Inno Setup conditional restart based on result of executable call

Question

My Inno Setup script is used to install a driver. It runs my InstallDriver.exe after this file was copied during step ssInstall.

I need to

Answer 1

NeedRestart does not look like the right place to install anything. But it would work, as it's fortunately called only once. You will probably want to present a progress somehow though, as the wizard form is almost empty during a call to NeedRestart.

---

An alternative is to use AfterInstall parameter of the InstallDriver.exe or the driver binary itself (whichever is installed later).

#define InstallDriverName "InstallDriver.exe"

[Files]
Source: "driver.sys"; DestDir: ".."
Source: "{#InstallDriverName}"; DestDir: "{app}"; AfterInstall: InstallDriver

[Code]
var
  NeedRestartFlag: Boolean;

const
  NeedRestartResultCode = 1;

procedure InstallDriver();
var
  InstallDriverPath: string;
  ResultCode: Integer;
begin
  Log('Installing driver');
  InstallDriverPath := ExpandConstant('{app}') + '\{#InstallDriverName}';
  if not Exec(InstallDriverPath, 'I', '',  SW_HIDE, ewWaitUntilTerminated, ResultCode) then
  begin
    Log('Failed to execute driver installation');
  end
    else
  begin
    Log(Format('Driver installation finished with code %d', [ResultCode]))
    if ResultCode = NeedRestartResultCode then
    begin
      Log('Need to restart to finish driver installation');
      NeedRestartFlag := True;
    end;
  end;
end;

function NeedRestart(): Boolean;
begin
  if NeedRestartFlag then
  begin
    Log('Need restart');
    Result := True;
  end
    else
  begin
    Log('Do not need restart');
    Result := False;
  end;
end;