pdfSetTextFixedLineSpacing

Set the text line spacing.
void pdfSetTextFixedLineSpacing(double lineSpacing)
This function sets the line spacing, or vertical character pitch, in points. This value is used only in line printer mode; it will be ignored in other modes.

If the line spacing is set to zero (the default value), line printer mode will automatically compute the vertical spacing.

This setting is global - it applies to all PDF handles.

C:
pdfSetTextFixedLineSpacing(10.0);
pdfSetTextFixedPitch
pdfSetTextLinePrinterMode