asked on Enabling Winform Control in ASP.NET
I have been attempting to incorporate access to our AS400 server via terminal through the intranet. http://aspnet.4guysfromrolla.com/articles/052604-1.aspx shows how to use a Winform user control in a webform page. I have a terminal winform control which works in a winform app. When I try following the instructions on the above site, however, I end up with a blank item on the page. I am including the ASPX file as well as the terminal code. I am sure that it is something simple I've missed if it could be pointed out that would be great.
Thanks
(the winform control is an uploaded file)
Thanks
(the winform control is an uploaded file)
//ASP.NET PAGE
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<object id="Object1" height="600" width="600" classid="bin/TerminalControl.dll#TerminalControl.TerminalEmulator" viewastext>
<param name="Rows" value="37" />
<param name="Columns" value="127" />
<param name="Hostname" value="192.168.100.212" />
</object>
</form>
</body>
</html>
.NET ProgrammingWeb ApplicationsASP.NET
Last Comment
Geoff Sutton
Oh, one other thing, are you running this in IE? I don't think it will work in any other browser.
Also, not sure if this is just coincidence or not, but every example I can find says to put the dll in the "root" directory of the website, not the bin folder.
ASKER
Yes, I have tried it in the Root as well as in Bin. I have seen a few examples of the DLL being in the BIN, the ClassID attribute being the path (relative, I believe) to the DLL. It is a windows user control, and I have also tried the code inheriting simple from controls, same effect. I am starting to wonder if the problem lies in hte complexity of the control, since it is a complete terminal emulator, but it does work perfectly in a winform. I will be back at this tomorrow, and I plan on starting with a simpler control to elminate the complexity as a factor (although thinking about it I don't believe it is).
Thanks for responding, and I will double check the items you mentioned.
Geoff
Thanks for responding, and I will double check the items you mentioned.
Geoff
Using VS 2008, I followed the example to the letter on that link you provided, and I can't get it to work. I just get a placeholder box. I can however unzip the project that is available for download, which was made in VS 2003 with .NET 1.1, and it works.
So for a test, just recreate the project on that page, a WinForms.dll, with a treeview control on it, and display that on a normal html or aspx page.
So for a test, just recreate the project on that page, a WinForms.dll, with a treeview control on it, and display that on a normal html or aspx page.
ASKER
I am using 2k8 also. I will try recreating what is there then build up from that. The Placeholder box is what I am getting also. Thanks. I'm glad I'm not the only one :)
Geoff
Geoff
ASKER
I copied the Zip to my system and upgraded to .net 3.5. Same problem. Did you run yours in 2003 or did you use 2008? I am wondering if this is something which has been phased out with the latest .Net?
Geoff
Geoff
I used 2k8, but I updated it to 2.0 and it worked, I didn't try updating it to 3.5
ASKER
Ok. I will try it again at 2.0 see if I can get it to work. Thanks.
ASKER
I can make the sample from the page work, but when I copy my code into that page it gives me a spaceholder, same as an img tag gives if the image can't be found. When I use the exact same DLL in a winform it works flawlessly. Do you know of any reasons WHY a control cannot be instantiated on a webpage?
Thanks for the help on this,
Geoff
Thanks for the help on this,
Geoff
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Particularly #5
ASKER
This is awesome. Thanks.
Geoff
Geoff
ASKER
I think I found my problem:
" The next area is the WndProc virtual function on the Control class. This function cannot be overridden by partially trusted code because this method can potentially be used to manipulate sensitive information in the form of window messages"
I am overriding WndProc to capture keystrokes on the form. Since this will be deployed as a web interface the code will only be partially trusted. Hence what I want to do cannot be done.
Thanks for finding this for me. I will find another workaround I suppose.
Geoff
" The next area is the WndProc virtual function on the Control class. This function cannot be overridden by partially trusted code because this method can potentially be used to manipulate sensitive information in the form of window messages"
I am overriding WndProc to capture keystrokes on the form. Since this will be deployed as a web interface the code will only be partially trusted. Hence what I want to do cannot be done.
Thanks for finding this for me. I will find another workaround I suppose.
Geoff
Have you thought about making it into an activeX control?
ASKER
I have but am shying away from that. I know nothing about developing ActiveX through .Net. Also my plan was to ultimately include this as a control on a webportal, so I am not sure how that would work out. What I think I will have to do is rewrite everything as a web control, or even a service, and use javascript to capture and send the keystrokes to the service, then intercept the return and post that back onto the page into a textarea or something similar. Maybe even create a div element where I can capture keystrokes and update the data in the div according to the key pressed. Basically this is going to require a complete rethink of the project, which is what I was really hoping to avoid :)
Thanks for the help,
Geoff
Thanks for the help,
Geoff
Is the TerminalControl a UserControl and not a Form?