public static bool IsNotificationForTargetDevice(Message m)
{
if (string.IsNullOrEmpty(devicepath))
{
return(false);
}
try
{
var devBroadcastDeviceInterface = new DevBroadcastDeviceinterface1();
var devBroadcastHeader = new DevBroadcastHdr();
try
{
Marshal.PtrToStructure(m.LParam, devBroadcastHeader);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
return(false);
}
// Is the notification event concerning a device interface?
if ((devBroadcastHeader.dbch_devicetype == Constants.DbtDevtypDeviceinterface))
{
// Get the device path name of the affected device
var stringSize = Convert.ToInt32((devBroadcastHeader.dbch_size - 32) / 2);
devBroadcastDeviceInterface.dbcc_name = new Char[stringSize + 1];
Marshal.PtrToStructure(m.LParam, devBroadcastDeviceInterface);
var deviceNameString = new string(devBroadcastDeviceInterface.dbcc_name, 0, stringSize);
// Compare the device name with our target device's pathname (strings are moved to lower case
return(string.Compare(deviceNameString.ToLower(), devicepath.ToLower(), StringComparison.OrdinalIgnoreCase) == 0);
}
}
catch (Exception ex)
{
Debug.WriteLine("usbGenericHidCommunication:isNotificationForTargetDevice() -> EXCEPTION: An unknown exception has occured!");
Debug.WriteLine(ex.Message);
return(false);
}
return(false);
}
private string GetDeviceName(Message m)
{
try
{
if (m.LParam == IntPtr.Zero)
{
return(null);
}
var devBroadcastDeviceInterface = new DevBroadcastDeviceinterface1();
var devBroadcastHeader = new DevBroadcastHdr();
try
{
Marshal.PtrToStructure(m.LParam, devBroadcastHeader);
}
catch (Exception ex)
{
LogHelper.Log.Error(ex.Message);
}
// Is the notification event concerning a device interface?
if ((devBroadcastHeader.dbch_devicetype == Constants.DbtDevtypDeviceinterface))
{
// Get the device path name of the affected device
var stringSize = Convert.ToInt32((devBroadcastHeader.dbch_size - 32) / 2);
devBroadcastDeviceInterface.dbcc_name = new Char[stringSize + 1];
Marshal.PtrToStructure(m.LParam, devBroadcastDeviceInterface);
var deviceNameString = new string(devBroadcastDeviceInterface.dbcc_name, 0, stringSize);
return(deviceNameString);
// Compare the device name with our target device's pathname (strings are moved to lower case
//return (string.Compare(deviceNameString.ToLower(), devicepath.ToLower(), StringComparison.OrdinalIgnoreCase) == 0);
}
}
catch (Exception ex)
{
LogHelper.Log.Error("GetDeviceName(Message m) -> 发生异常:", ex);
}
return(null);
}
/// <summary>
/// Compares two device path names. Used to find out if the device name
/// of a recently attached or removed device matches the name of a
/// device the application is communicating with.
/// </summary>
///
/// <param name="m"> a WM_DEVICECHANGE message. A call to RegisterDeviceNotification
/// causes WM_DEVICECHANGE messages to be passed to an OnDeviceChange routine.. </param>
/// <param name="mydevicePathName"> a device pathname returned by
/// SetupDiGetDeviceInterfaceDetail in an SP_DEVICE_INTERFACE_DETAIL_DATA structure. </param>
///
/// <returns>
/// True if the names match, False if not.
/// </returns>
///
internal Boolean DeviceNameMatch(Message m, String mydevicePathName)
{
var devBroadcastDeviceInterface = new DevBroadcastDeviceinterface1();
var devBroadcastHeader = new DevBroadcastHdr();
// The LParam parameter of Message is a pointer to a DEV_BROADCAST_HDR structure.
Marshal.PtrToStructure(m.LParam, devBroadcastHeader);
if ((devBroadcastHeader.dbch_devicetype == DbtDevtypDeviceinterface))
{
// The dbch_devicetype parameter indicates that the event applies to a device interface.
// So the structure in LParam is actually a DEV_BROADCAST_INTERFACE structure,
// which begins with a DEV_BROADCAST_HDR.
// Obtain the number of characters in dbch_name by subtracting the 32 bytes
// in the strucutre that are not part of dbch_name and dividing by 2 because there are
// 2 bytes per character.
var stringSize = Convert.ToInt32((devBroadcastHeader.dbch_size - 32) / 2);
// The dbcc_name parameter of devBroadcastDeviceInterface contains the device name.
// Trim dbcc_name to match the size of the String.
devBroadcastDeviceInterface.dbcc_name = new Char[stringSize + 1];
// Marshal data from the unmanaged block pointed to by m.LParam
// to the managed object devBroadcastDeviceInterface.
Marshal.PtrToStructure(m.LParam, devBroadcastDeviceInterface);
// Store the device name in a String.
var deviceNameString = new String(devBroadcastDeviceInterface.dbcc_name, 0, stringSize);
// Compare the name of the newly attached device with the name of the device
// the application is accessing (mydevicePathName).
// Set ignorecase True.
return(String.Compare(deviceNameString, mydevicePathName, StringComparison.OrdinalIgnoreCase) == 0);
}
return(false);
}
/// <summary>
/// Compares two device path names. Used to find out if the device name
/// of a recently attached or removed device matches the name of a
/// device the application is communicating with.
/// </summary>
///
/// <param name="m"> a WM_DEVICECHANGE message. A call to RegisterDeviceNotification
/// causes WM_DEVICECHANGE messages to be passed to an OnDeviceChange routine.. </param>
/// <param name="mydevicePathName"> a device pathname returned by
/// SetupDiGetDeviceInterfaceDetail in an SP_DEVICE_INTERFACE_DETAIL_DATA structure. </param>
///
/// <returns>
/// True if the names match, False if not.
/// </returns>
///
internal Boolean DeviceNameMatch(Message m, String mydevicePathName)
{
var devBroadcastDeviceInterface = new DevBroadcastDeviceinterface1();
var devBroadcastHeader = new DevBroadcastHdr();
// The LParam parameter of Message is a pointer to a DEV_BROADCAST_HDR structure.
Marshal.PtrToStructure(m.LParam, devBroadcastHeader);
if ((devBroadcastHeader.dbch_devicetype == DbtDevtypDeviceinterface))
{
// The dbch_devicetype parameter indicates that the event applies to a device interface.
// So the structure in LParam is actually a DEV_BROADCAST_INTERFACE structure,
// which begins with a DEV_BROADCAST_HDR.
// Obtain the number of characters in dbch_name by subtracting the 32 bytes
// in the strucutre that are not part of dbch_name and dividing by 2 because there are
// 2 bytes per character.
var stringSize = Convert.ToInt32((devBroadcastHeader.dbch_size - 32) / 2);
// The dbcc_name parameter of devBroadcastDeviceInterface contains the device name.
// Trim dbcc_name to match the size of the String.
devBroadcastDeviceInterface.dbcc_name = new Char[stringSize + 1];
// Marshal data from the unmanaged block pointed to by m.LParam
// to the managed object devBroadcastDeviceInterface.
Marshal.PtrToStructure(m.LParam, devBroadcastDeviceInterface);
// Store the device name in a String.
var deviceNameString = new String(devBroadcastDeviceInterface.dbcc_name, 0, stringSize);
// Compare the name of the newly attached device with the name of the device
// the application is accessing (mydevicePathName).
// Set ignorecase True.
return (String.Compare(deviceNameString, mydevicePathName, StringComparison.OrdinalIgnoreCase) == 0);
}
return false;
}
