Re: Need help to solve issue with COM interface - COM Discussion Boards

quantimizer18-Feb-10 17:49

18-Feb-10 17:49

You can also use the option of RemoteServer present in the Project properties tab . Vb makes the vbr file which can be accesible by the remote machine . the option is useful if you have made the ocx or active x exe projects

Re: accessing a com from remote machine

tasumisra18-Feb-10 18:35

tasumisra

18-Feb-10 18:35

Hi quantimizer,
Thanks for replying me...

actually question was like there is COM+ component lets say "Maths",it been registered with machine A

there is machine B over Network it does not know anything abt machine B except component name and methods

so how can machine B use the component of Machine A.

i guess can it be done Via URI and RPC...i am just not sure...

Thanks

vikas da

Help in presentation

tasumisra16-Feb-10 18:28

tasumisra

16-Feb-10 18:28

Hi Guys,
Good Morning/Evening,

i have to give a presentation for 45 mins about COM+.

can somebody suggest me what and all i should include here to make the presentation better...

Thanks
Vikas

vikas da

Re: Help in presentation

Richard MacCutchan16-Feb-10 19:28

Richard MacCutchan

16-Feb-10 19:28

Take a look at the COM articles here on CodeProject for ideas. Frankly if you need to ask this question you may like to reconsider this task.

txtspeak is the realm of 9 year old children, not developers. Christian Graus

Need help to solve issue with COM interface

sukumarvenkata16-Feb-10 3:28

sukumarvenkata

16-Feb-10 3:28

Hi all

we have com objects which needs to be shared between two worker threads.to provide effective

synronization b/w worker threads we have choosen Single Threaded Apartment(STA).i am able to register

and retrieve the interface from GlobalInterfacetable successfully with the help of

registerInterfceinGlobal and GetInterfcefromGlobal api's.but the problem comes up when i invoke any

method with the interface retrieved from Globalinterfcetable.the HRESULT status is 0x80010105: The server threw an exception.

can any one tell how to sove this issue

Thanks in Advance

sukumar

Re: Need help to solve issue with COM interface

Jonathan Davies16-Feb-10 12:21

Jonathan Davies

16-Feb-10 12:21

Hard to say without seeing your code. Are you doing something like this:

//Use GIT to store IWebLog marshalled interface so can call, unmarshall and use from write thread
g_pGIT = 0;
ATLTRACE("Messemger: Calling CoCreateInstance on CLSID_StdGlobalInterfaceTable\n");
hr = ::CoCreateInstance(CLSID_StdGlobalInterfaceTable,NULL,CLSCTX_INPROC_SERVER,IID_IGlobalInterfaceTable, reinterpret_cast<void **>(&g_pGIT));
if(FAILED(hr))
{	
	nErrID = IDS_CREATE_GIT_FAILED; 
	__leave;
}

// Registers a specified interface on an object residing in one apartment of a process as a global 
// (process-wide) interface, allowing other apartments access to that interface.
hr = g_pGIT->RegisterInterfaceInGlobal(m_pIWebLog,IID_IWebLog, &g_dwCookie);
if(FAILED(hr))
{
	nErrID = IDS_REG_OBJ_IN_GIT; 
	__leave;
}

Re: Need help to solve issue with COM interface

KingsGambit16-Feb-10 19:14

KingsGambit

16-Feb-10 19:14

You can consider CoMarshalInterThreadInterfaceInStream() and CoGetInterfaceAndReleaseStream() functions as well.

Re: Need help to solve issue with COM interface

Roger Stoltz16-Feb-10 22:03

Roger Stoltz

16-Feb-10 22:03

Make sure that

all threads that create COM servers are pumping messages, i.e. they are UI threads
every thread that do any kind of COM stuff initializes the COM library with a call to ::CoInitialize() or one of its equivalents
your proxy-stub is properly registered, or your typelib is properly registered if your doing typelib marshalling

Using the GIT for marshalling works very well.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

How to compile COM components in Visual Studio(2010).NET written in VC6.0 OR Visual Studio.NET(2003)[modified]

glitteringsound16-Feb-10 1:24

glitteringsound

16-Feb-10 1:24

Hello,
I have to compile COM components written in VC 6.0 or edited and
modified in Visual Studio 2003 in Visual Studio 2010. It is giving
error messages like

' error C1189: #error : This file requires _WIN32_WINNT to be
#defined at least to 0x0403. Value 0x0501 or higher is recommended'

IntelliSense: #error directive: This file requires _WIN32_WINNT to be
#defined at least to 0x0403. Value 0x0501 or higher is recommended'

It given the error in the conversion report that atl support is
eliminated.Can any body tell a way around to compile and build COM
components that were originally written in VC 6.0 or Visual Studio
2003.NET

Regards
Muhammad Usman Khalil

modified on Tuesday, February 16, 2010 7:32 AM

Re: How to compile COM components in Visual Studio(2010).NET written in VC6.0 OR Visual Studio.NET(2003

Richard MacCutchan16-Feb-10 2:43

Richard MacCutchan

16-Feb-10 2:43

The compiler is telling you what is necessary, so you need to do what it says. Using newer compilers/libraries than were available in VC 6.0 means you have to change up to the new rules, and fix anything that works in a different way.

txtspeak is the realm of 9 year old children, not developers. Christian Graus

Creating Multiple instances for com object problem

Ash_VCPP15-Feb-10 23:30

Ash_VCPP

15-Feb-10 23:30

Hi All,

I am using one com dll and have multiple clients on the same machine which are creating pointers for same interface, so is there can be any conflict.

Example:

SomeComComponentLib::IsomeInterface objInterfaceptr;

.....create instance

Now all the client applications are using objInterfaceptr in same way...Please provide me some suggestion to avoid conflict.

Thanks A Ton
Ash_VCPP
walking over water is just knowing where the stones are.....

Re: Creating Multiple instances for com object problem

KingsGambit16-Feb-10 21:15

KingsGambit

16-Feb-10 21:15

I guess there won't be any conflicts as COM components are not confined to a single process.

Createing an Automation for COM object in plain C

noel115-Feb-10 22:41

noel1

15-Feb-10 22:41

I'm trying to implement a COM obj. IUnknown, IDispatch based with automation.
I’ have implemented standard COM in plain C (it is registered - with name, CLSID, InProcServerPath...).
The client for this obj. in C uses CoCreateInstance and it works fine.
CoCreateInstance refers directly to Interface thru obj. CLSID and interface IID.
I'd like to expand this implementation and provide an Automation for this object.
At the current moment when I'm trying to implement a client in script language - the client requests for IID_IUnknown, IID_IDispatch (inside ClasFactory), but not for IID of my Interface.
When I implemented IDispatch methods - GetTypeInfoCount returns E_INVALIDARG.
The Question is how to Implement an automation in plain C, with no IDL, TypeLib etc...
Any Suggestions might be useful.

noel

Re: Createing an Automation for COM object in plain C

KingsGambit16-Feb-10 21:22

KingsGambit

16-Feb-10 21:22

May be you can go through the "COM in Plain C" series in the following link: http://www.codeproject.com/script/Articles/MemberArticles.aspx?amid=88625[^]

Message Removed

10-Feb-10 18:59

John-EE

10-Feb-10 18:59

Message Removed

Re: C# Button Click for UART COM

«_Superman_»10-Feb-10 19:07

«_Superman_»

10-Feb-10 19:07

You're in the wrong forum.
COM here stands for Component Object Model and not serial port.

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

Microsoft MVP (Visual C++)

Clipboard through COM

Adriaan Davel3-Feb-10 22:17

Adriaan Davel

3-Feb-10 22:17

Hi all,
Is it possible to read / write data to / from the clipboard using a COM interface? I'm writing a Silverlight app and the SIlverlight framework only allows for reading & writing text, I however need to write a JPEG byte array, and I'm running as a trusted application so I have extensive COM available.

My second question is around how to write binary data to the clipboard so that Excel sees it as an Image (SL does not have an Image object type), anyone ever done that before?

____________________________________________________________
Be brave little warrior, be VERY brave

Re: Clipboard through COM

Stephen Hewitt4-Feb-10 23:34

Stephen Hewitt

4-Feb-10 23:34

Check out the OleGetClipboard[^] function.

Steve

Creating a COM object from a regular DLL (C++)

etomacruz3-Feb-10 16:07

etomacruz

3-Feb-10 16:07

I have a regular DLL created in C++ that can run VBScript procedures from a VBScript file. The DLL is able to pass variant strings and safearray as parameters to script procedures. However, for a vector of name-value pairs I want to pass it to the script procedure by wrapping the vector in a COM class and passing its IDispatch pointer as parameter to the script. Is it possible to have a COM class and create the COM object inside a regular DLL, and then get its IDispatch interface to a variant variable? If yes, how (sample codes if possible)?

Re: Creating a COM object from a regular DLL (C++)

Stuart Dootson3-Feb-10 20:21

Stuart Dootson

3-Feb-10 20:21

If you want a set of name-value pairs, why not convert the vector to a VBScript Dictionary[^] object?

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

CodeProject MVP for 2010 - who'd'a thunk it!

Re: Creating a COM object from a regular DLL (C++)

etomacruz3-Feb-10 23:06

etomacruz

3-Feb-10 23:06

Looks like it will solve the problem since it has IDictionary interface that I can use in C++, and it will be easier to implement than creating COM object in the regular DLL. Thanks, Stuart!

COM requirment

davarun19-Jan-10 4:59

davarun

19-Jan-10 4:59

Hi I got a requirment like ,

I have student interface IStudent(has properties like name, age, course), similarly ICourse (has properties like course name, student name).

how do i get list of students who attending a particular course ?

thanks

Re: COM requirment

Richard MacCutchan19-Jan-10 8:49

Richard MacCutchan

19-Jan-10 8:49

Enumerate the values of each, compare and count. There is not enough information in your question to provide a sensible answer.

MVP 2010 - are they mad?

Re: COM requirment

«_Superman_»19-Jan-10 18:46

«_Superman_»

19-Jan-10 18:46

This looks like a typical RDBMS "requirement".

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

Microsoft MVP (Visual C++)

Re: COM requirment

davarun20-Jan-10 3:55

davarun

20-Jan-10 3:55

yes this my qn looks like RDBMS query , but is it possible to do that in COM >?

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