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| 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
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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.....
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I guess there won't be any conflicts as COM components are not confined to a single process.
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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
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You're in the wrong forum.
COM here stands for Component Object Model and not serial port.
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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
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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)?
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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!
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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!
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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
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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?
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This looks like a typical RDBMS "requirement".
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yes this my qn looks like RDBMS query , but is it possible to do that in COM >?
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hi
Microsoft.Office.Interop.Excel.ApplicationClass ExcelApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
// in this line of code:
ExcelApp.Application.Workbooks.Add(Type.Missing);
error:
Old format or invalid type library. (Exception from HRESULT: 0x80028018 (TYPE_E_INVDATAREAD))
can any one help me ?
H.R
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What exactly does it do? I have been browsing the Direct3D API code and I see most interfaces are declared using DECLARE_INTERFACE_ providing the derived interface name along with the IUnknown base as that is what DECLARE_INTERFACE_ is for; deriving from a base. What I've read elsewhere is that DECLARE_INTERFACE is for declaring interfaces when there is no base interface but my impression was that all interfaces derive from IUnknown somewhere up the tree so what does DECLARE_INTERFACE do?
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When I look at where it's defined, I see these comments:
* DECLARE_INTERFACE(iface) is used to declare an interface that does
* not derive from a base interface.
* DECLARE_INTERFACE_(iface, baseiface) is used to declare an interface
* that does derive from a base interface.
Note the distinction between DECLARE_INTERFACE and DECLARE_INTERFACE_
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
MVP for 2010 - who'd'a thunk it!
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Yup. That's what I read as well. My point is, if IUnknown is a required common base interface to every COM interface then why does DECLARE_INTERFACE(iface) even exist? If IUnknown is a required base interfact then EVERY declaration should have a DECLARE_INTERFACE_(iface, IUnknown) somewhere up the hierachy. But some don't. They just have DECLARE_INTERFACE(iface) with no reference to IUknown whatsoever.
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DirectX contains non-COM interfaces such as ID3D10EffectType that are declared with DECLARE_INTERFACE...
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
MVP for 2010 - who'd'a thunk it!
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Thanks! I just did some reading off the back of your reply and I see that MIDL is not used soley for COM operations but for RPC in general. I was not aware of that. Thanks for pointing me in the right direction.
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Hello guys,
I would like to have a wrapper for Rcom server in C#. I do not know what a wrapper is or how to create it.
This is what i did and i do not know if i am right or wrong.
I opened a project in C# which is integrated to R, using two dll files and this is what i did:
Open Project -> References -> Add References -> COM -> RCOM 1.0 type library (located at library/rcom/libs/rcom_srv.tlb)
This creates a dll file in my system named Interop.RCOMServerLib.dll. Is this what is meant by the wrapper file. I have no clue, its just a wild guess. and if this is the right thing i am talking about then how can i view the content of the dll file to know what all functions it is using.
I need some help here.
Thanks,
SJ.
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What is it that you're trying to do?
It could be that you're have an unmanaged COM component that you want to use in C#.
This is done using COM interop or also called P/Invoke.
You could also access a C# component or assembly from unmanaged code.
This is using a COM Callable Wrapper (CCW).
This is also called reverse P/Invoke.
The following link will help you -
COM Interop[^]
Exposing .NET Framework Components to COM[^]
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This is what i wanted. A com wrapper, which can be interchangeable between programs and can be used to check what all functions that com can execute. if this is a dll file or tlb file then how can i open it or view it to know all the functions it will execute.
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