c++ - 打印到文件案例中的 FindFirstPrinterChangeNotification

Question

我正在尝试监视远程假脱机程序上的作业。我为此使用下面的代码。实际打印某些内容时，会调用 MyChangeCallback 并且我可以正常进行。但是，如果我在打印对话框上勾选“打印到文件”框，我的回调永远不会被调用。即使选择了“打印到文件”，任何想法如何使它工作？

// Callback definition

VOID MyChangeCallback(PVOID lpParameter, BOOLEAN TimerOrWaitFired)
{
   DEBUG("Change notification received");

   HANDLE hChange = *((HANDLE*)lpParameter));

   // Call FindNextPrinterChangeNotification with hChange
   ...
}


int main() {

    HANDLE hPrinter = 0;

    OpenPrinter(L"\\MyPrintServer\\SharedPrinter", &hPrinter, NULL);

    HANDLE hChange = FindFirstPrinterChangeNotification(   hPrinter,  
                                                           PRINTER_CHANGE_ALL, 
                                                           0, 
                                                           NULL);

    HANDLE hNewWaitObj = 0;

    RegisterWaitForSingleObject(    &hNewWait, 
                                    hChange, 
                                    MyChangeCallback,  
                                    (PVOID)&hChange, 
                                    INFINITE, 
                                    WT_EXECUTEDEFAULT);

    // Wait for events

    Sleep(INFINITE);
}