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I have a WCF web service (https). Inside of that web service, I call another 3rd party web service (http) and get a large amount of data back (12MB) -- a jpg image. The client is getting an exception during my processing of that image: An existing connection was forcibly closed by the remote host. I've put logs on every line in the method and tracked it down to:
gr.DrawImageUnscaledAndClipped(img, rect);
IIS just simply kicks out the process during this call. I've tried wrapping this call in a try / catch to see the real exception, but its not throwing an exception, just simply kills the client's call with the above exception.
Anybody ever seen this before?
img is quite large jpg 32bit (9MB), 14,800 x 14,800 and the drawing surface is 15000 x 15465.
I was able to draw this large when I was calling the 3rd party web service via REST, but had to switch over to thier WCF version for added functionality. This of course comes with added overhead (img is transmitted as base64 vs. just a binary stream) and it requires running in an STA thread for some unknown reason.
I watched the server in task manager and the process craps out with the memory at about 1GB. It has gone higher then that with the REST version. I was able to process about 8 of these images at a time. Now I cannot process even 1 at a time.
The server is 64bit and has 18GB of RAM with only 11% consumed at idle.
If I comment out the DrawImage call, I get the 15000 x 15465 image back in its processed state (minus of course the content).
Any ideas? Why is IIS killing my call without even throwing an exception on the server side?
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On what exactly do you try and draw the image?
I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is. (V)
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Hi,
Just a normal Bitmap:
Bitmap bmp = new Bitmap(cx, cy + 465);
using (Graphics gr = Graphics.FromImage(bmp))
{
gr.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, cx, cy + 465);
Rectangle rect = new Rectangle((cx - img.Width) / 2, 465 + ((cy - img.Height) / 2), img.Width, img.Height);
gr.DrawImage(img, rect.Left, rect.Top);
gr.DrawImage(Properties.Resources.Header, 0, 0, cx, 465);
The second DrawImage call works fine, but thats a smaller image.
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Yes, but you are inside a web service, so on what UI are you drawing the image?
I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is. (V)
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There is no UI. The client calls my web service. My web service calls the 3rd party web service to get a jpg. I then do some post processing and return it to the client as a byte array. My web service is a wrapper around the 3rd party web service. The post processing is where my issue is. The jpg from the 3rd party service is 14800x14800. I create a 15000x15465 bitmap and draw the other bitmap onto this bitmap and draw some other stuff as well. All the annotations are drawing correctly. It is the gr.DrawImage() call that is crapping out the clients web service call for some reason. It didn't when I was using a different version of the 3rd party service.
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Did you checked the image you got from the 3rd party? Can it be defected?
I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is. (V)
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Do a simple test: your web service receives the base64 encoded image from the ThridParty WCF service, creates a "real" image from it, and sends it to the client. Now open it on the client: does that work? Does the image look as you expected it?
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Yup. Tried saving out the image and it looks fine. The Base64 string is 12MB and the decoded image is 9MB, so I don't know if I'm running out of memory. The other version of the service, the REST one, just returned the image as a stream, so I didn't have the 12MB of extra stuff. I can't even create the 15000x15465 drawing surface on my dev machine as it runs out of memory (even with the old REST implementation that ran fine on the web server). On my dev machine though, at least I get an exception when I try to create the drawing surface. On the web server, there is no exception, IIS just closes the connection?!?
Weird though, the 12MB is in a String so it should be in the managed heap while the Image is all in the unmanaged heap, right?
I was watching Task Manager during the call and the memory usage went up to 1GB when IIS killed it. I don't have any limits set. I've seen the memory go up to 2 or 3GB with the working REST implementation (had 8 threads going on the client -- so 8 simultaneous calls into IIS and it didn't run out of memory or kill connections).
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SledgeHammer01 wrote: so I don't know if I'm running out of memory.
A bitmap with that depth and size - create one using a paint-application, save it and check it's size.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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That looks like just below 900MB.
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Hello. I have problem to execute UPDATE query in C# winforms app. I have a table without primary key. When I select a row in listview, records will show in textboxes, and i change text in textboxes and click update, it should update this row, but did not work. I dont know where is problem. Thanks a lot
Inserting and deleting is OK.
private void button3_Click(object sender, EventArgs e)
{
SqlCeCommand cu = new SqlCeCommand("UPDATE tblUsers SET userName = @userName, age = @age WHERE userName = @userName", cn);
cu.Parameters.AddWithValue("@userName", textBox1.Text);
cu.Parameters.AddWithValue("@age", textBox2.Text);
try
{
cu.ExecuteNonQuery();
Populate();
}
catch (SqlCeException excd)
{ MessageBox.Show(excd.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error); }
}
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You are setting usrname to "Pete" everywhere there's a record called "Pete". Unless you're changing the username to what it already is, it will not update.
I suggest you research what a primary key is, what it does, and why you would want one.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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Hi friends,
I am working on a biomedical application. I need to import a 3D model
of heart and displaying it after rotation. I use C# and the model is
stored in a 3ds file (I have an obj file,too). I don't need high
performance, engines. I just need the simplest engine for rotating and
displaying this model.
I was wondering if you could help me.
I am looking forward to hearing from you,
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If you're working with 3D and want to be able to use C# with it, I would take a look at Unity. It has all the functionality you will need, and then some.
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It might be easier to just export the 3D model to a 3D PDF file. It can then be viewed and rotated with the standard Adobe PDF reader.
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Such a solution works for me. the format is not important. How can I do it?
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Hello i am doing a pos system application in that i have to attach a pole display /customer display but I dont have any idea about it. please can any body suggest me a solution.
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It is going to be difficult to help with the limited information you have supplied.
I would add a display table to the database, when an items is stocked to the floor the staff will need to register the item to the display, the pos system can then track the stock level at a display.
Never underestimate the power of human stupidity
RAH
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Do you have such a display to test on? if so have you looked at the documentation or even looked at code samples for the device? I would think that most of these types of equipment would come with an SDK etc.
Every day, thousands of innocent plants are killed by vegetarians.
Help end the violence EAT BACON
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Hi guys!
There a two things i wish to know.
Lets start with the creation of an msi file that installs my service.
I have added a simple setup project to my solution (VS 2010).
But when i start my setup i got asked for an location where the "application" should be installed. My setup copies than the binary of my service to that location. I am talking about the file that you need to install the service with installutil. But I dont need it, cause the setup project already installs this service. What i am doing wrong?
Lets step to my next question.
My service needs some parameters when it starts. Now (maybe influenced by the situation described above), i want that the user can provide a location when he installs the service. In this location a config file shall be stored (a xml file that is easily to understand an editable for most user). How can i realize this? Including the config file in my project and set its property to "Copy to output path"="Always" didnt help. And what about the installation path? It is possible that my service can fetch the information about the path? The service itself wont be located in this path, so i assume that
Assembly.GetExecutingAssembly wont help.
Any ideas`?
Jeff
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Your description is so weird that I doubt you understand what you do.
It is rather normal that the setup program will ask you where to install the program - that holds true for desktop applications and services as well. You may provide a useful default value for that.
Startup parameters are rather unusual for a service, though in rare case can be useful and e.g. added on the properties page of the servcie for the next start (and only the next manual start from that tab - not as a general parameter!). What you describe is a configuration. For configuration, there is the Application Configuration file. In your Visual Studio, it is the app.config file. When the program gets built, it becomes yourservcie.exe.config. That's the place where to add configurable items. When you changed the entries e.g. in a text editor, do not forget to re-start the service. If you have another program interacting with your service which could be used for configuring it, use Settings.
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Quote: It is rather normal that the setup program will ask you where to install the program - that holds true for desktop applications and services as well. You may provide a useful default value for that.
Oh yeah, i was wrong. I was believing that in contrast to applications, windows services dont need installation locations, cause they will be automatically stored in a windows specific folder that is designed for services.
That belief was created by the message prompt that was shown to me by double clicking the executable file my setup created in the installation location.
I was believing that this executable file is only needed for installing purposes.
But given that this executable file represents the service, it is of course able to use
Directory.GetParent(System.Reflection.Assembly.GetExecutingAssembly().Location).FullName to get the correct location of the config file.
For your information:
Im using the XmlSerializer-Class to realize a config file that corresponds to my own config-class. I really like this way.
So thank you!
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hi frndz,
as per u suggested i have installed k lite mega codec packon my 32 bit windows 7 system but still i m getting same problem in video steganography code:
if(getFrameObject == 0){ throw new Exception("Exception in AVIStreamGetFrameOpen!"); }
please help me. 
krrish8891
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I am able to find the Parent Window but I would like to have the list of all its Child Windows, in order to find their Class Name & Window Name, can anyone help?
I have used:
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string lclassName, string windowTitle);
[DllImport("user32.dll")]
private static extern IntPtr FindWindow(string className, string windowName);
Thanks in-advanced 
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...and?
You build your own list. There is no function that returns the entire child window handles tree. You have to build it yourself.
I suggest reading the documentation on the EnumChildWindows[^] function.
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