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Converting characters to upper or lower case

Code:

DECLARE INTEGER CharLower IN user32 STRING @ lpsz
DECLARE INTEGER CharUpper IN user32 STRING @ lpsz
	
lcText = "Jack and Jill went up the hill"

? CharLower (@lcText)
? lcText

? CharUpper (@lcText)
? lcText

Listed functions:

CharLower
CharUpper

Comment:

Both these functions work slower then the native VFP case converting functions. At least I have found them to be slower on my computer comparing their performance on long cycles.

The only reason that I can see in using these functions is passing the parameter by a reference.

Also there may be some flavours from the side of Unicode strings. I"m not sure at this point.