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Unread 02-08-2010, 04:32 PM
PranavSathy PranavSathy is offline
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Re: Displaying Camera Image in C# Dashboard
The Dashboard Code from LabVIEW doesnt help at all , ive read through the whole thing countless times, the PCVideoServer.cpp I have also read through that code,infact I am sitting right in front of it lol, that is why there is a if(readBytes > 1000) code, it makes sure I am not sending the header or imageSize as parameters to the MemoryStream, actually after much testing, i got the image to display at about .01 fps rofl, it updates the image irregularly and it is lagging BEYONG belief, here is my current code for that image processing:

Code:
if (netStream.DataAvailable)
                {
                    image.indicator.Text = "Data Available";
                    //image.videoStream.Image = Image.FromStream(netStream);
                    data = new byte[serverClient.ReceiveBufferSize];
                    
                    //bytesRead = netStream.Read(data, 0, serverClient.ReceiveBufferSize);
                    bytesRead = client.Receive(data, 0, serverClient.ReceiveBufferSize, 0);
                    //tw.WriteLine(DateTime.Now + " " + bytesRead.ToString());
                    if (bytesRead > 1000)
                    {
                        try
                        {
                            MemoryStream ms = new MemoryStream(data);
                            image.videoStream.Image = Image.FromStream(ms, false, true);
                        }
                        catch (Exception ex)
                        {
                            tw.WriteLine(DateTime.Now + ex.ToString());
                        }
                    }
                }
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Unread 02-08-2010, 04:38 PM
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Re: Displaying Camera Image in C# Dashboard
Quote:
Originally Posted by PranavSathy View Post
The Dashboard Code from LabVIEW doesnt help at all , ive read through the whole thing countless times, the PCVideoServer.cpp I have also read through that code,infact I am sitting right in front of it lol, that is why there is a if(readBytes > 1000) code, it makes sure I am not sending the header or imageSize as parameters to the MemoryStream, actually after much testing, i got the image to display at about .01 fps rofl, it updates the image irregularly and it is lagging BEYONG belief, here is my current code for that image processing:
The problem is that you're just randomly grabbing chunks of data > 1000 bytes in length, throwing it into an image, and hoping that everything lines up correctly.

I would recommend reading 8 bytes first, and look for the 0x01,0x00,0x00,x00 header in the first 4. If that's there, read the length from the next 4 bytes. Then, read in that number of bytes from your networkstream, and pass it into Image.FromStream(). Repeat.
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Unread 02-08-2010, 04:46 PM
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Re: Displaying Camera Image in C# Dashboard
What I meant was that the data you are giving image.fromstream is NOT in the format it accepts.
ex:
asdfghjkl is the image data it expects, and you are sending it something else, like 10000009asdfghjkl or a different encoding (but it should be fine if it is a JPEG)
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Unread 02-08-2010, 04:47 PM
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Re: Displaying Camera Image in C# Dashboard
I hope you dont mind me asking, but can you give me the example for the code for that, becuase from what I have logged, as in BYTES READ, the amount varies, this what an example would look like, this is from my log file:
Code:
2/9/2010 4:53:35 AM StartStream()
2/9/2010 4:53:35 AM Connecting!
2/9/2010 4:53:35 AM Connected
2/9/2010 4:53:36 AM 8192
2/9/2010 4:53:36 AM 8192
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As you can see, there is no consistency to where the 4 is. Also , these numbers are the amount of bytes read
Last edited by PranavSathy : 02-08-2010 at 04:54 PM.
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Unread 02-08-2010, 04:58 PM
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Re: Displaying Camera Image in C# Dashboard
depending on the image, the size varies, because JPEG is a compressed format
for example, a pure black image will be much smaller than a picture where every pixel is a different color
Edit: look at the attachment sizes
Attached Thumbnails
Click image for larger version Name: test.jpg Views: 7 Size: 1.1 KB ID: 8560  Click image for larger version Name: plasma.jpg Views: 12 Size: 47.2 KB ID: 8561  
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Last edited by byteit101 : 02-08-2010 at 05:02 PM. Reason: added sample
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Unread 02-08-2010, 05:00 PM
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Re: Displaying Camera Image in C# Dashboard
Ok, even with a code that just read 8 bytes at a time, not a single string that I printed into the log had a NUMBER or a 0x00 or whatever the header was, they were all messed up jumbles of characters. I honestly am stuck here, as the image displays once and then doesnot update for anotehr few minutes, then updates, few minutes, one more frame, few minutes, one more frame etc. on and on.
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Unread 02-08-2010, 05:04 PM
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Re: Displaying Camera Image in C# Dashboard
look at it in a byte array, you should see a 1 then 0 0 0 etc...
in a string, this would be a box followed by \0\0\0 (but only in the debugger, output is cut by \0
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Unread 02-08-2010, 05:06 PM
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Re: Displaying Camera Image in C# Dashboard
I did :d, I went through the entire output, I simple just wrote the entire byte array as a string into the log file, there was no 1\0\0\0 in the whole log file.

I also looked for \0. I found one of those in every output, as expected, but not in the beginning of the byte array, they were found near the middle of each one. Also only a few of them were followed by a number like 5, or 4, or 7.
Last edited by PranavSathy : 02-08-2010 at 05:11 PM.
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