Serial com for modem / CSerialPort

roidrage666 · #1 12-Jan-2009, 06:46

Hi there. I ve begun to write a small app in MFC so I can send/receive SMS / Calls without using any terminal.

I'm using CSerialPort 1.27
and I just have written down a few lines in this way

CPP / C++ / C Code:

port->Open(1, 9600, CSerialPort::NoParity, 8,CSerialPort::OneStopBit, CSerialPort::NoFlowControl);

	char *sBuf ="AT" + char(13);
 
	port->Write(sBuf, strlen(sBuf)); 

 char *sBuf1 ="ATD <mob. number>" + char(13) ;
 
	port->Write(sBuf1, strlen(sBuf1));

just to test it.

It doesn't work, and given my recent bitter experiance with serial coms in .net, I begin to get paranoid..

Please any help would be very helpful, thanks in advance.

davekw7x · #2 12-Jan-2009, 08:54

Quote:

Originally Posted by roidrage666

CPP / C++ / C Code:

	char *sBuf ="AT" + char(13);

That's invalid code.

To create a string literal, you can use \xcc to embed the hexadecimal value of a char.

For example, the hex value of decimal 13 is 0x0d, so you could have

CPP / C++ / C Code:

    char *sBuf = "AT\x0d";

To embed certain C (and C++) special chars such as \r, you can just use the special char designation inside the quotes

The intent of the following is more clear (to me, at least), and I don't have to depend on future code maintainers having memorized the hexadecimal value for ASCII carriage-return, so I would recommend something like:

CPP / C++ / C Code:

    char *sBuf1 ="ATD <mob. number>\r";

Here's a reference to my second example: Constants

Here's a standard C++ test program (no MFC stuff or any other non-Standard library classes):

CPP / C++ / C Code:

#include <iostream>

using namespace std;

int main()
{
    char *sBuf = "AT\x0d";
    char *sBuf1 ="ATD <mob. number>\r";

    cout << "sBuf: " << endl << " ";
    for (int i = 0; sBuf[i]; i++){ 
        if (isprint(sBuf[i])) {
            cout << "'" << sBuf[i] << "',";
        }
        else  {
            cout << "<" << int(sBuf[i]) << "> ";
        }
    }
    cout << endl << endl;
    cout << "sBuf1:" << endl << " ";
    for (int i = 0; sBuf1[i]; i++){ 
        if (isprint(sBuf1[i])) {
            cout << "'" << sBuf1[i] << "',";
        }
        else  {
            cout << "<" << int(sBuf1[i]) << "> ";
        }
    }
    cout << endl;
    return 0;
}

Printing chars (separated by commas) are shown between single quote marks and decimal values of non-printing chars are shown between angle brackets:

Code:

sBuf: 
 'A','T',<13> 

sBuf1:
 'A','T','D',' ','<','m','o','b','.',' ','n','u','m','b','e','r','>',<13>

Regards,

Dave

roidrage666 · #3 13-Jan-2009, 02:44

really, this couldn't be more helpful, Dave...

Thanks man, all works fine now

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Serial com for modem / CSerialPort

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Re: serial com for modem / CSerialPort