Re: [問題] C winsock2 server IP

[Powernow (PowerNow!)]

這段code或許可以參考一下，條件是server要先知道自己的hostname

#include <windows.h>
#include <winsock.h>
#include <stdio.h>

#pragma comment(lib, "Ws2_32.lib")

int main(int argc, char *argv[])
{
    WSADATA wsaData;
    DWORD addr;

    struct in_addr addr_i;
    struct hostent *he;

    if (argc < 2) return 0;

    if (WSAStartup(MAKEWORD(1,1), &wsaData)!=0) return -1;
    if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE (wsaData.wVersion) != 1) {
        WSACleanup();
        return -1;
    }

    // Resolve hostname
    if ((addr = inet_addr(argv[1])) == INADDR_NONE) {
        he = gethostbyname(argv[1]);
        if (he == NULL) {
            WSACleanup();
            return 0;
        }
        addr = *(DWORD *)(he->h_addr_list[0]);
        addr_i.s_addr = addr;
    }

    printf("%08X\n", addr);
    printf("%s", inet_ntoa(addr_i));
    WSACleanup();
    return 0;
}

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