TS-Teleport: Sample Instructions

Dynamic Virtual Channels

Terminal Services Team Blog — Thu, 20 Sep 2007 20:02:50 GMT

An important goal of the Terminal Services (TS) team is to provide a product that can easily be extended

re: TS-Teleport: Sample Instructions

anita — Mon, 24 Sep 2007 12:19:26 GMT

thanks for this excellent article.

re: TS-Teleport: Sample Instructions

amit — Tue, 25 Sep 2007 12:47:26 GMT

can u give some explanation on TS DVC example.

re: TS-Teleport: Sample Instructions

Ravi — Tue, 25 Sep 2007 13:08:24 GMT

how do we add shellextn key values. We are getting WTSVirtualChannelOpenex() failed error NO. 80070002. Are there any security settings to be done. Please reply ASAP.

Thanks

Ravi

re: TS-Teleport: Sample Instructions

Ahmed — Tue, 25 Sep 2007 22:53:19 GMT

Ravi,

Please follow the instructions in the main post to register the DVC plugin with the client. 0x80070002 is 'file not found' so I'm pretty sure the DVC client plugin is not loaded properly or doesn't create the right listener.

re: TS-Teleport: Sample Instructions

Ravi — Wed, 26 Sep 2007 13:18:23 GMT

TsTelePlugin.dll is correctly registered on the client

Below are the trace staments in the debugger

[hr=0x80070057]WTSVirtualChannelOpenEx failed

[hr=0x80070057]GetVirtualChannelHandle failed

[hr=0x80070057]TeleportFiles failed

CallStack which is failing

02b8eeb0 759a38dc 00000008 759a394c 02b8f040 WINSTA+0x1556

02b8eed0 74d63b94 00000000 ffffffff 6e61ede8 WINSTA!WinStationVirtualOpenEx+0x1b

02b8eef4 74d63f67 00000000 ffffffff 6e61ede8 WTSAPI32!WTSEnumerateProcessesA+0x1ec

02b8ef0c 6e602dc6 ffffffff 6e61ede8 00000000 WTSAPI32!WTSVirtualChannelOpenEx+0x15

02b8f040 6e601d14 02c83328 8cefc753 02b8f2b0 TsTeleport!DllGetClassObject+0xec28

02b8f19c 6e601584 02b8f28c 02b8f2b4 02b8f4e4 TsTeleport!DllGetClassObject+0xdb76

02b8f2b0 75b65bbf 02c83320 0294bbdc 00000009 TsTeleport!DllGetClassObject+0xd3e6

Above mentioned is the stack trace. Any clue are we missing any security settings on server side.

File version of wtsapi32.dll is

6.0.6001.16526. I suppose this is the correct RDP we are using

re: TS-Teleport: Sample Instructions

Sabry — Wed, 26 Sep 2007 15:19:23 GMT

For Ts-teleport to work fine, do we need to have Remote Desktop Connection 6.1 or using Remote Desktop Connection 6.0 will be sufficient? Please reply.

I am unable to find Remote Desktop Connection 6.1 download site,please help me in this regard also.

Thanks,

Sabry

re: TS-Teleport: Sample Instructions

ahmedt — Wed, 26 Sep 2007 21:47:32 GMT

The error 0x80070057 indicates an incorrect parameter. Most probably you are not running this on Vista SP1 or a Windows Server 2008. If you are then maybe not on a recent enough build although I doubt it.

- Ahmed [MS]

re: TS-Teleport: Sample Instructions

ahmedt — Thu, 27 Sep 2007 04:56:33 GMT

It appears that my post from the morning didn't go through; so sorry Sabry.

YES, you need the 6.1 client, which I believe isn't available as a stand-alone from MS. It's the client that ships with Vista SP1 and Windows Server 2008. You can download pre-release versions of those OS'es from the MS website.

- Ahmed [MS]

re: TS-Teleport: Sample Instructions

Sabry — Fri, 28 Sep 2007 15:00:01 GMT

The application is working fine on using Remote Desktop Connection 6.1,thanks for the guidance.

Regards,

Sabry

re: TS-Teleport: Sample Instructions

Tim — Fri, 14 Dec 2007 19:40:27 GMT

I'm really interested in this mechanism and I've tried to compile it up.

I am using Visual Studio 2008 on top of Vista and I get the errors below. I've added in the 2008 SDK (on top of VS2008) and added in the paths as detailed above, but still no differrence.

tsclientplgn.h(127) : error C2065: 'IWTSListener' : undeclared identifier

tsclientplgn.h(27) : error C2512: 'ATL::CComPtr' : no appropriate default constructor available

tsclientplgn.cpp(50) : error C2664: 'IWTSVirtualChannelManager::CreateListener' : cannot convert parameter 4 from 'T **' to 'IUnknown **'

Any pointers would be welcome.

re: TS-Teleport: Sample Instructions

Ryan Hilliker — Sat, 15 Dec 2007 01:25:47 GMT

Can this be done with VS2005 between Windows XP Client and Windows Server 2003 Terminal Server?

re: TS-Teleport: Sample Instructions

ahmedt — Wed, 09 Jan 2008 04:39:35 GMT

As described in the requirements above the client has to be 6.1 which *can run* on XP but the server has to be WS08.

- Ahmed.

re: TS-Teleport: Sample Instructions

Mohammed — Mon, 25 Feb 2008 15:59:13 GMT

The link of the Sample code is not working, Can any body reactivate it, or send it on

mohd1024@yahoo.com

I need it badly and would be very gratefull

Unable to register the COM object

Mohammed — Wed, 14 May 2008 15:06:16 GMT

When I tried to register the COM Object, I get the following error :

//////////////////////////////////////////

Debug Error!

Program: c:\WINDEOS\system32\regsvr32.exe

R6034

An application has made an attempt to load the C runtime library without using a manifest.

This is an unsupported way to load Visual C++ DLLs. You need to modify your application to build with a manifest.

For more information, see the "Visual C++ Libraries as Shared Side-by-Side Assemblies" topic in the product decumentation.

//////////////////////////////////////////

Unable to register the COM object

Mohammed — Wed, 14 May 2008 15:07:23 GMT

When I tried to register the COM Object, I get the following error :

//////////////////////////////////////////

Debug Error!

Program: c:\WINDEOS\system32\regsvr32.exe

R6034

An application has made an attempt to load the C runtime library without using a manifest.

This is an unsupported way to load Visual C++ DLLs. You need to modify your application to build with a manifest.

For more information, see the "Visual C++ Libraries as Shared Side-by-Side Assemblies" topic in the product decumentation.

//////////////////////////////////////////

Given that I put the following files with the output dll file :

Microsoft.VC90.DebugCRT.manifest

msvcm90d.dll

msvcp90d.dll

msvcr90d.dll

Static Virtual Channel on RDP 6.1

Mohammed N. — Wed, 09 Jul 2008 13:25:28 GMT

Is there a way to load the Static Virtual Channels by RDP 6.1 I mean on windows Vista or Server 2008.

Since the "WTSVirtualChannelOpenEx" can be used only on Windows 2008 then we have to develop two versions of the server side, one for Win 2008 that accepts both the dynamic and static channels and the other version for windows 2003 that accepts only the static channels.

I'd like to find a way to develop a server application that can work on both 2008 and 2003 and accept sessions from any windows version (vista, XP, ...).

Regards

re: TS-Teleport: Sample Instructions

Eric Holk [MSFT] — Wed, 09 Jul 2008 20:37:27 GMT

Mohammed N,

Assuming you are only using static channels, WTSVirtualChannelOpen still works on Windows Server 2008 the same as it did in previous versions. You don't have to use WTSVirtualChannelOpenEx unless you need dynamic channels.

If you want to you WTSVirtualChannelOpenEx, you can use GetProcAddress to see if the function exists. If it does, you can use it, otherwise you can fall back on WTSVirtualChannelOpen. This will let you keep one version of your server code, which uses the newer APIs if they are present.

-Eric

re: TS-Teleport: Sample Instructions

mohd1024 — Thu, 10 Jul 2008 10:41:41 GMT

Thanks Eric for replying.

In fact I'd like to continue using only static channels, but the problem I faced that Static Virtual Channels can't be integrated with RDP 6.1 running on Windows Vista or 2008. Am I right?

As you may know, the Static Virtual Channels were registered to the RDC by adding a registry key in

HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Default\AddIns

This is working fine on Windows XP, 2003. But when I try to do this for Windows Vista or 2008 to load the same SVC, the RDC will not connect to the server! is there another way to register the SVC?

If I find a way to do that I will continue to use the same SVC and "WTSVirtualChannelOpen", which is better for me.

Please, I am waiting your reply

re: TS-Teleport: Sample Instructions

Eric Holk [MSFT] — Thu, 10 Jul 2008 23:46:00 GMT

Hi again, Mohammed. We have not changed the way static virtual channel plugins are registered in Windows Vista or Windows Server 2008. The way you are describing should work. Is it possible that your plugin is returning some error that it doesn't return on earlier versions of Windows?

I'd suggest trying to run RDC under a debugger, and see if you can find anything interesting in your code that way.

-Eric

re: TS-Teleport: Sample Instructions

Eric Holk [MSFT] — Thu, 10 Jul 2008 23:46:03 GMT

I'd suggest trying to run RDC under a debugger, and see if you can find anything interesting in your code that way.

-Eric

re: TS-Teleport: Sample Instructions

Mohammed N. — Sun, 13 Jul 2008 14:47:01 GMT

Thanks agian Eric for replying and for this information.

I added a key into the key "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Default\AddIns" for my virtual channel and added the value:

Name REG_SZ [Virtual Channel DLL path]

in you sample code, you are registering the COM object first by regsvr32 and then adding the class ID in the "Name" value, while I am adding the dll file path directly, Is that make any difference?

I tried to debug the RDC, and yes it entered the dll entry point which is:

extern _declspec(dllexport) BOOL _cdecl VirtualChannelEntry(PCHANNEL_ENTRY_POINTS pEntryPoints)

and it executes all this function correctly, the API "VirtualChannelInit" was also executed successfully and returned "CHANNEL_RC_OK", and the entry point returned TRUE as expected, now it should go to the "VirtualChannelInitEventProc" callback function to handl the Initialization Event, but instead it breaks giving me the following error:

"Unhandled exception at 0x6c51584d in mstsc.exe: 0xC0000005: Access violation writing location 0x5ed88c89"

Iam trying to get extra info about this error cause.

Can you redirect me to a code that is definitly working on Win Server 2008 to compare with? or can I send you my code?

Thank you very much

re: TS-Teleport: Sample Instructions

mohd1024 — Sun, 13 Jul 2008 17:14:42 GMT

Thanks Eric Very Much, The Problem has been Solved. I really appreciate your help. It is now working on Win Vista and 2008.

As you may have figured out from my previous post, the problem was in the Virtual Channel Entry Point definition:

extern _declspec(dllexport) BOOL _cdecl VirtualChannelEntry(PCHANNEL_ENTRY_POINTS pEntryPoints)

I was using _cdecl where it should be _stdcall I am now using:

BOOL VCAPITYPE VirtualChannelEntry(PCHANNEL_ENTRY_POINTS pEntryPoints)

Which is working fine, it was working on Win2003 and XP even that it is _cdecl, but in 2008 and Vista it should be _stdcall

Thank you Eric again

re: TS-Teleport: Sample Instructions

Eric Holk [MSFT] — Mon, 14 Jul 2008 23:48:02 GMT

Mohammed, I'm glad to hear everything is working well for you now.

Good luck,

-Eric

re: TS-Teleport: Sample Instructions

Edward — Tue, 29 Jul 2008 05:54:32 GMT

Hi Eric,

I met a problem when I run it, WTSVirtualChannelOpenex() failed, I think I have the same problem with Ravi, can you tell me how to operate it correctly? how to establish TS connection in client side?

re: TS-Teleport: Sample Instructions

bjtm — Tue, 19 Aug 2008 16:41:42 GMT

I can register the 32-bit client and server dlls (on both XP SP3 and 2008 x64) successfully, however the TS 'ignores' the presence of the .tsteleport file in the user's SendTo directory, only presenting all other items in the directory through the context menu.

The TS is Windows 2008 x64, will registering the 32-bit dll be a problem here or can it run successfully under WoW?

static virtual channel & RDP 6.1 client

Kalle — Tue, 14 Oct 2008 20:33:22 GMT

We have a problem using RDP 6.1 Client with static virtual channels.

I our case everthing is working fine with the RDP 5.X client, but with RDP 6.1 (shipped with XP SP3) client, the static virtual channel doesn't work anymore.

As you saíd before, the RDP 6.1 Client should still support static virtual channels. Are there any known problems?