Question

I’m a beginning user in C++ and I want to know how to do this:
How can I ‘create’ a byte from a string/int. So for example I’ve:

string some_byte = "202";

When I would save that byte to a file, I want that the file is 1 byte instead of 3 bytes.
How is that possible?
Thanks in advance,
Tim

Answer 1

I would use C++’s String Stream class <sstream> to convert the string to an unsigned char.

And write the unsigned char to a binary file.

so something like [not real code]

std::string some_byte = "202";
std::istringstream str(some_byte);
int val;
if( !(str >> val))
{
  // bad conversion
}

if(val > 255)
{
  // too big
}

unsigned char ch = static_cast<unsigned char>(val);

printByteToFile(ch); //print the byte to file.