Hello,
This is a sample code to communicate with 2 pcs thro the parallel(LPT1) port. We were successful in creating a Handle and also set a timeout value for the port. But when i try writing to the parallel port write is unsuccessful and the error value is
1167(ERROR_DEVICE_NOT_CONNECTED - The device is not connected. ). Can someone explain what this error means and what could be done to resolve this. I am using VC++ 6.0 on a win2k pc with 64mb of ram. The dest Pc is running on Win98. On this PC, CreateFile fails with an error code of 2250(ERROR_NOT_CONNECTED - This network connection does not exist. ). Please elaborate in case any details are available./**************************************/ HANDLE parallel1 ; DCB DCBStruct; memset(&DCBStruct,0,sizeof(DCB)); char buffer1[65536],buffer2[65536] ; memset(buffer1,0xAA,65536); memset(buffer2,0x66,65536); unsigned long out; char sztemp[50]; COMMTIMEOUTS timeout; /******************************************/ DCBStruct.DCBlength = 28 ; DCBStruct.BaudRate = CBR_256000; DCBStruct.fBinary = 1 ; DCBStruct.fParity = 1 ; DCBStruct.ByteSize = 8; DCBStruct.StopBits = ONESTOPBIT ; /******************************************/ parallel1 = CreateFile("LPT1", GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_ALWAYS,0,NULL); int i = GetLastError(); i = (int )INVALID_HANDLE_VALUE ; if(i != 0 ) { sprintf(sztemp,"Creating Error:%d",i); AfxMessageBox(sztemp); } else { // SetCommState(parallel1,&DCBStruct); // GetCommTimeouts(parallel1,&timeout); timeout.ReadIntervalTimeout = 1 ; timeout.ReadTotalTimeoutConstant = 1 ; timeout.ReadTotalTimeoutMultiplier = 1 ; timeout.WriteTotalTimeoutMultiplier = 1; timeout.WriteTotalTimeoutConstant = 3000 ;////////culprit SetCommTimeouts(parallel1,&timeout); i = GetLastError(); if(i != 0) { sprintf(sztemp,"Set Timeout Err:%d",i); AfxMessageBox(sztemp); } // for(int i = 0 ; i < 3 ; i++) { // WriteFile(parallel1,buffer1,65536,&out,NULL); WriteFile(parallel1,buffer1,10,&out,NULL); i = GetLastError(); sprintf(sztemp,"out : %d, err is %d",out,i); AfxMessageBox(sztemp); WriteFile(parallel1,buffer2,10,&out,NULL); sprintf(sztemp,"out : %d, err is %d",out,i); AfxMessageBox(sztemp); } CloseHandle(parallel1); } /*************************************/ waiting for reply praveen