Reverse string Dllcall not working anymore? Topic is solved

[brutus_skywalker]

So i was going over https://autohotkey.com/board/topic/4239 ... e-a-string, and i can't figure out why NON of the DllCall's seem to work, the thing is i recall using some of these,but they just don't seem to work anymore.

Any Ideas as to why?

[Win7x64-Ultimate]

Code: Select all

MsgBox, % DllCall("msvcrt.dll\_strrev", "str", "autohotkey", "cdecl str")

MsgBox, % DllCall( "msvcrt.dll\_strrev", Str,"autohotkey", UInt,0, Str )

var = autohotkey
MsgBox, % DllCall( "msvcrt.dll\_strrev", Str,var, UInt,0, Str )

[Flipeador]

you are using the "ANSI" (for UTF-8 strings) version...

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; https://msdn.microsoft.com/en-us/library/9hby7w40.aspx
MsgBox % DllCall("msvcrt.dll\_wcsrev", "Str", "AutoHotkey", "CDecl Str")

var := "autohotkey"
MsgBox % DllCall("msvcrt.dll\_wcsrev", "UPtr", &var, "CDecl Str")

[brutus_skywalker]

you are using the ANSI version...

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; https://msdn.microsoft.com/en-us/library/9hby7w40.aspx
MsgBox % DllCall("msvcrt.dll\_wcsrev", "Str", "AutoHotkey", "CDecl Str")

var := "autohotkey"
MsgBox % DllCall("msvcrt.dll\_wcsrev", "UPtr", &var, "CDecl Str")

Yeah, that was stupid of me, i didn't notice, just checked the msdn. SORRY.

[Flipeador]

No using Unicode, those were some of the examples i tried from the linked page.

It was not a question. I was referring to _strrev, not AHK. The above code works perfectly for me.

[Flipeador]

Code: Select all

String := "AutoHotkey"

Size := StrPut(String, "UTF-8")
VarSetCapacity(Buffer, Size)
StrPut(String, &Buffer, "UTF-8")

MsgBox % DllCall("msvcrt.dll\_strrev", "UPtr", &Buffer, "CDecl AStr")

[brutus_skywalker]

Apiologies, just checked msdn. My Bad!

[Helgef]

You can do "astr", str. Also note that you reverse the input string, so using "(a)str" for the return is unnecessary. If you want to preserve the input you can pass str . "" (and then use "(a)str" for the return)

Cheers.

[Flipeador]

Also note that you reverse the input string, so using "(a)str" for the return is unnecessary.

You can do "astr", str

True

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var := "AutoHotkey"
DllCall("msvcrt.dll\_wcsrev", "UPtr", &var, "CDecl")
MsgBox % var

Code: Select all

; but you can't use UPtr
MsgBox % DllCall("msvcrt.dll\_strrev", "AStr", "autohotkey", "CDecl AStr")

If you want to preserve the input you can passstr . "" (and then use "(a)str" for the return)

How is that?

[Helgef]

How is that?

str . "" results in a temporary string, not a variable reference. So "astr", str . "" passes the address of a temporary string, while "astr", str passes the address of str.

In v2 we can do "ptr", &(str . "")

Cheers.

Edit, maybe more intuitive, you can do "ptr", &revStr := str to preserve it.

[Flipeador]

ah!, yeah, I do not know what I had tried that did not work for me.
Yes, passing directly the memory address is faster.
In v2 we can do..