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 5 2260
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
You will probably find more expert at this newsgroup
microsoft.public.dotnet.framework.drawing
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
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 >
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 >> This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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