Is it possible to accept custom command line parameters with Inno Setup

Question

I am preparing an installer with Inno Setup. But I\'d like to add an additional custom (none of the available parameters) command line parameters and would like to get the v

Answer 1

This is the function I wrote, which is an improvement of Steven Dunn's answer. You can use it as:

c:\MyInstallDirectory>MyInnoSetup.exe /myParam="parameterValue"

myVariable := GetCommandLineParam('/myParam');

{ util method, equivalent to C# string.StartsWith }
function StartsWith(SubStr, S: String): Boolean;
begin
  Result:= Pos(SubStr, S) = 1;
end;

{ util method, equivalent to C# string.Replace }
function StringReplace(S, oldSubString, newSubString: String): String;
var
  stringCopy: String;
begin
  stringCopy := S; { Prevent modification to the original string }
  StringChange(stringCopy, oldSubString, newSubString);
  Result := stringCopy;
end;

{ ================================================================== }
function GetCommandlineParam(inParamName: String): String; 
var
   paramNameAndValue: String;
   i: Integer;
begin
   Result := '';

   for i := 0 to ParamCount do
   begin
     paramNameAndValue := ParamStr(i);
     if (StartsWith(inParamName, paramNameAndValue)) then
     begin
       Result := StringReplace(paramNameAndValue, inParamName + '=', '');
       break;
     end;
   end;
end;