在Inno Setup中，ewWaitUntilIdle的精確定義是什麼？

Question

由於我的安裝程序的一部分，我需要調用出一個DBMS系統，並關閉它，再後來啓動它。如果該DBMS由於某種原因掛起，我的安裝程序將永久掛起。我打電話Exec能夠將啓動或停止數據庫的命令，我的問題是：

到底是什麼ewWaitUntilIdle的定義是什麼？如果我的命令啓動/停止數據庫永遠不會返回，那麼滿足閒置狀態的條件是什麼？

Answer 1

這是創新科技的來源確切代碼：

procedure HandleProcessWait(ProcessHandle: THandle; const Wait: TExecWait; 
    const ProcessMessagesProc: TProcedure; var ResultCode: Integer); 
begin 
    try 
    if Wait = ewWaitUntilIdle then begin 
     repeat 
     ProcessMessagesProc; 
     until WaitForInputIdle(ProcessHandle, 50) <> WAIT_TIMEOUT; 
    end; 
    if Wait = ewWaitUntilTerminated then begin 
     { Wait until the process returns, but still process any messages that 
     arrive. } 
     repeat 
     { Process any pending messages first because MsgWaitForMultipleObjects 
      (called below) only returns when *new* messages arrive } 
     ProcessMessagesProc; 
     until MsgWaitForMultipleObjects(1, ProcessHandle, False, INFINITE, QS_ALLINPUT) <> WAIT_OBJECT_0+1; 
     { Process messages once more in case MsgWaitForMultipleObjects saw the 
     process terminate and new messages arrive simultaneously. (Can't leave 
     unprocessed messages waiting, or a subsequent call to WaitMessage 
     won't see them.) } 
     ProcessMessagesProc; 
    end; 
    { Get the exit code. Will be set to STILL_ACTIVE if not yet available } 
    if not GetExitCodeProcess(ProcessHandle, DWORD(ResultCode)) then 
     ResultCode := -1; { just in case } 
    finally 
    CloseHandle(ProcessHandle); 
    end; 
end; 

正如你可以看到ewWaitUntilIdle只需使用WaitForInputIdle功能 - 多看這裏：http://msdn.microsoft.com/en-us/library/windows/desktop/ms687022%28v=vs.85%29.aspx