C++实例 单文档模式生成消息窗口和消息响应

#include 
#include "resource.h"
#include  //CArray使用的头文件

class MyDocument:public CDocument
{
public:
	CArray pArray; //记录点轨迹容器

	void AddPoint(CPoint p) //将轨迹点添加到容器里
	{
		pArray.Add(p);
	}

	CPoint GetPoint(int i)
	{
		return pArray[i]; //将轨迹点从容器中取出
	}

	int GetSize()
	{
		return pArray.GetSize(); //获得容器大小
	}

	DECLARE_DYNCREATE(MyDocument) //定义为run-time类别
	DECLARE_MESSAGE_MAP() //声明消息映射
};

IMPLEMENT_DYNCREATE(MyDocument, CDocument) //建立run-time类别
BEGIN_MESSAGE_MAP(MyDocument, CDocument) //建立消息映射
END_MESSAGE_MAP()



class MyView:public CView 
{
public:
	void OnDraw(CDC* pDC) //重写OnDraw虚函数(这个是必须要重写的)
	{
		MyDocument *doc = (MyDocument*)GetDocument(); //获得当前Document控件的指针

		int num = doc->GetSize(); //取得当前轨迹点数
		int i;

		for(i=0;iGetPoint(i); //获得相应点
			pDC->SetPixel(point, RGB(255, 0, 0)); //画点到单文档中
		}
	}

	afx_msg void OnLButtonDown(UINT nFlags, CPoint point)
	{
		SetCapture(); //取得鼠标消息接收权
	}

	afx_msg void OnMouseMove(UINT nFlags, CPoint point)
	{
		if(this==GetCapture())
		{
			CClientDC aDC(this); //建立画布
			aDC.SetPixel(point, RGB(255, 0, 0)); //将点画在画布上
			MyDocument *doc = (MyDocument*)GetDocument(); //取得当前Document控件的指针
			doc->AddPoint(point);//将轨迹点加入到Document控件中

		}
	}

	afx_msg void OnLButtonUp(UINT nFlags, CPoint point)
	{
		ReleaseCapture(); //释放鼠标消息控件权
	}

	DECLARE_DYNCREATE(MyView)
	DECLARE_MESSAGE_MAP()
};

IMPLEMENT_DYNCREATE(MyView, CView)
BEGIN_MESSAGE_MAP(MyView, CView)
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONUP()
END_MESSAGE_MAP()


class MyFrame:public CFrameWnd
{
	DECLARE_DYNCREATE(MyFrame)
	DECLARE_MESSAGE_MAP()
};

IMPLEMENT_DYNCREATE(MyFrame, CFrameWnd)
BEGIN_MESSAGE_MAP(MyFrame, CFrameWnd)
END_MESSAGE_MAP()


class MyApp : public CWinApp
{
public:

	BOOL InitInstance()
	{
		CDocument *doc;
		CSingleDocTemplate * DocTemplate;
		DocTemplate = new CSingleDocTemplate( //单文档初始化
			IDR_MENU1, 
			RUNTIME_CLASS(MyDocument), 
			RUNTIME_CLASS(MyFrame), 
			RUNTIME_CLASS(MyView));
		AddDocTemplate(DocTemplate); //将文件样版加入到应用程序
		doc = DocTemplate->CreateNewDocument(); //建立新文件
		m_pMainWnd = DocTemplate->CreateNewFrame(doc, NULL); //建立新的视窗框架
		DocTemplate->InitialUpdateFrame((CFrameWnd*)m_pMainWnd, doc); //起始化View控件

		m_pMainWnd->ShowWindow(SW_SHOW); //显示视窗

		return true;
	}

};

MyApp a_app;