WLAN_QOS_INFO structure (wlanapi.h)

Article
03/13/2024

Important

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Represents information about the four features outlined in the WFA's Wi-Fi QoS Management Specification, and defined in the 802.11 spec.

Syntax

typedef struct _WLAN_QOS_INFO {
  WLAN_QOS_CAPABILITIES    interfaceCapabilities;
  BOOL                     bConnected;
  WLAN_CONNECTION_QOS_INFO connectionQoSInfo;
} WLAN_QOS_INFO, *PWLAN_QOS_INFO;

Members

interfaceCapabilities

Type: WLAN_QOS_CAPABILITIES

The QoS capabilities of the interface.

bConnected

Type: BOOL

Represents whether or not there's an established connection. If TRUE, then connectionQoSInfo holds QoS information about the current connection. Otherwise, connectionoQoSInfo will be zeroed.

connectionQoSInfo

Type: WLAN_CONNECTION_QOS_INFO

Information about the QoS features (outlined by the WFA Wi-Fi QoS Management Specification) pertaining to the current connection. This structure contains relevant information only if bConnected is TRUE; otherwise it is all zeros, and you should ignore it.

Remarks

Examples

void DisplayQoSInfo(GUID interfaceGuid)
{
    wil::unique_wlan_handle clientHandle;
    const DWORD maxClientVersion = 2;
    DWORD currentClientVersion = 0;
    DWORD status = WlanOpenHandle(maxClientVersion, nullptr, &currentClientVersion, &clientHandle);
    if (status != ERROR_SUCCESS) 
    {
        wprintf(L"WlanOpenHandle failed with error: %u\n", status);
        return;
    }

    wil::unique_wlan_ptr<WLAN_QOS_INFO> qosInfo;
    DWORD dataSize;
    status = WlanQueryInterface(clientHandle.get(), &interfaceGuid, wlan_intf_opcode_qos_info, nullptr, &dataSize, wil::out_param_ptr<void **>(qosInfo), nullptr);
    if (status != ERROR_SUCCESS)
    {
        wprintf(L"WlanQueryInterface failed with error %u\n", status);
        return;
    }

    wprintf(
        L"Interface QoS Capabilities: MSCS Supported = %u, DSCP To UP Mapping Supported = %u, SCS Supported = %u, DSCP Policy Supported = %u\n",
        qosInfo->interfaceCapabilities.bMSCSSupported,
        qosInfo->interfaceCapabilities.bDSCPToUPMappingSupported,
        qosInfo->interfaceCapabilities.bSCSSupported,
        qosInfo->interfaceCapabilities.bDSCPPolicySupported);

    if (!qosInfo->bConnected)
    {
        // Not connected, so the data that follows in connectionQoSInfo is meaningless.
        return;
    }

    const auto& connectionQoSInfo = qosInfo->connectionQoSInfo;
    wprintf(
        L"AP QoS Capabilities: MSCS Supported = %u, DSCP To UP Mapping Supported = %u, SCS Supported = %u, DSCP Policy Supported = %u\n",
        connectionQoSInfo.peerCapabilities.bMSCSSupported,
        connectionQoSInfo.peerCapabilities.bDSCPToUPMappingSupported,
        connectionQoSInfo.peerCapabilities.bSCSSupported,
        connectionQoSInfo.peerCapabilities.bDSCPPolicySupported);

    wprintf(
        L"Connection QoS Info:\n\tMSCS Configured = %u\n\tDSCP To UP Mapping Configured = %u\n\tNumber of SCS Streams = %u\n\tNumber of DSCP Policies = %u\n",
        connectionQoSInfo.bMSCSConfigured,
        connectionQoSInfo.bDSCPToUPMappingConfigured,
        connectionQoSInfo.ulNumConfiguredSCSStreams,
        connectionQoSInfo.ulNumConfiguredDSCPPolicies);
}

Requirements

Requirement	Value
Header	wlanapi.h

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