pdfPrintSetDuplex

Set the duplexing mode.
void pdfPrintSetDuplex(PDFHandle pdf, int type)
This function sets the duplexing mode. Allowed values for type are: pdfPrintResetParams resets this to its default value, which is pdfPrintDuplexDefault.
C:
pdfPrintSetDuplex(pdf, pdfPrintDuplexVert);
pdfPrinterSupportsDuplexing
pdfPrintResetParams