pdfPrinterSupportsDuplexingW

Check to see if a printer supports duplex printing (Unicode).
int pdfPrinterSupportsDuplexingW(wchar_t *printerName)
This function returns non-zero if the specified printer supports duplex printing.
C:
if (pdfPrinterSupportsDuplexingW(printerName)) { .... }
pdfPrinterSupportsDuplexing