Simple C++ class example using serial port, USB, wireless...

This post is part of the Practical C++ programming tutorial for Bioloid

Here you can find a post serie about using serial port communications with C/C++ and C#, for Windows, Linux and microcontrollers.
This code can be used (of course) for serial cable communications, USB2Dynamixel and indeed Zigbee:

Header:

[sourcecode language="cpp"]
class SerialPort {
private:
HANDLE serialPortHandle;

public:
SerialPort();
~SerialPort();

int connect ();
int connect (wchar_t *device);
//int connect (char *deviceName, int baudRate, SerialParity parity);
void disconnect(void);

int sendArray(unsigned char *buffer, int len);
int getArray (unsigned char *buffer, int len);

void clear();
};
[/sourcecode]

Body:

[sourcecode language="cpp"]

SerialPort::SerialPort() {
serialPortHandle = INVALID_HANDLE_VALUE;
}

SerialPort::~SerialPort() {
if (serialPortHandle!=INVALID_HANDLE_VALUE)
CloseHandle(serialPortHandle);

serialPortHandle = INVALID_HANDLE_VALUE;
}

int SerialPort::connect() {
return connect(L"COM1");
}

int SerialPort::connect( wchar_t* device) {
int error=0;
DCB dcb;

memset(&dcb,0,sizeof(dcb));

dcb.DCBlength = sizeof(dcb);

dcb.BaudRate = 57600;
dcb.Parity = NOPARITY;
dcb.fParity = 0;
dcb.StopBits = ONESTOPBIT;
dcb.ByteSize = 8;

serialPortHandle = CreateFile(device, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, NULL, NULL);

if (serialPortHandle != INVALID_HANDLE_VALUE) {
if(!SetCommState(serialPortHandle,&dcb))
error=2;
}
else {
error=1;
}

if (error!=0) {
disconnect();
}
else {
clear();
}

return error;
}

void SerialPort::disconnect(void) {
CloseHandle(serialPortHandle);
serialPortHandle = INVALID_HANDLE_VALUE;

//printf("Port 1 has been CLOSED and %d is the file descriptionn", fileDescriptor);
}

int SerialPort::sendArray(unsigned char *buffer, int len) {
unsigned long result;

if (serialPortHandle!=INVALID_HANDLE_VALUE)
WriteFile(serialPortHandle, buffer, len, &result, NULL);

return result;
}

int SerialPort::getArray (unsigned char *buffer, int len) {
unsigned long read_nbr;

read_nbr = 0;
if (serialPortHandle!=INVALID_HANDLE_VALUE)
{
ReadFile(serialPortHandle, buffer, len, &read_nbr, NULL);
}

return((int) read_nbr);
}

void SerialPort::clear() {
PurgeComm (serialPortHandle, PURGE_RXCLEAR | PURGE_TXCLEAR);
}
[/sourcecode]