如何改变CppWebBrowser的Html内容

void __fastcall TForm1::SetHtml( TCppWebBrowser *WebBrowser,AnsiString Html )
{
    IStream *Stream;
    HGLOBAL hHTMLText;
    IPersistStreamInit *psi;

    if( WebBrowser->Document == NULL )
        return;
    hHTMLText = GlobalAlloc( GPTR, Html.Length() + 1 );
    if( 0 == hHTMLText )
    {
        ShowMessage( "GlobalAlloc Error" );
        return;
    }

    CopyMemory( hHTMLText, Html.c_str(), Html.Length() );
    OleCheck( CreateStreamOnHGlobal( hHTMLText, true, &Stream ) );

    try
    {
        OleCheck( WebBrowser->Document->QueryInterface( __uuidof(IPersistStreamInit), (void **)&psi ) );
        try
        {
            OleCheck( psi->InitNew() );
            OleCheck( psi->Load(Stream) );
        }
        catch( ... )
        {
            delete psi;
        }
    }
    catch( ... )
    {
        delete Stream;
    }
    delete psi;
    delete Stream;
}