关于EnumJobs...枚举打印机任务的API详细用法！急求。

Question

关于EnumJobs...枚举打印机任务的API详细用法！急求。

Answer 1

我找到了一个例子，大家可以一起看看：http://www.codeproject.com/vb/net/printwatchvbnet.asp?target=print%7CjobHow to monitor a printer queue from VB.NET
By Merrion

Answer 2

bool CPrintList::OperateJob(int index)
{
HANDLE handle;
JOB_INFO_2          *pJobStorage = NULL;
PRINTER_INFO_2       *pPrinterInfo = NULL;
DWORD  cByteNeeded,cByteUsed,nReturned; char buf[256];
DWORD dw = 256;
BOOL isadd = false; if (!m_bselected) return false;    isadd =GetDefaultPrinter(buf,&dw);
    if (!isadd) 
return false ;
    if(!OpenPrinter(buf,&handle,NULL))
    {
          MessageBox(_T("Could not open printer"),_T("Error"),  MB_ICONINFORMATION);
          return false;
    }
if (!GetPrinter(handle, 2, NULL, 0, &cByteNeeded))
{
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
            return false;
}
pPrinterInfo = (PRINTER_INFO_2 *)malloc(cByteNeeded);
       if (!(pPrinterInfo))
           return false;   /* Failure to allocate memory. */    if (!GetPrinter(handle, 2,(LPBYTE)pPrinterInfo, cByteNeeded, &cByteUsed))
       {
           /* Failure to access the printer. */ 
           free(pPrinterInfo);
           pPrinterInfo = NULL;
           return false;
       } if (!EnumJobs(handle, 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);  if (!EnumJobs(handle,0,pPrinterInfo->cJobs, 2,(LPBYTE)pJobStorage, cByteNeeded,(LPDWORD)&cByteUsed,(LPDWORD)&nReturned))
       {
           free(pPrinterInfo);
           free(pJobStorage);
           pJobStorage = NULL;
           pPrinterInfo = NULL;
           return false;
       }    if (!nReturned)   //打印队列中没有数据
   {
   free(pPrinterInfo);
           free(pJobStorage);
           pJobStorage = NULL;
           pPrinterInfo = NULL;
   return true; 
   } for (int i = 0; i < (int)nReturned; i++)
{ 
if (m_selectjob.JobID == pJobStorage[i].JobId ) 
{
if (index == 0)
SetJob(handle,pJobStorage[i].JobId,0,NULL,JOB_CONTROL_PAUSE);
else if (index == 1)
SetJob(handle,pJobStorage[i].JobId,0,NULL,JOB_CONTROL_RESTART);
else if (index == 2)
SetJob(handle,pJobStorage[i].JobId,0,NULL,JOB_CONTROL_DELETE);
else if (index == 3)
SetJob(handle,pJobStorage[i].JobId,0,NULL,JOB_CONTROL_RESUME);
break;
}
}
        free(pPrinterInfo);
        free(pJobStorage);
pPrinterInfo = NULL;
pJobStorage = NULL;
m_bselected  = false;
   return true;