#include #include #include #include "windows.h" VOID DumpCommState( IN DCB MyDcb ) { printf("Current comm state: \n"); printf("Size of DCB: %d\n",MyDcb.DCBlength); printf("Baud rate: %d\n",MyDcb.BaudRate); printf("Binary mode: %s\n",MyDcb.fBinary?"TRUE":"FALSE"); printf("Parity checking: %s\n",MyDcb.fParity?"TRUE":"FALSE"); printf("Out CTS Flow: %s\n",MyDcb.fOutxCtsFlow?"TRUE":"FALSE"); printf("Out DSR Flow: %s\n",MyDcb.fOutxDsrFlow?"TRUE":"FALSE"); printf("DTR control: %s\n",MyDcb.fDtrControl==DTR_CONTROL_DISABLE?"DISABLE": MyDcb.fDtrControl==DTR_CONTROL_ENABLE?"ENABLE": MyDcb.fDtrControl==DTR_CONTROL_HANDSHAKE?"HANDSHAKE":"INVALID!"); printf("Dsr sensitive: %s\n",MyDcb.fDsrSensitivity?"TRUE":"FALSE"); printf("Tx Contin xoff: %s\n",MyDcb.fTXContinueOnXoff?"TRUE":"FALSE"); printf("Output X on/off: %s\n",MyDcb.fOutX?"ON":"OFF"); printf("Input X on/off: %s\n",MyDcb.fInX?"ON":"OFF"); printf("Error replace: %s\n",MyDcb.fErrorChar?"ON":"OFF"); printf("Null stripping: %s\n",MyDcb.fNull?"ON":"OFF"); printf("RTS control: %s\n",MyDcb.fRtsControl==RTS_CONTROL_DISABLE?"DISABLE": MyDcb.fRtsControl==RTS_CONTROL_ENABLE?"ENABLE": MyDcb.fRtsControl==RTS_CONTROL_HANDSHAKE?"HANDSHAKE":"TOGGLE"); printf("Abort on error: %s\n",MyDcb.fAbortOnError?"ON":"OFF"); printf("Xon Limit: %d\n",MyDcb.XonLim); printf("Xoff Limit: %d\n",MyDcb.XoffLim); printf("Valid bits/byte: %d\n",MyDcb.ByteSize); printf("Parity: %s\n",MyDcb.Parity==EVENPARITY?"EVEN": MyDcb.Parity==ODDPARITY?"ODD": MyDcb.Parity==MARKPARITY?"MARK": MyDcb.Parity==NOPARITY?"NO":"INVALID"); printf("Stop bits: %s\n",MyDcb.StopBits==ONESTOPBIT?"1": MyDcb.StopBits==TWOSTOPBITS?"2": MyDcb.StopBits==ONE5STOPBITS?"1.5":"INVALID"); printf("Xoff char: %x\n",MyDcb.XoffChar); printf("Xon char: %x\n",MyDcb.XonChar); printf("Error char: %x\n",MyDcb.ErrorChar); printf("EOF char: %x\n",MyDcb.EofChar); printf("Evt char: %x\n",MyDcb.EvtChar); } int __cdecl main(int argc,char *argv[]) { HANDLE hFile; char *MyPort = "COM1"; DWORD ValueFromEscape = 0; DWORD Func; DCB MyDcb; COMMPROP MyCommProp; DWORD NewXon; DWORD NewXoff; int scanfval; if (argc > 1) { MyPort = argv[1]; } if ((hFile = CreateFile( MyPort, GENERIC_READ | GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL )) != ((HANDLE)-1)) { printf("We successfully opened the %s port.\n",MyPort); do { printf("^z=END 1=SETXOFF 2=SETXON 3=SETRTS\n" " 4=CLRRTS 5=SETDTR 6=CLRDTR\n" " 7=RESETDEV 8=SETBREAK 9=CLRBREAK\n" " SET 10=DSR HAND 11=CTS HAND 12=DCD HAND\n" " CLEAR 13=DSR HAND 14=CTS HAND 15=DCD HAND\n" " 16=DTR CONTROL ENABLE\n" " 17=DTR CONTROL DISABLE\n" " 18=DTR INPUT HANDSHAKE ENABLE\n" " 19=DTR INPUT HANDSHARE DISABLE (implies 17)\n" " 20=RTS CONTROL ENABLE\n" " 21=RTS CONTROL DISABLE\n" " 22=RTS INPUT HANDSHAKE ENABLE\n" " 23=RTS INPUT HANDSHAKE DISABLE (implies 21)\n" " 24=ClearCommError 25=GetCommModemStatus\n" " SET 26=AUTO RECEIVE Xxxx 27=AUTO TRANSMIT Xxxx\n" " CLEAR 28=AUTO RECEIVE Xxxx 29=AUTO TRANSMIT Xxxx: \n" " 30=Get Queue Sizes\n" " 31=Get XonLimit 32=Get XoffLimit\n" " 33=Set XonLimit 34=Set XoffLimit\n" " 35=Dump Comm State: "); if ((scanfval = scanf("%d",&Func)) == EOF) { printf("All done\n"); break; } else if (scanfval != 1) { printf("Invalid input\n"); } else { if ((Func >= 1) && (Func <= 35)) { switch (Func) { case 1: if (!EscapeCommFunction( hFile, SETXON )) { printf("Bad status from escape: %d\n",GetLastError()); } break; case 2: if (!EscapeCommFunction( hFile, SETXOFF )) { printf("Bad status from escape: %d\n",GetLastError()); } break; case 3: if (!EscapeCommFunction( hFile, SETRTS )) { printf("Bad status from escape: %d\n",GetLastError()); } break; case 4: if (!EscapeCommFunction( hFile, CLRRTS )) { printf("Bad status from escape: %d\n",GetLastError()); } break; case 5: if (!EscapeCommFunction( hFile, SETDTR )) { printf("Bad status from escape: %d\n",GetLastError()); } break; case 6: if (!EscapeCommFunction( hFile, CLRDTR )) { printf("Bad status from escape: %d\n",GetLastError()); } break; case 7: if (!EscapeCommFunction( hFile, RESETDEV )) { printf("Bad status from escape: %d\n",GetLastError()); } break; case 8: if (!EscapeCommFunction( hFile, SETBREAK )) { printf("Bad status from escape: %d\n",GetLastError()); } break; case 9: if (!EscapeCommFunction( hFile, CLRBREAK )) { printf("Bad status from escape: %d\n",GetLastError()); } break; case 10: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fOutxDsrFlow = TRUE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 11: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fOutxCtsFlow = TRUE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 12: printf("Setting DCD HandShaking not implemented\n"); break; case 13: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fOutxDsrFlow = FALSE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 14: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fOutxCtsFlow = FALSE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 15: printf("Clearing DCD HandShaking is not implemented.\n"); break; case 16: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fDtrControl = DTR_CONTROL_ENABLE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 17: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fDtrControl = DTR_CONTROL_DISABLE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 18: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fDtrControl = DTR_CONTROL_HANDSHAKE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 19: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fDtrControl = DTR_CONTROL_DISABLE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 20: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fRtsControl = RTS_CONTROL_ENABLE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 21: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fRtsControl = RTS_CONTROL_DISABLE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 22: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fRtsControl = DTR_CONTROL_HANDSHAKE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 23: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fRtsControl = DTR_CONTROL_DISABLE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 24: { DWORD Errors; COMSTAT LocalComStat = {0}; if (!ClearCommError( hFile, &Errors, &LocalComStat )) { printf("Couldn't clear errors: %d\n",GetLastError()); } else { if (!Errors) { printf("No errors\n"); } else { if (Errors & CE_RXOVER) { printf("Error: CE_RXOVER\n"); } if (Errors & CE_OVERRUN) { printf("Error: CE_OVERRUN\n"); } if (Errors & CE_RXPARITY) { printf("Error: CE_RXPARITY\n"); } if (Errors & CE_FRAME) { printf("Error: CE_FRAME\n"); } if (Errors & CE_BREAK) { printf("Error: CE_BREAK\n"); } if (Errors & ~(CE_RXOVER | CE_OVERRUN | CE_RXPARITY | CE_FRAME | CE_BREAK)) { printf("Unknown errors: %x\n",Errors); } } printf("Comstat values------------\n"); if (LocalComStat.fCtsHold) { printf("Holding due to Cts\n"); } if (LocalComStat.fDsrHold) { printf("Holding due to Dsr\n"); } if (LocalComStat.fRlsdHold) { printf("Holding due to Xoff received\n"); } if (LocalComStat.fXoffSent) { printf("Holding due to Xoff sent\n"); } if (LocalComStat.fEof) { printf("Eof Seen\n"); } if (LocalComStat.fTxim) { printf("Immediate character being sent\n"); } printf("Chars in typeahead: %d\n",LocalComStat.cbInQue); printf("Chars to be sent: %d\n",LocalComStat.cbOutQue); } break; } case 25: { DWORD ModemStat; if (!GetCommModemStatus( hFile, &ModemStat )) { printf("Couldn't get the modem stat: %d\n",GetLastError()); } else { printf("Modem bits set---------\n"); if (ModemStat & MS_CTS_ON) { printf("CTS is ON\n"); } if (ModemStat & MS_DSR_ON) { printf("DSR is ON\n"); } if (ModemStat & MS_RING_ON) { printf("RING is ON\n"); } if (ModemStat & MS_RLSD_ON) { printf("RLSD is ON\n"); } if (ModemStat & ~(MS_CTS_ON | MS_DSR_ON | MS_RING_ON | MS_RLSD_ON)) { printf("Unknown Modem Stat: %x\n",ModemStat); } } break; } case 26: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fInX = TRUE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 27: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fOutX = TRUE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 28: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fInX = FALSE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 29: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.fOutX = FALSE; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 30: if (!GetCommProperties( hFile, &MyCommProp )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { printf("Rx Queue Size: %d Tx Queue Size: %d\n", MyCommProp.dwCurrentRxQueue, MyCommProp.dwCurrentTxQueue ); } break; case 31: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { printf("XonLimit is %d\n",MyDcb.XonLim); } break; case 32: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { printf("XoffLimit is %d\n",MyDcb.XoffLim); } break; case 33: printf("The New Xon limit Value: "); scanf("%d",&NewXon); printf("Setting Xon limit to %d\n",NewXon); if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.XonLim = (WORD)NewXon; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 34: printf("The New Xoff limit Value: "); scanf("%d",&NewXoff); printf("Setting Xoff limit to %d\n",NewXoff); if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { MyDcb.XoffLim = (WORD)NewXoff; if (!SetCommState( hFile, &MyDcb )) { printf("Couldn't set comm state: %d\n",GetLastError()); } } break; case 35: if (!GetCommState( hFile, &MyDcb )) { printf("Couldn't get comm state: %d\n",GetLastError()); } else { DumpCommState(MyDcb); } break; } } else { printf("Invalid Input\n"); } } } while (TRUE); CloseHandle(hFile); } else { DWORD LastError; LastError = GetLastError(); printf("Couldn't open the %s device.\n",MyPort); printf("Status of failed open is: %x\n",LastError); } return 1; }