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Curi0us_George wrote:
But for number 4, I believe E is the one that's false. How could you use reflection to find the types associated with a namespace?
You can enumerate all types in all assemblies and compare namespaces with the type you're searching for. The reflection classes don't have any methods that will get you types for a namespace, but it is possible.
And just because types aren't JIT'd until they're used doesn't mean reflection can't see them. It can get all the type information without actually loading and JIT'ing the type because it uses the metadata in the assembly.
Microsoft MVP, Visual C#
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How would you go about enumerating all assemblies? And if you're going to say that you can manually walk the path, I'd say you're no longer just doing reflection. At some point, you're tacking on too much functionality to legitimately call it a part of the feature set.
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Enumerating assemblies would be application-specific. You could enumerate all loaded assemblies (AppDomain.GetAssemblies ), load and enumerate all assemblies in a directory, etc.
To what degree you can call this reflection is a matter of opinion, though. You're still using reflection to gather this information and only simple collection storage and enumeration plus string comparisons to compare, but you wouldn't be there without reflection. More than any answer, I agree this is the wrong answer for that question but in my opinion they're all right. Too many times I've seen tests made up by people that really don't know the technology as well as they should before considering themselves an authority.
Microsoft MVP, Visual C#
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I can see how you might call this reflection, but I wouldn't. It's like loading all the classes in the java path and then using reflection to find out which classes belong to a specific package. It works, but it's not a built in capability, per se.
>> Too many times I've seen tests made up by people that really don't know the technology as well as they should before considering themselves an authority.
Definitely true.
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i've got a ijl15.dll so how can i import it into my c# project.
how to know which functions are there in ijl15.dll ? and how to use it ?
thanks...
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You can use the Dependency Walker (depends.exe, comes with the Platform SDK which is installed by default with Visual Studio) to see the functions exported from the native library.
Read Interoperating with Unmanaged Code[^] in the .NET Framework SDK.
If your library contains exported functions, you use the DllImportAttribute to declare them as externed methods for use in your classes. If it is a COM server, you import the typelib using tlbimp.exe (or VS.NET can do it if you add a reference to a COM library) and, optionally, ActiveX controls using aximp.exe (which VS.NET can also do if you add an ActiveX reference to your toolbar and drag it on your form).
Everything you need to know is in the first link above.
Microsoft MVP, Visual C#
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Is it possible to Dock your application to the System (Desktop). An very good example of such an application is "Magnifier" which comes bundled with Windows. Your application should behave like a Toolbar.
It should so happen that the application should always be active and all the other application open should not overlap your application.
Is it possible to do this ?
CHEERS
- NAGU
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I am developing a software where in I require to block the usage of Keyboard and Mouse and hence forth deny the usage of the system to the user.
With KeyEventArgs I can block the usage of certain individual characters. But since i want to deny access of the whole system to the user, I need to mask even the Keyboard events such as "Alt+Tab" or "Ctrl+Alt+Del" etc...
Any kind of help is appreciated.
CHEERS
- NAGU
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You can do this, or at least partially do this, utilizing Win32 keyboard and mouse hooks. Search the articles of this site, there's a few good ones covering Win32 hooks in .NET.
---------------------------
He who knows that enough is enough will always have enough.
-Lao Tsu
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If you want to disable everything except a key combination you want to unlock the keyboard and mouse, you'll have to write a low-level keyboard hook into your app. This will let you get keyboard messages system wide.
You might want to read this article on CP[^] for a little hooking in C# and follow the links in that article to some work by Dino Esposito on the subjet.
Also, search through the posts here in C# and VB.NET for some discussions on hooking the keyboard.
RageInTheMachine9532
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A simpler way is to add an IMessageFilter using Application.AddMessageFilter and doesn't require P/Invoking anything or using low-level hooks. It simply gives your implementation a chance to filter messages before they're dispatched to their target windows (controls).
Microsoft MVP, Visual C#
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Hmmm... Didn't know that. I'll look into that for future reference. Thanks Heath!
RageInTheMachine9532
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A much easier way and more efficient way (without having to P/Invoke native APIs) is to simply add a IMessageFilter to pre-filter any messages sent to ONLY your application (as opposed to using a system-wide, low-level keyboard hook).
using System;
using System.Drawing;
using System.Windows.Forms;
public class Test : Form, IMessageFilter
{
static void Main(string[] args)
{
Test t = new Test();
Application.AddMessageFilter(t);
Application.Run(t);
Application.RemoveMessageFilter(t);
}
public Test()
{
TextBox tb = new TextBox();
tb.Location = new Point(8, 8);
this.Controls.Add(tb);
tb = new TextBox();
tb.Location = new Point(8, 30);
this.Controls.Add(tb);
}
private const int WM_KEYDOWN = 0x0100;
private const int WM_LBUTTONDOWN = 0x0201;
private const int WM_RBUTTONDOWN = 0x0204;
private const int WM_XBUTTONDOWN = 0x020b;
public bool PreFilterMessage(ref Message m)
{
if (m.Msg == WM_KEYDOWN ||
m.Msg == WM_LBUTTONDOWN ||
m.Msg == WM_RBUTTONDOWN ||
m.Msg == WM_XBUTTONDOWN)
return true;
return false;
}
} Pay attention to the PreFilterMessage method, which is the implementation for IMessageFilter.PreFilterMessage . You could filter other application messages this way as well. Anything that goes through the application message pump can be filtered.
Microsoft MVP, Visual C#
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I really was informed by these information, Thank you Heath.
But how can one get the constant values for messages like WM_KEYDOWN...etc.
Medhat Ramses
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They are defined in the header files, take a look at windows.h for example.
- Nick Parker My Blog
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how do i put a scroll on a picture box or just how do i create a image where i can scroll
can somebody give me code examples
chad
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Place your PictureBox control onto another panel. Whenever you set the bitmap of the PictureBox control, set the size of the PictureBox control to be the size of the bitmap. A Windows scrollbar will appear allowing you to scroll.
Additionally, you can write your own control to do this, but that's probably a little more work.
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He who knows that enough is enough will always have enough.
-Lao Tsu
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I think it is not possible with the PictureBox. But you can do a workaround.
Add a panel which is small in size than the PictureBox and set the AutoScroll property of Panel to True.
And also make the PictureBox's SizeMode property to AutoSize so that it will be big enough to have the Image without any sterching and you can see the full image when you scroll the panel.
I think for doing this, there is no need for sample code. It is very straight forward.
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Wasn't entirely sure where to post this deployment question... sticking with the language the component was written in.
Is it possible to use the Application Updater Component with a Linux Apache server? I've set up a very basic test app but it is not working. No error messages and an empty log file. I know the app is connecting because I can see it in my firewall and webserver logs. I've verified that directory browsing is enabled, so I'm thinking that the problem could be that I'm not using IIS. I'd really prefer to not have to set up my own IIS server since I'm already paying another company to host a webpage for me and I'd like to just use a separate directory there. Any help would be appreciated!
-b
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It's been a while since I read the corresponding documentation for the AUC, but IIRC it only needs to get a manifest/version file that points to the update files, so what web server you use shouldn't matter. I'd say install IIS on your development machine (comes in handy many times anyway) and get it to work on that. Then move all the support files as-is to Apache, update the update URL in your .config file (or wherever it's stored), and try again.
Microsoft MVP, Visual C#
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Thanks for the response. Yeah, I guess having IIS setup would probably make life a bit easier for me anyway. I'll take that advice. Thanks again.
-b
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Hi, everyone
I don't have much knowledge about component or dll these kind of stuff. When I add a dll to my .Net project using add reference, some of them ok, some of them no. So what kind of dll or exe etc. can be added into .Net project by Add reference? And what's difference between the '.Net' tab and 'com' tab?
Thanks in advance.
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The .NET tab lists .NET Assemblies. When you click the Browse... button, you must pick a .NET assembly which uses the same extension. These contain a different PE/COFF header bit and different executable segments. If you want a shell extension that visual identifies .NET Assemblies (only .dlls, though, but those are all you can reference using VS.NET) by using an overlay icon, download and install my Shell Extensions for .NET Assemblies[^].
The COM tab lists COM controls (ActiveX controls) and COM typelibs (design-time discovery information, which VB6 and below uses as well). When you click the Browse... button, you must pick a DLL or OCX that contains COM information.
The Projects tab lists other projects in your solution. Use this when developing a multi-project solution to keep assembly references in sync with the current build configuration.
You should read some books on .NET development. These concepts are necessary to understand if you want to start writing anything other than "Hello, world" applications.
Microsoft MVP, Visual C#
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