怎么监视打印机？我希望能用HOOK，不知可不可以？

用HOOK可能不行,毕竟HOOK只能处理UI方面的东西关注

那么我该怎么做?要监视WINSPOOL.DRV吗?
为什么GetProcAddress不能对WINSPOOL.DRV作用呢?

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

我是单独的做一个监听线程
然后
做监听处理
不过
用hook我想是可以的
不过
hook我没有用过！

WH_CALLWNDPROC和WH_CALLWNDPROCRET Hooks
WH_CALLWNDPROC和WH_CALLWNDPROCRET Hooks使你可以监视发送到窗口过程的消息。系统在消息发送到接收窗口过程之前调用WH_CALLWNDPROC Hook子程，并且在窗口过程处理完消息之后调用WH_CALLWNDPROCRET Hook子程。
如果某个应用程序调用打印可以用HOOk钩住但是从Print Pool到Printer不知真么监视
DDk不是很熟

打印队列中打印任务发生变化时(添加/删除等状态变化时)
发出消息wm_spoolrestatus
处理该消息
CWnd::OnSpoolerStatus See AlsoThe framework calls this member function from Print Manager whenever a job is added to or removed from the Print Manager queue.afx_msg void OnSpoolerStatus(
   UINT nStatus,
   UINT nJobs
);
不过
我没有这么写
用很笨的办法
线程处理：
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;
}

对了
关于
hookWH_CALLWNDPROC和WH_CALLWNDPROCRET Hooks
WH_CALLWNDPROC和WH_CALLWNDPROCRET Hooks使你可以监视发送到窗口过程的消息。系统在消息发送到接收窗口过程之前调用WH_CALLWNDPROC Hook子程，并且在窗口过程处理完消息之后调用WH_CALLWNDPROCRET Hook子程。怎么用的
给我发一点?
thank you !

当然本机的打印消息我可以通过HOOKAPI StartDoc来搞定,但是非本机的打印请求我只能通过监视打印队列来知道了,有现存的软件(大都用DELPHI写的),但是那位兄台推说太忙不愿透露细节.我现在为难的是怎么可以让系统通知我的程序有打印请求了(详细到页),有打印请求可以通过CHANGE NOTIFICATION 来解决,但是详细到页我不知到如何做,希望大家提供一些别的解决方法.总不能让我HOOK WritePrinter吧.

回复人： isdong(有些事情应该忘记) (☆★☆★☆★☆★) ( ) 信誉：100  2003-1-24 9:29:31  得分:0


Sample Code   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 information. */
       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 = nReturned;
       *pStatus = pPrinterInfo->Status;
       *ppJobInfo = pJobStorage;
       free(pPrinterInfo);       return TRUE;   }   BOOL IsPrinterError(HANDLE hPrinter)
   {       JOB_INFO_2  *pJobs;
       int         cJobs,
                   i;
       DWORD       dwPrinterStatus;       /*
        *  Get the state information for the Printer Queue and
        *  the jobs in the Printer Queue.
        */
       if (!GetJobs(hPrinter, &pJobs, &cJobs, &dwPrinterStatus))
           return FALSE;       /*
        *  If the Printer reports an error, believe it.
        */
       if (dwPrinterStatus &
           (PRINTER_STATUS_ERROR |
           PRINTER_STATUS_PAPER_JAM |
           PRINTER_STATUS_PAPER_OUT |
           PRINTER_STATUS_PAPER_PROBLEM |
           PRINTER_STATUS_OUTPUT_BIN_FULL |
           PRINTER_STATUS_NOT_AVAILABLE |
           PRINTER_STATUS_NO_TONER |
           PRINTER_STATUS_OUT_OF_MEMORY |
           PRINTER_STATUS_OFFLINE |
           PRINTER_STATUS_DOOR_OPEN))
       {
           return TRUE;
       }       /*
        *  Find the Job in the Queue that is printing.
        */
       for (i=0; i < cJobs; i++)
       {
           if (pJobs[i].Status & JOB_STATUS_PRINTING)
           {
               /*
                *  If the job is in an error state,
                *  report an error for the printer.
                *  Code could be inserted here to
                *  attempt an interpretation of the
                *  pStatus member as well.
                */
               if (pJobs[i].Status &
                   (JOB_STATUS_ERROR |
                   JOB_STATUS_OFFLINE |
                   JOB_STATUS_PAPEROUT |
                   JOB_STATUS_BLOCKED_DEVQ))
               {
                   return TRUE;
               }
           }
       }       /*
        *  No error condition.
        */
       return FALSE;   }

ccjerk(岚)大哥:
这段程序中:
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;
index是干什么的?m_selectjob是那儿来的?希望详解,我明白了就结帖.谢谢.

调试易

怎么监视打印机？我希望能用HOOK，不知可不可以？

解决方案 »