Arduino talking to C++ application

Projects Interfacing w/ Software on the Computer
1

Hello...I was just trying out a c++ which grabs the Serial data the arduino sends using the library provided here:
http://playground.arduino.cc/Interfacing/CPPWindows

The code involves such a line:
Serial* SP = new Serial("COM3");
where com3 is the port to which arduino is connected. However when i try to replace the line with
Serial* SP = new Serial(smile);
where smile contains a string ( a COM port), it says that the function does not accept string arguments. Is there any workaround so that i can pass a desired string into the function. I am looking to scan and detect automatically the port to which arduino is connected.

2

Please post code that reproduces this problem, don't just describe it. How is smile declared?
http://snippets-r-us.com/

3 
Serial* SP = new Serial(smile);

The constructor is expecting a pointer to a null-terminated string of characters (i.e. a C-string).

You can use the c_str()method on your string to convert to C-string.

http://www.cplusplus.com/reference/string/string/c_str/

4

Here is the code:

#include <stdio.h>
#include <tchar.h>
#include <SerialClass.h> // Library described above
#include
#include <Windows.h>

using namespace std;

// application reads from the specified serial port and reports the collected data
int _tmain(int argc, _TCHAR* argv[])
{
printf("Welcome to the serial test app!\n\n");

//Serial* SP = new Serial("\\.\COM10"); // adjust as needed
Serial* SP = new Serial("COM3"); // adjust as needed

if (SP->IsConnected())
printf("We're connected");

char incomingData[256] = ""; // don't forget to pre-allocate memory
//printf("%s\n",incomingData);
int dataLength = 256;
int readResult = 0;

while (SP->IsConnected())
{
readResult = SP->ReadData(incomingData, dataLength);
printf("Bytes read: (-1 means no data available) %i\n", readResult);

//string test(incomingData);

printf("%s", incomingData);
//test = "";

Sleep(500);
}
return 0;
}

5

Once I added SerialClass, your code compiled for me with no changes using MSVC 2010.

Pete

6

sreedevk:
Here is the code:

Serial* SP = new Serial("COM3"); // adjust as needed

No it isn't. That just has a quoted string. The code you mentioned, is what I want:

Serial* SP = new Serial(smile);

Where we can see the definition of smile.

7

I fixed it. The function accepts a character array and not a string. I worked with the heads up given by Hackscribble...thanks man. I am posting my code here which finds out the port to which the arduino is connected. The arduino constantly sends a partcular string over the serial port.

#include "stdafx.h"
#include <stdio.h>
#include <tchar.h>
#include <SerialClass.h>	// Library described above
#include <string>
#include <Windows.h>
#include <iostream>
#include <cstring>

using namespace std;

// application reads from the specified serial port and reports the collected data
int _tmain(int argc, _TCHAR* argv[])
{
	printf("Welcome to the serial test app!\n\n");

	float number = 0;




	for (; number < 10; number++)
	{
		string xps = "COM";
		xps = xps + char(number + '0');
		const char * q = xps.c_str();
		char p[10];
		strcpy_s(p, 10, q);
		Serial* SP = new Serial(p);    // adjust as needed

		

		char incomingData[256] = "";			// don't forget to pre-allocate memory
		//printf("%s\n",incomingData);
		int dataLength = 256;
		int readResult = 0;

		while (SP->IsConnected())
		{
			Sleep(1000);
		readResult = SP->ReadData(incomingData, dataLength);
		if (readResult != -1)
		{
			//printf("Bytes read: (-1 means no data available) %i\n", readResult);

			string test(incomingData);

			//	printf("%s", incomingData);
			test = "";
			if (strcmp(incomingData, "hello") == 1)
			{
				cout << "Yeah...it's arduino";
			}

			else
			{
				cout << "Nah" << endl;
				cout << incomingData;
			}
			
		}
		else cout << "No data received";
		}
		}
		while (1){}
		return 1;
	}