请问如何用VB或DEPHI后台监测是否有打印任务传到打印机？

Question

应该用api函数，但我没试过，查查这方面的资料吧

Answer 1

得到当前打印任务队列以及任务状态，你只要循环检测测队列中的各任务，然后判断(pJobStorage[i].Status == JOB_STATUS_PRINTED)是否打印完成，接下来就处理自己的事情就是了。注意怎样使用API函数EnumJobs得到JOB_INFO_2结构以及怎样使用API函数GetPrinter得到PRINTER_INFO_2结构。
以下是MSDN例程：
   BOOL GetJobs(HANDLE hPrinter,        /* handle to the printer */
                JOB_INFO_2 **ppJobInfo, /* pointer to be filled  */
                int *pcJobs,            /* count of jobs filled  */
                DWORD *pStatus)         /* print Queue status    */
   {
       DWORD               cByteNeeded,
                           nReturned,
                           cByteUsed;
       JOB_INFO_2          *pJobStorage = NULL;
       PRINTER_INFO_2       *pPrinterInfo = NULL;   /* Get the buffer size needed */
       if (!GetPrinter(hPrinter, 2, NULL, 0, &cByteNeeded))
       {
           if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
               return FALSE;
       }       pPrinterInfo = (PRINTER_INFO_2 *)malloc(cByteNeeded);
       if (!(pPrinterInfo))
           /* failure to allocate memory */
           return FALSE;       /* get the printer info */
       if (!GetPrinter(hPrinter,
               2,
               (LPSTR)pPrinterInfo,
               cByteNeeded,
               &cByteUsed))
       {
           /* failure to access the printer */
           free(pPrinterInfo);
           pPrinterInfo = NULL;
           return FALSE;
       }       /* Get job storage space */
       if (!EnumJobs(hPrinter,
               0,
               pPrinterInfo->cJobs,
               2,
               NULL,
               0,
               (LPDWORD)&cByteNeeded,
               (LPDWORD)&nReturned))
       {
           if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
           {
               free(pPrinterInfo);
               pPrinterInfo = NULL;
               return FALSE;
           }
       }       pJobStorage = (JOB_INFO_2 *)malloc(cByteNeeded);
       if (!pJobStorage)
       {
           /* failure to allocate Job storage space */
           free(pPrinterInfo);
           pPrinterInfo = NULL;
           return FALSE;
       }       ZeroMemory(pJobStorage, cByteNeeded);       /* get the list of jobs */
       if (!EnumJobs(hPrinter,
               0,
               pPrinterInfo->cJobs,
               2,
               (LPBYTE)pJobStorage,
               cByteNeeded,
               (LPDWORD)&cByteUsed,
               (LPDWORD)&nReturned))
       {
           free(pPrinterInfo);
           free(pJobStorage);
           pJobStorage = NULL;
           pPrinterInfo = NULL;
           return FALSE;
       }       /*
        *  Return the information
        */
       *pcJobs = pPrinterInfo->cJobs;
       *pStatus = pPrinterInfo->Status;
       *ppJobInfo = pJobStorage;
       free(pPrinterInfo);       return TRUE;
   }