学步园

学习了很久的孙鑫老师的第一课了，今天把笔记补上！

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

//声明回调函数
LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);

//程序执行的入口点Main函数
int WINAPI WinMain(
  HINSTANCE hInstance,      // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,          // command line
  int nCmdShow              // show state
)
{
	WNDCLASS wndcls;  //定义一个windows窗口类，并且用下面的代码给这个wndcls赋值
	wndcls.cbClsExtra=0;
	wndcls.cbWndExtra=0;
	wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
	wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
	wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
	wndcls.hInstance=hInstance;
	wndcls.lpfnWndProc=WinSunProc; //绑定窗口回调函数
	wndcls.lpszClassName="Weixin2003";
	wndcls.lpszMenuName=NULL;
	wndcls.style=CS_HREDRAW | CS_VREDRAW;
	RegisterClass(&wndcls);  //注册这个窗口类
	HWND hwnd;               //定义一个窗口句柄
	hwnd=CreateWindow("Weixin2003","北京维新科学技术培训中心",WS_OVERLAPPEDWINDOW,
		0,0,600,400,NULL,NULL,hInstance,NULL);
	ShowWindow(hwnd,SW_SHOWNORMAL);  //显示这个窗口
	UpdateWindow(hwnd);              //更新这个窗口

         //不过这里去掉UpdateWindow对程序没有多大影响

	MSG msg; //定义消息对象
	while(GetMessage(&msg,NULL,0,0)) //消息循环
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return 0;
}


LRESULT CALLBACK WinSunProc(      //窗口回调函数的定义
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)

{
	switch(uMsg)
	{
	case WM_CHAR:  //如果消息是字符消息
		char szChar[20];
		sprintf(szChar,"char is %d",wParam);
		MessageBox(hwnd,szChar,"weixin",0);
		break;

	case WM_LBUTTONDOWN:
		MessageBox(hwnd,"mouse clicked","weixin",0);
		HDC hdc;
		hdc=GetDC(hwnd);
		TextOut(hdc,0,50,"计算机编程语言培训",strlen("计算机编程语言培训"));
		ReleaseDC(hwnd,hdc);
		break;

	case WM_PAINT:
		HDC hDC;
		PAINTSTRUCT ps;
		hDC=BeginPaint(hwnd,&ps);
		TextOut(hDC,0,0,"维新培训",strlen("维新培训"));
		EndPaint(hwnd,&ps);
		break;

	case WM_CLOSE:
		if(IDYES==MessageBox(hwnd,"是否真的结束？","weixin",MB_YESNO))
		{
			DestroyWindow(hwnd);
		}
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hwnd,uMsg,wParam,lParam);
	}
	return 0;
}