Hi, I'm not sure, but I may have found a memory leak between vb6 and .net. Of course, it is possible that I just don't understand something correctly or I did something wrong. In any event, what I've done is create a C# class library that exposes an interface through COM. If I instantiat...more >>

Hi! [partly a cross-post with win32.gdi, but noone answers questions there] I'm working on a C# project where we need to get glyph vertices from fonts. There are several examples on how to do this in C++, but interop not being my strongest side, I have some questions: 1) Most gdi functi...more >>

I am trying to develop an ATL COM object together with a C# web application that will host it. I am following the COM Interop Part 1: C# Client Tutorial, Example 2, The C# Code Approach from the April 2004 MSDN library exactly. But the client will not release the COM object. The COM object is ...more >>

Hi all, I got two library files (*.lib) and some header files which is written by ANSI C from a third party. Inside the header files, there are many struct, variables and methods declare inside. I am now want to use them in C#. I have been looking for a solution for a long time. I think th...more >>

I have a C struct and a DLL with a single function. I've used the MarshalAsAttribute, ref, DLllImport, StructLayout, UnmanagedType, etc... declarations and I'm not having any luck. I'm not really clear on when you can use the special declarations for automatic marshalling or when (or how) ...more >>

I'm working on a project that entails calling into a legacy C DLL. The original unmanaged test code (ancient C++) works OK, but after generating managed C++ shells for calling the DLL via C#, performance has taken a hit. I can't explain it--Smaller scale tests run OK, but stressing the code cau...more >>

I'm trying to run an application under another user within a winform app writen in C#. I have tried a number of different things, but it seems that the CreateProcessWithLogonW function should work to do what I need to do. This appears to work just fine in Windows 2000 and XP with service pack ...more >>

This seemed to be a popular topic a while back and I haven't seen any recent posts on it, so I'm going to ask: It is currently unsupported to create a UserControl in .NET and do the interop wrappers to make it function _properly_ when used as an ActiveX control. Is there support for this plan...more >>

I am calling a method from C# to an unmanaged dll that includes two callback methods, one for reading from a buffer and one for writing to a buffer. The callback methods have 3 parameters, all IntPtrs. The first callback to each method works fine, but the second time the read callback is cal...more >>

Is it possible to access the statistics of a remote DTC via .Net (C#) at all? Cheers Ollie Riches http://www.phoneanalyser.net Disclaimer: Opinions expressed in this forum are my own, and not representative of my employer. I do not answer questions on behalf of my employer. I'm just ...more >>

I'm creating an VB.NET class the implements 2 COM interfaces, call them IFoo and IBar. If I create an object in my local process, I can call IFoo->QI and get back the IBar interface, but if the object is hosted in a different process, the QI fails. Any ideas how I can get this working?...more >>

Hi All, I have a library(.dll). It's develop by VC++ 6.0. I would like to know how C# can used my library? When I add reference at C# project it will show my dll is not a valid assembly or COM component. How I fix this problem. I don't want rewrite my dll because it's very big project. ...more >>

Hi! I'm sure this question have been asked before, but I cannot seem to find it in here. I've have a classlibrary written in .net that's exposed to com via interop (registered in the GAC and so on). Is there anyway to call overloaded functions from a script environment? Example: Pub...more >>

I have a struct in C with a function ptr in a dll called Image.dll: The functionptr is initialized and called in the C-code The application completes the above operation and then terminates with an exception of System.OutOfMemoryException //------------C-Code---------------// typedef struct...more >>

Hi, We have a legacy application (which is quite complex and large) written in VB6. We are currently upgrading it and enhancing its functionalities. We have also adopted .NET as our new development evironment. As a result of this, the upgraded version of our application contains code which ...more >>

I'm getting a COM Object, but I'm not totally sure which COM Interface(s) it implements. How can I find this out?...more >>

hi all running into C# COM interop issue here. we are using a COM+ component to send email through the *wonderful* lotus notes server. since the COM instant might crash/hang, so we use a thread to do the sendmail process, when the COM object hangs or reach timeout. we will killing the thread t...more >>

I have a component im using in my application. When I call a method myComponent.slowMethod() my entire application hangs until slowMethod() completes. I have tried using the .net threading model to trigger the slowMethod inside a thread wrapper class but I still have the same behavior. Is ...more >>

Hello, I'm attempting to write a tooltip class that uses NativeWindow so I can get the InfoTip effect, but I'm having troubles right off the bat. I've included alot of the code to help out those who feel they might have some insite. I do NOT want someone elses project or control. I'm doing...more >>