internal static KeyModification FromBuffer(byte[] buffer)
{
KeyModification modifyRequest = new KeyModification();
int bytesRead = 0;
int bytesRemained = buffer.Length;
if (bytesRemained >= sizeof(ushort))
{
modifyRequest.ModifyCount = BitConverter.ToUInt16(buffer, bytesRead);
bytesRead += sizeof(ushort);
bytesRemained -= sizeof(ushort);
if (bytesRemained >= modifyRequest.ModifyCount * 3 * sizeof(ushort))
{
modifyRequest.ModifyData = new KeyModifyData[modifyRequest.ModifyCount];
for (int i = 0; i < modifyRequest.ModifyCount; i++)
{
modifyRequest.ModifyData[i].KeyStatePredicates = (KeyboardKeyFlag)BitConverter.ToUInt16(buffer, bytesRead);
bytesRead += sizeof(ushort);
modifyRequest.ModifyData[i].FromScanCode = BitConverter.ToUInt16(buffer, bytesRead);
bytesRead += sizeof(ushort);
modifyRequest.ModifyData[i].ToScanCode = BitConverter.ToUInt16(buffer, bytesRead);
bytesRead += sizeof(ushort);
}
}
}
return(modifyRequest);
}
/// <summary>
/// Sets the key modifications for the currently active device.
/// </summary>
/// <param name="modifyRequest">Structure that contains the key modification data.</param>
public void KeyboardSetModification(KeyModification modifyRequest)
{
modifyRequest.RemoveRedundant();
if (modifyRequest.ModifyData == null || modifyRequest.ModifyData.Length == 0)
{
ushort modifyCount = 0;
if (!DeviceIoControl(_driverHandle, IOCTL_KEYBOARD_SET_MODIFY, ref modifyCount, sizeof(ushort), IntPtr.Zero, 0, out uint bytesReturned, IntPtr.Zero))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
else
{
var request = modifyRequest.GetBytes();
if (!DeviceIoControl(_driverHandle, IOCTL_KEYBOARD_SET_MODIFY, request, (uint)request.Length, IntPtr.Zero, 0, out uint bytesReturned, IntPtr.Zero))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
}
/// <summary>
/// Gets the key modification info of the currently active device.
/// </summary>
/// <returns></returns>
public KeyModification KeyboardGetKeyModifying()
{
KeyModification modifyRequest = new KeyModification();
if (!DeviceIoControl(_driverHandle, IOCTL_KEYBOARD_GET_MODIFY, IntPtr.Zero, 0, out ushort modifyCount, sizeof(ushort), out uint bytesReturned, IntPtr.Zero))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
modifyRequest.ModifyCount = modifyCount;
if (modifyRequest.ModifyCount > 0)
{
int outputSize = sizeof(ushort) + modifyRequest.ModifyCount * Marshal.SizeOf(typeof(KeyModifyData));
byte[] outputBuffer = new byte[outputSize];
if (!DeviceIoControl(_driverHandle, IOCTL_KEYBOARD_GET_MODIFY, IntPtr.Zero, 0, outputBuffer, (uint)outputSize, out bytesReturned, IntPtr.Zero))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
modifyRequest = KeyModification.FromBuffer(outputBuffer);
}
return(modifyRequest);
}
