Add registry key using function in innosetup

inno-setup

Solution

That happens because you're assigning the value of your `IsServer` variable only at the wizard form initialization. You'd need to read the actual value ideally from your `InstallAsServer` function, thus you can even remove the `IsServer` variable. You might simplify your code to something like this:

[Registry]
Root: HKLM; Subkey: "Software\company\product\Settings"; ValueType: string; ValueName: "IsServer"; ValueData: {code:InstallAsServer}

[Code]
var
  Page: TInputOptionWizardPage;

procedure InitializeWizard;
begin
  Page := CreateInputOptionPage(wpWelcome, 'Install Type', 'Select Install Type',
    'Please select Installation type; If Server click Server else Client', True, 
    False);

  // add items
  Page.Add('Install as Server');
  Page.Add('Install as Client');

  // set initial values (optional)
  Page.Values[0] := True;
  Page.Values[1] := False;
end;

function InstallAsServer(Value: string): string;
begin
  // read the actual value directly from the Page
  if not Page.Values[0] then
    Result := '0'
  else
    Result := '1';    
end;

Problem

Original source