I mean for generating a PNG file, not reading one. It's not the best example I'm sure; it's just what popped into my head. If you prefer, it's an Ethernet pack

I mean for generating a PNG file, not reading one. It's not the best example I'm sure; it's just what popped into my head. If you prefer, it's an Ethernet packet, with a CRC16 on the end. It is outbound. The send() and write() functions are happy to accept a void pointer.