Question

I have these classes:

Form1.cs

Server.cs

Now when I do in Server.cs

form1.startCapture("C:\\test.mp4");

Then in Form1.cs

public void startCapture(String filename)
    {
       short result = this.axVideoCap1.Start();
    }

I get then a System.AccessViolationException

System.Runtime.InteropServices.COMException was unhandled.
Message = An attempt was made to read or write protected memory. This is often an indication that other memory is corrupt.
Source = mscorlib
Stack Trace:
    at System.RuntimeType.ForwardCallToInvokeMember (String membername, BindingFlags flags, Object target, Int32 [] aWrapperTypes, Message & msgData)
    at VIDEOCAPLib._DVideoCap.Start ()
    at AxVIDEOCAPLib.AxVideoCap.Start ()
...

How can I solve this error?

public void startCapture(String filename)
    {

            this.axVideoCap1.CaptureVideo = this.captureVideoCheckBox.Checked;
            this.axVideoCap1.CaptureAudio = this.captureAudioCheckBox.Checked;

            this.axVideoCap1.ShowPreview = this.showPreviewCheckBox.Checked;
            this.axVideoCap1.UseVideoCompressor = this.useVideoCapCheckBox.Checked;
            this.axVideoCap1.UseAudioCompressor = this.useAudioCapCheckBox.Checked;

            this.axVideoCap1.CaptureMode = true;
            this.axVideoCap1.CaptureFileName = filename;

            this.axVideoCap1.SyncMode = 1;

            short result = this.axVideoCap1.Start();

            switch (result)
            {
                case -1:
                    MessageBox.Show("Capture Failure,Video, Audio Compressor not correct or capture file opening");
                    return;
                case -2:
                    MessageBox.Show("Capture file not found");
                    return;
            }

            this.previewButton.Enabled = false;
            this.captureButton.Enabled = false;
            this.stopButton.Enabled = true;

    }

Answer 1

I fixed it, I have run an infinite loop in Form1.
Form1 started Server and Server accessed Form1.
Now I created Start.cs that starts Server and Form1 in a second thread.

Needed some Invoke Callbacks