Re: using interface - COM Discussion Boards

How to hide one of the pins in the DirectShow Source Filter ?

14-Dec-09 22:42

You are shure that 'magic.Dmagic' interface is implemented in the 'magic.magicClass'?

Be shure that all components are created and running in the same Thread model or you never wont get rid of bad trouble. Dead | X|

Press F1 for help or google it.
Greetings from Germany

Raja Bose C Leo8-Dec-09 21:42

Raja Bose C Leo

8-Dec-09 21:42

Hi,

I don't know exactly is this the right forum to post this question, can anyone tell me how to hide one of the output pin in a direct show source filter?

Thank you in Advance.

Raja Bose

Excel.exe is not getting killed implicitly

KTTransfer7-Dec-09 18:40

KTTransfer

7-Dec-09 18:40

Hi,

I am working on Excel automation using VC++(unmanaged).

imports:

#import "libid:00020813-0000-0000-C000-000000000046" auto_search no_dual_interfaces \
rename("DialogBox", "excelDialogBox") \
rename("RGB", "excelRGB") \
rename("DocumentProperties", "excelDocumentProperties") \
rename("SearchPath", "excelSearchPath") \
rename("CopyFile", "excelCopyFile") \
rename("ReplaceText", "excelReplaceText")

Following are the two issues:

1. Whenever Excel is closed , Excel.EXE is not getting closed.

My application should track opening and closing of Excel.

I released application pointer(Excel::_ApplicationPtr) but same problem.

I googled and got few solutions, but nothing worked.

I tried :

Excel::_ApplicationPtr XL.
And getting the active object of excel using GetActiveObject.

XL->Quit();
XL->Release();
XL = NULL;

but none of these worked.

Is there any similar method like Marshal.ReleaseComObject in UNmanaged VC++?

2. Is there any callback which tracks excel.exe is closed?

Please give me clue to solve these issues.

Regards,
KTTransfer.

Re: Excel.exe is not getting killed implicitly

serzh8316-Dec-09 5:21

serzh83

16-Dec-09 5:21

AFAIK, to close Excel application you have to create it via CoCreateInstance

using interface

Chiman15-Dec-09 1:09

Chiman1

5-Dec-09 1:09

I want to use an interface method in my com class . Now this can be archive by two ways

1) by importing tlb file in idl file.

ii) by including/adding .h file.

Can you please explain the diff betn approach i and ii and in which scenario we should use them?

Re: using interface

Jonathan Davies5-Dec-09 5:03

Jonathan Davies

5-Dec-09 5:03

Reading from my COM IDL & Interface Design by Al Major (Wrox):

#include
The contents of the #included file are placed in the idl as if they had been typed in.

import
Is the standard method for bringing in definitions from other idl, odl or C/C++ header files into the main IDL file

Al recommends: not using #include unless you need to support legacy types and using: import to get at IDL declarations.

Re: using interface

«_Superman_»5-Dec-09 5:04

«_Superman_»

5-Dec-09 5:04

Importing using #import can be used to instantiate a COM component from its type library that is either embedded inside the DLL or as a separate file (.TLB file).
This method prompts the compiler to create the header files which is automatically included in the generated source codes.
It also create smart pointer for all the exposed interfaces using the _com_ptr_t class. The smart pointers will have a naming convention of xxxPtr where xxx is the name of the exposed interface.

The method of #include is a more basic approach where you use the standard COM APIs like CoCreateInstance to instantiate and use the COM component. You will have to manually create smart pointers if needed.

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

Microsoft MVP (Visual C++)

Calling Com object From C# to add 2 numbers

Chrispie1232-Dec-09 7:47

Chrispie123

2-Dec-09 7:47

Good Morning,
I need to call a dll from C# that was generated by magic edeveloper. I think it is a C dll.
It is a program that takes in 3 parameters all integers. Adds the first to and pass the sum to the 3rd parameter.
I have registered the dll in windows and I can add a reference in visual studio via the Project  Add Reference menu.
I have the following code in my project

int a = 5;
int b = 6;            
int sum = 0;
double sumDouble = 0;
sumdll.sumdllClass sdc = new sumdll.sumdllClass();
sumDouble = sdc2.sumdll(ref a, ref b, ref sum);

But if I run it I get the error

Unable to cast COM object of type 'sumdll.sumdllClass' to interface type 'sumdll.Dsumdll'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{3DC9FCBA-9E72-49AA-B597-F9B2603D5EEA}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

the following is available from the intellisense

sumdll.sumdllClass sdc = new sumdll.   
	Dsumdll  		which is an interface
	Sumdll		which is an interface
	sumdllClas		which is a class

And in the line

sumDouble = sdc2.sumdll(
			ref int input1, ref int input2, ref @input)

Does anyone know I am getting this error? Or how to call the dll correctly.
Regards,
Christiaan Pieters

Re: Calling Com object From C# to add 2 numbers

Chrispie1233-Dec-09 18:32

Chrispie123

3-Dec-09 18:32

Ok so I tried to do the same thing in VB.NET. I usally work in a console application for ease and once I have succeded I will convert or redo what every I have to do.
The console application in VB.NET is by default in a module.
If I do the following in VB.NET from the module

Console.WriteLine("Start")
       Dim dllRef As New sumdll.sumdll()  //Only this one method is available… It is indicated as an interface

       Dim a As Integer = 10
       Dim b As Integer = 18
       Dim c As Integer = 0
       Dim d As Double = 0.0

       d = dllRef.sumdll(a, b, c)

       Console.WriteLine("Done")
       Console.WriteLine(a)
       Console.WriteLine(b)
       Console.WriteLine(c)
       Console.WriteLine(d)

Console.Read()
But if I move the same code to a class I still get the same error as before. Why can’t this be called from a class? If I can get this to run from a class I am sure I will be able to call this from C#.
Thanks,
Christiaan

Re: Calling Com object From C# to add 2 numbers

KarstenK14-Dec-09 22:48

Re: Calling Com object From C# to add 2 numbers

14-Dec-09 22:48

I can only give you the advice to use better names for your stuff. You are mixing interfaces and classes. Cry | :((

Press F1 for help or google it.
Greetings from Germany

Md. Marufuzzaman15-Dec-09 4:04

Md. Marufuzzaman

15-Dec-09 4:04

Well.. Do you try to register this dll in to the GAC?

Thanks
Md. Marufuzzaman

Don't forget to click [Vote] / [Good Answer] on the post(s) that helped you.

I will not say I have failed 1000 times; I will say that I have discovered 1000 ways that can cause failure – Thomas Edison.

Is it possible to attach the manifest info to a dll for SxS?

levinp29-Nov-09 21:41

levinp

29-Nov-09 21:41

I'd like to use Registration-Free Activation of .NET-Based Components to make my application side by side.
http://msdn.microsoft.com/en-us/library/ms973915.aspx#rfanetwalk_topic4
From this article, I can't get an idea to slove my issue.
Here is the calling logic in my application. I have a dll(done by delphi) to invoke a .NET COM, but the dll will be loaded in a .NET application. I tried to add a manifest with the executable file name, but always failed to load the .NET COM. (.NET Application <- Delphi DLL <- .NET COM)
I tried a Delphi application to load the .NET COM with manifest file and it is ok. Is it possible to attach the manifest inforamtion to a DLL????

can anyone help?

thanks in advance.

Using COM component invalid pointer error

Ash_VCPP27-Nov-09 1:19

27-Nov-09 1:19

Hi All,

I have created COM component(dll) and created one client to use it, Please finnd the code of client:-

HRESULT hr = CoInitialize(0);		//CoCreateInstance(		SCRIPTOBJLib::IScriptObjPtr sobj;		//sobj-&gt;QueryInterface(IId_,void* &amp;vp);		//HRESULT hRes = CComObject&lt;CScriptObj&gt;::CreateInstance(&amp;sobj);		//CreateInstance(NULL,IID_IUnknown,(void*)&amp;vp);		//HRESULT hres = sobj.CreateInstance  ( __uuidof(SCRIPTOBJLib::IScriptObj) );		//HRESULT hres = sobj.CreateInstance("ScriptObj 1.0 Type Library");		//at this point i am getting the error		sobj-&gt;SetLanguage((unsigned short *)"VBScript");		CoUninitialize();

Please give me some solutions coz i tried every possible way.

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

KarstenK27-Nov-09 1:34

27-Nov-09 1:34

your code isnt readable. WTF | :WTF:

What are the error codes? Google them

Press F1 for help or google it.
Greetings from Germany

Ash_VCPP27-Nov-09 2:15

27-Nov-09 2:15

Hi KarstenK,

I am getting value of hresult= -2147221164

Please find the code below:
HRESULT hr = CoInitialize(0);
//CoCreateInstance(
SCRIPTOBJLib::IScriptObjPtr sobj;
//sobj->QueryInterface(IId_,void* &vp);
//HRESULT hRes = CComObject<CScriptObj>::CreateInstance(&sobj);
//CreateInstance(NULL,IID_IUnknown,(void*)&vp);
HRESULT hres = sobj.CreateInstance ( __uuidof(SCRIPTOBJLib::IScriptObj) );

//HRESULT hres = sobj.CreateInstance("ScriptObj 1.0 Type Library");

sobj->SetLanguage((unsigned short *)"VBScript");
CoUninitialize();

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

User 121625727-Nov-09 2:24

User 1216257

27-Nov-09 2:24

I think that the issue is that you are using getting the ID of the interface:

__uuidof(SCRIPTOBJLib::IScriptObj)

You need the ID of the coclass in the CreateInstance call. It is probably __uuidof(SCRIPTOBJLib::ScriptObj) depending on how the object has been implemented.

Ash_VCPP27-Nov-09 2:31

27-Nov-09 2:31

But from the library i am getting two things:
1.IScriptObj

2.IScriptObjptr

So what else i can try.

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

KarstenK27-Nov-09 2:50

27-Nov-09 2:50

Please use for HRESULT hexadecimal values (Just do it! if you want to run COM)

if you google that (-2147221164 => hex 80040154) you find things like "class not registered". This means that SCRIPTOBJLib::IScriptObj isnt registered properly. ->regsvr32

Press F1 for help or google it.
Greetings from Germany

COM Error: error LNK2001: unresolved external symbol "public: virtual long __stdcall

Richard MacCutchan27-Nov-09 3:46

Richard MacCutchan

27-Nov-09 3:46

I note the poster has two threads going on this question, one here and one in the C++ forum. I have now bowed out.

Ash_VCPP25-Nov-09 23:09