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I am having trouble with some objects. I'm getting access violations when trying to use some of the methods in the object, which I think is due to not initializing the object when I create it..but there's the problem, I can't use the new operator to create it because it complains about virtual functions. Here's the different ways I've tried to initialize it
1:
IDgnWords words = new IDgnWords() ;
Errors (some of them anyway):
error C2259: 'IDgnWords' : cannot instantiate abstract class due to following members:
warning C4259: 'unsigned long __stdcall IUnknown::AddRef(void)' : pure virtual function was not defined
2:
IDgnWords* words ;
words->Dump( CComBSTR("C:\\words.txt") ) ;
Error: Access Violation when reaching the Dump function
3:
CComPtr<IDgnWords> words ;
words->Dump( CComBSTR("C:\\words.txt") ) ;
Error: Run Time error. No message box pops up, but I can't step any further in the code while debugging.
The class has no initialize functions so and I think this is where I'm having trouble. Is there something I should be doing to initialize the objects?
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The most significant information is done by your first attempt:
- error
C2259: cannot instantiate abstract class due to following members: unsigned long __stdcall IUnknown::AddRef(void)
As the compiler said, you cannot instantiate this class in any way, because it misses something; if you write the code of that class the solution is obvious: implement unsigned long __stdcall IDgnWords::AddRef(void) and this will fix you problem - by writing
IDgnWords* words; you have allocated only a pointer to that class, but you should initialize it with new IDgnWords() before use it. If you don't do it, the pointer hold a random address and trying to use it generates a memory protection faultCComPtr<IDgnWords> words; declares a smart-pointer to the IDgnWords class, then all that I said about IDgnWords* words; is still valid, and this is the reason of your crash. CComPtr simply wraps a IDgnWords* and calls the Release() method for you when the variable goes out of scope
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As for attempt 1, I didn't write the code for the class (it's from Nuance Dragon Naturally Speaking SDK).
For attempt 2, I get the same errors when doing:
IDgnWords* words = new IDgnWords() ; (ie. cannot instantiate abstract class)
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Now one thing that isn't making sense is I used a different class from this SDK and I was able to call
CoCreateInstance( CLSID_DgnVocTools, NULL, CLSCTX_ALL, IID_IDgnVocTools, (LPVOID*)&pIDgnVocTools ) ;
I would think that I would need to create and instance of the IDgnWords object, but there's no CLSID for it. If I don't create and instance of that VocTools object I used in the previous paragraph, it craps out on me just like the IDgnWords object is doing now.
You think this could be the problem? It seems odd to me that creating a "new" object doesn't seem to work for this.
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I thought that IDgnWords was a class that you wrote because COM classes should be created trough their class factory using the CoCreateInstance() function, or queried to another class that you have already instantiated using the QueryInterface() method.
If there isn't a CLSID_ trough that you can instantiate the IDgnWords, probably you should first instantiate another class and then query it for the one you need...
I tried searching the internet for documentation about IDgnWords, but I didn't find anything. Dragon Naturally Speaking is a payed product: have you got any documentation from Nuance? Have they give you any technical contact to ask for?
I'm sorry, but I don't know what else to tell you 
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hi
i have an excel add in application. when i try to install the application on target machine.the add in failed to add.
when i check the add in in excel my add in there but shows in inactive add in application. when i try to add the com in .. its shows me a runtime error occured during the loadin of com add in ... how can i resolve it.
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Hi,
I need to call a function written in C# from the unmanaged code.
The code from where I have to call the function is purely written in VC++ and it come in the unmaged part of the solution code.
Most of the solution is written in C# .NET 3.5.
Please help me out.
Thanks In Advance
Abbas
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Hi
I am using CWindowImpl::create() API which internally call CreateWindowEx() method.
When I test this API of win32 OS. It works fine, but when I test on 64 Bit OS above API failed
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GetLastError() value is 1413
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application get crash in CreateWindowEx() function on 64 Bit Windows XP.
Is there any setting required to work CreatewindowsEx() function in 64 Bit windows.
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am 2009 wrote: Is there any setting required to work CreatewindowsEx() function in 64 Bit windows.
No it works the same. The error code you recieved would imply that something may be wrong with the WNDCLASS Structure[^]. Make sure that you are initializing it to zero:
WNDCLASS yourclass = {0};
The error code may also be caused by using a 32 bit DWORD parameter rather than a DWORD_PTR.
Rules for Using Pointers[^]
Best Wishes,
-David Delaune
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how to set a file name in coleinsertdialog class without opening its dialog. I do not want to call its DoModal function which select a file
COleInsertDialog dlg;
dlg.somefunction = "c:/myfile"
//do not call domodal to to select a file
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Hi all,
I have to implement a COM class with VB.NET. An object of this class has then to be created from a VB6 DLL. The code for the COM dll is very simple:
Public Class AdapterWrapper
Implements SchemaCompInterfaces.IEFAdapter
#Region "COM-GUIDs"
Public Const ClassId As String = "58faad86-bbac-4b20-9ab5-fe32bdac0a68"
Public Const InterfaceId As String = "f8dbb078-5f1e-4304-a390-3e8e88983f98"
Public Const EventsId As String = "113d2163-f8db-4d99-88e5-58d13b8d2cf4"
#End Region
Public Sub New()
MyBase.New()
End Sub
Public WriteOnly Property CurrentSPFProjectStatus() As SchemaCompInterfaces.SPFProjectStatus Implements SchemaCompInterfaces.IEFAdapter.CurrentSPFProjectStatus
Set(ByVal value As SchemaCompInterfaces.SPFProjectStatus)
End Set
End Property
Public Function DocumentExistsInTool(ByRef oDocumentIObj As SchemaCompInterfaces.IObject) As Boolean Implements SchemaCompInterfaces.IEFAdapter.DocumentExistsInTool
End Function
Following many more functions from the IEFAdapter interface...
The dll and tlb are created and registered.
The test code for the VB6 client to use this COM class is also very simple:
Private Sub Command1_Click()
Dim adapter As SchemaCompInterfaces.IEFAdapter
Set adapter = Interaction.CreateObject("MyEFAdapter.AdapterWrapper")
End Sub
Now when I'm running this code, I'm getting the Run-time error '13' Type mismatch in the CreateObject line. Late binding with
Dim adapter as Object seems to work for my test code, but is not a solution for me, because I can't change the proprietary VB6 code where the COM object is created. So somehow the interface "SchemaCompInterfaces.IEFAdapter" is not known... 
Any ideas how to get close to this problem?
In the project properties I checked the flag for registration with COM-Interop. Perhaps something to do with the ClassInterface?
I'm relatively new to VB, so don't answer too complex... 
Thanks in advance!
Alex
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Hi
want to develop 64 bit application for 64 bit windows OS. I tried all VS2005 settings required to compile code in 64 bit. but when I install application , it get installed into C:\programme Files(x86) folder instead of C:\programme Files . Is it necessary to build code on 64 Bit OS.
Thanks
asas
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You can build 64-bit applications on a 32-bit OS using Visual Studio 2005.
Visual Studio uses a 64-bit cross compiler to built 64-bit applications because Visual Studio is itself a 32-bit application.
When installing Visual Studio, this 64-bit cross compiler is not installed by default.
You have to customize the installation and manually select the x64 compiler for installation.
If you're not sure if you've installed the x64 compiler, run the Visual Studio installation again and do a modification to select this compiler.
After the compiler is installed, you can use it by selecting a new x64 configuration from Build -> Configuration Manager -> Active solution platform.
Please note that the target path is different for Win32 and x64 builds.
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Hi
Thanks for your reply.
I did whatever settings required to compile/build 64 bit BHO application.
When i installed this application, it is not get registered with 64 Bit OS and hence no BHO installed on 64 Bit browser.
When i use 32 bit setting for compiling/ building BHO application, it gets perfectly installed. So what may be the reason of not registering BHO application for 64 bit IE browser.
Thanks
abm
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How are you registering the BHO?
Are you using the 64-bit IE?
64-bit BHOs will only be loaded by the 64-bit IE and 32-bit BHOs will only be loaded by the 32-bit IE.
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Hi
Thanks for ur reply,
I used DLLRegister overrided function for registering BHO. I am using 64 Bit IE for this BHO.
Thanks
abm
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Hi
I used DllRegisterServer() overrided function for registering 64 bit COM DLL. I register DLL at Software\Microsoft\Internet Explorer\Toolbar key. It works fine for 32 bit IE, but not work for 64 bit IE. So is there any other key for registering BHO for 64 bit IE.
Thanks
abm
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(kind of a newbie with idl files, so excuse the lingo that could be not so kosher, or if it's more appropriate for the C++ forum)
In our application we generate some COM objects from with "attributed programming" (*)
with VS2008, our main production tool, the generated IDL file contains the following import directives :
import "docobj.idl";
with VS2010, the generated IDL file contains the following import directives :
import "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\wincrypt.idl";
import "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\exdisp.idl";
import "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\shldisp.idl";
import "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\prsht.idl";
import "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\mshtmhst.idl";
import "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\mshtml.idl";
import "c:\program files (x86)\microsoft sdks\windows\v7.0a\include\dimm.idl";
import "c:\program files (x86)\microsoft sdks\windows\v7.0a\include\dispex.idl";
it gives the error :
20> Microsoft (R) 32b/64b MIDL Compiler Version 7.00.0555
20> Copyright (c) Microsoft Corporation. All rights reserved.
20> Processing .\_my_idl.idl
20> _my_idl.idl
20> Processing C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\wincrypt.idl
20> wincrypt.idl
20>C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\wincrypt.idl(47): error MIDL2025: syntax error : expecting a type specification or a storage specifer or a type qualifier near "WCHAR"
20>C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\wincrypt.idl(47): error MIDL2026: cannot recover from earlier syntax errors; aborting compilation
20>LINK : fatal error LNK1240: failed to compile IDL content
So I have 2 questions :
1 - Who/what decides what imports are to be added in the IDL file ? why should it have wincrypt.idl ?
I manually removed the wincrypt import from the the IDL file and compiled it without problem, but that's not a solution since the IDL is auto-generated.
2 - If it gives error on the WCHAR, I assume it's thinking the IDL is in wide-char mode, even is our application is not ?
(*) for example, see : http://www.microsoft.com/mspress/books/sampchap/6426.aspx[^]
Thanks.
Max.
Watched code never compiles.
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Maximilien wrote: If it gives error on the WCHAR, I assume it's thinking the IDL is in wide-char mode, even is our application is not ?
No, the issue is that it has encountered a line containing a WCHAR directive, but WCHAR has not been defined anywhere. You probably just need to #include <windows.h> at the beginning of your source.
Sorry, I don't know the answer to Q1.
It's time for a new signature.
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How to create and initialize COleDataObject class object.
If i have a character array which contains some data then how to pass this array data to COleDataObject class object.
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i am cretaing a COM object,
aftrer ading reference to a Dll using the add reference dialogue,
i get the error below.
i don't understand what is means and how to solve it.
Error 1 The type 'Sosinpw.SheetStatus' exists in both 'd:\projects\necoscan\necoscan\obj\Debug\Interop.Sosinpw.dll' and 'c:\Program Files\DRS\SKW\Interop.Sosinpw.dll'
thank you.
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