CNetworkTreeCtrl

Sample Image - sample.gif

This is just an example of a content provider class (see the article CWaitingTreeCtrl), which overrides the PopulateItem virtual function to show network resources only when the user wants to access them.

You may specify the network resource to be used as the root of the tree control, as well as what kind of resources to be shown in the last level. You may also get specific information about the network resource associated with an existing item. To communicate with the class you can use the standard NETRESOURCE structure and related flags.

User interface features are those offered by the base class and can be further personalized with custom animations.

Class Reference

CNetworkTreeCtrl::RefreshNetworkRoot

BOOL RefreshNetworkRoot(LPNETRESOURCE pRoot, DWORD dwStopAtDisplayType =
                                                  RESOURCEDISPLAYTYPE_GENERIC)

It associates a network resource with the root item and refreshes the tree items in the first level. It also sets what kind of container resources must not be further enumerated.

The first argument pRoot is the address of the network resource you want as the root of the tree control. A value of NULL means the network root.

The dwStopAtDisplayType argument could take the same values as the dwDisplayType field of the NETRESOURCE structure. It specifies the last level of network resources that will be visible in the tree control.

The return value is TRUE if you specified a valid resource, FALSE otherwise.

CNetworkTreeCtrl::GetItemResource

BOOL GetItemResource(HTREEITEM hItem, LPNETRESOURCE pNr)

It retrieves the network resource associated to the specified item. If successful, the return value is TRUE and the structure pointed by pNr contains valid data, otherwise the return value is FALSE.

Updates

[ Today ]

Initial public release.

Conclusion

Please note that this class is not fully functional. So far, it can be used only in a dialog, but I will work on it when I have more time. I released this version to provide an example of a content provider for my CWaitingTreeCtrl class (see the article).

Any help or suggestion would be greatly appreciated. I plan to use this control in a new version of our NetSend utility, see this. Also, the latest beta releases of this class could be found here, for test only purpose.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

Paolo Messina

Software Developer
RoboTech srl

Italy

Member

Paolo began programming at the age of 9 with a glorious 8086 and GW-BASIC, then he played a bit with C, ASM and Pascal. He tought himself MFC and Windows programming, to exploit his studies of C++. Always attracted by low-level programming and Assembly, he's beginning to appreciate the joys of templates and STL. At work he changed his mind about Java, discovered Eclipse IDE, and now think it's cool.

He lives in Follonica, Italy.

He has been abroad in the U.S. to work on his final thesis before graduating. For seven months he was playing with airplanes and automatic control at the Unversity of Illinois at Urbana-Champaign.

He graduated in Computer Science Engineering at the University of Pisa, Italy, in December 2003.

Currently working for an edutainment robotics company (www.robotechsrl.com).

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Multi Select Implemented

Arun Yodyana

10:02 9 Jun '06

It's very nice for network resource browsing,I would like you to show Multi select implemented on that. Arun
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Network event

Fred_123

0:19 31 Aug '04

Hi, Do you know the sent event when network is shutdowned or modified (to actualize automaticaly your control)? Thanks!
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Re: Network event

Paolo Messina

1:06 31 Aug '04

A quick search on MSDN revealed:
http://msdn.microsoft.com/library/en-us/iphlp/iphlp/notifyaddrchange.asp[^]
(for Win2k/XP only, uses IP Helper API)

You may also try to see if you can get notifications trough the WM_DEVICECHANGE message. You may need to register your application and/or enable the device to send notifications in some way. For reference, see:
http://msdn.microsoft.com/library/en-us/bluetooth/bluetooth/bluetooth_and_wm_devicechange_messages.asp[^]
http://msdn.microsoft.com/library/en-us/devio/base/registerdevicenotification.asp[^]
http://msdn.microsoft.com/library/en-us/devio/base/registering_for_device_notification.asp[^]
http://msdn.microsoft.com/library/en-us/devio/base/using_device_management.asp[^]

I don't know if you can get notifications from the network adapters this way (GUID_DEVCLASS_NET is defined in "devguid.h"), but you may give it a try, maybe you can get network media status (connection/disconnection) notifications. Anyway, it's just an idea...

Paolo

------
Why spend 2 minutes doing it by hand when you can spend all night plus most of the following day writing a system to do it for you? - (Chris Maunder)

c++

ziamustafa

10:12 18 Jul '03


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Excuse Me

FoolBear

22:53 3 Jan '03

Excuse me! Could you please tell me how to serialize all the data from a treectrl and populate the tree with the data that serialized in a dialog based application?
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Re: Excuse Me

Paolo Messina

0:35 4 Jan '03

Sorry, but try asking in the Visual C++ forum (see Message Boards link). Paolo ------ "airplane is cool, but space shuttle is even better" (J. Kaczorowski)
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Re: Excuse Me

Anonymous

21:36 5 Jan '03

Thank you all the same!Best wishes!Happy new year! FoolBear
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Network resources

Theron

9:35 21 Jun '02

Hello,

I am a beginning programmer in the united states and was interested specifically in this portion of your code:

NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;

     NETRESOURCE nr;
     m_ctlNetwork.GetItemResource(pNMTreeView->itemNew.hItem, &nr);

     m_sProvider = nr.lpProvider;
     m_sRemoteName = nr.lpRemoteName;

which is in the selection changed   event.   I need to write a snippet which will BOOL if a particular network resource is available and so I want to access the nr.lpRemoteName as directly as possible.   Any idea how I can, without instantiating the tree, find a particular lpRemoteName?

Your code was very educational.   Thank you.   Especially the animations!

Theron

Re: Network resources

Paolo Messina

13:00 4 Aug '02

Hi Theron,

I tend not to reply to such old messages, because I know I am too late. Unfortunately anonymous posts don't get notified by email.

However I wanted to say thanks for the nice words, they're always appreciated!

If you still need an answer, which is unlikely, basically you need to do what I do in the class and call the networking API directly.

Best wishes,
Paolo

------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)

Animation problem

f0tisx

22:08 27 May '02

Although I have managed to implement the CNetworkTreeCtrl in a CView, I have trouble with the animation. Any help would be appreciated.
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Re: Animation problem

Paolo Messina

7:27 28 May '02

Happy to help out if I can... but what exactly is the problem? Paolo ------ "airplane is cool, but space shuttle is even better" (J. Kaczorowski)
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Re: Animation problem

f0tisx

20:05 28 May '02

I derived a control from CHourglassNetworkTreeCtrl and placed it in
a docking window. The problem with the animation was that I was
getting a NULL pointer in the m_hAniCur member of the CHourglassFX()
class. After replacing the LoadImage function I finally managed to get
it working. If you have any alternatives I'll be happy to hear it.

Another thing I've noticed is that SetAnimationDelay() dependes heavily
on the cursor frame jiffies.Am I wrong ?

Anyway, your work is work very good and I appreciate the quick response.

Another thing. I've seen that your code is free for non-commercial use.
What about modifications and commercial use.

Regards.

Re: Animation problem

Paolo Messina

22:33 28 May '02

I had problems too with animated icons in the past (see http://www.codeproject.com/treectrl/ProgressHourglassFX.asp).
One thing to check: if you used LoadIcon, the icon resource type should be RT_ANIICON, if using LoadCursor, it should be RT_ANICURSOR.
You can add such a resource in the VC++ resource editor, specifying a custom type ANIICON or ANICURSOR. The IDE will recognize those special types.

SetAnimationDelay() sets the delay between frames of the animation, so longer is the animation and longer is the time to complete a cycle.
Also, my CHourglassFX class uses constants for the animation that are suitable only for the provided animated hourglass. If you change the icon, you should also update the frame count, resource id, and so on...

Now the license. You can consider this work as under Artistic License as all my other articles (I didn't find the time to update this).

Cheers,
Paolo

------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)