IP地址转换函数--inet_addr和inet_ntoa使用笔记

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【inet_addr.c测试代码】

#include <stdio.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string.h>int main(int aargc, char* argv[]){         struct in_addr addr1,addr2;         ulong   l1,l2;         l1= inet_addr("192.168.0.74");         l2 = inet_addr("211.100.21.179");         memcpy(&addr1, &l1, 4);         memcpy(&addr2, &l2, 4);         printf("%s : %s\n", inet_ntoa(addr1), inet_ntoa(addr2)); //注意这一句的运行结果         printf("\"%s\" = inet_ntoa(0x%08x);\n", inet_ntoa(addr1),addr1);         printf("\"%s\" = inet_ntoa(0x%08x);\n", inet_ntoa(addr2),addr2);                  printf("0x%08x == ntohl(0x%08x)\n",ntohl(l1),l1);          printf("0x%08x == ntohl(0x%08x)\n",ntohl(addr1.s_addr),l1);          printf("0x%08x == htonl(0x%08x)\n\n",htonl(addr2.s_addr),addr2.s_addr);                   sockaddr_in socketaddr;         memset(&socketaddr, 0, sizeof(sockaddr_in));         socketaddr.sin_addr.s_addr = addr2.s_addr;         socketaddr.sin_port = htons(12233);//端口         printf("addr2 [ip: port] == [%s:%d]\n", inet_ntoa(socketaddr.sin_addr),ntohs(socketaddr.sin_port));         return 0;}

【Linux系统，CenOS6.4上，make编译，GCC4.8.2 运行结果】

[root@localhost ~]# cp inet_addr.c test.c -acp: overwrite `test.c'? y[root@localhost ~]# makeg++ -c test.cg++ -o test test.o[root@localhost ~]# ./test

192.168.0.74 : 192.168.0.74
"192.168.0.74" = inet_ntoa(0x4a00a8c0);
"211.100.21.179" = inet_ntoa(0xb31564d3);
0xc0a8004a == ntohl(0x4a00a8c0)
0xc0a8004a == ntohl(0x4a00a8c0)
0xd36415b3 == htonl(0xb31564d3)

addr2 [ip: port] == [211.100.21.179:51503]
[root@localhost ~]#

[root@localhost ~]#

【makefile 文件】

test:test.og++ -o test test.otest.o:test.cg++ -c test.c          clean:rm -f *.o test

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