如何检测打印机是否联机

如何检测打印机是否联机 ÈçºÎ?ì?â?òÓ??úÊÇ?ñÁª?ú Ê?ÓÃ×?ÓÃ?òÓ??ú ??Ã?ÓÐÇý???ÌÐò??ÎÒÓÃÖ??ÓÍùlpt1Ð?µÄ?????òÓ???Èç?û?òÓ??úÁª?ÓÕý???? ?òÓ?µÄÊý?Ý?áÕý??Êä?ö??µ?Êǵ??òÓ??úÎ?Áª?ú?ò?òÓ??úÃ??ª???ÌÐò?òÓ?Ê??Í?áËÀ?ú??Ö?ÄÜ?? Ctrl+Alt+DelÇ?ÐÐÖÕÖ? ??ÓÐÊ?Ã??ì???ÉÒÔÅÐ?Ï?òÓ??ú×?Ì????òÊÇÈçºÎÉèÖÃÒ??ötimeoutÊ??äÀ?ÖÕÖ? ?òÓ? ? ????ÈçÏÂ: bool LptPrint(char prtdata[],int prtlen,int timeout) { HANDLE h; DWORD n; COMMTIMEOUTS t; bool result; h = CreateFile("lpt1", GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0); if (h == INVALID_HANDLE_VALUE){ AfxMessageBox("Can not open lpt1"); return false; } t.ReadIntervalTimeout = 0; t.ReadTotalTimeoutMultiplier = 0; t.ReadTotalTimeoutConstant = 0; t.WriteTotalTimeoutMultiplier = timeout * 1000 / prtlen; t.WriteTotalTimeoutConstant = 0; if (!SetCommTimeouts(h,&t)){ AfxMessageBox("SetCommTimeout error"); return false; } result = true; if (!WriteFile(h,prtdata,prtlen,&n,NULL)){ AfxMessageBox("Print error"); result = false; } CloseHandle(h); return result; } [À?Ô?:programfan.com(?à?Ì??ºÃÕß)][Ñ?È?:kjkimberly]