memcpy; reinterpret_cast byteArray to long int

Casting a byte array (i.e. unsigned char array) into a single long integer.

You have to cast from pointer to pointer!

// buf is an input declared as char * . Should be unsigned char *
char tmp[8]; 
memcpy(&tmp, buf,8);
long long unsigned tcpFileHeader8byte = *reinterpret_cast<long long unsigned*>(tmp);
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