Imaging problem

[akshah]

I m developing a remote surveillance system in C# which takes screenshots at 3 seconds and sends the image to the remote server.

The problem is after 7 to 8 screenshots(sometimes on the very first), I get an exception at the server of
Invalid parameter to MemoryStream

I m loading the byte buffer into the memory stream obj.

Thnx in advance 4 any help.

[kenobewan]

Are you closing the stream each time and disposing of the image?

[Motoma]

I m developing a remote surveillance system in C# which takes screenshots at 3 seconds and sends the image to the remote server.

The problem is after 7 to 8 screenshots(sometimes on the very first), I get an exception at the server of
Invalid parameter to MemoryStream

I m loading the byte buffer into the memory stream obj.

Thnx in advance 4 any help.

Welcome to The Scripts.
When the error occurs, what method are you calling? What are the objects you are passing to the MemoryStream object? Could we see the code where the error is occuring?

[akshah]

Welcome to The Scripts.
When the error occurs, what method are you calling? What are the objects you are passing to the MemoryStream object? Could we see the code where the error is occuring?

Sending Code -- At client side
public void Send()
{
Image img = Image.FromFile(@"C:\image.jpg");
MemoryStream ms = new MemoryStream();
img.Save(ms, ImageFormat.Jpeg);
byte[] buf2 = ms.GetBuffer();

byte[] buf = new byte[(buf2.Length/2) + 1];
for (int i = 0; i < buf2.Length; i++)
{
if (i % 2 == 0)
{
buf[i / 2] = buf2[i];
}
}

udpClient.Send(buf, buf.Length,"localhost",8001);
ms.Close();
img.Dispose();
}

************************************************** ***********************
//Receiving Code -- At the server side
public void Receive()
{
UdpClient udpClient = new UdpClient(8001);
while (true)
{
IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8001);

byte[] buf2 = udpClient.Receive(ref endPoint);

byte[] buf = new byte[buf2.Length * 2];
for (int i = 0; i < buf.Length; i+=2)
{
buf[i] = buf2[i/2];
buf[i+1]=buf2[i/2];
}
//The ERROR occurs in the following line: Invalid parameter
MemoryStream ms = new MemoryStream(buf);
Image img = Image.FromStream(ms);
Invoke(new UpdatePicBoxDelegate(UpdatePicBox), new object[] { img });

ms.Close();
}
}

[kenobewan]

Obviously, buf is the invalid parameter. I suggest writing buf value to see if it is valid. Then work backwards through a debugging procedure until the code works...

Hope that this helps.

[Motoma]

Obviously, buf is the invalid parameter. I suggest writing buf value to see if it is valid. Then work backwards through a debugging procedure until the code works...

Hope that this helps.

I concur.
Perhaps enclose it in a try...catch section, and report the typeof buf as well as the values when it fails.