keycontrol.cpp

c++从入门到精通

#include <windows.h>
#include <stdlib.h>
#include <string.h>

long WINAPI WndProc(HWND hWnd,
					UINT iMessage,
					UINT wParam,
					LONG lParam);//消息处理函数声明.

BOOL InitWindowsClass(HINSTANCE hInstance);//初始化窗口类声明
BOOL InitWindows(HINSTANCE hInstance, int nCmdShow);//初始化窗口声明.
RECT rect;				//定义矩形结构体.记录了图形的信息.

int WINAPI WinMain(HINSTANCE hInstance,
				   HINSTANCE hPrevInstance,
				   LPSTR lpCmdLine,
				   int nCmdShow)//主函数
{
	MSG Message;
	if(!InitWindowsClass(hInstance))//初始化窗口类.
		return FALSE;
	if(!InitWindows(hInstance,nCmdShow))//初始化窗口.
		return FALSE;
	while(GetMessage(&Message,0,0,0))
	{
		TranslateMessage(&Message);	//消息循环.
		DispatchMessage(&Message);
	}
	return Message.wParam;
}

long WINAPI WndProc(HWND hWnd,
					UINT iMessage,
					UINT wParam,
					LONG lParam)//消息处理函数.
{
	HDC hDC;				//定义设备环境句柄.
 	PAINTSTRUCT ps;	//定义绘图结构体变量.
	static int  cxClient, cyClient ;

	switch(iMessage)
	{
	case WM_SIZE:
          cxClient = LOWORD (lParam) ;//客户区的宽度
          cyClient = HIWORD (lParam) ;//客户区的高度
		  rect.left=cxClient/2-20;
		  rect.top=cyClient/2-20;
		  rect.bottom=cyClient/2+20;
		  rect.right=cxClient/2+20;
		  return 0 ;

	case WM_KEYDOWN:
	{
		switch(wParam)
		{
		case VK_UP://当按上箭头键时，矩形向上增加10
			rect.top-=10;
			break;
		case VK_DOWN://当按下箭头键时，矩形向下增加10
			rect.bottom+=10;
			break;
		case VK_LEFT://当按左箭头键时，矩形向左增加10
			rect.left-=10;
			break;
		case VK_RIGHT://当按右箭头键时，矩形向右增加10
			rect.right+=10;
			break;
		default:
			break;
		}
	}
	case WM_KEYUP:
		InvalidateRect(hWnd,NULL,FALSE);//刷新用户区。
		break;

	case WM_PAINT:
		hDC = BeginPaint(hWnd,&ps);
		//绘制矩形.
		Rectangle(hDC,rect.left,rect.top,rect.right,rect.bottom);
		EndPaint(hWnd,&ps);
		break;
	
	case WM_DESTROY://退出窗口.
		PostQuitMessage(0);
		return 0;
	
	default:
		return(DefWindowProc(hWnd,iMessage,wParam,lParam));
	}
	return 0;
}

BOOL InitWindows(HINSTANCE hInstance, int nCmdShow)
{
	HWND hWnd;
	hWnd=CreateWindow("keyTest",			//窗口类名称.
					"键盘键测试小程序",		//标题栏名称.
					WS_OVERLAPPEDWINDOW,	//窗口样式.有标题栏和最大最小化按钮.
					CW_USEDEFAULT,			//窗口左上角坐标.
					0,
					CW_USEDEFAULT,			//采用缺省的高度和宽度.
					0,
					NULL,					//无父窗口.
					NULL,					//无菜单.
					hInstance,				//当前应用实例句柄.
					NULL);					//指向传递给窗口的参数的指针
	if(!hWnd)		//创建失败.
		return FALSE;
	ShowWindow(hWnd,nCmdShow);	//显示窗口.
	UpdateWindow(hWnd);			//刷新用户区.
	return TRUE;
}

BOOL InitWindowsClass(HINSTANCE hInstance)
{
	WNDCLASS WndClass;

	WndClass.cbClsExtra=0;			//无窗口类扩展.
	WndClass.cbWndExtra=0;			//无窗口实例扩展.
	//背景为白色.
	WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH));
	WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);//光标为为箭头.
	WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);//采用缺省图标.
	WndClass.hInstance=hInstance;//当前实例.
	WndClass.lpfnWndProc=WndProc;//消息处理函数.
	WndClass.lpszClassName="keyTest";//窗口类名称.
	WndClass.lpszMenuName=NULL;//无菜单.
	WndClass.style=0;//缺省窗口风格.
	return RegisterClass(&WndClass);//返回窗口注册值.
}