How to declare an Inno Setup preprocessor variable by reading from a file

Question

Ok I know you can do this in Inno Setup:

#define AppVer \"0.0.11\"

Then use it like

[Setup]
AppVerName={#AppVer}
         


        

Answer 1

In the event you want to do this at the installer's run time (@jachguate's answer covers the other possibility, and is probably the one you're looking for - I'll leave this in case it helps others at some point), you can use it's Pascal Script to do so. Something like this should work:

[Setup]
AppVer={code:MyVersion}

[Files]
// Other files
Source: "YourVersionFile.txt"; DestDir: "{app}"

[Code]
function MyVersion(Param: String): String;
var
  VersionValue: string;
  VersionFile: string;
begin
  // Default to some predefined value.
  Result := '0.0.0';
  VersionFile := '{app}\YourVersionFile.txt';
  if LoadStringFromFile(VersionFile, VersionValue) then
    Result := VersionValue;
end;

See the help file topic "Pascal Scripting" for more information, including a list of the supported built-in functions.