用podofo给pdf文档添加透明文字水印

废话不多说，直接上代码

void MyWatermark(const char* pszInFilename, const char* pszOutFilename)
{
     PdfMemDocument doc( pszInFilename );
    PdfPainter     painter;
    PdfPage*       pPage;
    PdfRect        rect;
    int            i;
	//PdfShadingPattern pattern;
	int iTotalPages = doc.GetPageCount();
	printf("total pages:%d\n",iTotalPages);
    for(i=0;i<iTotalPages;i++)
    {
        pPage = doc.GetPage( i );
        if( !pPage ) 
        {
            PODOFO_RAISE_ERROR( ePdfError_InvalidHandle );
        }
		painter.SetPage(pPage);
		PdfFont* pFont;
		pFont = doc.CreateFont( "Arial" );
		pFont->SetFontSize(20);
		
		painter.SetFont(pFont);
		//pPage->GetContents()->ToString();
		PdfExtGState	trans( &doc );
		trans.SetFillOpacity( 0.5 );
		trans.SetStrokeOpacity(0.5);
		painter.SetExtGState( &trans );
		painter.SetColor(1,0,1);
#if 1