int64、double字节序转换（大小端）

#include <iostream>#include <WinSock2.h> // 包含windows.h就不要包含这个头文件了#pragma comment(lib, "Ws2_32.lib")struct int64tonet{union{__int64 w_;int r_[2];}w, r;int64tonet(__int64 i){w.w_ = i;r.r_[0] = htonl(w.r_[1]);r.r_[1] = htonl(w.r_[0]);}__int64 operator()(){return r.w_;}};#define INT64_TO_NET(val)((__int64) ( \      (((__int64) (val) &\(__int64) (0x00000000000000ffU)) << 56) |\      (((__int64) (val) &\(__int64) (0x000000000000ff00U)) << 40) |\      (((__int64) (val) &\(__int64) (0x0000000000ff0000U)) << 24) |\      (((__int64) (val) &\(__int64) (0x00000000ff000000U)) <<  8) |\      (((__int64) (val) &\(__int64) (0x000000ff00000000U)) >>  8) |\      (((__int64) (val) &\(__int64) (0x0000ff0000000000U)) >> 24) |\      (((__int64) (val) &\(__int64) (0x00ff000000000000U)) >> 40) |\      (((__int64) (val) &\(__int64) (0xff00000000000000U)) >> 56)))int main(int, char **){__int64 i = 0x1122334455667788;int64tonet j(i);__int64 m = j();__int64 n = INT64_TO_NET(i);std::cout << std::hex << m << std::endl;std::cout << std::hex << n << std::endl;system("pause");}

// int64网络字节序转换为主机字节序inline __int64 ntoh_int64(__int64 val){    __int64 ret = val;#if __BYTE_ORDER == __LITTLE_ENDIAN    ret = (((__int64)ntohl((unsigned long)val)) << 32) | ntohl((unsigned long)(val>>32));#endif    return ret;}// double网络字节序转换为主机字节序inline double ntoh_double(double val){    double ret = val;#if __BYTE_ORDER == __LITTLE_ENDIAN    __int64 tmp = ntoh_int64(*((__int64*)&val));    ret = *((double*)&tmp);#endif    return ret;}