MFC入门之---Windows编程基本原理

Windows程序以消息循环为基础，编写Windows程序的基本过程是：1、设计窗口类；2、创建窗口，用变量保存窗口句柄；3、显示及刷新窗口；4、定义消息结构体，开始消息循；5、书写窗口过程函数

#include <windows.h>
#include <stdio.h>

LRESULT CALLBACK WindowProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);


int WINAPI WinMain(  HINSTANCE hInstance,      // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,          // command line
  int nCmdShow              // show state
  )
{
	//设计窗口类
	WNDCLASS wndcls;
	wndcls.cbClsExtra = 0;
	wndcls.cbWndExtra = 0;
	wndcls.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wndcls.hCursor = LoadCursor(NULL, IDC_ARROW);
	wndcls.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wndcls.hInstance = hInstance;
	wndcls.lpfnWndProc = WindowProc;
	wndcls.lpszClassName = "2012";
	wndcls.lpszMenuName = NULL;
	wndcls.style = CS_HREDRAW | CS_VREDRAW;

	RegisterClass(&wndcls);

	//创建窗口，用变量保存窗口句柄

	HWND hwnd;
	hwnd = CreateWindow("2012", "chuan609956435@gmail.com", WS_OVERLAPPEDWINDOW, 
		0, 0, 640, 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;
}


//窗口过程函数

LRESULT CALLBACK WindowProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)
{
	switch(uMsg)
	{
	case WM_CHAR:
		char szChar[20];
		sprintf(szChar, "char code is %d", wParam);
		MessageBox(hwnd, szChar, "char", 0);
		break;
	case WM_LBUTTONDOWN:
		MessageBox(hwnd, "mouse clicked", "message", 0);
		HDC hdc;
		hdc = GetDC(hwnd);
		TextOut(hdc, 0, 50, "2012", strlen("2012"));
		ReleaseDC(hwnd, hdc);
		break;
	case WM_PAINT:
		HDC hDC;
		PAINTSTRUCT ps;
		hDC = BeginPaint(hwnd, &ps);
		TextOut(hDC, 0, 0, "609956435@qq.com", strlen("609956435@qq.com"));
		EndPaint(hwnd, &ps);
		break;
	case WM_CLOSE:
		if (IDYES == MessageBox(hwnd, "是否真的结束？", "message", MB_YESNO))
		{
			DestroyWindow(hwnd);
		}
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hwnd, uMsg, wParam, lParam);
	}

	return 0;
}

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