Inno Setup Function - Invalid Prototype [duplicate] - inno-setup

Question

This question already has an answer here:
"Identifier Expected" or "Invalid Prototype" when implementing a scripted constant in Inno Setup
(1 answer)
Closed 1 year ago.
I'm using Inno Setup for my installation and am adding the following function to the existing [Code] section:
function Get64Or32: String;
begin
if IsWin64 then
begin
Result := 'Program Files (x86)';
end
else
begin
Result := 'Program Files';
end;
end;
I keep getting the following error:
10:41:08 Invalid prototype for 'Get64Or32'
I have tried several permutations including having the parenthesis after the function name but get the same error each time.
I'm attempting to use this from the [Registry] section to pinpoint the Java location:
Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"; ValueType:string; ValueName:"JRE_HOME"; ValueData:"C:\{code:Get64or32}\Java\jre_1.8.0_151"; Flags: preservestringtype uninsdeletevalue uninsdeletekeyifempty; Permissions: users-modify;

Answer 1

If you look here Pascal Scripting: Scripted Constants it explains it all. To quote:
The syntax of a {code:...} constant is: {code:FunctionName|Param}
The Pascal script can contain several functions which are called when
Setup wants to know the value of a scripted {code:...} constant. The
called function must have 1 String parameter named Param, and must
return a String or a Boolean value depending on where the constant is
used.
The syntax of a {code:...} constant is: {code:FunctionName|Param}
It also provides:
An example function:
[Code]
function MyConst(Param: String): String;
begin
Result := ExpandConstant('{autopf}');
end;
An example useage:
[INI]
FileName: "{app}\MyIni.ini"; Section: "MySettings"; Key: "ShortApp"; String: "{code:GetShortName|{app}}"
You don't have to use the parameter but it must be part of the prototype.