Hi, I've got a UserControl created years ago in VB6. I can migrate the project which uses this control into VB.NET 2003. Everything's fine. But... When in the form class, if I do such a thing: Me.MyUserControl.Cursor = Cursors.Hand there is just no effect while I can do it well with any ....more >>

Hi everyone, I'm writing a little tool for a Windows CE 4.2 handheld device in C# (VS 2003, Compact Framework). I need to import functions from a dll supplied by the manufacturer. The header file includes the following declarations: enum DLBT_PicoWizardCallback { DLBT_CALLBACK_FNC,...more >>

I have an assembly in VB.Net that has a single ComClass in it to allow existing VB6 applications to use it. I've recently had to upgrade it to VS 2005 and in doing so found more classes in the assembly now appear to be visible to COM. To counteract this I have set all .Net classes and asse...more >>

Hello, I have been muddling through posts about this sort of thing for days and my understanding is the framework should be able to convert my string to const char* by default (without any kind of explicit conversion/marshalling) but I get the following exception when I do. {"Attempted...more >>

When we do interop between managed and unmanaged code, one of the most hardest thing is memory management. When we should allocate memory and copy data? Who is responsible for freeing memory? How about object life-time? It's a very big problem to me. There is no such valuable stuffs which summar...more >>

Hi, I'm working against a large system written in VB6, and have to display some forms through COM from .NET. However, I can't get this to work. When I try to show a non-modal form from ..NET, I get an exception with the following text: Non-modal forms cannot be displayed in this host app...more >>

For example: [DllImport(...)] public static extern void MyFunc( [MarshalAs(UnmanagedType.LPWStr)] out String myString); If native code allocated myString using CoTaskMemAlloc, is it freed automatically here? What if the string was allocated using HeapAlloc -- how would it know ...more >>

Apologies for the repost, this is due to me not doing it correctly to fit terms of an MSDN subscription. I've built a tlb for Word 2000 in VS 2003, and it's failing intermittently with the error above. The general idea I'm using is as described in this: http://www.codeproject.com/dotnet/O...more >>

I'm attempting to have a MTS VB COM DLL make a call to a C# .net DLL. My problem lies with the .net DLL accessing config values in machine.config: strIP = ((NameValueCollection)ConfigurationSettings.GetConfig("mySettings"))["myValue"]; The call to GetConfig returns null. This works when ca...more >>

Our Automation Add-In has some methods that return object types Excel not fit for Excel (one of the methods retunrs a custom collection for example). Is there some way to hide this method so the end user won't try and use it as a worksheet function, yet have it visible so that it can be used ...more >>

What's the C# syntax for getting a pointer to a struct, so you can pass it as an untyped parameter like lParam? And please nobody tell me that I can alias PostMessage and type wParam as ref NMHDR because I already know that. There is a way of getting a pointer to a struct or a variable and ...more >>

Hey All, Simple yes / no question that I haven't been able to find a simple yes / no answer to. If I build an Outlook addin in VS 2005, will it be or can it be compatible with Outlook 2000? Thanks & Regards, TC ...more >>

In VS 2005 and Excel 2003. I am writing an Automation Add-In in C# and don't want to expose the Object methods (GetHashCode, GetType etc.) to end users to put in their cell formulas. A post here http://groups.google.com/group/microsoft.public.dotnet.framework.interop/browse_frm/thread/fbc3f32...more >>

Hello. I have managed to use the saveas method to both excel and word. Now it's only the powerpoint remaining... This is how I have written it: theActivePpt.SaveAs(filename, Microsoft.Office.Interop.PowerPoint.PpSaveAsFileType.ppSaveAsDefault, Microsoft.Office.Core.Ms...more >>

Hi, I'm struggling with the following problem: I have a large unmanaged buffer, allocated with VirtualAlloc for performmance reasons. I use this buffer to load prepared bitmap image data into it. For displaying, I tried to instantiate a bitmap object the following way: // ButPtrStart p...more >>

I'm rewriting one of our Windows Service previously written in C++ in .NET. The service is calling COM objects in a COM+ server application on the same machine (no call occurs from COM+ to my service). The Service is running under the LocalSystem account. When running the service, the C++ c...more >>

I have a 3th party dll writen in C. I have no problem calling most functions in the dll from the managed code. But there is a function that take a function pointer for setting a callback function that I am having problems with. I have the following code: First in a wrapper class [DllIm...more >>

I need to figure out how to terminate a thread while it is blocked trying to create a COM object via interop. In a worker thread, I do something like this: Type t = null; Object activatedObject = null; Legacy.IScheduled comObject = null; t = Type.GetTypeFromProgID(ProgID...more >>

If I write a pure C# application, only using the standart publi API, no interop, the same binary should work well on32 bit, 64 bits and perhaps on the compact framework as well if I link against it. Now how could I achieve the same thing if I do interop and I have a managed C++ API? let ...more >>

Hi, I want to return an array of structures from a C# dll to native C++ client application. The structure looks like this: public struct mystruct { public string strName; public string strDesign; public bool bValid; public bool bLocal; pub...more >>

I'm interfacing with a mostly undocumented 3rd party COM object in C#. It seems to be working, but I'm not sure if it's working "right". :) I'm a bit confused about the call toWaitForMultipleObjects which is currently defined like so: [DllImport("kernel32.dll")] static extern uint Wait...more >>

Hi all! Check this out: Thread t = new Thread(new ThreadStart(WorkSomething)); t.Start(); if (!t.Join(1000 * 60 * 7)) t.Abort(); WorkSomething is caling unmanaged code at one point (a COM object), and that code sometimes "blocks" and keeps the CPU usage up on 99% without doi...more >>

I have a class within a class library that I have exposed as a COM Server. The library is used by a a win forms app written in C# .NET 2 that creates an instance of the class when it starts. I want to be able to use GetObject from a VBS script to get a reference to the instance of the class t...more >>

We have a COM object that a 3rd party provides us. All of our code is in c#. What we've found is that: In VB.net we call the method and the COM object returns an System.Array of strings, works great. In C# we get an empty System.Array returned. Here is the method we're calling (from...more >>

Hello I am writing a COM object(component) in C#. There is an interface(called IBatchConfig) I should implement in this COM object. In particular, this method of the interface: public void Configure(int hWnd, object pTaskTopic, object pConfigTopic) which brings up a modal dialog of thi...more >>

I'm doing interop by calling method in a c dll. I'm passing strings as Stringbuilder. This works fine in 1.1, but I have now migrated to 2.0 and get AccessViolationException. Message= Attempted to read or write protected memory. This is often an indication that other memory is corrupt. when I ...more >>

I have a c# assembly which i have exposed to a VB COM object. Within the c# assembly, i implemented a singleton pattern which loads the cached from the database if the cache is null. This data does not change often but take long to load so i have cached it. c# private static RuleChecker my...more >>

Hi, I am trying to use a fairly old library with VB.Net It is COM based, so I have just added a reference to it and that bit is OK. The problem is that the main object that needs to be created, must be done from a DLL call. In VB6, this was just: Private Declare Function GetEngineObje...more >>

I'm tyring to create some wrappers to call some C++ code (below) from C#. The MSDN documentation is mainly about using COM to do this, but my code is not COM. In any case, I can't figure out how to do it. I've also tried using SWIG, again with no luck. Is there any MSDN or internet document...more >>

Hi, I have recently upgraded a number of J++ projects to J#. The process was relatively painless and I can create and access objects based on the classes. My problem is that I need to communicate with these components from a VB6 project. I have checked the COM interop option on the configurat...more >>

Hi there, I want a .Net .dll to be available from VB script via COM, so I enabled the "Make assembly available to COM" option and ran REGASM.exe on the .DLL, but I get the following error when I try to access it: 80070002: The system cannot find the file specified. ...more >>

Hello, I have a COM service which is a very (around 25k+ lines of code) written in pure COM and C++. We are planning to write a interop wrapper for this to expose to the new .NET clients(GUI). What will be the best approch to solve the issue. And the COM idl mostly uses complex structures(p...more >>

Hi, I'm using a C DLL in my code which returns an ASCII string value. Problem is that when i get my string special characters as '=E9' or '=E8' or not correctly translated. I try to use CharSet =3D CharSet.Auto but it doesn't change anything :( I try to convert string thanks to Encoding class...more >>

As my earlier post would suggest, I am using some C++ unmanaged DLLs in a C# program. A number of the functions used in the C++ DLL have CString as a parameter. I cannot seem to figure out the correct way to expose the CString objects to the C# DLL call. I was able to get parameters passed using...more >>

Hello all, We have a desktop C# application which heavily uses COM objects from extended MAPI. Sometimes we are seeing really weird behavior, especially with earlier versions of Outlook. I wonder if we are breaking some COM rules here: e.g. we obtain a reference to the interface in one thre...more >>

I am trying access a class in a native C++ DLL in C# but the DLL crashes whenever a member variable is access. I have no problem running functions (add, getTest, setTest) when they access member variables (like int val below). As soon as val is accessed (even in the constructor) the C# program g...more >>

Need help from Microsoft team for frequently reported .NET problem in newsgroups with mixed dll assemblies. I have a VB.NET webservice written in VS2003 targeting .NET 1.1. As the webservice reads MS Word .doc files, it has to call a C++.NET assembly to access the windows structured storag...more >>

I need to create an email message from my Windows application, address it and populate it with a given body of text from a Word document. I am using VS2005 and C#. If found an example that should work, namely the "How to automate Outlook and Word by using Visual C# .NET to create a pre-popula...more >>

Hello, If I export an assembly using tlbexp to a .tlb,and try to import the assembly in say vc6.0 using #import "dir\bin\myexport.tbl" I get the error message: typelibrary not imported .. Can't load load dll If I copy the .tlb from my collegue (procduced on his system with the same dotnet...more >>

thanks in advance... while trying to pass an IntPtr into a wrapper DLL, I'm getting an AccessViolationException: "Attemped to read or write from protected memory" I'm using another function in a similar way (except that one passes in the pointer by ref) and that one is working fine (thanks t...more >>

I'm working on deploying serveral windows tools. One is programmed in VB6, the other is in VC++. The VB6 tools is using a C# dll assembly.(It's called A.dll) The problem that I have is I can't make the VB6 tool installed properly. I made this VB6 tool as a package using Microsoft package & de...more >>

Hello, I am using the DecryptFile API - BOOL DecryptFile( LPCTSTR lpFileName,DWORD dwReserved) to decrypt the encrypted files. Encrypted files do get decrypted using this API , but if the file has a "ReadOnly" attribute,then the DecryptFile() API fails. The documentation of the API says "Th...more >>

I've a COM-Component that requires for some callback reasons that the user of the COM-Component implements an interface of the component. While the basic implementation of that interface by managed code is no problem, i've got a problem with a specific method. The method is defined is defined ...more >>

Hello All! I've been trying to come up with a web service which enables me to use outlook remotly with a machine which only has a web browser. I've tried this with windows forms and it worked without any problem, but the same thing fails miserably when used as a web service and gives the ...more >>

Ihave a c# program which is using methods of an unmanaged dll. The problem is that when i try to run the program in a machine where i dont have admin privileges it launchs me a dllnotfound exception despite of being that dll in teh same folder as the executable and being also in windows/system...more >>

I'm pretty familiar with interoping with .NET COM objects in Delphi but I'm having an issue using VC++. I've been reading and trying out the various methods posted on the web but haven't been able to solve the problem. If I could please get some help that would be much appreciated. Currentl...more >>

Does anyone out there know of a really comprehensive guide to writing classes structures and interfaces in VB.Net for dealing with COM objects/Platform invoke, particularly those defined by Microsoft? It seems that every time I have to build some piece of interop that deals with win32 api o...more >>

Hi, I'm using CruiseControl.NET with MsBuild to build 3 versions of my application. Each one requires a different version of a particular ActiveX control and won't build if it isn't registered. The problem is that CC.NET could build any (or all!) version at any time, so registering the correc...more >>

Good Morning, I have a C# class which calls functions implemented in a dll in C++. One of these functions stays as follows: [DllImport("WpcapProxy.dll")] static extern bool ProxyInitializeAdapter(string AdapterName, bool BroadcastMode); I want also to retrieve a byte array from this functio...more >>

Hi, I have a managed C++ library with following class. I am using .NET 2.0 (Visual Studio 2005) Class1.h....Using /clr complie option public ref class Class1 { public: void set(String^ s,int i) { Console::WriteLine("{0}\t{1}",s,i); } void get(String^& s_out,int& i_out...more >>