Copying Array elements to a Structure

As I've no idea what interface your array has and what order the strings come out of the array I'm going to assume that your strings are std::string and your array is std::vector<std::string xmlns:std="#unknown">.

The first thing to do is give your structure a constructor:

playerData::playerData( const std::vector<std::string> &input )
{
}

Once you've done that the problem is to convert a string to an integer. Write a function for that:

int string_to_int( const std::string &str )
{
    int value = 0;
    std::istringstream in_str( str );
    in_str >> value;
    if( !in_str )
    {
        throw std::runtime_error( "Couldn't convert string to integer" );
    }
}

and finally implement your constructor in terms of that function:

playerData::playerData( const std::vector<std::string> &input ) : 
    id( string_to_int( input[ 0 ] ) ),
    matches( string_to_int( input[ 1 ] ) ),
    // etc, one initialisation per member
{
}

Cheers,

Ash

PS: This is particularly braindamaged in some respects. What I'd be tempted to do would be to implement a constructor from a stream and pass the data in like that. It'd be easier to test and you could enter player data from the command line as well.