printVDPI

Set the vertical print resolution.
[read/write property] printVDPI([out, retval] int *dpi) printVDPI([in] int dpi)
This property sets the vertical print resolution, in dots per inch (DPI).

The horizontal (see printHDPI) and vertical resolutions are typically the same. (There are exceptions, such as some chart printers.)

VB6:
viewer.printHDPI = 300 viewer.printVDPI = 300
printHDPI