C#wlanapi.dllは、信号強度を受信して発行します
質問
現在、wlanapi.dll wlanqueryinterfaceコールを使用して、ワイヤレスアクセスポイントから信号強度を取得しようとしています。
これが私のAPI宣言です
[DllImport("wlanapi.dll", SetLastError = true)]
private static extern UInt32 WlanQueryInterface(IntPtr hClientHandle, ref Guid pInterfaceGuid, WLAN_INTF_OPCODE OpCode, IntPtr pReserved, out Int32 pdwDataSize, ref IntPtr ppData, IntPtr pWlanOpCodeValueType);
問題は、5400に設定されているwlan_association_attributes構造のwlansignalStrengthエントリを見るときです。MicrosoftAPIドキュメントは、0〜100の間の値であるべきであると述べています。
これが私の構造宣言です:
/// <summary>
/// Structure contains association attributes for a connection.
/// </summary>
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
private struct WLAN_ASSOCIATION_ATTRIBUTES
{
/// <summary>
/// A DOT11_SSID structure that contains the SSID of the association.
/// </summary>
public DOT11_SSID dot11Ssid;
/// <summary>
/// A DOT11_BSS_TYPE value that specifies whether the network is infrastructure or ad hoc.
/// </summary>
public DOT11_BSS_TYPE dot11BssType;
/// <summary>
/// A DOT11_MAC_ADDRESS that contains the BSSID of the association.
/// </summary>
public DOT11_MAC_ADDRESS dot11Bssid;
/// <summary>
/// A DOT11_PHY_TYPE value that indicates the physical type of the association
/// </summary>
public DOT11_PHY_TYPE dot11PhyType;
/// <summary>
/// The position of the DOT11_PHY_TYPE value in the structure containing the list of PHY types.
/// </summary>
public ulong uDot11PhyIndex;
/// <summary>
/// A percentage value that represents the signal quality of the network.
/// </summary>
public Int32 wlanSignalQuality;
/// <summary>
/// Contains the receiving rate of the association.
/// </summary>
public ulong ulRxRate;
/// <summary>
/// Contains the transmission rate of the association.
/// </summary>
public ulong ulTxRate;
}
これが私のwlanqueryinterfaceへの電話です:
Int32 iDataSize;
IntPtr ppData = IntPtr.Zero;
WLAN_CONNECTION_ATTRIBUTES wcaAttributes = new WLAN_CONNECTION_ATTRIBUTES();
String[] sReturn = new String[4];
if (WlanQueryInterface(pClientHandle, ref gInterfaceGUID, WLAN_INTF_OPCODE.wlan_intf_opcode_current_connection, IntPtr.Zero, out iDataSize, ref ppData, IntPtr.Zero) == ERROR_SUCCESS)
{
wcaAttributes = (WLAN_CONNECTION_ATTRIBUTES)Marshal.PtrToStructure(ppData, typeof(WLAN_CONNECTION_ATTRIBUTES));
sReturn[0] = wcaAttributes.wlanAssociationAttributes.dot11Ssid.ucSSID;
sReturn[1] = wcaAttributes.strProfileName;
sReturn[2] = String.Format("{0:X2}-{1:X2}-{2:X2}-{3:X2}-{4:X2}-{5:X2}", wcaAttributes.wlanAssociationAttributes.dot11Bssid.bOne, wcaAttributes.wlanAssociationAttributes.dot11Bssid.bTwo, wcaAttributes.wlanAssociationAttributes.dot11Bssid.bThree, wcaAttributes.wlanAssociationAttributes.dot11Bssid.bFour, wcaAttributes.wlanAssociationAttributes.dot11Bssid.bFive, wcaAttributes.wlanAssociationAttributes.dot11Bssid.bSix);
sReturn[3] = wcaAttributes.wlanAssociationAttributes.wlanSignalQuality.ToString(); //This returns 5400 when the actual strength is ~99
WlanFreeMemory(ppData);
return sReturn;
}
else
{
throw new Exception("Unable to get interface connected SSID.");
}
誰かが私が間違っていることを見ますか?前もって感謝します!
解決
私はついにそれを修正しました。 wlan_association_attributesのレイアウトキンドを設定して、charsetをunicodeに明示して設定する必要がありました。
[StructLayout(LayoutKind.Explicit, CharSet = CharSet.Unicode)]
private struct WLAN_ASSOCIATION_ATTRIBUTES
{
/// <summary>
/// A DOT11_SSID structure that contains the SSID of the association.
/// </summary>
[FieldOffset(0)]
public DOT11_SSID dot11Ssid;
/// <summary>
/// A DOT11_BSS_TYPE value that specifies whether the network is infrastructure or ad hoc.
/// </summary>
[FieldOffset(0x24)]
public DOT11_BSS_TYPE dot11BssType;
/// <summary>
/// A DOT11_MAC_ADDRESS that contains the BSSID of the association.
/// </summary>
[FieldOffset(40)]
public DOT11_MAC_ADDRESS dot11Bssid;
/// <summary>
/// A DOT11_PHY_TYPE value that indicates the physical type of the association
/// </summary>
[FieldOffset(0x30)]
public DOT11_PHY_TYPE dot11PhyType;
/// <summary>
/// The position of the DOT11_PHY_TYPE value in the structure containing the list of PHY types.
/// </summary>
[FieldOffset(0x34)]
public ulong uDot11PhyIndex;
/// <summary>
/// A percentage value that represents the signal quality of the network.
/// </summary>
[FieldOffset(0x38)]
public Int32 wlanSignalQuality;
/// <summary>
/// Contains the receiving rate of the association.
/// </summary>
[FieldOffset(60)]
public ulong ulRxRate;
/// <summary>
/// Contains the transmission rate of the association.
/// </summary>
[FieldOffset(0x40)]
public ulong ulTxRate;
}
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