C++ fwrite() in hex

Question

Writing code with Winsock.
I currently have this:

fwrite(buff, 1, len, stdout);

How to do it like:

for ( int i = 0; i < len; i++ ) {
printf( "%02x ", unsigned char (buff[i]) );
}
printf( "\n" );

Or should I just remove the fwrite and use the print instead?
I wanted to write it to stdout, cuz I have my option to either write to stdout of write to file.

Answer 1

fprintf （参见文档 ）就像printf但是对于任意文件：

fprintf(stdout, "%02x ", unsigned char (buff[i]));