wlanapi连接一个已经连接过的wifi

可以使用如下代码连接一个已经连接过的 WiFi 网络：

#include <windows.h>
#include <wlanapi.h>
#include <wtypes.h>
#include <winerror.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#include <string.h>

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

DWORD WlanConnect(LPCWSTR profileName)
{
    HANDLE hClient = NULL;
    DWORD dwMaxClient = 2;
    DWORD dwCurVersion = 0;
    DWORD dwResult = 0;
    DWORD dwRetVal = 0;
    WCHAR GuidString[39] = { 0 };
    DWORD dwReasonCode = 0;

    PWLAN_INTERFACE_INFO_LIST pIfList = NULL;
    PWLAN_INTERFACE_INFO pIfInfo = NULL;
    PWLAN_AVAILABLE_NETWORK_LIST pAvailableNetworkList = NULL;
    PWLAN_AVAILABLE_NETWORK pAvailableNetwork = NULL;

    dwResult = WlanOpenHandle(dwMaxClient, NULL, &dwCurVersion, &hClient);
    if (dwResult != ERROR_SUCCESS) {
        wprintf(L"WlanOpenHandle failed with error: %u\n", dwResult);
        return dwResult;
    }

    dwResult = WlanEnumInterfaces(hClient, NULL, &pIfList);
    if (dwResult != ERROR_SUCCESS) {
        wprintf(L"WlanEnumInterfaces failed with error: %u\n", dwResult);
        return dwResult;
    }

    for (DWORD i = 0; i < pIfList->dwNumberOfItems; i++) {
        pIfInfo = (WLAN_INTERFACE_INFO *)&pIfList->InterfaceInfo[i];

        dwResult = WlanGetAvailableNetworkList(hClient, &pIfInfo->InterfaceGuid, 0, NULL, &pAvailableNetworkList);
        if (dwResult != ERROR_SUCCESS) {
            wprintf(L"WlanGetAvailableNetworkList failed with error: %u\n", dwResult);
            return dwResult;
        }

        for (DWORD j = 0; j < pAvailableNetworkList->dwNumberOfItems; j++) {
            pAvailableNetwork = (WLAN_AVAILABLE_NETWORK *)&pAvailableNetworkList->Network[j];
            if (wcscmp(pAvailableNetwork->strProfileName, profileName) == 0) {
                WLAN_CONNECTION_PARAMETERS connectionParams;
                memset(&connectionParams, 0, sizeof(WLAN_CONNECTION_PARAMETERS));
                connectionParams.wlanConnectionMode = wlan_connection_mode_profile;
                connectionParams.strProfile = pAvailableNetwork->strProfileName;
                connectionParams.pDot11Ssid = NULL;
                connectionParams.pDesiredBssidList = NULL;
                connectionParams.dot11BssType = dot11_BSS_type_infrastructure;
                connectionParams.dwFlags = 0;

                dwResult = WlanConnect(hClient, &pIfInfo->InterfaceGuid, &connectionParams, NULL);
                if (dwResult != ERROR_SUCCESS) {
                    wprintf(L"WlanConnect failed with error: %u\n", dwResult);
                    return dwResult;
                }
                else {
                    wprintf(L"Connected to network: %s\n", pAvailableNetwork->strProfileName);
                    break;
                }
            }
        }

        if (pAvailableNetworkList != NULL) {
            WlanFreeMemory(pAvailableNetworkList);
            pAvailableNetworkList = NULL;
        }
    }

    if (pIfList != NULL) {
        WlanFreeMemory(pIfList);
        pIfList = NULL;
    }

    return ERROR_SUCCESS;
}

int wmain(int argc, WCHAR *argv[])
{
    DWORD dwResult = 0;

    dwResult = WlanConnect(L"Your_WiFi_Profile_Name");
    if (dwResult != ERROR_SUCCESS) {
        wprintf(L"Failed to connect to WiFi network.\n");
    }

    return 0;
}

其中，`profileName` 参数表示需要连接的 WiFi 网络的配置文件名称，需要修改为你自己的 WiFi 网络配置文件名称。