdLine,        //命令行
	int nCmdShow       //显示状态

)
{
	//设计一个窗口类
	WNDCLASS wndcls;
	wndcls.cbClsExtra = 0;
	wndcls.cbWndExtra = 0;
	wndcls.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wndcls.hCursor = LoadCursor(NULL, IDC_CROSS);
	wndcls.hIcon = LoadIcon(NULL, IDI_WINLOGO);
	wndcls.hInstance = hInstance;
	wndcls.lpfnWndProc = WinSunProc;
	wndcls.lpszClassName = TEXT("sheng");
	wndcls.lpszMenuName = NULL;
	wndcls.style = CS_HREDRAW | CS_VREDRAW;
	RegisterClass(&wndcls);
	//创建窗口
	HWND hwnd;
	hwnd = CreateWindowA("sheng", "MFC学习第一步", WS_OVERLAPPEDWINDOW, 0, 0, 600, 400, NULL, NULL, hInstance, NULL);

	//显示及刷新窗口
	ShowWindow(hwnd, SW_SHOWNORMAL);
	UpdateWindow(hwnd);

	//定义消息结构体，开始消息循环
	MSG msg;
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return msg.wParam;
}
//编写窗口过程函数
LRESULT CALLBACK WinSunProc(
	HWND hwnd,
	UINT uMsg,
	WPARAM wParam,
	LPARAM lParam
)
{	
	switch (uMsg)
	{
	case WM_CHAR:
		char szChar[20];
		sprintf_s(szChar, "char code is %d", wParam);
		MessageBoxA(hwnd,szChar,"CHAR",0);
		break;
	case WM_LBUTTONDOWN:
		MessageBoxA(hwnd, "mouse clicked", "message", 0);
		HDC hdc;
		hdc = GetDC(hwnd);
		TextOutA(hdc, 0, 50, "程序员之家", strlen("程序员之家"));
		ReleaseDC(hwnd, hdc);
		break;
	case WM_PAINT:
		HDC hDC;
		PAINTSTRUCT ps;
		hDC = BeginPaint(hwnd, &ps);
		TextOutA(hDC, 0, 0, "MFC学习第一步", strlen("MFC学习第一步"));
		EndPaint(hwnd, &ps);

		break;
	case WM_CLOSE:
		if (IDYES == MessageBoxA(hwnd, "是否真的结束？", "messge", MB_YESNO))
		{
			DestroyWindow(hwnd);

		}
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;

	default:
		return DefWindowProc(hwnd, uMsg, wParam, lParam);
	}
	return 0;
}