Overwrite the default printer settings(papersize, orientation,scale) of FileMaker via plugin

[hieuhan]

Hi everyone, I'm developing a FileMaker Pro Advance 11 plugin in C++ to dynamically set the papersize, orientation and scale for printing in Windows. I'm using an available component "PrinterSettings.h", "PrinterSettings.cpp" to implement that. However my plugin can only successfully update those settings for the default windows printer and then the default settings of "Print Setup" in the menu "File/Print Setup" always overwrite the values. What should I do to remove the overwritten settings of FileMaker Print Setup? So the print statement in FileMaker always uses the settings updated via my plugin. Thank you in advance.