Ya esta solucionado:
infile.open("data.txt"); // create input stream and connect "data" to it
in.open("data.txt");
if(!infile || !in)
{
cerr << "Unable to open file data.txt\n";
sc_stop();
}
else
{
cout << infile.tellg();
cout <<"\n";
// Read first line to know the length
infile.getline(line,N);
a1->columns=strlen(line);
cout << a1->columns;
cout << "\n";
// Count the number of lines
do
{
a1->rows++;
infile.getline(line,N);
}while(infile);
infile.close();
cout << a1->rows;
cout << "\n";
// Create the matrix
a1->constructor();
cout << "EXIT CONSTRUCTOR\n";
while((in)&&(i<a1->rows))
{
// Read next line
in.getline(line,N);
// Copy the read information into an array
a1->array[i]=line;
// Print the read information
cout << a1->array[i] << endl;
// Increase the index
i++;
}
cout << i;
cout << "\n";
in.close();
cout << "File closed\n";
// a1->destructor();
cout << "Memory deleted\n";
matrix_finished.write(1);
data.write(*a1);
}