Windows中获取电脑IP地址的方法

这段代码可以在Windows系统中获取当前电脑的IP地址。利用Windows API函数，通过遍历网络连接，获取所有连接的IP地址。

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

int main() {
    ULONG bufferLength = 0;
    DWORD result = 0;
    PIP_ADAPTER_ADDRESSES pAddresses = NULL;
    PIP_ADAPTER_ADDRESSES pCurrAddresses = NULL;

    // 获取缓存长度
    if (GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_GATEWAYS, NULL, NULL, &bufferLength) == ERROR_BUFFER_OVERFLOW) {
        pAddresses = (IP_ADAPTER_ADDRESSES *)malloc(bufferLength);
        // 获取地址
        result = GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_GATEWAYS, NULL, pAddresses, &bufferLength);
        for (pCurrAddresses = pAddresses; pCurrAddresses != NULL; pCurrAddresses = pCurrAddresses->Next) {
            // 遍历所有地址
            for (IP_ADAPTER_UNICAST_ADDRESS *pUnicast = pCurrAddresses->FirstUnicastAddress; pUnicast != NULL; pUnicast = pUnicast->Next) {
                if (pUnicast->Address.lpSockaddr->sa_family == AF_INET) { // IP地址类型为IPv4
                    char ipAddress[16] = { 0 };
                    // 转换网络字节序为点分十进制IP地址
                    inet_ntop(AF_INET, &(((struct sockaddr_in*)(pUnicast->Address.lpSockaddr))->sin_addr), ipAddress, 16);
                    printf("IPv4地址：%s\n", ipAddress);
                }
            }
        }
        free(pAddresses);
    }
    return 0;
}

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