Msys + MinGW 用 WINDOWS API 枚举本机网卡

源代码：get_adpater.c

#include <winsock2.h>
#include <iphlpapi.h>
#include <stdio.h>

int main(int argc, char *argv[])
{

    PIP_ADAPTER_ADDRESSES pAddresses;
    ULONG outBufLen = 0;
    DWORD dwRetVal = 0;

    pAddresses = (IP_ADAPTER_ADDRESSES*) malloc(sizeof(IP_ADAPTER_ADDRESSES));

    // Make an initial call to GetAdaptersAddresses to get the

    // size needed into the outBufLen variable

    if (GetAdaptersAddresses(AF_INET, 0, NULL, pAddresses, &outBufLen)
        == ERROR_BUFFER_OVERFLOW) {
            free(pAddresses);
            pAddresses = (IP_ADAPTER_ADDRESSES*) malloc(outBufLen);
    }

    // Make a second call to GetAdapters Addresses to get the

    // actual data we want

    if ((dwRetVal = GetAdaptersAddresses(AF_INET,
        0,
        NULL,
        pAddresses,
        &outBufLen)) == NO_ERROR) {
            // If successful, output some information from the data we received

            PIP_ADAPTER_ADDRESSES pCurrAddresses = pAddresses;
            while (pCurrAddresses) {
                printf("\tFriendly name: %S\n", pCurrAddresses->FriendlyName);
                printf("\tDescription: %S\n", pCurrAddresses->Description);
                pCurrAddresses = pCurrAddresses->Next;
            }
    }
    else {
        printf("Call to GetAdaptersAddresses failed.\n");
        LPVOID lpMsgBuf;
        if (FormatMessage(
            FORMAT_MESSAGE_ALLOCATE_BUFFER |
            FORMAT_MESSAGE_FROM_SYSTEM |
            FORMAT_MESSAGE_IGNORE_INSERTS,
            NULL,
            dwRetVal,
            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language

            (LPTSTR) &lpMsgBuf,
            0,
            NULL )) {
                printf("\tError: %s", lpMsgBuf);
        }
        LocalFree( lpMsgBuf );
    }
    free(pAddresses);


    return 0;
}


注意事项：

1，修改 C:\MinGW\include\windef.h 中的 #define WINVER 0x0400 为 #define WINVER 0x0501
 
原因：
    因为 0x0400 是 Windows95 0x0501 是 WindowsXP，如果是Windows95的话，是不支持GetAdaptersAddresses 等等函数的，直接报 PIP_ADAPTER_ADDRESSES 未定义的错误，因为 iphlpapi.h 文件中对 PIP_ADAPTER_ADDRESSES 是有条件定义的 即 _WIN32_WINNT >= 0x0501 才行


#if (_WIN32_WINNT >= 0x0501 && defined(_WINSOCK2_H))
ULONG WINAPI GetAdaptersAddresses(ULONG,ULONG,PVOID,PIP_ADAPTER_ADDRESSES,PULONG);
#endif

_WIN32_WINNT 的定义又在哪里呢？
在 windef.h 中，_WIN32_WINNT 定义成了 WINVER


#ifndef _WIN32_WINNT
#define _WIN32_WINNT WINVER

#endif


所以要修改 C:\MinGW\include\windef.h 中的 #define WINVER 0x0400 为 #define WINVER 0x0501  ，前提是你的系统是WindowsXP （可能需要Professional版本，笔者没有深究） 以上的版本


2，编译时使用 -liphlpapi 选项

原因：
    俺也不清楚，原来一直用 -lwsock32 选项来编译WINSOCK程序的，这次怎么都不成功，报错
C:\msys\1.0\home\root>gcc get_adpater.c -o get_adpater -lwsock32
C:\DOCUME~1\root\LOCALS~1\Temp\cc30qUk1.o:get_adpater.c:(.text+0x59): undefined
reference to `GetAdaptersAddresses@20'
C:\DOCUME~1\root\LOCALS~1\Temp\cc30qUk1.o:get_adpater.c:(.text+0xa4): undefined
reference to `GetAdaptersAddresses@20'
collect2: ld returned 1 exit status

用了 -liphlpapi 选项 就成功了
C:\msys\1.0\home\root>gcc get_adpater.c -o get_adpater -liphlpapi

C:\msys\1.0\home\root>get_adpater.exe
        Friendly name: {419F23A4-D89B-476D-8CBA-CDE74DFEE45F}
        Description: Anchorfree HSS Adapter -
        Friendly name:
        Description: Realtek PCIe FE Family Controller -
        Friendly name: VMware Network Adapter VMnet1
        Description: VMware Virtual Ethernet Adapter for VMnet1
        Friendly name: VMware Network Adapter VMnet8
        Description: VMware Virtual Ethernet Adapter for VMnet8
        Friendly name: MS TCP Loopback interface
        Description: MS TCP Loopback interface

C:\msys\1.0\home\root>

在这里找到的


这句话

Re: undefined reference to GetAdaptersInfo@8

Originally Posted by remy06

but I use libiphlpapi.a instead of Iphlpapi.lib

That's why I proposed using "-lIphlpap" since it should work for both cases.

我就尝试了一下 -liphlpapi 选项 ，就成功了。