Find dll files in all directories listed in the PATH variable

[TheGrudge]

I need to find a DLL in a list of directories, e.g. in the PATH variable.

PATH = "c:\aaaa;c:\bbbb" etc

I have written a method that reads the registry and splits the string with a STRTOK method I found in the NSIS wiki:

code:
Function readPathVar

	ReadRegStr $0 HKLM "${REG_ENVIRONMENT}" "Path"

	Push $0

	StrCpy $1 $0

	${While} $0 != ""

		Push ";"

		Call StrTok

		Pop $0

		${If} $0 == ""

			FindFirst $2 $3 $0\some.dll

			FindClose $2

			${If} $3 != ""

				${NSD_CB_AddString} $ComboBox "$1"

			${EndIf}

		${Else}

			FindFirst $2 $3 $0\some.dll

			FindClose $2

			${If} $3 != ""

				${NSD_CB_AddString} $ComboBox "$0"

			${EndIf}

		${EndIf}

		Pop $1

		Push $1

	${EndWhile}

FunctionEnd

I works for all items but the last one, so the path "c:\bbbb" is never searched for the dll.
Also it doesn't work if the PATH looks like this:

PATH = "c:\aaaa;;c:\bbbb" etc

The duplicate ';' character will not deliver all tokens in the string.
Isn't there an easy way to split a string in NSIS?
Or is there a plugin that can find a file in a list of directories?

[pengyou]

From the NSIS Users Manual:
http://nsis.sourceforge.net/Docs/AppendixE.html#E.1.2