Converting a C char array into a Matlab String [Matlab Coder]

Question

My intention is to show for the output of Matlab System a string the type char_T data[ ], that I receive a function in C through coder.ceval

I want to show more specifically the buffer variable, as it would have to declare the buffer variable

matlab
function data = stepImpl(obj)
        buffer = ¿¿ ??;

        if coder.target ('Rtw')
            coder.cinclude('File_Wrapper.h');
            coder.ceval('function',obj.port, coder.wref(buffer)); 
            data = ¿¿¿ string(buffer) ???;
        end
end

this would be the function sent to me by char_T data[ ], I use coder.wref to fill the variable in the following method

void function(uint8_T uartPort, char_T data[])
{
    char buffer[30];
    if (uartPort == 1)
    {
        fgets(buffer, 10, uart1);
    }
    else if (uartPort == 2)
    {
        fgets(buffer, 10, uart2);
    }

    snprintf (data, sizeof(buffer), "%s", buffer);
}

This post dont work for me: Converting a C char array into a Matlab String using Matlab Coder

Nathan Schaaf · Accepted Answer · 2019-04-03 19:36:52Z

1

What exactly is going wrong with the code you have written? Do you see any error messages, or get answers different than you expect?

I think that you might run into problems with your 'buffer' variable in MATLAB not being large enough to store everything that you are printing into it in your C code. I would recommend initializing it with 'buffer = blanks(10)' to make sure it can hold at least 10 characters (which is the number I think you are reading). Another good option might be to just use 'fread' instead of your custom C code (if that is possible), as that function is supported for MATLAB Coder.

answered Apr 3, 2019 at 19:36

Nathan Schaaf

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