在Windows操作系统中,可以通过使用Windows API来捕获发送到打印机的数据。具体步骤如下:
调用OpenPrinter函数打开一个打印机句柄。
调用SetPrinter函数设置PRINTER_CHANGE_WRITE_JOB标志,以便在打印作业被写入到打印机队列时接收通知。
在回调函数中,当接收到PRINTER_WRITE_JOB通知时,调用ReadPrinter函数读取打印作业缓冲区中的数据。如果需要修改数据,可以在读取后进行修改。
以下是示例代码:
HANDLE hPrinter;
PRINTER_DEFAULTS pd;
PRINTER_NOTIFY_OPTIONS_TYPE pno[1];
PRINTER_NOTIFY_OPTIONS pnoo;
HANDLE hChange;
DWORD dwRead;
BYTE buffer[4096];
pd.DesiredAccess = PRINTER_ACCESS_ADMINISTER;
pno[0].Type = JOB_NOTIFY_TYPE;
pno[0].Field = 0;
pno[0].Reserved = 0;
pno[0].NotifyData.Data.cbBuf = sizeof(PRINT_NOTIFY_OPTIONS) + sizeof(PRINTER_NOTIFY_OPTIONS_TYPE);
pno[0].NotifyData.Data.pBuf = &pnoo;
pnoo.Version = 2;
pnoo.Flags = PRINTER_CHANGE_WRITE_JOB;
pnoo.Count = 1;
pnoo.pTypes = pno;
OpenPrinter("Printer Name", &hPrinter, &pd);
SetPrinter(hPrinter, 0, NULL, PRINTER_CONTROL_GET_STATE);
hChange = FindFirstPrinterChangeNotification(hPrinter, PRINTER_CHANGE_WRITE_JOB, 0, &pnoo);
if (hChange == INVALID_HANDLE_VALUE) {
ClosePrinter(hPrinter);
return;
}
while (true) {
WaitForSingleObject(hChange, INFINITE);
if (FindNextPrinterChangeNotification(hChange, NULL, &pnoo, (void**)&pd)) {
ReadPrinter(hPrinter, buffer, sizeof(buffer), &dwRead);
// 处理打印作业数据,如将数据保存到文件或修改数据后重新写入打
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