184 lines
4.8 KiB
C
184 lines
4.8 KiB
C
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include "windows.h"
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void main(int argc,char *argv[]) {
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HANDLE hFile;
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DCB MyDcb;
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DCB GottenDcb;
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char *MyPort = "COM1";
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if (argc > 1) {
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MyPort = argv[1];
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}
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printf("Using port %s\n",MyPort);
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if ((hFile = CreateFile(
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MyPort,
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GENERIC_READ | GENERIC_WRITE,
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0,
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NULL,
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CREATE_ALWAYS,
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FILE_ATTRIBUTE_NORMAL,
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NULL
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)) != ((HANDLE)-1)) {
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printf("We successfully opened the %s port.\n",MyPort);
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//
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// Get the state of the comm port and then
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// adjust the values to our liking.
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//
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if (!GetCommState(
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hFile,
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&MyDcb
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)) {
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printf("Couldn't get comm state: %d\n",GetLastError());
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exit(1);
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} else {
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//
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// We immediately to a setcomm state on what we got
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// back. This will test that GetCommState can *ONLY*
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// return good data.
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//
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printf("Sanity check on GetCommState()\n");
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if (!SetCommState(
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hFile,
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&MyDcb
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)) {
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printf("Bad GetCommState: %d\n",GetLastError());
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exit(1);
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}
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printf("GetCommState is ok\n");
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//
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// We've successfully opened the file. Set the state of
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// the comm device.
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//
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MyDcb.BaudRate = 19200;
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MyDcb.ByteSize = 8;
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MyDcb.Parity = NOPARITY;
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MyDcb.StopBits = ONESTOPBIT;
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MyDcb.XonChar = 20;
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MyDcb.XoffChar = 25;
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MyDcb.ErrorChar = 1;
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MyDcb.EofChar = 2;
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MyDcb.EvtChar = 3;
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if (SetCommState(
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hFile,
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&MyDcb
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)) {
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printf("We successfully set the state of the %s port.\n",MyPort);
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//
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// Now we get the comm state again and make sure
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// the adjusted values are as we like them.
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//
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if (!GetCommState(
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hFile,
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&GottenDcb
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)) {
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printf("Couldn't get the adjusted dcb: %d\n",GetLastError());
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exit(1);
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} else {
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printf("Got the new state - checking\n");
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if (MyDcb.BaudRate != GottenDcb.BaudRate) {
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printf("MyDcb.BaudRate != GottenDcb.BaudRate: %d %d\n",MyDcb.BaudRate,GottenDcb.BaudRate);
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}
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if (MyDcb.ByteSize != GottenDcb.ByteSize) {
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printf("MyDcb.ByteSize != GottenDcb.ByteSize: %d %d\n",MyDcb.ByteSize,GottenDcb.ByteSize);
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}
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if (MyDcb.Parity != GottenDcb.Parity) {
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printf("MyDcb.Parity != GottenDcb.Parity: %d %d\n",MyDcb.Parity,GottenDcb.Parity);
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}
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if (MyDcb.StopBits != GottenDcb.StopBits) {
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printf("MyDcb.StopBits != GottenDcb.StopBits: %d %d\n",MyDcb.StopBits,GottenDcb.StopBits);
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}
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if (MyDcb.XonChar != GottenDcb.XonChar) {
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printf("MyDcb.XonChar != GottenDcb.XonChar: %d %d\n",MyDcb.XonChar,GottenDcb.XonChar);
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}
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if (MyDcb.XoffChar != GottenDcb.XoffChar) {
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printf("MyDcb.XoffChar != GottenDcb.XoffChar: %d %d\n",MyDcb.XoffChar,GottenDcb.XoffChar);
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}
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if (MyDcb.ErrorChar != GottenDcb.ErrorChar) {
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printf("MyDcb.ErrorChar != GottenDcb.ErrorChar: %d %d\n",MyDcb.ErrorChar,GottenDcb.ErrorChar);
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}
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if (MyDcb.EofChar != GottenDcb.EofChar) {
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printf("MyDcb.EofChar != GottenDcb.EofChar: %d %d\n",MyDcb.EofChar,GottenDcb.EofChar);
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}
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if (MyDcb.EvtChar != GottenDcb.EvtChar) {
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printf("MyDcb.EvtChar != GottenDcb.EvtChar: %d %d\n",MyDcb.EvtChar,GottenDcb.EvtChar);
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}
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}
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} else {
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DWORD LastError;
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LastError = GetLastError();
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printf("Couldn't set the %s device.\n",MyPort);
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printf("Status of failed set is: %d\n",LastError);
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}
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}
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} else {
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DWORD LastError;
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LastError = GetLastError();
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printf("Couldn't open the %s device.\n",MyPort);
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printf("Status of failed open is: %d\n",LastError);
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}
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}
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