שיתוף | קוד #C לזיהוי גרסת Videoff המותקנת במחשב

[קומפיונט]

הקוד הבא מחזיר את גרסת הדרייבר של videoff המותקנת במחשב.

public static class VideoffDetector
{
    private const string VideoffPortName = "\\msdtghPort";

    public static bool TryGetVersion(out int? version)
    {
        return TryGetVersionByCommunicationPort(out version);
    }

    private static bool TryGetVersionByCommunicationPort(out int? version)
    {
        version = null;

        var hResult = FltLib.FilterConnectCommunicationPort(VideoffPortName, 0, 0, 0, 0, out var hPort);

        if (hResult != 0)
        {
            return false;
        }

        try
        {
            var input = BitConverter.GetBytes(1);
            var output = new byte[4];

            hResult = FltLib.FilterSendMessage(hPort, input, output);

            if (hResult != 0)
            {
                return false;
            }

            version = BitConverter.ToInt32(output);

            return true;
        }
        finally
        {
            Kernel32.CloseHandle(hPort);
        }
    }
}

internal static partial class FltLib
{
    private const string LibraryName = "FltLib";

    [LibraryImport(LibraryName, StringMarshalling = StringMarshalling.Utf16)]
    public static partial int FilterConnectCommunicationPort(string lpPortName, int dwOptions, nint lpContext, short wSizeOfContext, nint lpSecurityAttributes, out nint hPort);

    [LibraryImport(LibraryName, EntryPoint = "FilterSendMessage")]
    public static partial int FilterSendMessage(nint hPort, ReadOnlySpan<byte> lpInBuffer, int dwInBufferSize, ReadOnlySpan<byte> lpOutBuffer, int dwOutBufferSize, out uint lpBytesReturned);

    public static int FilterSendMessage(nint hPort, ReadOnlySpan<byte> lpInBuffer, ReadOnlySpan<byte> lpOutBuffer)
    {
        return FilterSendMessage(hPort, lpInBuffer, lpInBuffer.Length, lpOutBuffer, lpOutBuffer.Length, out _);
    }
}

internal static partial class Kernel32
{
    private const string LibraryName = "Kernel32";

    [LibraryImport(LibraryName)]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static partial bool CloseHandle(nint hObject);
}