Using CaptureFileWriterDevice

[xeron333]

Hello,
I would like to use the example describing writing captures to a file.
I have a problem with:
private static void device_OnPacketArrival(object sender, PacketCapture e)
var rawPacket = e.GetPacket();
CaptureFileWriterDevice captureFileWriter = new CaptureFileWriterDevice("Captures", FileMode.OpenOrCreate);
captureFileWriter.Write(rawPacket);

And i have a problem with captureFileWriter.Write(rawPacket)
with error "SharpPcap.DeviceNotReadyException : 'Cannot dump packet, device is not opened" from i think

public void Write(ReadOnlySpan<byte> p, ref PcapHeader h)` from class "CaptureFileWriterDevice".

I don't know what to do to resolve this problem, which I think comes from the configuration required to write data to a file. If anyone knows how to do it, please contact me.

[kayoub5]

@xeron333 please include full code example

[xeron333]

thanks for your response,
Now I managed to write with the Capture FileWriter Device, using open but when I exit the program the file is empty.

private static void device_OnPacketArrival(object sender, PacketCapture e)
{
var time = e.Header.Timeval.Date;
var len = e.Data.Length;
var data = e.Data;
var rawPacket = e.GetPacket();
string path = "C:\Users\Documents\Captures.pcap";
string nomFic = "Captures.pcap";
if (!File.Exists(path))
{
File.Create(path);
}
CaptureFileWriterDevice captureFileWriter = new CaptureFileWriterDevice(nomFic, (FileMode.OpenOrCreate))
captureFileWriter.Open();
captureFileWriter.Write(data);
Console.WriteLine("Packet dumped to file.");
}`

[kayoub5]

you need to close the device at the end

[kayoub5]

and don't create the file, that's the writer job

[xeron333]

Thaks it is ok now, However I am trying to read this .pcap file, do you want me to post the question on this topic or not?

[kayoub5]

different topic = different discussion