Hi , I have a project which was developed on VC++ 6.0 Win32 and I made it as ..dll. it exposes few functions. Then I created a CSharp windows application and want to trying to call those functions exposed by prev .dll. the functions take parameter which is type of structure and pointer ...more >>

Hi, 1 . I create a VC++ Class Library project. 2. added a .h (head file) to the class library project it contain all the enueration and structures 3 .I build the library project into .dll (let say x.dll ) 4.I created a C# project 5. added the x.dll as a reference to C# proejct. I ...more >>

I want to access IOleContainer.EnumObjects() from c#, so I wrapd IOleContainer Interace with managed code, and get the IOleContainer object correctly. but found the Exception of "Object reference not set to an instance of an object". Thanks for any help. Here is the code: //interface IO...more >>

How do you serialize to a file an immutable struct? If I add set {} routines for all my public properties it works. But my intent is immutable Thanks ...more >>

I have a problem with the following C function from a third party DLL: int GetStatus(<params>, OUT BUFFER *status); where: typedef struct { unsigned long length; // length of data below unsigned char *data; } BUFFER; In CSharp I defined the function like this [DllImport("pat...more >>

I have found that ShellCmd example (from .Net SDK) of the shell extension blocks Winkey+E. The example blocks the Winkey+E on Windows 2000 and XP (SP1, SP2). Are there working (non blocking) examples of shell extensions? ...more >>

Hello, I have an application that sometime throws me an Exception when is checking if the user has access to a certain fnction, it uses the Authoritacion Manager Application Blocks. Here's the excetption detail. Exception type: COMException Exception message: A directory service error has...more >>

I'm moving all my stuff to a new machine. One of my control libraries containing FlexGrid, because it's used in an IDE plugin in VS.NET, has to be registered for COM interop. Registration works fine on my old machine, but on the new one I get: COM Interop registration failed. Could not find a ...more >>

Hello, I've found two ways to debug my interop assemblies in my ASP.Net application and they both have some problems that I haven't been able to overcome. Google and MSN are running out of answers ;) Here' my scenario... Method 1. - Run my DLL in VB6 and attach to VB6.EXE in Visual Studio. ...more >>

When trying to connect to COM interface from unmanaged code I get an = error 1073741819. The failures is intermittent, when I try to catch the = exception it is not a _com_error. Can anyone help me out? I am trying to figure out what this error could mean. --=20 MICHAEL CARR...more >>

I've generated an interop for a given COM component. I receive new version of this COM component frequently, perhaps weekly. Will I need to regen a new interop dll for each new version that I get? Is there a way to generate an interop dll that is version independent? Thanks Stan...more >>

I would like to utilize a multi-precision library (GMP) built unmanaged C++ (won't build as managed code and don't want to write a managed wrapper) in my C# programs. I think using interop will be the solution with least code but am unsure the best approach and would like some insight. Here is...more >>

Hey, I'm using an Interop of the Word Com object to create a new word document. All went well, but after I finish creating the document, I close it, and even call the Quit method of the Application object, but still the WinWord process stays alive... What do I need to do to make the word objec...more >>

Hi all, How to pass filename chosen by user (with filedialog) to Workbook.OpenText method? When I use FileDialog.SelectedItems property IDE is showing error, that this property is not indexed. -- Przemek Now playing: nothing...more >>

Hi All, I need to offer scripting possibilities in my app, and have to use MSSCriptControl for some reasons. I would like to use the feature that's called variable number of arguments, that is done in C# using the params keyword. However, if I AddObject the instance to the MSScriptControl, ...more >>

the COM interface method IDL is: HRESULT Evaluate([in] SAFEARRAY(IpdgMarketEnv*) *mktenv) and .NET wrapper makes it Evaluate(ref Array mktenv). , and it crashes on invalid type. How do I modify the assembly and change the signature of the method in order for it to accept correct type? - Th...more >>

Hi, A have some numerical C code that I want to paste into a C# project. For example: public static unsafe void eigen( double **a, // ..other arguments where a is a matrix, stored as a jagged array (pointer to pointer). To call this function, I first allocate a matrix as follows: ...more >>

Hello, I have a VB.NET program that works with COM Interop. It works fine on my PC (XP Pro), but when I install it on other PCs (also XP Pro) using regasm it works on some PCs and not on others. If I install it using gacutil it works on all PCs. Any ideas why this is happening? Than...more >>

I have a program written in JAVA,which makes use of java.net.URL's openStream() method to read a content from particular website. After I migrated this program to J# and make some neccessary changes on the code, I've finally successfuly compile it and run in on .NET Framework. Then, I make t...more >>

I have a following doubts in PINVOKE. Can anybody offer help on these? We are trying to make calls to win32 API, where we are having the following structs and enums in win32 class. How to convert the following in DotNet? 1) struct Test_FOO { enum Type { Type_A = 1, ...more >>

Hi all, I have an unmanaged DLL created using VC++ 6.0 which exports a few C++/STL functions. Im calling the exported function from a managed C++ DLL, created using VS.Net 2005 beta 2. I need to pass a string list by reference to the unmanaged function. The unmanaged function modifies...more >>

I am curious how to work with VARIANTS in C# that are returned by a COM class via interop. I understand the interop process recognizes it as System.Object, but how can I get say the type of the data out of the VARIANT that is now considered a System.Object object? Ex. COM: IMyInterface : ID...more >>

When trying to connect to COM interface from unmanaged code I get an = error 1073741819. The failures is intermittent, when I try to catch the = exception it is not a _com_error. Can anyone help me out? --=20 MICHAEL CARR...more >>

Hello Everyone, I am trying to access a C# class from vbscript. All is file, except for the case when I want to use optional parameters or function overloading. As I found out, optional parameters are not supported by C#, function overloading is not supported by COM. There is an attribute: ...more >>

Hi All, We have unmanaged DLL created using VC++ 6.0 which exports functions like the following- long __declspec(dllexport) TestFun(std::string filePath); When we are calling this function from C#/.NET using Interop, we get the exception with message "Attempting to read or write protected...more >>

Hello, I have an old C/C++ Project and implemented a C#-DLL, which fires an event. I can call C#-Functions from C++ Assembly, but I don't know how to get a callback from C# to C++. I followed this link to get an event-handling, but it's only for VB/C# and not for C++/C# http://msdn.microso...more >>

I have discovered that Excel 97 VBA does not support the IDTExtensibility2 interface. But passing "Me" as a parameter from Excel 97 VBA as an Excel.Application to a COM Add-in created from VB.NET, I have been able to give control of the calling instance of Excel 97 to the VB.NET project. I ha...more >>

We have a .NET application that uses ADOMD to query a MS analysis OLAP cube. In a typical query, we get data for about 3 dimensions (800 x 15 x 2 entities) and then iterate over the resulting cell set to extract information. Occasionally, we see "Object is no longer valid" exceptions being th...more >>

Hi, I am trying to call function from Win32 DLL from C#.The DLL is written with VC++. When I attach VS.NET IDE to running managed application for "CLR" and "Native" mode I can debug from C# code to win32 code. But when I try to put breakpoint in managed code after Interop call, application cr...more >>

I have tried variations of using iRet = WNetOpenEnum( _ RESOURCE_SCOPE.RESOURCE_GLOBALNET, _ RESOURCE_TYPE.RESOURCETYPE_ANY, _ 0, _ nr, _ ptrHandle) Which works well, except that it returns b...more >>

I am new to VB.NET coding for excel, and so am probably missing something real elementary here: I can get an Excel 97 VBA module to successfully include a reference to a VB.NET project that contains the Connect class with the necessary Guid and ProgId attributes and the five IDTExtensibility2 ...more >>

I want to pass a single dimensional float array to a method written in C. The method modifies the values in the array and returns these. I can also pass the C code a parameter to indicate the number of elements in the array. Since I am in control of the C code, I can modify the parameters to ...more >>

Hello, I cannot find how to create a COM object located on a server Machine. Can you help please? Thanks. -- ---- http://michael.moreno.free.fr/ ...more >>

I have an application in which I'm using the AxSHDocVw.AxWebBrowser control to navigate to a webpage. For a demo I'd like to be able to hard code some credentials for this control to use. What is the easiest way to do this in c#? Thanks, G ...more >>

I have a method "int TestMethod(MyClass[] pMyClass);" in a class exposed as COM and I'm trying to call it from VB6. All other methods work except for ones with arrays. I get the error "Function or interface marked as restricted, or the function uses an Automation type no supported in Visual ...more >>

Can anyone tell what error code 1073807364 is? We get this when trying = to connect to a .NET COM Component from unmanaged code. --=20 MICHAEL CARR...more >>

Hello, Using C++/CLI to build a managed class library for DirectShow, and wondering what the implications of the following would be: void RenderFile( String^ file ) { m_pGraph->RenderFile( (LPCWSTR)Marshal::StringToCoTaskMemUni( file ).ToPointer(), NULL ); } Everything works fine...more >>

Hello all, I am trying to implement some objects that need to be called from both ASP.NET and ASP Classic. On the ASP Classic side, the objects will be cached in the ASP Application object. I have built COM objects in .NET before, and have created an ASP Classic web site that uses some o...more >>

Hi all, I have been following Amit Dey's example of ActiveX event sources and VC++ clients at codeproject.com (http://www.codeproject.com/com/vbeventswithvc.asp#xx846270xx). My requirement is somewhat different however, in that I have a .NET assembly that needs to provide a COM interface to e...more >>

Hi I have a Delphi dll written by someone else, and I need to use it in my ..NET application. How do I do this? I have very little info on the dll, basically all I have is the following two function declarations: function VerifyUser(DatabasePath: string; UserName, Password: string; ou...more >>

Hi: In VB.NET 2005 Express beta 2, I cant debug my application when I insert a breakpoint it never is reached, a message like "No debug symbols loaded, breakpoint will likely not be hit" Any idea ? Thx, Fede ...more >>

Hello, I'm on my way from COM/ATL world to .NET/COM world and I have the following question. I have a .NET class exposed to COM. I need some extra data to be put to the registry when my assembly is being registered, apart from the data set by the RegAsm.exe. In the ATL we have wonderful .RGS ...more >>

Hi there ! There is a problem of calling NET assemblies from unmanaged code via COM ( NET component registered as COM one) . We have executable which calls this COM component methods which in turn calls other NET assemblies. Some of the calls get information from config file creating corr...more >>

Hello, I want to access a COM object from .NET. The interop wrapper works like a charm from any .NET application. However, as soon as I try to access it from ASP I get: "System.InvalidCastException: QueryInterface failed" Any ideas? Regards, Marvin...more >>

I'm trying to interop (P/Invoke) with gdiplus.dll on Windows 98 but the .NET runtime cannot find the DLL. The DLL is on the system. If I set the environment variable "path" to include "C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322" then the runtime will find the DLL. My question is, how ca...more >>

In VB.NET I imported Excel and Graph libraries, but xlLocationAsObject is found in neither. Where is it? Also, can anyone tell me an easy way to find out which library contains a given name like this? (so I won't need to bother a newsgroup about this next time!) Thanks in advance, |\|....more >>

I'm having a problem in developing a very simple Add-in application for Excel. I've tried quite a few approaches and googled quite a bit but can't get things right. When my Add-in menu item is selected code executes to gather input from a user, make a remote call, acquire data and write th...more >>

Hi everyone, I've recently ported a COM component into .Net using a runtime callable wrapper. The component in question is SQL Server's DTS package, if that helps. The import worked well enough....now I'm having some trouble using the component. Specifically, this code below from VB6, ...more >>

I have a large VC 6.0 service that uses .NET for some of it's processing = in an attempt to migrate to pure .NET slowly. This service runs 24x7x365 except when it runs out of memory.=20 The culprit seems to be when I access the .NET components the = obj->Release() does not really release the...more >>

Hi all, The type library is an important file for COM interop, without which unmanaged code can't interact with managed code. When I use .NET 2003, I can sucessfully generate .tlb file from a .NET Dll (built with /clr:oldsyntax switch) - using tlbexp or Regasm /tlb. The above technique never...more >>