从类型'int'分配类型'struct in_addr'时不兼容的类型

时间:2015-01-04 04:46:25

标签: android c linux networking android-ndk

我在linux中编写了以下代码(ubuntu 12.04 linux kernel 3.12.17),并且它比较成功,但是当我用eclipse移动android中的代码,并与ndk进行比较时,它显示错误:分配时不兼容的类型输入' struct in_addr'来自类型' int'。

addrs = inet_makeaddr(inet_netof(sin->sin_addr), INADDR_ANY);

整个代码是:

#include <jni.h>
#include <linux/if.h>
#include <linux/in.h>
#include <linux/sockios.h>
#include <stdint.h>
#include <sys/endian.h>
static struct in_addr *getbroadcastaddr(char *inter, int sock, char *buf){
    struct ifconf ifc;
    struct ifreq ifreq,*ifr;
    static struct in_addr addrs;
    struct sockaddr_in *sin;
    bzero(&addrs,sizeof(addrs));
    ifc.ifc_len = UDPMSGSIZE;
    ifc.ifc_buf = buf;
    if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
        perror("broadcast: ioctl (get interface configuration)");
        return(&addrs);
    }
    ifr = ifc.ifc_req;
    for (ifr=ifc.ifc_req;ifr->ifr_name[0];ifr++) {
        if (strcmp(ifr->ifr_name,inter)) continue;
        ifreq = *ifr;
        if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
            perror("broadcast: ioctl (get interface flags)");
            continue;
        }
        if ((ifreq.ifr_flags & IFF_BROADCAST) &&
               (ifreq.ifr_flags & IFF_UP) &&
               (ifr->ifr_addr.sa_family == AF_INET)) {
            sin = (struct sockaddr_in *)&ifr->ifr_addr;
            if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
                addrs = inet_makeaddr(inet_netof(sin->sin_addr), INADDR_ANY);
            } else {
                addrs = ((struct sockaddr_in *)
                        (&ifreq.ifr_broadaddr))->sin_addr;
            }
            printf("Interface : %s\n",ifr->ifr_name);
            return(&addrs);
        }
    }
    return(NULL);
}

为什么呢?做了功能&#39; inet_makeaddr&#39;在android-ndk中是不同的枪?

1 个答案:

答案 0 :(得分:1)

错误消息具有误导性,早期版本的NDK中缺少该功能。编译器产生不兼容的类型错误,因为当函数未定义时,它假定返回类型为int

相关文件是(NDK文件夹)/platforms/android-xx/arch-yyy/usr/include/arpa/inet.h

您可以通过更新为the latest version of the NDK来解决您的问题。自inet_makeaddr

以来inet.h定义了android-21

如果之后仍然出现编译错误,请尝试

#include <arpa/inet.h>