Exec

function Exec(const Filename, Params, WorkingDir: String; const ShowCmd: Integer; const Wait: TExecWait; var ResultCode: Integer): Boolean;

Executes the specified executable or batch file. The Wait parameter specifies whether the function should return immediately or wait until the launched process has termimated or is idle. Returns True if the specified file was executed successfully, False otherwise. If True is returned and Wait is ewWaitUntilTerminated then ResultCode returns the exit code of the process. If False is returned then ResultCode specifies the error that occurred. Use SysErrorMessage(ResultCode) to get a description of the error.

TExecWait is defined as:

TExecWait = (ewNoWait, ewWaitUntilTerminated, ewWaitUntilIdle);

Use the ShellExec function instead if you need to launch a file that is not an executable or batch file.

Do not include quotes in the Filename parameter; the function will add them automatically.

When Setup/Uninstall is running in 64-bit mode, this function disables WOW64 file system redirection when calling CreateProcess.

var
  ResultCode: Integer;
begin
  // Launch Notepad and wait for it to terminate
  if Exec(ExpandConstant('{win}\notepad.exe'), '', '', SW_SHOW,
     ewWaitUntilTerminated, ResultCode) then
  begin
    // handle success if necessary; ResultCode contains the exit code
  end
  else begin
    // handle failure if necessary; ResultCode contains the error code
  end;
end;