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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "windows.h"
VOIDDumpCommState( 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;}
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