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();