remove last words from InstallDirRegKey and then use that

hi
i have a problem with InstallDirRegKey and InstallDir,i use from InstallDirRegKey for installation patch in my application and read a address from reg: "HKEY_CURRENT_USER\Software\RoseSoftwares\CarRepairShop\" "ExePath" and in ExePath is this: "C:\Program Files\Rose\CarRepairShop\RepairShop.exe" now i want remove "RepairShop.exe" from address and use that address Sample this: "C:\Program Files\Rose\CarRepairShop\" for InstallDirRegKey.
i how can do it?!
thanks

thanks
i found a solution:

page directory

page instfiles



function RegsKeys

ReadRegStr $0 HKCU Software\RoseSoftwares\CarRepairShop "ExePath"

;in String Exepath is address "C:\Program Files\Rose\CarRepairShop\RepairShop.exe"

functionend



Section "Install Application Dll Files Need"

SetOutPath "$INSTDIR"

File RosePlug.Dll

File ClPack.Dll

SectionEnd



Function .onInit

call RegsKeys

StrCpy $INSTDIR $0 -14

FunctionEnd

and another question:
is possible i split "C:\Program Files\Rose\CarRepairShop\RepairShop.exe" by \ character?\
finally change to "C:\Program Files\Rose\CarRepairShop\" by split? something like StrCpy $INSTDIR $0 -14

i have a question About split string...
i have string: (C:\Program Files\Rose\CarRepairShop\RepairShop.exe) in a variable.
now i want split this string by \ and remove the last \ after.
In the end change that string to (C:\Program Files\Rose\CarRepairShop\)
is possible this?how?
thanks

All string operations can be implemented with strlen+strcpy+strcmp. Have you looked at some of the standard NSIS headers? WordFunc etc. If you cannot find what you are looking for you might have to write your own function...

thanks
i use from StrStr+StrLen+StrCpy , are you think this code have problem? and think this way for solve problem is bad?

!define StrStr "!insertmacro StrStr"

 

!macro StrStr ResultVar String SubString

  Push '${String}'

  Push '${SubString}'

  Call StrStr

  Pop '${ResultVar}'

!macroend

 

Function StrStr

/*After this point:

  ------------------------------------------

  $R0 = SubString (input)

  $R1 = String (input)

  $R2 = SubStringLen (temp)

  $R3 = StrLen (temp)

  $R4 = StartCharPos (temp)

  $R5 = TempStr (temp)*/

 

  ;Get input from user

  Exch $R0

  Exch

  Exch $R1

  Push $R2

  Push $R3

  Push $R4

  Push $R5

 

  ;Get "String" and "SubString" length

  StrLen $R2 $R0

  StrLen $R3 $R1

  ;Start "StartCharPos" counter

  StrCpy $R4 1

  ;Loop until "SubString" is found or "String" reaches its end

  loop:

    ;Remove everything before and after the searched part ("TempStr")

    StrCpy $R5 $R1 $R2 $R4

    ;Compare "TempStr" with "SubString"

    StrCmp $R5 $R0 done

    ;If not "SubString", this could be "String"'s end

    IntCmp $R4 $R3 done 0 done

    ;If not, continue the loop

    IntOp $R4 $R4 - 1

    Goto loop

  done:

/*After this point:

  ------------------------------------------

  $R0 = ResultVar (output)*/

  ;Remove part before "SubString" on "String" (if there has one)

  StrCpy $R0 $R1 '' $R4

  ;Return output to user

  Pop $R5

  Pop $R4

  Pop $R3

  Pop $R2

  Pop $R1

  Exch $R0

FunctionEnd













Section

StrCpy $1 "C:\Program Files\Rose\CarRepairShop\RepairShop.exe"

MessageBox MB_OK "$1"





${StrStr} $0 "$1" "\"

StrLen $3 $0

StrCpy $4 $1 -$3

MessageBox MB_OK "$4\"

SectionEnd

Things that you might find in the manual:

E.1.15 GetParent
Get parent directory.

Syntax:

${GetParent} "[PathString]" $var

Example:

!include "FileFunc.nsh"

Section

	${GetParent} "C:\Program Files\Winamp\uninstwa.exe" $R0

	; $R0="C:\Program Files\Winamp"

SectionEnd

Thanks demiller9
Solve my problem with you're help