Question

我已在RegisterDeviceNotification注册了一个窗口，可以成功收到DEV_BROADCAST_DEVICEINTERFACE条消息。但是，返回的结构中的dbcc_name字段始终为空。我所拥有的结构定义如下：

[StructLayout(LayoutKind.Sequential)]
public struct DEV_BROADCAST_DEVICEINTERFACE
{
    public int dbcc_size;
    public int dbcc_devicetype;
    public int dbcc_reserved;
    public Guid dbcc_classguid;
    [MarshalAs(UnmanagedType.LPStr)]
    public string dbcc_name;
}

我在WM_DEVICECHANGE消息的LParam上使用Marshal.PtrToStructure。

这应该有用吗？

甚至更好......有没有其他方法可以在连接时获取设备的名称？

编辑（02/05/2010 20：56GMT）：

我发现如何通过执行以下操作来填充dbcc_name字段：

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct DEV_BROADCAST_DEVICEINTERFACE
{
    public int dbcc_size;
    public int dbcc_devicetype;
    public int dbcc_reserved;
    public Guid dbcc_classguid;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst=255)]
    public string dbcc_name;
}

但是我仍然需要一种从int dbcc_name获取“友好”名称的方法。它看起来如下：

\ \ USB＃VID_05AC＆安培; PID_1294＆安培; MI_00＃0＃{6bdd1fc6-810f-11D0-BEC7-08002BE2092F}

我真的只想说“Apple iPhone”（在这种情况下就是设备）。

Answer 1

好吧，如上所述，我发现了如何正确填充dbcc_name。我发现这是获取设备名称的最简单方法：

private static string GetDeviceName(DEV_BROADCAST_DEVICEINTERFACE dvi)
{
    string[] Parts = dvi.dbcc_name.Split('#');
    if (Parts.Length >= 3)
    {
        string DevType = Parts[0].Substring(Parts[0].IndexOf(@"?\") + 2);
        string DeviceInstanceId = Parts[1];
        string DeviceUniqueID = Parts[2];
        string RegPath = @"SYSTEM\CurrentControlSet\Enum\" + DevType + "\\" + DeviceInstanceId + "\\" + DeviceUniqueID;
        RegistryKey key = Registry.LocalMachine.OpenSubKey(RegPath);
        if (key != null)
        {
            object result = key.GetValue("FriendlyName");
            if (result != null)
                return result.ToString();
            result = key.GetValue("DeviceDesc");
            if (result != null)
                return result.ToString();
        }
    }
    return String.Empty;
}

Answer 2

此信息也可以通过SetupAPI更正式地获取。将dbcc_name传递给SetupDiOpenDeviceInterface，并通过SetupDiGetDeviceRegistryProperty SPDRP_FRIENDLYNAME获取友好名称。

这是一些Delphi代码。（对不起，你必须独立翻译成C＃。）

function ConvertDbccNameToFriendlyName(aDeviceInterfaceDbccName : string) : string;
var
  deviceInfoHandle : HDEVINFO;
  deviceInfoData : SP_DEVINFO_DATA;
  deviceInterfaceData : SP_DEVICE_INTERFACE_DATA;
  deviceInstanceId : string;
  memberIndex : Cardinal;
begin
  result := '';

  // Create a new empty "device info set"
  deviceInfoHandle := SetupDiCreateDeviceInfoList(nil, 0);
  if deviceInfoHandle <> INVALID_HANDLE_VALUE then
  begin
    try
      // Add "aDeviceInterfaceDbccName" to the device info set
      FillChar(deviceInterfaceData, SizeOf(deviceInterfaceData), 0);
      deviceInterfaceData.cbSize := SizeOf(deviceInterfaceData);
      if SetupDiOpenDeviceInterface(deviceInfoHandle, PChar(aDeviceInterfaceDbccName),     0, @deviceInterfaceData) then
      begin
        try
          // iterate over the device info set
          // (though I only expect it to contain one item)
          memberIndex := 0;
          while true do
          begin
            // get device info that corresponds to the next memberIndex
            FillChar(deviceInfoData, SizeOf(deviceInfoData), 0);
            deviceInfoData.cbSize := SizeOf(deviceInfoData);
            if not SetupDiEnumDeviceInfo(deviceInfoHandle, memberIndex, deviceInfoData) then
            begin
              // The enumerator is exhausted when SetupDiEnumDeviceInfo returns false
              break;
            end
            else
            begin
              Inc(memberIndex);
            end;

            // Get the friendly name for that device info
            if TryGetDeviceFriendlyName(deviceInfoHandle, deviceInfoData, {out} friendlyName) then
            begin
              result := friendlyName;
              break;
            end;
          end;
        finally
          SetupDiDeleteDeviceInterfaceData(deviceInfoHandle, deviceInterfaceData);
        end;
      end;
    finally
      SetupDiDestroyDeviceInfoList(deviceInfoHandle);
    end;
  end;
end;

function TryGetDeviceFriendlyName(
  var aDeviceInfoHandle : HDEVINFO;
  var aDeviceInfoData : SP_DEVINFO_DATA;
  out aFriendlyName : string) : boolean;
var
  valueBuffer : array of byte;
  regProperty : Cardinal;
  propertyRegDataType : DWord;
  friendlyNameByteSize : Cardinal;
  success : boolean;
begin
  aFriendlyName := '';
  result := false;

  // Get the size of the friendly device name
  regProperty := SPDRP_FRIENDLYNAME;
  friendlyNameByteSize := 0;
  SetupDiGetDeviceRegistryProperty(
    aDeviceInfoHandle,     // handle to device information set
    aDeviceInfoData,       // pointer to SP_DEVINFO_DATA structure
    regProperty,           // property to be retrieved
    propertyRegDataType,   // pointer to variable that receives the data type of the property
    nil,                   // pointer to PropertyBuffer that receives the property
    0,                     // size, in bytes, of the PropertyBuffer buffer.
    friendlyNameByteSize); // pointer to variable that receives the required size of PropertyBuffer

  // Prepare a buffer for the friendly device name (plus space for a null terminator)
  SetLength(valueBuffer, friendlyNameByteSize + sizeof(char));

  success := SetupDiGetDeviceRegistryProperty(
    aDeviceInfoHandle,
    aDeviceInfoData,
    regProperty,
    propertyRegDataType,
    @valueBuffer[0],
    friendlyNameByteSize,
    friendlyNameByteSize);

  if success then
  begin
    // Ensure that only 'friendlyNameByteSize' bytes are used.
    // Ensure that the string is null-terminated.
    PChar(@valueBuffer[friendlyNameByteSize])^ := char(0);

    // Get the returned value as a string
    aFriendlyName := StrPas(PChar(@valueBuffer[0]));
  end;

  result := success;
end;

最后......如果您需要一种唯一识别USB设备的方法（不是您要求的，但通常也需要这样），请查看SetupDiGetDeviceInstanceId。

Answer 3

您可能需要稍微更改

[StructLayout(LayoutKind.Sequential)]
public struct DEV_BROADCAST_DEVICEINTERFACE
{
    public int dbcc_size;
    public int dbcc_devicetype;
    public int dbcc_reserved;
    public Guid dbcc_classguid;
    [MarshalAs(UnmanagedType.LPStr)]
    public StringBuilder dbcc_name;
}

将dbcc_size设置为255，并构造StringBuilder，如下所示：

DEV_BROADCAST_DEVICEINTERFACE dbd = new DEV_BROADCAST_DEVICEINTERFACE;
dbd.dbcc_size = 255;
dbd.dbcc_name = new StringBuilder(dbd.dbcc_size);

然后传递该结构，应填充dbcc_name的值。

在 snicker 的评论之后

编辑 ...我想到了另一种方式......

public struct DEV_BROADCAST_DEVICEINTERFACE
{
    public int dbcc_size;
    public int dbcc_devicetype;
    public int dbcc_reserved;
    public Guid dbcc_classguid;
[System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst = 255, ArraySubType = System.Runtime.InteropServices.UnmanagedType.LPArray)]
    public string dbcc_name;
}

将dbcc_size设置为255，然后从那里取出......

编辑＃2：这很有趣......我现在不太确定，我发现这篇文章在Codeproject上使用了RegisterDeviceNotification，它使用了另一种方式RegisterDeviceNotification，结构被编组到IntPtr并用于调用API ...

如何从DEV_BROADCAST_DEVICEINTERFACE和设备实例ID获取友好设备名称

3 个答案: