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From the 12.5 Powerbuilder Help on this method:
Converts pixels to PowerBuilder units. Because pixels are not usually square, you also specify whether you are converting the pixels' horizontal or vertical measurement.

Syntax

PixelsToUnits ( pixels, type )

Argument Description
pixels An integer whose value is the number of pixels you want to convert to PowerBuilder units.
type A value of the ConvertType enumerated datatype value indicating how to convert the value:
· XPixelsToUnits! - Convert the pixels in the horizontal direction.
· YPixelsToUnits! - Convert the pixels in the vertical direction.
Return value

Integer. Returns the converted value if it succeeds and -1 if an error occurs. If any argument's value is null, PixelsToUnits returns null.

Note the return value of integer. If you are using this method to say, calculate the width of a string field, the results can easily exceed the maximum value of a Powerbuilder integer which is 32767. To correct for this you will need to do something like:.

integer li_width, li_width_factor
long ll_width
// calculate the width of a single pixel
li_width_factor = PixelsToUnits(1, XPixelsToUnits!) 
// use the calculated factor to obtain the actual width of a very wide string column
ll_width = li_width * li_width_factor //li width is width in pixels
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