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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "windows.h"
void main(int argc,char *argv[]) {
HANDLE hFile; DCB MyDcb; DCB GottenDcb; char *MyPort = "COM1";
if (argc > 1) {
MyPort = argv[1];
}
printf("Using port %s\n",MyPort);
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);
//
// Get the state of the comm port and then
// adjust the values to our liking.
//
if (!GetCommState( hFile, &MyDcb )) {
printf("Couldn't get comm state: %d\n",GetLastError()); exit(1);
} else {
//
// We immediately to a setcomm state on what we got
// back. This will test that GetCommState can *ONLY*
// return good data.
//
printf("Sanity check on GetCommState()\n"); if (!SetCommState( hFile, &MyDcb )) {
printf("Bad GetCommState: %d\n",GetLastError()); exit(1);
} printf("GetCommState is ok\n");
//
// We've successfully opened the file. Set the state of
// the comm device.
//
MyDcb.BaudRate = 19200; MyDcb.ByteSize = 8; MyDcb.Parity = NOPARITY; MyDcb.StopBits = ONESTOPBIT; MyDcb.XonChar = 20; MyDcb.XoffChar = 25; MyDcb.ErrorChar = 1; MyDcb.EofChar = 2; MyDcb.EvtChar = 3;
if (SetCommState( hFile, &MyDcb )) {
printf("We successfully set the state of the %s port.\n",MyPort);
//
// Now we get the comm state again and make sure
// the adjusted values are as we like them.
//
if (!GetCommState( hFile, &GottenDcb )) {
printf("Couldn't get the adjusted dcb: %d\n",GetLastError()); exit(1);
} else {
printf("Got the new state - checking\n");
if (MyDcb.BaudRate != GottenDcb.BaudRate) {
printf("MyDcb.BaudRate != GottenDcb.BaudRate: %d %d\n",MyDcb.BaudRate,GottenDcb.BaudRate);
}
if (MyDcb.ByteSize != GottenDcb.ByteSize) {
printf("MyDcb.ByteSize != GottenDcb.ByteSize: %d %d\n",MyDcb.ByteSize,GottenDcb.ByteSize);
}
if (MyDcb.Parity != GottenDcb.Parity) {
printf("MyDcb.Parity != GottenDcb.Parity: %d %d\n",MyDcb.Parity,GottenDcb.Parity);
}
if (MyDcb.StopBits != GottenDcb.StopBits) {
printf("MyDcb.StopBits != GottenDcb.StopBits: %d %d\n",MyDcb.StopBits,GottenDcb.StopBits);
}
if (MyDcb.XonChar != GottenDcb.XonChar) {
printf("MyDcb.XonChar != GottenDcb.XonChar: %d %d\n",MyDcb.XonChar,GottenDcb.XonChar);
}
if (MyDcb.XoffChar != GottenDcb.XoffChar) {
printf("MyDcb.XoffChar != GottenDcb.XoffChar: %d %d\n",MyDcb.XoffChar,GottenDcb.XoffChar);
}
if (MyDcb.ErrorChar != GottenDcb.ErrorChar) {
printf("MyDcb.ErrorChar != GottenDcb.ErrorChar: %d %d\n",MyDcb.ErrorChar,GottenDcb.ErrorChar);
}
if (MyDcb.EofChar != GottenDcb.EofChar) {
printf("MyDcb.EofChar != GottenDcb.EofChar: %d %d\n",MyDcb.EofChar,GottenDcb.EofChar);
}
if (MyDcb.EvtChar != GottenDcb.EvtChar) {
printf("MyDcb.EvtChar != GottenDcb.EvtChar: %d %d\n",MyDcb.EvtChar,GottenDcb.EvtChar);
}
}
} else {
DWORD LastError; LastError = GetLastError(); printf("Couldn't set the %s device.\n",MyPort); printf("Status of failed set is: %d\n",LastError);
}
}
} else {
DWORD LastError; LastError = GetLastError(); printf("Couldn't open the %s device.\n",MyPort); printf("Status of failed open is: %d\n",LastError);
}
}
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