VC++实现输出GIF到窗体并显示GIF动画的方法

//加载GIF文件
void COutputGIFDlg::OnBrowse()
{
 CFileDialog flDlg(TRUE, "", "", OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
   "GIF|*.gif;||");//定义文件打开对话框
 if (flDlg.DoModal() == IDOK)
 {
 CString szText;
 szText = flDlg.GetPathName();
 m_FileName.SetWindowText(szText);
 m_pBmp = Bitmap::FromFile(szText.AllocSysString()); //加载GIF图像
 szText.ReleaseBuffer();
 m_nCount = m_pBmp->GetFrameDimensionsCount(); //获取帧维数
 GUID *pGuids = new GUID[m_nCount]; //定义一个GUID数组
 m_pBmp->GetFrameDimensionsList(pGuids,m_nCount); //获取图像帧的GUID
 m_FrameCount = m_pBmp->GetFrameCount(pGuids); //获取GIF帧数
 UINT nSize; //定义一个整型变量
 m_nCount = 0; //初始化成员变量
 m_pBmp->GetPropertySize(&nSize, &m_nDelay); //获取属性大小
 PropertyItem *pItem = NULL; //定义属性指针
 pItem = (PropertyItem*)malloc(nSize); //为属性指针分配合适的空间
 m_pBmp->GetAllPropertyItems(nSize, m_nDelay, pItem);//获取属性信息
 m_nDelay = ((long*)pItem->value)[0]; //获取第一帧的延时
 free(pItem); //释放属性对象
 delete [] pGuids; //释放GUID
 m_nIndex = 0; //初始化成员变量
 KillTimer(1);
 SetTimer(1, 300, NULL);
 }
}
void COutputGIFDlg::OnTimer(UINT nIDEvent)
{
 GUID Guid = FrameDimensionTime; //定义一个GUID
 CDC* pDC = GetDC(); //获取窗口的设备上下文
 //定义一个内存画布
 CMemDC dc(pDC, CRect(20, 50, m_pBmp->GetWidth()+20, m_pBmp->GetHeight()+50));
 Graphics gh(dc.m_hDC); //定义一个图像对象
 //向设备上下文中绘制图像
 gh.DrawImage(m_pBmp, 0, 0, m_pBmp->GetWidth(), m_pBmp->GetHeight());
 m_pBmp->SelectActiveFrame(&Guid, m_nIndex++);//设置下一帧
 if(m_nIndex == m_FrameCount) //判断当前帧是否为尾帧
  m_nIndex = 0; //将当前帧设置为第一帧
 CDialog::OnTimer(nIDEvent);
}
void COutputGIFDlg::OnCancel()
{
 if (m_pBmp != NULL)
 {
 delete m_pBmp;
 m_pBmp = NULL;
 }
 CDialog::OnCancel();
}