int整数转16进制

int i = 1234;Byte b1=i & 0xff;Byte b2=(i>>8) & 0xff;Byte b3=(i>>16) & 0xff;Byte b4=(i>>24) & 0xff;Byte byte[] = {b4,b3,b2,b1};NSData *adddata = [NSData dataWithBytes:byte length:sizeof(byte)];