用线程实现动态改变图标

用线程实现动态改变图标
作者：cj_ict

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前几天看了一个《如何在标题栏中显示动态图标》文章，作者为重庆建设集团一所 唐星彬。觉得用SetTimer实现起来麻烦，且占用资源。手头一痒将其改为线程实现，并且把线程封装在类里。使用简单，不需要设置SetTimer在OnTimer函数里调用。只需直接调用

m_animIcon.SetImageList(IDB_BITMAP_ANIM,6,RGB(0,0,0));m_animIcon.Draw(this);

class CAnimateIcon{protected://创建一个列表变量，用于保存图像列　CImageList m_imgList;//当前图像序号int m_iImageCounter;//图像总数int m_nMaxNumOfImages;//关闭线程bool m_bExit;   //拥有图标的窗口的窗口类指针CWnd * m_pWnd;//图标刷新间隔DWORD m_dwMilliseconds;public:void ChangeInterval(DWORD dwTimes);//改变图标刷新时间间隔BOOL Draw(CWnd *pWnd,DWORD dwTimes=1000);CAnimateIcon();~CAnimateIcon();bool SetImageList(int IDOfImageListResource,int numberOfImages,COLORREF transparentColor);protected:static UINT WINAPI _ThreadAnimation(LPVOID pParam);};BOOL CAnimateIcon::Draw(CWnd *pWnd,DWORD dwTimes){//拥有图标的窗口的窗口类指针m_pWnd=pWnd;ASSERT(m_pWnd);//图标刷新间隔m_dwMilliseconds=dwTimes;unsigned int nDummy;//注意：传递给线程本实例的指针HANDLE hThread = (HANDLE) _beginthreadex(NULL,0,_ThreadAnimation,this,CREATE_SUSPENDED,&nDummy);if (!hThread){TRACE(_T("Draw: Couldn''t start a ICON animation threadn"));return false;} else {ResumeThread(hThread);}CloseHandle(hThread);//不再需要线程句柄，将其关闭return true;}UINT WINAPI CAnimateIcon::_ThreadAnimation(LPVOID pParam){//从传递过来的实例指针，可以操作不同的实例，//注意线程函数是唯一和静态的。CAnimateIcon &p=*(CAnimateIcon *)pParam;while(!p.m_bExit){if(p.m_imgList.m_hImageList==NULL)return 0;p.m_iImageCounter++;if(p.m_iImageCounter>=p.m_nMaxNumOfImages)p.m_iImageCounter=0;HICON hIcon=p.m_imgList.ExtractIcon(p.m_iImageCounter);HICON hPrevIcon=(HICON)p.m_pWnd->SetIcon(hIcon,false);DestroyIcon(hPrevIcon);Sleep(p.m_dwMilliseconds);}return 1;}