无法使用 "strtok"拆分 IP 地址和端口，其中输入为 Char *

Question

我正在尝试将 IP 分成两部分，但它不起作用。谁能指出问题

    void encode_ip_with_port(unsigned char *tlvbuf) {
    // 100.100.100.100:65000
    // abcd:abcd:abcd:abcd:abcd:abcd:abcd:abcd:12344
        // Ipv4
        struct in_addr addr;
        // Remove Port
        char *ipv4 = NULL ;
        char *port = NULL;
        printf("Input : %s\n ",tlvbuf);
        char input = ":";
        //char str[]="this, by the way, is a 'sample'";
        ipv4 = strtok(tlvbuf, &input);
        port = strtok(NULL, ":");
        printf("Ipv4 : %s\n",ipv4);
                printf("port : %s\n",port);
        if (!inet_pton(AF_INET,ipv4 , &addr)) {
            fprintf(stderr, "Could not convert address\n");
        }
}

此处 ipv4 正在打印 ipv4 : 100.100.100.100:65000它应该打印 100.100.100.100

Answer 1

strtok 需要一个字符串作为输入。您需要更改以下内容:

添加:

#include <string.h>

改变:

    char *input = ":";  // char --> char*
    ipv4 = strtok(tlvbuf, input);  // removed &

工作示例:

#include<stdio.h>
#include<string.h>
main()
{
    char *ipv4, *port;
    char tlvbuf[80] = "100.100.20.1:65000";
    char* input = ":";
    ipv4 = strtok(tlvbuf, input);
    port = strtok(NULL, ":");
    printf("Ipv4 : %s\n",ipv4);
    printf("port : %s\n",port);
}

输出:

Ipv4 : 100.100.20.1

port : 65000