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I used an ActiveX Object in my VB6 project like this:
obj = CreateObject("AAA.BBB");
When I tried to do the same thing in C# .Net project, I can't not find this object in "Add reference" dialog.
Does anyone know why?
Thanks in advance!
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Choose Add Reference and find it through COM tab, then you can create it like this:
yourobject obj = bew yourobject();
Mazy
You're face to face,
With the man who sold the world - David Bowie
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When you add an assembly reference (an interop assembly is created automatically for COM libraries), you must know in which library the COM object is contained.
To generate an ActiveX wrapper (known as a Runtime Callable Wrapper, or RCW) for this specific object, right-click on the toolbox and select Customize (or similar). Click the COM tab and find the control you're looking for. This generates a wrapper, which you can then use the new operator to instantiate. The typelib for that ActiveX control is converted to an interop assembly and automatically added to your project references.
.NET isn't VB6 - far from it. It's a type-safe runtime that manages memory and provides code access security, among many other things.
For more information on COM interoperability in .NET, see Interoperating with Unmanaged Code[^] in the .NET Framework SDK on MSDN Online, specifically the section Exposing COM Components to the .NET Framework[^].
Microsoft MVP, Visual C#
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Thank you both very much, this is very helpful.
However I don't know which com dll I am using. Because this com dll is not provided for development purpose. It's registered by installing a specific software. I just happen to know this back door.
When I tried to find the same com in the COM tab in VS.Net, I can not find it. Then I went to my registry table, it didn't tell me which dll it's, it just showed like this under the CLSID folder: 'C:\program files\AAA\aaa.exe Automation'.
According to my understanding, VS.Net should be able to pick up the registered COM and show them in the COM tab.
Now I don't understand why in VB6 it is ok, but doesn't work in VS.Net. Is it because this COM doesn't register correctly?
Thanks in advance!
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That's a not a back door. Going into your registry and finding out which executable contains the component is what COM does anyway. That's how it works.
It appears that this COM component you want is actually an out-of-proc automation server. You should still have no problems using it, but you first need to use the write "COM tab", or just create it manually using tlbimp.exe. If you're looking to add a COM component, you need to use the toolbox customization dialog, not the project references dialog. That would be to add an entire typelib.
It would help if you knew where the typelib for this automation server is located. Sometimes they are embedded in the executable itself, and sometimes they are external files. You can easily use tlbimp.exe on that to create an interop assembly.
You should also read the links I gave you. Again, .NET is not VB6 and works a little differently under the covers when dealing with COM.
Microsoft MVP, Visual C#
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Thanks again! I work it out with your help. It's a late-binding COM.
However another thing is I found late-binding in VS.Net is a bit more complicated than in VB6.
In VB6:
if com_obj.State.Result = com_obj.SUCCESS<br />
then<br />
.....
But In C#.Net, I have to do this:
object success = t.InvokeMember("SUCCESS", <br />
BindingFlags.Public |BindingFlags.GetProperty | BindingFlags.GetField, <br />
null, com_obj, null);<br />
<br />
object state = t.InvokeMember("State", <br />
BindingFlags.Public |BindingFlags.GetProperty | BindingFlags.GetField, <br />
null, com_obj, null);<br />
object result = result.GetType().InvokeMember("Result", <br />
BindingFlags.Public |BindingFlags.GetProperty | BindingFlags.GetField, <br />
null, state, null);<br />
if ( state.Equals(success) )<br />
....
Is it there any more convenient way in VS.Net to do the same thing?
Thanks in advance!
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Because of the fundamental architecture of COM and .NET interoperability. The code you're doing is essentially what the VB virtual machine does in the background using the IDispatch implementation of automation classes (it finds the method by the DISPID and invokes it with the specified parameters).
You shouldn't have to do this, though. If you create your interop assembly correctly, you just use the classes and methods from that. That's what the interop assembly is for - wrapping the COM control in a runtime-callable wrapper (RCW).
Again, read that link about exposing COM components to the .NET Framework I posted before. It's important to truly understand and not just accept the first thing that works. If you keep doing what you're doing, it'll take you forever to finish! Do it right and create and use the interop assembly.
Microsoft MVP, Visual C#
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Hi,
I am working on an application which enumerates the shares from a remote computer and open it in explorer.
I have successfully got the names of the shares and now I am trying to open a directory lets say //station1/eBooks on the remote station1.
The behavior would be the same as typing //station1/eBooks on Run in Start Menu Or any other share scaner like shed. I have tried a new process for "explorer.exe" and passing the path as argument. It works fine for local shares but access denied instead of giving the login prompt for remote folders.
Anyone knows how to do it Plz reply. Thanks in advance.
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I think you should do something liek this:
file://username:password@your/path
but I am not shure
Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!
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That syntax is no longer supported after the URL moniker was patch to fix a bug.
Microsoft MVP, Visual C#
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Accessing the path via .NET does not prompt for credentials. This is a function of the shell. .NET is not the shell. If you want to prompt for credentials, catch the exception, prompt for their username and password, and then impersonate the user and try reconnecting. For more information on impersonating a set of credentials, see the class documentation fo the WindowsImpersonationContext in the .NET Framework SDK, which also includes an example.
Microsoft MVP, Visual C#
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Thanks for your reply.
Let me restate by problem. I enumerate the shares, user doulbe click on the share in the list view, the share is opened in the explorer (if password is required windows asks for it itself). Its the same behaviour like lan netscan or any other share scan software.
Plz take a look at shed. Its a realy small software but great speed. Download link is below.
http://keir.net/shed.html
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Sorry, I didn't quite understand you before. Take a look at System.Diagnostics.Process. You could invoke Windows Explorer on the share like so:
string path = "share path";
Process.Start("explorer.exe", string.Concat("/e,", path));You can find more about the Windows Explorer command line switches at http://support.microsoft.com/default.aspx?scid=kb;en-us;130510[^].
Microsoft MVP, Visual C#
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Alright, anyone knows how to put a ProgressBar as one of the panels in a StatusBar? 
<font=arial>Weiye Chen
When pursuing your dreams, don't forget to enjoy your life...
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Yes. First, make sure that StatusBar.ShowPanels is true, and add your panels. To make things easier, make your panel that will host the ProgressBar fixed-width (this is common in most apps beside).
Next, handle the StatusBar.DrawItem event. Your event handler should look something like the following (assume statusBar1 is your StatusBar, and progressBar1 is your ProgressBar):
private void statusBar1_DrawItem(object sender, StatusBarDrawItemEventArgs e)
{
Rectangle bounds = e.Bounds;
bounds.Y = statusBar1.Top + SystemInformation.Border3DSize.Height;
bounds.Height += SystemInformation.BorderSize.Height * 2;
bounds.X -= SystemInformation.BorderSize.Width;
if (statusBar1.SizingGrip && ((Form)statusBar1.Parent).WindowState ==
FormWindowState.Maximized)
bounds.Width += SystemInformation.VerificationScrollBarWidth;
progressBar1.Bounds = bounds;
}This works, though there might be more elegant solutions you could search for.
Microsoft MVP, Visual C#
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Heath Stewart wrote:
though there might be more elegant solutions you could search for.
If a shorter code means elegant, perhaps this is one.  Btw, thanks again.
private void statusBarBrowser_DrawItem(object sender, System.Windows.Forms.StatusBarDrawItemEventArgs sbdevent)
{
if(sbdevent.Panel == statusBarPanelProgress)
{
Rectangle rectPanel = sbdevent.Bounds;
rectPanel.Y += statusBarBrowser.Location.Y;
progressBarBrowser.Bounds = rectPanel;
}
}
<font=arial>Weiye Chen
When pursuing your dreams, don't forget to enjoy your life...
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The reason some of that code was there because the code you have above won't draw quite right in the bounds specified by the StatusBarPanel, especially if you need to take a sizing grip into account.
Microsoft MVP, Visual C#
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Heath Stewart wrote:
especially if you need to take a sizing grip into account.
I see... I have disabled the sizing grip. 
<font=arial>Weiye Chen
When pursuing your dreams, don't forget to enjoy your life...
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Hi..
i would like some pointers to links that can guide me on this task..
i want to create remote objects with callback functions and use them in the window host.
with due regards to Jibin Pan. I found a article at -->
http://www.c-sharpcorner.com/Code/2003/March/RemoteObjectsP1.asp
this is perfectly what i want ..but problem is when i try to register a callback method..I get some sort of security exception...can anybody tell me where i have gone wrong..
if we go to the link i mentioned ..we see there are some figs illustrated..On channel server fig ..i'm not able to send message from server to client..
Jibin Pan Sir,If u happen to read this posting..plz do not get angry..as i tried contacting you.
Regards
God is Great..
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Why don't you tell us what the SecurityException read? There's many reasons that can be thrown.
Microsoft MVP, Visual C#
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The exception i got is -->
System.Security.SecurityException.
Type System.DelegateSerializationHolder and the types derived from it (such as System.DelegateSerializationHolder) are not permitted to be deserialized at this security level.
God Is Great
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The solution to your problem is here Ingo Rammer[^]
Free your mind...
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Thanks a lot Guillermo  ...........
it worked..
WHew...it saved a couple of my hours..rather days ..;P )
God Bless u..;)
God Is Great
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Hi,
i've created an MDI app. there is main form which contains some buttons..and a register form which runs after any one of the buttons are clicked...the problem is when the register form shows itself as a child window the buttons from parent window come onto the child window and are overlapping the form.
whats wrong?...how do i handle this problem.
Arvinder Gill
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I think u can creat a panel and dock it a side first. Then put your buttons into it.
<font=arial>Weiye Chen
When pursuing your dreams, don't forget to enjoy your life...
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