CharToASCII

From NSIS Wiki

Author: Mæster (talk, contrib)


Description

This function returns the ASCII code number for a given character.

Requirements

Requires: LogicLib header file.

!define LOGICLIB_STRCMP
!include LogicLib.nsh

How To Use

Syntax

${CharToASCII} $ResultVar "Character"

or

Push "Character"
Call CharToASCII
Pop $ResultVar

Parameters

ResultVar
Variable where the ASCII code is returned. The function returns 0 if no ASCII code was found.
Character
The Character for ASCII conversation

Example

${CharToASCII} $0 "T"  ;$0 = 84

Function Code

!define CharToASCII "!insertmacro CharToASCII" 
 
!macro CharToASCII AsciiCode Character
  Push "${Character}"
  Call CharToASCII
  Pop "${AsciiCode}"
!macroend
 
Function CharToASCII
  Exch $0 ; given character
  Push $1 ; current character
  Push $2 ; current Ascii Code   
 
  StrCpy $2 1 ; right from start
Loop:
  IntFmt $1 %c $2 ; Get character from current ASCII code
  ${If} $1 S== $0 ; case sensitive string comparison
     StrCpy $0 $2
     Goto Done
  ${EndIf}
  IntOp $2 $2 + 1
  StrCmp $2 255 0 Loop ; ascii from 1 to 255
  StrCpy $0 0 ; ASCII code wasn't found -> return 0
Done:         
  Pop $2
  Pop $1
  Exch $0
FunctionEnd
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