Re: com local server - COM Discussion Boards

«_Superman_»10-Jun-10 19:13

10-Jun-10 19:13

Since removing and adding does not work for you, you could add the activex control into a new project and then take the generated files from there and replace your original files with the new ones.

«_Superman_»

I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: regenerate wrappers for ocx library

Stephen Hewitt10-Jun-10 19:45

Stephen Hewitt

10-Jun-10 19:45

Sounds like a reasonable suggestion.

Steve

Re: regenerate wrappers for ocx library

eusto10-Jun-10 21:14

eusto

10-Jun-10 21:14

Thanks for the suggestion. Do you guys have any idea why removing does not work? Do you know where visual studio keeps this info?

Thanks,
Eugen

Re: regenerate wrappers for ocx library

Stephen Hewitt11-Jun-10 18:46

Stephen Hewitt

11-Jun-10 18:46

I've ran into the same problem in the past. One of my co-workers told my a magic incantation that got the wrappers regenerated, but I can't remember what it was.

Steve

com local server

vasuvasanth7-Jun-10 23:06

vasuvasanth

7-Jun-10 23:06

Hi,
I have a com local server(an BitManipulater.exe server) and a client.I executed two instances of client programs in debug mode.If i open the task manager in windows xp, the processes tab is showing only one BitManipulater.exe process.How com deals with local server, if lot of client are using same local server.I thought there will be two instances of BitManipulater.exe.Any explanation on this please,

Thanks in advance
venkatanarayana

Re: com local server

Stephen Hewitt8-Jun-10 14:29

Stephen Hewitt

8-Jun-10 14:29

When calling CoRegisterClassObject[^] for your class object use the REGCLS_SINGLEUSE flag (see here[^]). This should result in a separate exe per instance.

Steve

Re: com local server

vasuvasanth8-Jun-10 21:40

vasuvasanth

8-Jun-10 21:40

Hi Steve,
Thanks for the info.I am using MFC for creating com server.How i can access CoRegisterClassObject,I think object factories registration is done in COleObjectFactory::RegisterAll

Thanks & Regards,
venkatanarayana

Re: com local server

Stephen Hewitt9-Jun-10 15:21

Stephen Hewitt

9-Jun-10 15:21

It's not hard to find out. I placed a breakpoint in CoRegisterClassObject and when it was hit had a look at the stack. The MFC function COleObjectFactory::Register seems to be where the action takes place. The code in question looks like this:

SCODE sc = ::CoRegisterClassObject(m_clsid, &m_xClassFactory,
			CLSCTX_LOCAL_SERVER,
			m_bMultiInstance ? REGCLS_SINGLEUSE : REGCLS_MULTIPLEUSE,
			&m_dwRegister);

Note the that the m_bMultiInstance member seems to be exactly what you're looking for. When I searched MFC's source for it I found this:

void COleTemplateServer::ConnectTemplate(
	REFCLSID clsid, CDocTemplate* pDocTemplate, BOOL bMultiInstance)

Which contains the following:

m_bMultiInstance = bMultiInstance;

This functions seems to be called from your application's InitInstance function:

CMultiDocTemplate* pDocTemplate;
pDocTemplate = new CMultiDocTemplate(
	IDR_MFCEXETYPE,
	RUNTIME_CLASS(CMFCExeComServerDoc),
	RUNTIME_CLASS(CChildFrame), // custom MDI child frame
	RUNTIME_CLASS(CMFCExeComServerView));
AddDocTemplate(pDocTemplate);

// Connect the COleTemplateServer to the document template.
//  The COleTemplateServer creates new documents on behalf
//  of requesting OLE containers by using information
//  specified in the document template.
m_server.ConnectTemplate(clsid, pDocTemplate, FALSE);

Change the underlined bit to TRUE are see how things go. Don't be scared to look at the source code for MFC (or whatever libraries you're using)!

Steve

want article for com and dcom

Honeyboy_206-Jun-10 16:35

Honeyboy_20

6-Jun-10 16:35

I want to know general question for using com and dcom ...

Is there any article that talks about com and dcom for beginners using c#

i am search in google but not find any simple article , plz help me ?

Directshow Audio Question

godspeed1233-Jun-10 8:07

godspeed123

3-Jun-10 8:07

Hi
I have successfully got Directshow outputing a video from C++ MFC using Sample Grabber, but I can not figure out how to play the audio with this.

I have attached code snippet of what I have done currently, can anyone tell me what I need to do to get audio stream to work. I have added the sound renderer filter, just dont know how to connect it with the rest of the graph.

Thanks

HRESULT hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);

hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
hr = pGraph->QueryInterface(IID_IMediaEventEx, (void **)&pEvent);
hr = pGraph->QueryInterface(IID_IBasicAudio, reinterpret_cast<void**>(&m_pAudio));
hr = pGraph->QueryInterface(IID_IMediaSeeking, reinterpret_cast<void**>(&pSeeking));

hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pGrabberF);

if (FAILED(hr))
{
// Return an error.
}
hr = pGraph->AddFilter(pGrabberF, L"Sample Grabber");

CoCreateInstance(CLSID_DSoundRender, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&g_pSoundRenderer);
hr = pGraph->AddFilter(g_pSoundRenderer, NULL);

// hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pGrabberF);

// hr = pGraph->AddFilter(
if (FAILED(hr) )
{
// Return an error.
}

pGrabberF->QueryInterface(IID_ISampleGrabber, (void**)&pGrabber);

//ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE));
mt.majortype = MEDIATYPE_Stream;
//mt.subtype = GUID_NULL;//MEDIASUBTYPE_RGB24;
hr = pGrabber->SetMediaType(&mt);

hr = pGraph->AddSourceFilter(fileName.AllocSysString(), L"Source", &pSrc);
if (FAILED(hr))
{
// Return an error code.
}
hr = ConnectFilters(pGraph, pSrc, pGrabberF);

// Create the NULL renderer and connect

hr = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, reinterpret_cast<void**>(&m_pNullRenderer));
hr = pGraph->AddFilter(m_pNullRenderer, L"NullRenderer");
hr = ConnectFilters(pGraph, pGrabberF, m_pNullRenderer);

MIDL2020 : error generating type library [modified]

forexsurfr29-May-10 19:09

forexsurfr

29-May-10 19:09

Can someone help me with this error? I am compiling an IDL file and am getting an MIDL2020 error. This error is defined as
"General access denied error". I am working on a Windows Vista machine and have searched for a solution but cannot find anything that solves this. Any suggestions would be greatly appreciated. Below is the complete compilation error:

midl\oleaut32.dll : error MIDL2020 : error generating type library : SaveAllChanges Failed : .\spellcheck.tlb (0x80070005)

Here is the program:

//Creating the interface
import "unknwn.idl";
[object,uuid(C73BA5B4-B466-4348-8CC2-E6B48998B3F7)]

//Defining the interface
interface ISpellChecker : IUnknown
{
HRESULT CheckSpelling([in,string] char *word,[out,retval] BOOL *isCorrect);
HRESULT UseCustomDictionary([in,string] char *filename);
}

//Define type library
[uuid(C81C9C52-008B-429d-8533-262E90A1D0D5)]
library SpellcheckerLib
{
[uuid(57B7A8A0-E4D7-11d0-818D-444553540000)]
coclass CSpellChecker
{
interface ISpellChecker;
}
};

modified on Sunday, May 30, 2010 10:46 AM

Re: MIDL2020 : error generating type library

forexsurfr30-May-10 7:29

forexsurfr

30-May-10 7:29

I obtained the answer for this on another board. Basically, the problem is that I did not sign-on as administrator on my Visual Studio program.

Windows 7 starting new app instance from Visual Studio 2005

StevenS_Dev21-May-10 9:42

StevenS_Dev

21-May-10 9:42

Something puzzling is happening and I don't understand why. I tested using both my C# and VB.NET test apps and both result in the same behavior. When I run the application I have the following line (C#):

m_COMApp = new SignalServer.Application();

No matter what I do, I always get a new instance of the COM server, even if the server is already up and running. This does not happen in XP and I don't recall it ever happening under Vista (I plan to re-test that this weekend as I have Vista at home). This only happens when I run the COM client directly from within Visual Studio. I even changed my reference to point to another version of the server, and it still wanted to load the server found in the original directory.

I decided to run the application by double-clicking in Explorer and then I get the expected behavior. That is, if a server is already running, it will simply attach to the currently running server. Anyone know why I get the other behavior? Some thoughts are:

1) I am on Visual Studio 2005. Maybe this won't happen in 2010.
2) All the applications are 32-bit apps and the OS is 64-bit. Maybe because of the x86 directory names, things get a little messed up?

Anyone else experience this? Thanks for any information.

Re: Windows 7 starting new app instance from Visual Studio 2005

Randor 28-May-10 4:17

Randor

28-May-10 4:17

Are you running Visual Studio with UAC elevation?

Best Wishes,
-David Delaune

Re: Windows 7 starting new app instance from Visual Studio 2005

StevenS_Dev28-May-10 7:38

StevenS_Dev

28-May-10 7:38

Aha! Thanks. That was the problem. I turned off UAC and everything works just as I would expect (like on XP)! I always leave UAC turned on because it's great for finding issues our customers will run into. I didn't even think about turning it off this time around.

Getting COM Error: Scalar deleting destructor.

KTTransfer20-May-10 21:10

KTTransfer

20-May-10 21:10

Hi,

I am working on Excel Automation.

Implemented the logic to retrieve all the running Excel instances, now I am getting IDispatch pointer. Assigning this IDispatch Pointer to Excel object.

Following is the code:

IDispatch* p=NULL;
HRESULT hr = AccessibleObjectFromWindow(hwnd, OBJID_WINDOW, __uuidof(IDispatch), (void**)&p);
if(hr == S_OK)
{
try
{
Excel::WindowsPtr pWindow = NULL;
HRESULT hr = p->QueryInterface(__uuidof(IDispatch),(void**)&pWindow);
Excel::_ApplicationPtr xl;
xl = pWindow->Application;

But getting com exception at above line. The com error: _Vfpointer: scalar deleting destructor(unsigned int) m_hresult:"Member not found".

I googled but there is no clarity in solution.

If any clue, please let me know.

Thanks in Advance.

Regards,
KTTransfer.

Re: Getting COM Error: Scalar deleting destructor.

Stephen Hewitt20-May-10 21:54

Stephen Hewitt

20-May-10 21:54

KTTransfer wrote:
Excel::WindowsPtr pWindow = NULL;
HRESULT hr = p->QueryInterface(__uuidof(IDispatch),(void**)&pWindow);

What's the deal with this? You'd hope Excel::WindowsPtr wraps an IDispatch pointer (does it?).

Try this:

Excel::WindowsPtr pWindow = NULL;
HRESULT hr = p->QueryInterface(&pWindow);

Steve

Re: Getting COM Error: Scalar deleting destructor.

KTTransfer20-May-10 22:34

KTTransfer

20-May-10 22:34

I tried this,in this case I am getting "hresult hr" as "E_NOINTERFACE".

Re: Getting COM Error: Scalar deleting destructor.

Stephen Hewitt22-May-10 22:09

Stephen Hewitt

22-May-10 22:09

I'd take it at its word.

Steve

Application attempted to perform an operation not allowed by the security policy

NarVish19-May-10 1:38

NarVish

19-May-10 1:38

Hi,

I created windows application which reads the text file and loads into datagridview on clicking Open button. I would like to use this windows app in Internet Explorer browser. I created the below html and tried to access in IE. The design was shown perfectly and I clicked on Open button and selected text file in File Dialog box and I got the below exception. I found several posts regarding this issue in google. But those didn't solved the problem. Please guide me to resolve this issue. Thanks in advance..

Exception: "application attempted to perform an operation not allowed by the security policy. To grant this application the required permission, contact your system admistrator or use the Microsoft .NET Framework Configuration tool."

<html>
 <body color=white>
   <hr> 
	<font face=arial size=1>
	 <OBJECT id="myControl1" name="myControl1" classid="ActiveXDotNet.dll#ActiveXDotNet.myControl" width=800 height=450>
	 </OBJECT>
	</font> 
  <hr>
 </body> 
</html>

ActiveXDotNet.dll is the application dll
ActiveXDotNet is the namespace
myControl is the class name

TROUBLE Passing BYTE Array from Client to COM OUTPROC Server [modified]

K ARUN KUMAR17-May-10 18:22

K ARUN KUMAR

17-May-10 18:22

Hi,

I have an outproc server Executable which exposes an
Interface IServicer.

IServicer has a Method GetBytArray([in]BYTE* bytArray).
This method has to get a Byte array from client and
utilise the values of the array.

When iam calling this Interface method from client by
passing a byte array of size 10, at the server iam
only able to access the first element of the array.
i.e only first element of the array is marshalled from
client to Server. This is happening only in the case of
OUTPROC Servers. How can i access the entire BYTE array
without utilising VARIANT or SAFEARRAY concepts?

modified on Tuesday, May 18, 2010 1:00 AM

Re: TROUBLE Passing BYTE Array from Client to COM OUTPROC Server

Stephen Hewitt17-May-10 19:59

Stephen Hewitt

17-May-10 19:59

Where is the size_is[^] attribute (and others like length_is)? Given the client and server are in different address spaces clearly this information is required (COM isn't psychic).

Steve

Re: TROUBLE Passing BYTE Array from Client to COM OUTPROC Server

K ARUN KUMAR17-May-10 21:07

K ARUN KUMAR

17-May-10 21:07

Hi Steve,

Thanks for the Info.
I tried using Size_is option. Still nor working.
Can you give me a working Client Server Code?

Thanking you.
Arun

Re: TROUBLE Passing BYTE Array from Client to COM OUTPROC Server

Stephen Hewitt17-May-10 22:33

Stephen Hewitt

17-May-10 22:33

Did you register the proxy-stub? I'm betting no! Anyway I hacked this together:

The client:

#include "stdafx.h"

#import "../Server/Debug/Server.tlb" no_namespace

void DoIt()
{
	IServicerPtr p;
	HRESULT hr = p.CreateInstance(__uuidof(Servicer));
	if (SUCCEEDED(hr))
	{
		BYTE data[] = {1, 2, 3, 4, 3, 2, 1};
		p->SetData(sizeof(data), data);
	}
}

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
	CoInitialize(NULL);
	DoIt();
	CoUninitialize();

	return 0;
}

The server's IDL (extract).

[
	object,
	uuid(3D71D2F1-E297-4B26-B2AC-32EA22EFC2B4),
	helpstring("IServicer Interface"),
	pointer_default(unique)
]
interface IServicer : IUnknown{
	[helpstring("method SetData")] HRESULT SetData([in] ULONG size, [in, size_is(size)] BYTE * pData);
};

The server (extract):

STDMETHODIMP CServicer::SetData(/*[in]*/ ULONG size, /*[in, size_is(size)]*/ BYTE * pData)
{
	ostringstream oss;
	for (ULONG i=0; i<size; ++i)
	{
		oss << static_cast<int>(pData[i]) << " ";
	}

	MessageBoxA(NULL, oss.str().c_str(), "Server", MB_OK);

	return S_OK;
}

Steve

Re: TROUBLE Passing BYTE Array from Client to COM OUTPROC Server

K ARUN KUMAR17-May-10 23:30

K ARUN KUMAR

17-May-10 23:30

Hi Steve,

Thanks a lot for the code.
How to register the Proxy-Stub of my Outproc dll or exe?

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