Linux C/C++字节序转换函数

• 一、字节序转换函数
• 二、使用步骤
• 总结

转换端口
uint16_t htons(uint16_t hostshort); //主机字节序->网络字节序
uint16_t ntohs(uint16_t netshort); //网络字节序->主机字节序

转IP
uint32_t htons(uint32_t hostlong);//主机字节序->网络字节序
uint32_t ntohs(uint32_t netlong);//网络字节序->主机字节序

#include
#include

int main()
{
    //htons 转换端口
    unsigned short a=0x0102; 
    printf("%xn",a);
    unsigned short b=htons(a);
    printf("%xn",b);

    printf("--------------------------------n");
    //htonl 转换IP
    char buf[4]={192,168,1,100};
    int num=*(int *)buf;
    int res=htonl(num);
    unsigned char* p=(char*)&res;
    printf("%d %d %d %dn",*p,*(p+1),*(p+2),*(p+3));

    printf("--------------------------------n");
    //ntohs
    unsigned char buf1[4]={1,1,168,192};
    int num1=*(int*)buf1;
    int res1=ntohl(num1);
    unsigned char* p1=(unsigned char*)&res1;
    printf("%d %d %d %dn",*p1,*(p1+1),*(p1+2),*(p1+3));

    printf("--------------------------------n");
    //ntohl
    unsigned int c=0x12345678; 
    printf("%xn",c);
    unsigned int d=htonl(c);
    printf("%xn",d);

    return 0;
}

本节主要介绍了字节序转换函数，以便在实际开发中使用。