WaitForSingleObject 问题

Question

我能用这个来等待打印消息吗 
就是当有打印发生时,通知我  
用FindFirstPrinterChangeNotification(hPrinter,PRINTER_CHANGE_JOB,0,@pno)
FindNextPrinterChangeNotification(hResult,pdwChange,@pno,Pointer(pinfo));
方法

Answer 1

FFinder := FindFirstPrinterChangeNotification(.........)if WaitForSingleObject(FFinder, 50) = WAIT_OBJECT_0 then 
begin 
  if FindNextPrinterChangeNotification(FFinder, FFlags, nil, Pointer(FNotifyInfo)) then 
  begin 
    ...............
  end; 
end;

Answer 2

参考
http://delphi.ktop.com.tw/board.php?cid=168&fid=917&tid=39028

Answer 3

这个我也写过,不过到WaitForSingleObject(FFinder, 50) 他也不等待啊 ,

Answer 4

然后 FindNextPrinterChangeNotification(FFinder, FFlags, nil, Pointer(FNotifyInfo)) 后,怎么才能取到这次打印的值啊 ???

Answer 5

WaitForSingleObject(FFinder, 50)??等50毫秒而已,很快的呢~

Answer 6

改成WaitForSingleObject(chgObject,INFINITE);了,这次在这等了 
不过有打印发生时,我可以走到FindNextPrinterChangeNotification(FFinder, FFlags, nil, Pointer(FNotifyInfo)) ,但是我怎么能得到我这次的打印信息啊

Answer 7

FindNextPrinterChangeNotification(FFinder,  FFlags,  nil,  Pointer(FNotifyInfo)) 
后 ,如何获取打印的相关信息 ?

Answer 8

这个可以取到吗?>
typedef struct _PRINTER_NOTIFY_INFO {  
    DWORD  Version; 
    DWORD  Flags; 
    DWORD  Count; 
    PRINTER_NOTIFY_INFO_DATA  aData[1]; 
} PRINTER_NOTIFY_INFO; typedef struct _PRINTER_NOTIFY_INFO_DATA {  
    WORD   Type; 
    WORD   Field; 
    DWORD  Reserved; 
    DWORD  Id; 
    union { 
        DWORD  adwData[2]; 
        struct { 
            DWORD  cbBuf; 
            LPVOID pBuf; 
        } Data; 
    } NotifyData; 
} PRINTER_NOTIFY_INFO_DATA; 

Answer 9

WaitForSingleObject(FFinder, INFINITE);