Re: Cast an Array to a Treenode Array - C# Discussion Boards

Craig James10-Dec-02 4:37

10-Dec-02 4:37

Hi all,

I have created a Web Service that accesses an MS Access database that is located on another computer. My problem comes when I try to use IIS 'Integrated Windows authentication'.

When I access the web service locally ie "http://localhost/webservice/webservice.asmx" I get access to the web service and when I call a web method it can access the database fine.

However, when I access the web service with "http://xxx.xxx.xxx.xxx/webservice/webservice.asmx" correctly I get the Windows authentication dialog popup and have to enter a valid user id, password, and domain to get access to the web service. But when I attempt to invoke a web method I get an error on trying to connect to the database with the following message:

Microsoft JET Database Engine The Microsoft Jet database engine cannot open the file '\\xxx.xxx.xxx.xxx\directory\DB\DB1.mdb'. It is already opened exclusively by another user, or you need permission to view its data.

The problem is not that someone else is opening the DB but I believe under the windows authentication I am not getting the privelage to access the network.

Any ideas??? Confused | :confused:

Re: Web Service authentication issue

OBRon11-Dec-02 9:58

OBRon

11-Dec-02 9:58

In IIS, your virtual directory is probably logging on as IUSR_MACHINENAME. This account has very little access to your computer. In explorer, go give the IUSR_MACHINENAME account full rights to the directory that the database is located in and I believe your problem will be solved.

OwnderDraw ComboBox

mikasa10-Dec-02 3:27

mikasa

10-Dec-02 3:27

Ok, how can I tell the ComboBox to display the Horizontal Scrollbar in the Drop-Down List if the Items extend past the DropDownWidth of the ComboBox? Since I am custom drawing the Items, it doesn't know that the Item Bounds extend past the DropDownWidth.

Cast an Array to a Treenode Array

Paul Watson10-Dec-02 1:15

Paul Watson

10-Dec-02 1:15

Maybe I have this all wrong, but here goes anyway.

I have two methods, both of which return a plain Array. The Array is one-dimensional and contains strings.

The one method I convert to an object array and that then makes adding it to the ComboBox really simple (just use AddRange.)

The other method though I want to convert to a Treenode Array and then use the AddRange of the treeview control. However I continually get casting errors when trying to cast from Array to Treenode.

So, wise ones, is there a simple way to do it? Or do I have to do a blasted for loop?

Paul Watson
Bluegrass
Cape Town, South Africa

Christopher Duncan wrote:
Which explains why when Santa asked, "And what do you want for Christmas, little boy?" I said, "A life." (Accesories sold separately)

Re: Cast an Array to a Treenode Array

James T. Johnson10-Dec-02 1:28

James T. Johnson

10-Dec-02 1:28

Paul Watson wrote:
The one method I convert to an object array and that then makes adding it to the ComboBox really simple (just use AddRange.)

The ComboBox works by calling ToString() on the objects in the Items collection to get the string it should display (by default, this behavior can be changed by setting the DisplayMember property).

Because the ComboBox works this way you can put add any type of object to the Items collection and it will work (it may not display the string you wanted, but it will at least be displayed).

The TreeView works by using a collection of specialized objects (TreeNode's), since it requires a specific type of object to be in its collection you'll have to convert your string objects to TreeNode objects. In this case it means creating a new TreeNode object and setting the Text property to the string for each string in the array (ie use a blasted for loop; or foreach)

James

- out of order -

Re: Cast an Array to a Treenode Array

Paul Watson10-Dec-02 1:32

Paul Watson

10-Dec-02 1:32

James T. Johnson wrote:
The TreeView works by using a collection of specialized objects (TreeNode's), since it requires a specific type of object to be in its collection you'll have to convert your string objects to TreeNode objects. In this case it means creating a new TreeNode object and setting the Text property to the string for each string in the array (ie use a blasted for loop; or foreach)

Tis what I feared.

Being in overkill mode I think I will subclass the TreeView a bit and add in an overriden AddRange method which can handle just a simple array of string objects. I for one do not always need all the fancy properties of a TreeNode.

Thanks James T. Johnson Smile | :)

Paul Watson
Bluegrass
Cape Town, South Africa

Christopher Duncan wrote:
Which explains why when Santa asked, "And what do you want for Christmas, little boy?" I said, "A life." (Accesories sold separately)

Re: Cast an Array to a Treenode Array

leppie10-Dec-02 8:02

leppie

10-Dec-02 8:02

Paul Watson wrote:
Being in overkill mode I think I will subclass the TreeView a bit and add in an overriden AddRange method which can handle just a simple array of string objects. I for one do not always need all the fancy properties of a TreeNode.

I would just make a static funtion Smile | :)

static TreeNodeCollection MakeNodes(string[] names)
{
  TreeNodeCollection nodes = new TreeNodeCollection();
  foreach (string name in names)
  {
     nodes.Add(name);
  }
  return nodes;
}

static void AddNodes(TreeNode parent, string[] names)
{
  foreach (string name in names)
  {
    parent.Nodes.Add(name);
  }
}

Overriden...derived classes...why? Roll eyes | :rolleyes:

DBHelper - SQL Stored Procedure Wrapper & Typed DataSet Generator for .NET

Re: Cast an Array to a Treenode Array

Paul Watson10-Dec-02 20:39

Paul Watson

10-Dec-02 20:39

leppie wrote:
Overriden...derived classes...why?

I did mention I was in an overkill mood... Big Grin | :-D

Also this kind of thing is something I will probably want to use over and over, makes it easier and more consistent if I have a TreeView control I can just drag on that already has it built in.

Thanks for the code.

Paul Watson
Bluegrass
Cape Town, South Africa

Christopher Duncan wrote:
Which explains why when Santa asked, "And what do you want for Christmas, little boy?" I said, "A life." (Accesories sold separately)

Re: Cast an Array to a Treenode Array

Nick Parker10-Dec-02 4:14

Nick Parker

10-Dec-02 4:14

James T. Johnson wrote:
(ie use a blasted for loop; or foreach)

Were you upset James, your too funny sometimes. Laugh | :laugh:

Nick Parker

Not everything that can be counted counts, and not everything that counts can be counted. - Albert Einstein

Re: Cast an Array to a Treenode Array

James T. Johnson10-Dec-02 8:29

James T. Johnson

10-Dec-02 8:29

Nick Parker wrote:
Were you upset James

Nope, just repeating what Paul said Big Grin | :-D

James

- out of order -

OpenDialog

fredza9-Dec-02 21:36

fredza

9-Dec-02 21:36

Hello,

how to overide the OpenDialog or SaveDialog box, like in VisualStudio Net.
// Maybe drawn all the box ?

Thanks in advance

Control bar

fredza9-Dec-02 21:33

fredza

9-Dec-02 21:33

Hello,

How to draw one control bar (where is controlbox) ownerdraw ?

Thanks.

Re: Control bar

David Stone10-Dec-02 4:56

David Stone

10-Dec-02 4:56

You may want to check out Lutz Roeder's Command Bar[^] That's:

A)Really cool
B)A good example of owner-drawing, and
C)Made by the same guy who made Reflector. I'd also check out that tool if you're going to be doing any serious .NET development. It's way better than the VS.NET object browser.

I don't know whether it's just the light but I swear the database server gives me dirty looks everytime I wander past.
-Chris Maunder

Microsoft has reinvented the wheel, this time they made it round.
-Peterchen on VS.NET

Using C# dll in VB?

$iva9-Dec-02 20:20

$iva

9-Dec-02 20:20

Hi All

I have created a new c# dll and want to use that in VB6. When I add a reference to the dll in vb, it throws an error "Cant add reference to dll".

Any help Eek! | :eek:

$iva

Re: Using C# dll in VB?

Burt Harris9-Dec-02 21:47

Burt Harris

9-Dec-02 21:47

Take a look at the help topics under "Exposing .NET Framework Components to COM". I think that will cover what you need.

Burt Harris

Re: Using C# dll in VB?

Nick Parker10-Dec-02 4:20

Nick Parker

10-Dec-02 4:20

Burt Harris (msft) wrote:
Take a look at the help topics under "Exposing .NET Framework Components to COM".

MSDN Article link[^] Smile | :)

Nick Parker

Not everything that can be counted counts, and not everything that counts can be counted. - Albert Einstein

Re: Using C# dll in VB?

Rickard Andersson²⁰9-Dec-02 21:48

Rickard Andersson²⁰

9-Dec-02 21:48

You didn't create a DLL, you created an assembly. You cvan't use asseblies in VB6.

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Using C# dll in VB?

Kannan Kalyanaraman9-Dec-02 22:37

Kannan Kalyanaraman

9-Dec-02 22:37

Hi,

It is possible to use .net assemblies in VB6 using Interop.
You need to run regasm tool with /tlb or /codebase option, so that it creates a wrapper for the .net assemblies to be called from COM.

Alternately you can directly reference MSCorLib / MSCorRe from VB6 and create instances of framework components(like HashTable or any other class). I dont have the sample with me right now, but DonBox demonstrated this sometime back in TechEd.

regards
Kannan

Re: Using C# dll in VB?

Rickard Andersson²⁰9-Dec-02 23:08

Rickard Andersson²⁰

9-Dec-02 23:08

Ooh!
Cool!

But does the .NET redistributable have to be installed on my customers computer??

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Using C# dll in VB?

Kannan Kalyanaraman9-Dec-02 23:13

Kannan Kalyanaraman

9-Dec-02 23:13

Rickard Andersson wrote:
But does the .NET redistributable have to be installed on my customers computer??

Absolutely, its just a wrapper that is generated by the regasm dll, something like a proxy. The runtime kicks in once you start calling managed methods.

Cheers
Kannan Smile | :)

Re: Using C# dll in VB?

Rickard Andersson²⁰9-Dec-02 23:50

Rickard Andersson²⁰

9-Dec-02 23:50

Kannan Kalyanaraman wrote:
something like a proxy

<changed_subject>
Could you tell me where I could learn more about what a proxy is and how it works etc.?
I want to learn...
</changed_subject>

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Using C# dll in VB?

Kannan Kalyanaraman10-Dec-02 0:00

Kannan Kalyanaraman

10-Dec-02 0:00

Well, I'm no expert here, but I can't recollect any specific resources as to deal with proxy/stub (in COM world).
You can refer to Don Box's Essential COM or Inside COM / DCOM for a thorough treatment on the subject.
In simpler terms Proxy might refer to a piece of code which helps to communicate between the provider / consumer.
I hope I'm not confusing you too much.

Cheers
Kannan Smile | :)

Re: Using C# dll in VB?

Kannan Kalyanaraman9-Dec-02 22:44

Kannan Kalyanaraman

9-Dec-02 22:44

hi $iva,

You cannot add reference to the dll (assembly) you have created in .net 'cause its not a proper COM dll, if you have a closer look, you can see that .net assembly doesnt have any COM specific mechanism to locate the particular DLL (there is no entry in the registry pointing to the location of the dll or does the other application know how to create an instance).

So, to call .net assembly from VB6 you need to do couple of things.
Create public interfaces and implement those interfaces in a class. Only public methods are visible to COM.
Run regasm tools against this assembly to make sure that other COM aware clients know how to create this COMponent and call those methods.
Refer msdn on Regasm and COM Interop.

Hope this helps.
Cheers
Kannan

Question on SocketOptionName.ReceiveTimeout

yccheok9-Dec-02 17:50

yccheok

9-Dec-02 17:50

i obtain a socket through TcpListener using:
Socket mySocket = myListener.AcceptSocket() ;//myListener is TcpListener

sometimes, i realize that my program will halt at line:
int i = mySocket.Receive(bReceive,bReceive.Length,0) ;

hence, i was thinking to set a receive timeout option, my questions is
(1)is this the correct method
mySocket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.ReceiveTimeout, 1000)

i put SocketOptionLevel as SocketOptionLevel.Tcp, is it correct?

(2)what will happen when the program come to line
int i = mySocket.Receive(bReceive,bReceive.Length,0) ;

and after 1000 miliseconds and still have not received anything. where will the program execution go?

thank you.

regards
yccheok

Re: Question on SocketOptionName.ReceiveTimeout

grv57513-Dec-02 4:07

grv575

13-Dec-02 4:07

1) I'm using
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 60000);
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 60000);
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveBuffer, 1024);
socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, 1);

So I think it should be SocketOptionLevel.Socket. Found it elsewhere on google.

2) Set a breakpoint on that line and trace over it. It will either fire an exception or go to the next line. Don't quite remember. Check the return values for receive as well.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.