pdfium调用

FPDF_InitLibrary();
     FPDF_DOCUMENT outdoc;
      string inpdf = "/home/lyd/work/gnpdf/441.pdf";
 
 
             outdoc = FPDF_CreateNewDocument();
             FPDF_PAGE page = FPDFPage_New(outdoc, 0, 612, 792);
 
             FPDF_PAGEOBJECT green_path = FPDFPageObj_CreateNewPath(20, 20);
                FPDFPath_SetFillColor(green_path, 0, 255, 0, 200);
                // TODO(npm): stroking will cause the MD5s to differ.
              FPDFPath_SetDrawMode(green_path, FPDF_FILLMODE_WINDING, 0);
               FPDFPath_LineTo(green_path, 20, 63);
                FPDFPath_BezierTo(green_path, 55, 55, 78, 78, 90, 90);
                FPDFPath_LineTo(green_path, 133, 133);
              FPDFPath_LineTo(green_path, 133, 33);
                FPDFPath_BezierTo(green_path, 38, 33, 39, 36, 40, 40);
                FPDFPath_Close(green_path);
                FPDFPage_InsertObject(page, green_path);
 
             string filename2 = "/home/lyd/work/gnpdf/me.pdf";
             int fp = open(filename2.c_str(), O_RDWR|O_CREAT);
             PdfToFdWriter writer;
             writer.version = 1;
             writer.dstFd = fp;
             writer.WriteBlock = &writeBlock;
            FPDF_SaveAsCopy(outdoc, &writer, FPDF_NO_INCREMENTAL);
 
            FPDF_CloseDocument(outdoc);
             close(fp);
 
         FPDF_DestroyLibrary();