simple DllCall question

[bigdeal]

I was looking at helpfile to learn ahk and it says that this would be uppercase and the next should be lowercase, however I tried it and it was both lowercase, so I dunno if this is my mistake or a mistake in the helpfile?

MyVar = ABC
result := DllCall("CharLower", str, DllCall("CharUpper", Str, MyVar, Str), Str)

MyVar = ABC
result := DllCall("CharLower", ptr, DllCall("CharUpper", Str, MyVar, Ptr), Str)

[Xtra]

Examples:

Code: Select all

MyVar = ABC

StringLower, MyVar, MyVar
MsgBox,, StringLower, % MyVar

StringUpper, MyVar, MyVar
MsgBox,, StringUpper, % MyVar

MyVar := Format("{:L}", MyVar)
MsgBox,, Format {:L}, % MyVar

MyVar := Format("{:U}", MyVar)
MsgBox,, Format {:U}, % MyVar

DllCall("CharLower", Ptr, &MyVar)
MsgBox,, DllCall CharLower, % MyVar

DllCall("CharUpper", Ptr, &MyVar)
MsgBox,, DllCall CharUpper, % MyVar

References:
https://msdn.microsoft.com/en-us/librar ... s.85).aspx
https://msdn.microsoft.com/en-us/librar ... s.85).aspx

HTH

[lexikos]

bigdeal, I believe you misread the help file.

But when the same is done with DllCall(), MyVar would be uppercase after the following call because CharLower would have operated on a different/temporary string whose contents were identical to MyVar:

MyVar (the input/output of CharUpper) and result (the return value of CharLower) are not the same thing.