wlanapi.h (wlanenumInterfaces 函数)

WlanEnumInterfaces 函数枚举本地计算机上当前启用的所有无线 LAN 接口。

语法

DWORD WlanEnumInterfaces(
  [in]  HANDLE                    hClientHandle,
  [in]  PVOID                     pReserved,
  [out] PWLAN_INTERFACE_INFO_LIST *ppInterfaceList
);

参数

[in] hClientHandle

客户端的会话句柄，由先前对 WlanOpenHandle 函数的调用获取。

[in] pReserved

保留供将来使用。 此参数必须设置为 NULL。

[out] ppInterfaceList

指向存储的指针，用于接收 WLAN_INTERFACE_INFO_LIST 结构中无线 LAN 接口的返回列表。

如果调用成功，则返回 WLAN_INTERFACE_INFO_LIST 的缓冲区由 WlanEnumInterfaces 函数分配。

返回值

如果函数成功，则返回值为 ERROR_SUCCESS。

如果函数失败，则返回值可能是以下返回代码之一。

注解

当函数成功时， WlanEnumInterfaces 函数为返回的接口列表分配内存，这些接口在 ppInterfaceList 参数指向的缓冲区中返回。 不再需要缓冲区后，应通过调用 WlanFreeMemory 函数释放用于 ppInterfaceList 参数指向的缓冲区的内存。

示例

以下示例枚举本地计算机上的无线 LAN 接口，并从检索到 的 WLAN_INTERFACE_INFO_LIST 结构和枚举 的 WLAN_INTERFACE_INFO 结构中 输出值。

#ifndef UNICODE
#define UNICODE
#endif

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

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

// Need to link with Wlanapi.lib and Ole32.lib
#pragma comment(lib, "wlanapi.lib")
#pragma comment(lib, "ole32.lib")

int wmain()
{

    // Declare and initialize variables.

    HANDLE hClient = NULL;
    DWORD dwMaxClient = 2;   //    
    DWORD dwCurVersion = 0;
    DWORD dwResult = 0;
    int iRet = 0;
    
    WCHAR GuidString[40] = {0};
     
    int i;

    /* variables used for WlanEnumInterfaces  */
    
    PWLAN_INTERFACE_INFO_LIST pIfList = NULL;
    PWLAN_INTERFACE_INFO pIfInfo = NULL;

    
    dwResult = WlanOpenHandle(dwMaxClient, NULL, &dwCurVersion, &hClient); 
    if (dwResult != ERROR_SUCCESS)  {
        wprintf(L"WlanOpenHandle failed with error: %u\n", dwResult);
        // FormatMessage can be used to find out why the function failed
        return 1;
    }
    
    dwResult = WlanEnumInterfaces(hClient, NULL, &pIfList); 
    if (dwResult != ERROR_SUCCESS)  {
        wprintf(L"WlanEnumInterfaces failed with error: %u\n", dwResult);
        // FormatMessage can be used to find out why the function failed
        return 1;
    }
    else {
        wprintf(L"Num Entries: %lu\n", pIfList->dwNumberOfItems);
        wprintf(L"Current Index: %lu\n", pIfList->dwIndex);
        for (i = 0; i < (int) pIfList->dwNumberOfItems; i++) {
            pIfInfo = (WLAN_INTERFACE_INFO *) &pIfList->InterfaceInfo[i];
            wprintf(L"  Interface Index[%d]:\t %lu\n", i, i);
            iRet = StringFromGUID2(pIfInfo->InterfaceGuid, (LPOLESTR) &GuidString, 39); 
            // For c rather than C++ source code, the above line needs to be
            // iRet = StringFromGUID2(&pIfInfo->InterfaceGuid, (LPOLESTR) &GuidString, 39); 
            if (iRet == 0)
                wprintf(L"StringFromGUID2 failed\n");
            else {
                wprintf(L"  InterfaceGUID[%d]: %ws\n",i, GuidString);
            }    
            wprintf(L"  Interface Description[%d]: %ws", i, 
                pIfInfo->strInterfaceDescription);
            wprintf(L"\n");
            wprintf(L"  Interface State[%d]:\t ", i);
            switch (pIfInfo->isState) {
            case wlan_interface_state_not_ready:
                wprintf(L"Not ready\n");
                break;
            case wlan_interface_state_connected:
                wprintf(L"Connected\n");
                break;
            case wlan_interface_state_ad_hoc_network_formed:
                wprintf(L"First node in a ad hoc network\n");
                break;
            case wlan_interface_state_disconnecting:
                wprintf(L"Disconnecting\n");
                break;
            case wlan_interface_state_disconnected:
                wprintf(L"Not connected\n");
                break;
            case wlan_interface_state_associating:
                wprintf(L"Attempting to associate with a network\n");
                break;
            case wlan_interface_state_discovering:
                wprintf(L"Auto configuration is discovering settings for the network\n");
                break;
            case wlan_interface_state_authenticating:
                wprintf(L"In process of authenticating\n");
                break;
            default:
                wprintf(L"Unknown state %ld\n", pIfInfo->isState);
                break;
            }
            wprintf(L"\n");
        }
    }

    if (pIfList != NULL) {
        WlanFreeMemory(pIfList);
        pIfList = NULL;
    }
    return 0;
}

要求

另请参阅

WLAN_INTERFACE_INFO

WLAN_INTERFACE_INFO_LIST

WlanFreeMemory