Re: custom errors on the server - C# Discussion Boards

10-Jun-04 4:16

I have a .NET client app and a .NET console server app. Whenever the server throws an error, the exception information is as follows, regardless of the type of exception thrown: "The server encountered an internal error. For more information, turn on customErrors in the server's .config file"

Well, I'm currently not using a .config file for the server. Is there a way to turn on custom errors through code? RemotingConfiguration.CustomErrorsEnabled apparently has no effect, unless I'm using it wrong. Any ideas?

#include "witty_sig.h"

Heath Stewart10-Jun-04 7:08

10-Jun-04 7:08

Not using a Web.config file? Why not? You should. It's just a file named Web.config put into the web application's root directory (not necessarily the web server's root directory) with the following (for your needs):

<configuration>
  <system.web>
    <customErrors mode="On" />
  </system.web>
</configuration>

Otherwise, you can handle the HttpApplication.Error event and do whatever you want. Typically you implement this in an IHttpModule implementation, but you'd need a .config file to configure your ASP.NET application to use it! Smile | :)

You can also handle this in your Global.asax file (or its code-behind file) as well, but many times it's better to abstract your code by making it modular and/or service-oriented.

Seriously, though, you should use a Web.config file. You can configure runtime settings (not just for ASP.NET, but for all of .NET), security, impersonation, etc. etc.

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Judah Gabriel Himango10-Jun-04 8:32

10-Jun-04 8:32

I'm sorry I should've been more clear. The server application is not a web application. It's a standard .NET console application that talks to clients via .NET Remoting. Web.config applies only to web applications correct?

#include "witty_sig.h"

Heath Stewart10-Jun-04 9:56

10-Jun-04 9:56

Correct, but the error resolution message you're getting is typical of ASP.NET web applications, which is why I assumed you were using ASP.NET. What exactly, then, is returning you such an error?

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Judah Gabriel Himango10-Jun-04 10:09

10-Jun-04 10:09

An example would be when the client tells the server to perform some task and waits for return. While the server is performing some task, it will throw an exception. The client catches the exception, but doesn't tell me the exception type, message, stack trace, etc. and tells me to enable custom errors on the server if I want more information.

#include "witty_sig.h"

Heath Stewart10-Jun-04 10:14

10-Jun-04 10:14

What I mentioned before is close, but now that I understand your client/server app a little better, I can tell you that you need to configure pretty much the same thing, except instead of using <system.web> use <system.runtime.remoting> and set the mode attribute to "on" (lower-case "o", for some reason - not very consistent).

This .config file would be named the same as your client application + .config at the end. The RemotingConfiguration.CustomErrorsEnabled method is merely a way to determine if custom errors are displayed based on the locality of the remote call.

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Judah Gabriel Himango10-Jun-04 10:19

10-Jun-04 10:19

Thank you Heath I'll give that a whirl.

#include "witty_sig.h"

C LaMorticella27-Sep-04 8:31

C LaMorticella

27-Sep-04 8:31

Did this actually work? Could you post an example or emial it to me. I am having the same problem and I am not having any success getting it to work. Currently, I am also not using a config file.

C LaMorticella
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Form Maximize Events

BrianEllis10-Jun-04 4:07

BrianEllis

10-Jun-04 4:07

I have a form that is being maximized. The form is a child form of an MDI parent and there is another child form docked on the left as a menu. Therefore, when the form is maximized it needs to be maximized to (for instance Smile | :)

location 256, 0, 200, 200 instead of 0,0,456,200 (where above is x, y, width, height). I'm having a real issue finding an event that fires BEFORE a maximize command to set the bounds and the maximizedbounds property doesn't seem to be doing any good. Any ideas, events, etc.?

Brian

"In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move." - Douglas Adams

Re: Form Maximize Events

Heath Stewart10-Jun-04 7:04

Get instance that's calling the current method

10-Jun-04 7:04

Override WndProc and handle the WM_SIZING (0x0214) message. This is sent to a window procedure (and keep in mind that almost all Windows Forms controls encapsulate native controls and dialogs) before being resized. The Message.WParam specifies the edge that is being resized and the Message.LParam specifies the RECT (which you must define in managed code - a System.Drawing.Rectangle will not suffice because it stores coordinates differently).

Set the Message.Result to new IntPtr(1) to signal that you've processed it and don't want your Form to be resized.

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partyganger10-Jun-04 2:52

partyganger

10-Jun-04 2:52

Is it possible to get a reference to the object that is calling a method (maybe through something like Reflection)?

i.e. something like:

<br />
public class A<br />
{<br />
  private B b;<br />
<br />
  public A()<br />
  {<br />
    b.SomeMethod()<br />
  }<br />
}<br />
<br />
public class B<br />
{<br />
  public void SomeMethod()<br />
  {<br />
    if(callingInstance.Type == typeof(A)<br />
      //do domething<br />
  }<br />
}<br />

Re: Get instance that's calling the current method

Heath Stewart10-Jun-04 4:09

Check if software is installed

10-Jun-04 4:09

You can get the calling assembly using Assembly.GetCallingAssembly, but not the calling type. Since this is an object-oriented development platform, a more appropriate implementation would accept the caller as a parameter to the method, typically declared as an abstract class or an interface. The caller would have to implement that interface or extend that abstract base class and override whatever members are appropriate to call, so that your method or class can call those methods without knowing about a specific implementation of those methods.

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Peter Nirschl10-Jun-04 2:30

Peter Nirschl

10-Jun-04 2:30

Hello!
I want to check if a program is installed. For instance I want to see if the Visual C++ Toolkit 2003 is installed on my computer. How can I do this in C#?

Thank you for helping me! Smile | :)

Heath Stewart10-Jun-04 4:14

10-Jun-04 4:14

There's no complete way of doing this, other than enumerating the registry keys under HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall. You can use the System.Management classes to enumerate the Win32_Product CIMv2 class, but that only covers Windows Installer packages. Most of Microsoft's products, samples, etc. use Windows Installer (in fact, I haven't seen one in years besides the Managed DirectX runtime that doesn't - even the .NET Framework uses Windows Installer).

For more information and a great add-in for VS.NET 2002 and VS.NET 2003, read WMI and .NET: System.Management Lets You Take Advantage of WMI APIs within Managed Code -- MSDN Magazine, May 2002[^].

For links to the add-ins, see http://www.microsoft.com/downloads/results.aspx?productID=BF0EBDD7-5D74-479A-B01E-D7B141200243&freetext=WMI&DisplayLang=en[^].

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Wackatronic10-Jun-04 4:47

Wackatronic

10-Jun-04 4:47

Even after enumerating and possibly finsing the correct registry key, you should check for the exsistence of the dll or exe. Windows applications are infamous for not removing all registry entries after an un-install or even people will delete directories without using the un-install. Top and bottom is even if it has a registry key, don't assume that it's there.

Just expanding on what Heath mentioned.

Yes, I program in VB, but only to feed my addiction to a warm place to sleep and food to eat!

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Heath Stewart10-Jun-04 6:58

10-Jun-04 6:58

True to a point (although he didn't ask about files - merely products), but Windows Installer - unless you explicitly change the execution sequence from the default or change the Component table attributes or transitive condition to keep the component installed during uninstall - will remove all files it placed there originally. Windows Installer really is a powerful package distribution system, something I've been working with since it's 1.0 beta days and am currently beta testing for 3.0. If you're interested, you should take a look at the Windows Installer SDK on MSDN.

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Wackatronic10-Jun-04 7:57

Wackatronic

10-Jun-04 7:57

[original posting]I want to check if a program is installed. For instance I want to see if the Visual C++ Toolkit 2003 is installed on my computer. How can I do this in C#?

The point I'm refering to is that just because something has a registry entry, doesn't mean it exists, only that it was installed at some point in time. I know from experience not to take anything for granted if it has a registry entry.

Heath Stewart wrote:
(although he didn't ask about files - merely products),

He wants to see if a specific product is installed. I merely wanted to point out that an un-install may have failed or been un-installed incorrectly (like deleting directory - infamous in users Smile | :)

) and still have left registry entries that may be included in the enum.

Regards,
Eric C. Tomlinson

P.S. Haven't used Windows Installer yet, all the clients I work for have subjected me to Installshield Dead | X|

Maybe someday I'll be able to use it on something that I write (and actually finish) Poke tongue | ;-P

Yes, I program in VB, but only to feed my addiction to a warm place to sleep and food to eat!

Visit my Code Project blog (Mobile Audio project)[^]

Heath Stewart10-Jun-04 9:51

10-Jun-04 9:51

I know that non-Windows Installer products are notorious for this, but Window Installer packages are actually transacted - you won't see this behavior (except, perhaps, from poorly-written custom actions where the developer doesn't take rollbacks into account or simply can't).

It's Windows Installer I'm defending, not installs. Regarding installs in general, I wholy agree with you...except for one problem: proprietary installs are just that - proprietary. There may be no way to determine where to even look for a product if the install information (or, rather, the uninstall information) doesn't tell you. This is another reason why Windows Installer kicks butt: it's a relational database and tracks everything from files, registry entries, and feature and component installation states. Smile | :)

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Peter Nirschl11-Jun-04 22:23

Peter Nirschl

11-Jun-04 22:23

First I want to thank you all for your great help.
All I wanted to do is to check if the Visual C++ Toolkit 2003 is installed on a system. I give my programs only to users who uses the Uninstall packages. So there won't be problems with deleting program directories or something.

But there is only interesting thing:
When I open my Control Panel and double click "Software" (in German) or "Add Or Remove Programs" (something like that in English). However, I got a list with all currently installed programs. How is this?

Heath Stewart12-Jun-04 0:25