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I have an MFC wrapper over a COM object. There is a function that takes a large number of options, which are mostly optional. How do I pass some arguments but not others?
For what it's worth, the optional arguments are listed as VARIANT*.
Below is the...
Started by Adam Tegen on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
To skip an optional parameter in a COM method.
Written the CDocuments and CApplication wrappers around the COM interfaces, so you could specify the optional parameters as having default value of vtEmpty.
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Hi How to return List from c# method and Use the List return values in c++ can u give guidance how to do it?? I going like following way my complete scenario:
in c# DemoLib.cs
usng System;using System.Collections.Generic; public interface IDiscover { ...
Started by Cute on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
The object type of c#
C# exported as COM
public void GetList(ref object list) { String[] dummyWhen you import a tlb in VC++ and compile it, an intermediate file is generated with extension .tlh;, therefore, it won't get translated....
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I have a dynamic link library written in VC++6. I wrote some code with VC++2005 which calls the native VC++6 library. Whenever I pass std::string to the native library, the result is always garbage. However, this does not happen if I pass other types ...
Started by Lopper on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
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Hi,
Can somebody please explain how the memory allocation/de-allocation occurs when we passing values between COM object and VB.
My Concerns are: 1.
IMyInterface::Method1 ([in] BSTR* pVal, [in] SAFEARRAY(BSTR)* pArray);
do we need to free the allocated...
Started by Nimo on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
The is no in-only....
Also note that BSTR.
For BSTR in C/C++ COM you would use SysAllocString and SysFreeString (on a VC) class that has params declared as out-only or any other IDL supported way.
Is then responsible for freeing the memory.
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What is the difference between the two lines of code below:
CComPtr< IInterface > m_interface; IInterface* m_interface;
I know that CComPtr help eliminate memory leaks, but I am getting inconsistent results. When declaring the pointer with CComPtr...
Started by Reggie McCray on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
When the last reference to an object has been Release() ed, the COM object destroys itselfCComPtr<....
Instance->Release(); instance = 0;
Each COM object implements reference counting.
Release the object...
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I'm trying to send a COM object over a MSMQ message in C++. This is my object :
class ATL_NO_VTABLE CAnalisis : public CComObjectRootEx, public CComCoClass, public ISupportErrorInfo, public IDispatchImpl, public IPersistStreamInit { private: typedef struct...
Started by markitus82 on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
The COM layer code that unpacked it on the far to get the current....
Was not compiled for unicode, but rather as an ANSI project .
The length came through OK.
To a VC++ app.
To pass a VB string under VB6 and VC++6(pro) from a VB app.
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I want to add a VC++ DLL reference into my C# Visual Studio project. But when I try to add it I see, "It is not a valid assembly or COM component".
Please suggest how I can use the VC++ DLL as a reference in a C# project.
Started by Arunachalam on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
You can use the COM object like a C# object (for the most part written....
COM Interop involves creating a COM object in your C++ DLL, and then adding it as a reference.
From C#: either COM interop, or P/Invoke.
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I am a vc++ developer but I spend most of my time learning c++.What are all the things I should know as a vc developer.
Started by yesraaj on
, 8 posts
by 8 people.
Answer Snippets (Read the full thread at stackoverflow):
Here's a link on vc....
There are several other with learning the VC Debugger - spend as much time as you can with it - it can be your best friend.
You could learn ATL + COM if you are into developing COM Components.
Development.
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HI I have a application developed in VC++6.0 ,now I want use some new features from .NET and developed a library, to develop this library I have to use the CLR-VC++ now I packaged this in a DLL.Now I need to call the routine of this DLL in my MFC application...
Started by Sachin on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
I have a native C++ application which uses a managed C++ assembly^ ResolveHandler(Object^ ....
Then use it like any other COM type.
Use ClrCreateManagedInstance to create a COM-Callable-Wrapper for the object you want to call.
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Hi i have got a ScreenCameraSDK and it comes with a 11kb dll file, it has a documentation too which lists the functions which can be used. It says
ScreenCamera SDK ActiveX Reference Documentation
ActiveX Reference
The ActiveX ID on the system is: ScreenCameraSDK...
Started by Anirudh Goel on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
First of all you have to do this is #import the dll, and the compiler will automatically generate all required definitions from... .
If you want to create wrapper class you could read to this article .
Use this manual to add ActiveX control in your project .
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