H
so, jetzt hätte ich mal eine etwas konkretere Frage:
Ich habe das ganze jetzt mal mit CreateFile usw. probiert.
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <commdlg.h>
void main()
{
HANDLE hSerial;
COMMTIMEOUTS timeouts;
COMMCONFIG dcbSerialParams;
char *words, *buffRead, *buffWrite;
DWORD dwBytesWritten, dwBytesRead;
int nread,nwrite;
hSerial = CreateFile("COM6",
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,//FILE_FLAG_OVERLAPPED, // FILE_ATTRIBUTE_NORMAL
NULL);
if ( hSerial == INVALID_HANDLE_VALUE)
{
if (GetLastError() == ERROR_FILE_NOT_FOUND)
{
printf(" serial port does not exist \n");
}
printf(" some other error occured. Inform user.\n");
}
if (!GetCommState(hSerial, &dcbSerialParams.dcb))
{
printf("error getting state \n");
}
dcbSerialParams.dcb.DCBlength = sizeof(dcbSerialParams.dcb);
dcbSerialParams.dcb.BaudRate = CBR_9600;
dcbSerialParams.dcb.ByteSize = 8;
dcbSerialParams.dcb.StopBits = ONESTOPBIT;
dcbSerialParams.dcb.Parity = NOPARITY;
dcbSerialParams.dcb.fBinary = TRUE;
dcbSerialParams.dcb.fDtrControl = DTR_CONTROL_DISABLE;
dcbSerialParams.dcb.fRtsControl = RTS_CONTROL_DISABLE;
dcbSerialParams.dcb.fOutxCtsFlow = FALSE;
dcbSerialParams.dcb.fOutxDsrFlow = FALSE;
dcbSerialParams.dcb.fDsrSensitivity= FALSE;
dcbSerialParams.dcb.fAbortOnError = TRUE;
if (!SetCommState(hSerial, &dcbSerialParams.dcb))
{
printf(" error setting serial port state \n");
}
GetCommTimeouts(hSerial,&timeouts);
timeouts.ReadIntervalTimeout = 200;//50
timeouts.ReadTotalTimeoutConstant = 200;//50
timeouts.ReadTotalTimeoutMultiplier = 100;//10
timeouts.WriteTotalTimeoutConstant = 200;//50
timeouts.WriteTotalTimeoutMultiplier= 100;//10
if(!SetCommTimeouts(hSerial, &timeouts))
{
printf("error setting port state \n");
}
//****************Write Operation*********************
words = "#03";
nwrite = strlen(words);
buffWrite = words;
dwBytesWritten = 0;
if (!WriteFile(hSerial, &buffWrite, nwrite, &dwBytesWritten, NULL))
{
printf("error writing to output buffer \n");
}
printf("Data written to write buffer is \n %s \n", buffWrite);
//***************Read Operation******************//
buffRead = 0;
dwBytesRead = 0;
nread = strlen(words);
if (!ReadFile(hSerial, &buffRead, nread, &dwBytesRead, NULL))
{
printf("error reading from input buffer \n");
}
printf("Data read from read buffer is \n %s \n", buffRead);
CloseHandle(hSerial);
}
Das ganze läuft ohne Fehler durch, allerdings gibt er mir nur (null) aus.
Es sollte (lt. Utility Programm) so funktionieren, dass wenn ich '#03' hinausschreibe, er mir die gemessene Temperatur zurückgibt.
Hoffe, ihr kennt euch aus! Wär über jede Hilfe sehr dankbar!
