169 lines
4.3 KiB
C
169 lines
4.3 KiB
C
#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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#define BIGREAD 256000
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unsigned char readbuff[BIGREAD];
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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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char *MyPort = "COM1";
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DWORD NumberToRead = 0;
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DWORD UseBaud = 19200;
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COMMTIMEOUTS To;
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if (argc > 1) {
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sscanf(argv[1],"%d",&NumberToRead);
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if (argc > 2) {
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sscanf(argv[2],"%d",&UseBaud);
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if (argc > 3) {
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MyPort = argv[3];
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}
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}
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}
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printf("Will try to read %d characters.\n",NumberToRead);
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printf("Will try to read a %d baud.\n",UseBaud);
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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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To.ReadIntervalTimeout = 0;
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To.ReadTotalTimeoutMultiplier = ((1000+(((UseBaud+9)/10)-1))/((UseBaud+9)/10));
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if (!To.ReadTotalTimeoutMultiplier) {
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To.ReadTotalTimeoutMultiplier = 1;
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}
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printf("Multiplier is: %d\n",To.ReadTotalTimeoutMultiplier);
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To.ReadTotalTimeoutConstant = 5000;
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To.WriteTotalTimeoutMultiplier = 0;
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To.WriteTotalTimeoutConstant = 5000;
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if (SetCommTimeouts(
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hFile,
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&To
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)) {
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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. First we get the old values and
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// adjust to our own.
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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 the comm state: %d\n",GetLastError());
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exit(1);
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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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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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if (PurgeComm(
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hFile,
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PURGE_TXABORT
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)) {
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printf("We succesfully purged\n");
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} else {
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DWORD LastError;
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LastError = GetLastError();
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printf("Couldn't purge the %s device.\n",MyPort);
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printf("Status of failed purge is: %x\n",LastError);
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}
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if (!PurgeComm(
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hFile,
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0
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)) {
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printf("Purge correctly detects bad parameter: %d\n",GetLastError());
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} else {
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printf("Purge should have rejected!!!!!\n");
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}
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if (FlushFileBuffers(hFile)) {
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printf("We succesfully flushed\n");
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} else {
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DWORD LastError;
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LastError = GetLastError();
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printf("Couldn't flush the %s device.\n",MyPort);
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printf("Status of failed flush is: %x\n",LastError);
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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: %x\n",LastError);
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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 timeouts.\n",MyPort);
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printf("Status of failed timeouts is: %x\n",LastError);
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}
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CloseHandle(hFile);
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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: %x\n",LastError);
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}
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}
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