Remote control trough COM port.
I'm trying to write a program that listens on the COM port. I have a remote control and an IR that connects to the COM port.
I wonder if it's possible to use CreateFile() and ReadFile() for this.
My current code are below but it does'nt present any information to screen (as it should).
It seems that ReadFile() does'nt get any data. Perhaps it has to be done at a lower level?
Code:
int main(void)
{
HANDLE hcom;
DCB dcb;
LPDWORD nBytesRead = NULL;
OVERLAPPED OverLapped;
//DWORD dwEvtMask=0;
char inBuffer[128] = {0};
const char *pcComPort = "COM4";
// Create a handle to COM port
hcom = CreateFile(pcComPort, // Using pcComPort
GENERIC_READ,
0, // Opened with exclusive access
NULL, // No security options
OPEN_EXISTING, // Must use OPEN_EXISTING with COM ports
FILE_FLAG_OVERLAPPED, // Overlapped I/O
NULL); // Must be NULL with COM ports
if (hcom == INVALID_HANDLE_VALUE) {
GetError();
return 0;
}
// ----------START CONFIGURATION----------
if (!GetCommState(hcom, &dcb)) {
GetError();
return 0;
}
// Fill in DCB structure.
dcb.BaudRate = CBR_9600;
dcb.ByteSize = 8;
dcb.Parity = NOPARITY;
dcb.StopBits = ONESTOPBIT;
// Update configuration.
if (!SetCommState(hcom, &dcb)) {
GetError();
return 0;
}
// ----------END CONFIGURATION----------
while (1) {
/*
SetCommMask(hcom, EV_RXCHAR);
WaitCommEvent(hcom, &dwEvtMask, &OverLapped);
*/
ReadFile(hcom, inBuffer, sizeof(inBuffer), nBytesRead, &OverLapped);
if (nBytesRead)
printf("%d, %s", *nBytesRead, inBuffer);
_sleep(5);
}
CloseHandle(hcom);
return 0;
}
