This is a little different than the other DllImport problems I've seen. I'm calling a DLL from C# and it works great when I run inside Visual Studio .NET. But when I try to run my application from the same .EXE file that the project creates, I get "NullReferenceException: Object reference not s...more >>

I developed a COM-visible assembly, created a setup package for it and deployed the component. The wrapper registers successfully on my dev box (XP Pro), but will not register on a Server 2003 box that we have here. I created another COM-visible assembly in the past, and was able to register...more >>

Hi. I'm new to c# .net programming, coming from a java background, and am currently self learning the language trying to prepare a demo of a windows.forms application of our current java client. I've yet to undergo a training course, so im not sure if what i'm doing is correct or not. I'll ...more >>

Hi, I was wondering if anyone could explain why my c# code is not working as expected. See the inline comment for my particular problem, which occurs immediately after the call to FormatMessage: /// <summary> /// Gets the last error that occured on the calling thread. If the last error is a s...more >>

I need to pass a bitmap in the form of a byte array to an existing win32 dll from vb.net. At this point, I'm locking the bitmap data [Bitmap.Lockbits()] and then copying [Marshal.Copy] the data into a byte array on the VB side. When I make the dll call with the array, the app crashs with no e...more >>

Sorry, I'm a bit new to this. I'm writing an app that uses a Microsoft-supplied .Interop type library (for MS Virtual Server) so that I can access their COM API from my forms-based application. Things work fine on my development machine, but if I run them on any other machine (one without M...more >>

Hi all, I am trying to put a Vb6.0 activeX control into a VB.net project. The Vb = 6.0 activeX control works fine in a VB6.0 app. But the problem comes when I close down the Vb.net app. I get = the"exception privileged error". I think it is because the ActiveX = components are not shut dow...more >>

Abstract: A watched folder is monitored for XML files, once the event Created is raised, an Indesign.Application should be created And should process the XML, this works fine using a windows form application. Putting this in a Windows Service gives errors. Description: Error using a VB.NE...more >>

I created a dll in .NET using C# and I need to call this dll from a Visual C++ 6.0 application. I am programmatically calling the regasm.exe as I am getting the installroot registry key, finding the folder, get the exe, then doing a CreateProcess and it seems to function correctly. My problem...more >>

I have an ASP.NET application that exports some data to Excel via Interop. The application is working fine in Windows 2000 Server. Now we are changing our servers and we have installed Windows 2003 Server Enterprise Edition, the application works fine, but it does not export to Excel. I have look...more >>

We have a C# application that hosts a WebBrowser control. The project's output includes the file Microsoft.mshtml.dll whose size is over 8MB. This DLL is more than 20 times larger than our actual application. The large size seems to slowdown our application's startup time significantly. Also it ...more >>

I have a C struct that contains a char* and I am tring to use PInvoke (and C#) to marshal it as a string but it is not working. I was hoping someone has done something like this and will give me a hint on how to get it to work. I also have to add a uchar* that points to the start of a large uc...more >>

I have a managed application that creates an instance of an out or process com server. After releaseing any references to the server, the server lockcount will not go to zero. Only after exiting the managed application will the out of process server lock count go to zero and the process terminat...more >>

I have a C++ client calling a .NET assembly installed in a COM+ application. Client and .Net assembly/COM+ package all run on the same machine. Everything works great...but I have a question about the inner-workings of COM+. Why does COM+ require the tlb file that was generated when the assemb...more >>

Hi All, We have a set of COM Controls (OCX and DLL) that were developed in VC6. We used the .NET Interop to wrap these controls in order to make them useable on .NET environment and from managed code. The whole product is mature now, but recenty a problem occured with one of our custome...more >>

Help, pleeeease. I am attempting to create and then display an excel sheet in a web project. I have it all working nicely, data and formatting. As well it is displaying correctly. everything except for being able to set the pagesetup values in the spreadsheet. I can set them without ...more >>

Hi All, I have written a VB.NET form base application that is using the AxWebBrowser activex control to display a Sharepoint Portal Server website. The bug I am getting occurs when the application successfully navigates to Sharepoint, and only after navigating to Sharepoint, at any time after th...more >>

Hi All, Is there a way to identify given .dll is WIN32 or .NET assembly by looking into PE headers? Thanks, GP. ...more >>

Somebody please explain me why I'm getting 'Object reference not set to an instance of an object.' in the following code - [DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)] public extern static bool AllocateAndInitializeSid( int pIdentifierAuthority, byte nSubAuthorityCoun...more >>

I am trying to write an ATL dll that uses classes from a C# project. The ATL dll is tested from an unmanaged MFC application. The MFC application throws an exception when the method from the ATL object contains managed code. In the ATL project, I added support for MFC and enabled managed code ...more >>

Here is a problem that I thought should be a basic one - but I have not been able to find the information I need. We have a server in C# and an unmanaged client in c++, which calls functions via .net remoting/com interop that return strings. It works perfectly - except that strings in forei...more >>

Hi, I have a problem with using VB6 controls, compiled into an OCX, from my managed code application. I used aximp.exe on the OCX to generate a C# file. I use this file in my solution to dynamically add the controls in the OCX to a C# form. When the application exits I get the following messa...more >>

Specifically, I am trying to use .NET with SolidWorks API. I am trying to implement a version of tlbimp, for converting from a typelib into a .NEW assembly, which may grow into another tool (hence, why I don't just use tlbimp). I copied code directly from MS website here: http://msdn.micros...more >>