Want screen capture of server desktop

TerryWilson

I am developing a web based service tool using asp.net that we will distribute with
our product. This service tool will be used for remotely configuring the product, problem
determination, etc. One thing that I would like to be able to do is display a screen
capture of our product running. I have the code to get the screen capture of the
desktop and I also know how to send the image back to the client to be displayed.
The problem is that the code to grab the desktop image doesn't work when running
in my asp.net code on the server.

From what I have read on the subject, I suspect the problem is that the web server
is running under its own virtual desktop. If so can someone tell me if what I am
trying to do is even possible and if so how. The code I am using is as follows:
(I believe gr1.GetHdc() is where things start to fail).

System.Drawing.Image myImage = new Bitmap(1600, 1200);
Graphics gr1 = Graphics.FromImage(myImage);
IntPtr dc1 = gr1.GetHdc();
IntPtr dc2 = GetWindowDC(GetDesktopWindow());
BitBlt(dc1, 0, 0, 1600, 1200, dc2, 0, 0, 13369376);

Response.BufferOutput=true;
Response.Clear();
Response.ContentType="image/gif";
myImage.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);
Response.End();

Thanks,

Terry

Nov 18 '05 #1

Bruno Sirianni

I think that you can't get a printscreen on server because the server is
logged off.
You can try changing IIS service property. You can try to check Allow
Interact with desktop flag.

Brun

"Te*********@tech.com" <an*******@discussions.microsoft.com> wrote in
message news:07**********************************@microsof t.com...

I am developing a web based service tool using asp.net that we will distribute with our product. This service tool will be used for remotely configuring the product, problem determination, etc. One thing that I would like to be able to do is display a screen capture of our product running. I have the code to get the screen capture of the desktop and I also know how to send the image back to the client to be displayed. The problem is that the code to grab the desktop image doesn't work when running in my asp.net code on the server.

From what I have read on the subject, I suspect the problem is that the web server is running under its own virtual desktop. If so can someone tell me if what I am trying to do is even possible and if so how. The code I am using is as follows: (I believe gr1.GetHdc() is where things start to fail).

System.Drawing.Image myImage = new Bitmap(1600, 1200);
Graphics gr1 = Graphics.FromImage(myImage);
IntPtr dc1 = gr1.GetHdc();
IntPtr dc2 = GetWindowDC(GetDesktopWindow());
BitBlt(dc1, 0, 0, 1600, 1200, dc2, 0, 0, 13369376);

Response.BufferOutput=true;
Response.Clear();
Response.ContentType="image/gif";
myImage.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif); Response.End();

Thanks,

Terry

Nov 18 '05 #2

one

You will probably find more expert at this newsgroup

microsoft.public.dotnet.framework.drawing

Nov 18 '05 #3

TerryWilson

I am not sure what you mean by "the server is logged off". In this case,
our product will be running on the server at the time I wish to do the screen
capture, so it will have been logged onto by someone.

I did try checking "Allow Interact with desktop flag" for the WWW Publishing
service but that didn't seem to help ... is there another service I should also
be checking that flag for?

Terry

----- Bruno Sirianni wrote: -----

I think that you can't get a printscreen on server because the server is
logged off.
You can try changing IIS service property. You can try to check Allow
Interact with desktop flag.

Brun

"Te*********@tech.com" <an*******@discussions.microsoft.com> wrote in
message news:07**********************************@microsof t.com...

I am developing a web based service tool using asp.net that we will distribute with our product. This service tool will be used for remotely configuring the product, problem determination, etc. One thing that I would like to be able to do is display a screen capture of our product running. I have the code to get the screen capture of the desktop and I also know how to send the image back to the client to be displayed. The problem is that the code to grab the desktop image doesn't work when running in my asp.net code on the server.

From what I have read on the subject, I suspect the problem is that the

web server is running under its own virtual desktop. If so can someone tell me if what I am trying to do is even possible and if so how. The code I am using is as follows: (I believe gr1.GetHdc() is where things start to fail).

System.Drawing.Image myImage = new Bitmap(1600, 1200); Graphics gr1 = Graphics.FromImage(myImage);
IntPtr dc1 = gr1.GetHdc();
IntPtr dc2 = GetWindowDC(GetDesktopWindow());
BitBlt(dc1, 0, 0, 1600, 1200, dc2, 0, 0, 13369376);

Response.BufferOutput=true;

Response.Clear();
Response.ContentType="image/gif";
myImage.Save(Response.OutputStream,

System.Drawing.Imaging.ImageFormat.Gif); Response.End();

Thanks,
Terry

Nov 18 '05 #4

Bruno Sirianni

I have tryed yuor code and read MSDN documentation.

gr1.GetHdc() return the device context for a Windows GDI-based structure.
ASP.NET is not in a windows form!!

You can try making a simple form application that do this.
You can run this exe and then get the image...

Brun

"Te*********@tech.com" <an*******@discussions.microsoft.com> wrote in
message news:CE**********************************@microsof t.com...

I am not sure what you mean by "the server is logged off". In this case,
our product will be running on the server at the time I wish to do the screen capture, so it will have been logged onto by someone.

I did try checking "Allow Interact with desktop flag" for the WWW Publishing service but that didn't seem to help ... is there another service I should also be checking that flag for?

Terry

----- Bruno Sirianni wrote: -----

I think that you can't get a printscreen on server because the server is logged off.
You can try changing IIS service property. You can try to check Allow
Interact with desktop flag.

Brun

"Te*********@tech.com" <an*******@discussions.microsoft.com> wrote in
message news:07**********************************@microsof t.com...

> I am developing a web based service tool using asp.net that we will distribute with

> our product. This service tool will be used for remotely

configuring the product, problem

> determination, etc. One thing that I would like to be able to do

is display a screen

> capture of our product running. I have the code to get the screen

capture of the

> desktop and I also know how to send the image back to the client to

be displayed.

> The problem is that the code to grab the desktop image doesn't work

when running

> in my asp.net code on the server.

>> From what I have read on the subject, I suspect the problem is

that the web server

> is running under its own virtual desktop. If so can someone tell

me if what I am

> trying to do is even possible and if so how. The code I am using

is as follows:

> (I believe gr1.GetHdc() is where things start to fail).

>> System.Drawing.Image myImage = new Bitmap(1600, 1200);

> Graphics gr1 = Graphics.FromImage(myImage);
> IntPtr dc1 = gr1.GetHdc();
> IntPtr dc2 = GetWindowDC(GetDesktopWindow());
> BitBlt(dc1, 0, 0, 1600, 1200, dc2, 0, 0, 13369376);

>> Response.BufferOutput=true;

> Response.Clear();
> Response.ContentType="image/gif";
> myImage.Save(Response.OutputStream,

System.Drawing.Imaging.ImageFormat.Gif);

> Response.End();

>> Thanks,
>> Terry

>

Nov 18 '05 #5

Bruno Sirianni

I have a service (look like IIS) that can execute applicacation.
1 of this application is used for make graphics (Pie, etc...). The component
I use for render this must have the desktop because if not graph is blank!
I have set interact with desktop property of my service and there is not
problem!

When Application run I can see this!!!!

Brun!
"TerryWilson" <an*******@discussions.microsoft.com> wrote in message
news:F9**********************************@microsof t.com...

OK, I tried spawning a simple application that simply grabs the
desktop and writes the image out to a file. If I run the application directly, it works as expected, however, when I spawn it from my aspx page
on the server I simply get a blank image written out to the file.

I still think the key (as I read in another post in this group) is that the web server is running as a service in some virtual desktop that is different from the visible desktop. So how do you get the window handle to the
currently visible desktop???

Terry

----- Bruno Sirianni wrote: -----

I have tryed yuor code and read MSDN documentation.

gr1.GetHdc() return the device context for a Windows GDI-based structure. ASP.NET is not in a windows form!!

You can try making a simple form application that do this.
You can run this exe and then get the image...

Brun

"Te*********@tech.com" <an*******@discussions.microsoft.com> wrote in
message news:CE**********************************@microsof t.com...

> I am not sure what you mean by "the server is logged off". In this case, > our product will be running on the server at the time I wish to do the

screen

> capture, so it will have been logged onto by someone.

>> I did try checking "Allow Interact with desktop flag" for the WWW

Publishing

> service but that didn't seem to help ... is there another service I

should also

> be checking that flag for?

>> Terry
>> ----- Bruno Sirianni wrote: -----
>> I think that you can't get a printscreen on server because the server

is

> logged off.
> You can try changing IIS service property. You can try to

check Allow > Interact with desktop flag.

>> Brun
>> "Te*********@tech.com" <an*******@discussions.microsoft.com>

wrote in > message news:07**********************************@microsof t.com... >> I am developing a web based service tool using asp.net that we

will > distribute with

>> our product. This service tool will be used for remotely

configuring the

> product, problem

>> determination, etc. One thing that I would like to be able to do

is

> display a screen

>> capture of our product running. I have the code to get the screen

capture

> of the

>> desktop and I also know how to send the image back to the client

to be

> displayed.

>> The problem is that the code to grab the desktop image doesn't

work when

> running

>> in my asp.net code on the server.
>>> From what I have read on the subject, I suspect the problem is

that the

> web server

>> is running under its own virtual desktop. If so can someone tell

me if

> what I am

>> trying to do is even possible and if so how. The code I am using

is as

> follows:

>> (I believe gr1.GetHdc() is where things start to fail).
>>> System.Drawing.Image myImage = new Bitmap(1600, 1200);
>> Graphics gr1 = Graphics.FromImage(myImage);
>> IntPtr dc1 = gr1.GetHdc();
>> IntPtr dc2 = GetWindowDC(GetDesktopWindow());
>> BitBlt(dc1, 0, 0, 1600, 1200, dc2, 0, 0, 13369376);
>>> Response.BufferOutput=true;
>> Response.Clear();
>> Response.ContentType="image/gif";
>> myImage.Save(Response.OutputStream,

> System.Drawing.Imaging.ImageFormat.Gif);

>> Response.End();
>>> Thanks,
>>> Terry
>>

Nov 18 '05 #6