Checks to see if Rosetta holds a valid image in its memory buffer.
Usage:
imgIsValid (object me)
Parameters:
None
Returns:
(integer) - The success code
Example:
xtRose = xtra("Rosetta").new( )
xtRose.imgOpen( "C:\windows\winnt.bmp" )
bImgValid = xtRose.imgIsValid( )
Notes:
This function can be helpful to determine if an image could be opened by Rosetta after calling functions such as imgFromClipboard, imgOpen, imgFromMember or imgFromScreen.