Calling an ANSI string DLL from Unicode NSIS

[will49]

I have a legacy custom DLL that I need to call from my installer that uses ANSI character strings for parameters. Now I want to move to using the Unicode version of NSIS v3, but I can't easily recompile the DLL to support wide characters.

I've been searching for a way to pass single byte strings to and from the DLL and then convert to Unicode for use within NSIS, but I haven't found a clear answer.

Is "CallAnsiPlugin" any use for what I need? The sample code is pretty unclear to me.

Any pointers are much appreciated.

[Afrow UK]

The CallAnsiPlugin plug-in is what you need to use. What is not clear from the example?

Stu

[will49]

Maybe it's best to show what I had been using before with my DLL:

code:
   StrCpy $0 ${NSIS_MAX_STRLEN}          ; assign memory to $0

   System::Call '$TEMP\${TMP_SUB_DIR}\MYCUSTOMDLL::GetString(t) i(.r0) .r1'

   MessageBox MB_OK|MB_ICONEXCLAMATION $0

How would I accomplish the same thing with CallAnsiPlugin? Maybe something like this?

code:
CallAnsiPlugin::Call "$TEMP\${TMP_SUB_DIR}\MYCUSTOMDLL" GetString 1 $0

[will49]

I should point out that my dll is not an NSIS plugin DLL. It's just a plain Win32 DLL that copies a string into the parameter.

[Anders]

CallAnsiPlugin only works for NSIS plugins.

The System plugin will work, you just have to use the correct string type and in your case just change (t) to (m).

m = char*
w = wchar_t*
t = TCHAR* / LPTSTR

[will49]

Wow that is perfect! Thanks! I like those simple kinds of fixes

[taichismith]

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