用C获取电脑可用wifi代码

获取电脑可用wifi的代码需要使用操作系统的相关API，因为不同的操作系统实现方式不同，所以以下是Windows和Linux系统下获取可用WiFi的代码示例：

Windows系统：

#include <windows.h>
#include <wlanapi.h>
#include <wtypes.h>
#include <stdio.h>

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

int main(void)
{
    HANDLE hClient;
    DWORD dwMaxClient = 2;  // 可连接的无线网卡数量
    DWORD dwCurVersion = 0;
    DWORD dwResult = 0;
    DWORD i;

    PWLAN_INTERFACE_INFO_LIST pIfList = NULL;
    PWLAN_INTERFACE_INFO pIfInfo = NULL;
    PWLAN_AVAILABLE_NETWORK_LIST pBssList = NULL;

    // 打开WLAN客户端句柄
    dwResult = WlanOpenHandle(dwMaxClient, NULL, &dwCurVersion, &hClient);
    if (dwResult != ERROR_SUCCESS) {
        printf("WlanOpenHandle failed with error: %u\n", dwResult);
        return 1;
    }

    // 枚举WLAN接口信息
    dwResult = WlanEnumInterfaces(hClient, NULL, &pIfList);
    if (dwResult != ERROR_SUCCESS) {
        printf("WlanEnumInterfaces failed with error: %u\n", dwResult);
        WlanCloseHandle(hClient, NULL);
        return 1;
    }

    // 枚举每个接口的可用网络列表
    for (i = 0; i < pIfList->dwNumberOfItems; i++) {
        pIfInfo = &pIfList->InterfaceInfo[i];

        dwResult = WlanGetAvailableNetworkList(hClient, &pIfInfo->InterfaceGuid, 0, NULL, &pBssList);
        if (dwResult != ERROR_SUCCESS) {
            printf("WlanGetAvailableNetworkList failed with error: %u\n", dwResult);
            WlanFreeMemory(pIfList);
            WlanCloseHandle(hClient, NULL);
            return 1;
        }

        // 打印可用网络列表信息
        printf("SSID\t\tSignal Quality\n");
        for (DWORD j = 0; j < pBssList->dwNumberOfItems; j++) {
            WLAN_AVAILABLE_NETWORK network = pBssList->Network[j];
            printf("%-32S\t%d\n", network.dot11Ssid.ucSSID, network.wlanSignalQuality);
        }
        printf("\n");

        WlanFreeMemory(pBssList);
    }

    WlanFreeMemory(pIfList);
    WlanCloseHandle(hClient, NULL);
    return 0;
}

Linux系统：

#include <stdio.h>
#include <stdlib.h>
#include <iwlib.h>

int main(void)
{
    int sockfd;
    struct iwreq req;
    char buffer[32];

    // 打开socket
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        printf("socket error!\n");
        return 1;
    }

    // 获取无线接口名称
    memset(&req, 0, sizeof(req));
    strncpy(req.ifr_name, "wlan0", IFNAMSIZ);
    if (ioctl(sockfd, SIOCGIWNAME, &req) < 0) {
        printf("ioctl error!\n");
        close(sockfd);
        return 1;
    }

    // 获取可用的无线网络