求大神帮忙，mfc中如何用shellexecute调用Windows中的图片查看器查看图片。

BOOL CCanonSettingPage::PictureWindows(CString strPicFile)
{
CString strSystemDir = _T("");
::GetSystemDirectory(strSystemDir.GetBuffer(256), 256);
strSystemDir.ReleaseBuffer(); CString strRundll = strSystemDir + _T("\\rundll32.exe "); CString strParm;
strParm.Format(_T("%s\\shimgvw.dll ImageView_Fullscreen %s"), strSystemDir, strPicFile); ShellExecute(NULL, _T("open"), strRundll, strParm, _T(""), SW_SHOWNORMAL);
return TRUE;
}