Detecting color depth-16 color, 256 color, or 32 bit color

[TerryRitchie]

Terry,

Since you are error trapping, isn't this line redundant?

IF i > -2 THEN EXIT FUNCTION

Pete

Yep, sure is. But in the other thread RhoSigma made a good point about how using ON ERROR the way I am will not preserve any previous ON ERROR label that may have existed. It looks like I'll need to remove the .BI file and ON ERROR statement completely any way.

As I said in the other thread, what is really needed is a way to verify that image handles are valid.

_VALIDIMAGE(Handle&)

or something similar. Image handles can't exist above -2 but there is no way to check if a number within the valid handle range actually contains an image. This would be useful for another reason too. When you free an image (_FREEIMAGE) any associated variable that contains the handle value still retains that value. I've made it a habit after freeing an image to also set any associated variable to -1.

_FREEIMAGE(MySprite&)
MySprite& = -1

This way checks for -2 or less will catch this as an invalid image handle since it was previously removed.