使用SHBrowseForFolder() 出现0xC0000005非法访问错误

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使用SHBrowseForFolder() 出现0xC0000005非法访问错误：
CString BrowseFolder(HWND hWnd,char* Title,char* DisplayName)
{

acDocManager->lockDocument(curDoc(),AcAp::kWrite,NULL,NULL,true);

TCHAR szPath[MAX_PATH] = _T("");
BROWSEINFO bi;

bi.hwndOwner = hWnd;
bi.pidlRoot = NULL;
bi.lpszTitle = Title;
bi.pszDisplayName = DisplayName;
bi.ulFlags = BIF_RETURNONLYFSDIRS|BIF_USENEWUI;
bi.lpfn = NULL;
bi.lParam = 0;

LPITEMIDLIST pItemIDList=SHBrowseForFolder(&bi);
if( pItemIDList )
{
SHGetPathFromIDList(pItemIDList,szPath) ;

  IMalloc *pMalloc;
  if( SHGetMalloc( &pMalloc ) != NOERROR )
  {
   TRACE( "Failed to get pointer to shells task allocator" ) ;
   return szPath;
  }
  pMalloc->Free( pItemIDList );
  if( pMalloc )
   pMalloc->Release();
}
return szPath;

acDocManager->unlockDocument(curDoc());

}

传给bi.pszDisplayName 的值必须为char*,不能为""，可以是NULL