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I'm new to .NET but am trying to pass a string pointer as the lParam of a SendMessage call from some managed code to my DLL written in unmanaged C++. What I've done so far is this (in VB.NET as that's what my colleague wants to use, but if you want to give me a solution in C# that would be f...more >>

In years passed I recall learning that there is a way for unmanaged code to setting up an applicatoin context in a different directory. The goal is to enable the users to write their own .net modules that my program will load and call. I just cannot figure out what I should be looking for in th...more >>

Hello, When I use the following structure at the Load event I get a type load exception. [StructLayout(LayoutKind.Explicit)] public struct TempStruct { [FieldOffset(0)] public int a; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)] [FieldOffset(0)] public string b; }...more >>

I am trying to return the variant type vbEmpty from a .NET .dll to Classic ASP but it is not working correctly. Here is the code that I am using... In C#: return Microsoft.VisualBasic.VariantType.Empty; However, this returns an integer value of 0 (the value of the constant) and not the ac...more >>

Hi, I am a new guy in C#. I try to pass a struct with a point to a mfc dll. But I am failed. Anybody knows what I must do? The following is my code: ------------------------------------ C++ dll: class MyStrStruct { public: int size; int* buffer; }; extern "C" bool PASCA...more >>

Hi, I'm experiencing some kind of thread behavior problem in a WinForms app in Vb.Net 2.0. Actually I'm doing some huge interop using DirectShow to interact with my miniDV camera. The problem is that if I put the code to read the camera's timecode inside a button_click routine it works just...more >>

We're having some trouble getting our .NET 2.0 application working with an ActiveX control. We're using the RTList control (http://www.xyris.com/products/rtlist.htm). I've created the interop assemblies using aximp. It appears that we're communicating with the control and get back the res...more >>

Hi I would like to attach to a running excel application. What I would like to do is presenting the user a list of excel applications that are currently visible. The user will specify one of these application which will be the target for some data that will be exported from my program. ...more >>

Hi All, I have developed a .net dll which using COM interops interface. I developed and VB6 application to utilize the dll file. It is working fine when testing in Windows XP. After that, I tested the application in NT4 workstation, it prompts thtat ActiveX object cannot be created. ...more >>

When I load my VS2003 program to VS2005 environment, I received the following error during Form loading. I am trying to find a right COM for the following type. Any help will be greatly appreciated. thanks! ------------ Could not find type 'AxInterop.MediaPlayer.AxMediaPlayer'. Please mak...more >>

We have a project in .NET 1.1 , some of the .NET methods take COM interface reference pointer as a parameter, somehow we have to call Marshal.ReleaseComObject to release the COM Object, otherwise the COM object will never get release, Even we call gc.Collect() But the same code compiles in .NE...more >>

Hi, I'm using a ATL ActiveX on a C# windows form (Visual studio 2005). That works great. However, I wanted to create a C# user control which would wrap this ActiveX. Therefore I created an empty user control and just put this ActiveX on it. No problem so far. However, when I wanted to test ...more >>

Hi, I am trying to call an old Delphi .dll // DELPHI definition (should return an array of 256 chars) function DiskSaveFooter(missionname,qlffilename,id:pchar):TCharArray; export; // My C# definition [DllImport("qn.dll", CharSet=CharSet.Ansi,CallingConvention=CallingConvention.StdCall)] ...more >>

Hi, Could somebody point me to some sample code to call a .NET from MFC (no managed extensions please) ? I understand that this involves using COM Interop but a complete example will be a great help because I believe there has to be some additional plumbing on the .NET side. Thanks in advance...more >>

I am attempting to incorporate a 3rd party DLL that is unmanged into my managed project. The problem as you might have guess is regarding getting a callback to occur. The one big problem is that I don't have access to either the code or the developer at this point hence my posting here. I h...more >>

I am trying to write a utility that will go through all of my COM dll's that I am using in my .NET app and update the Interop wrappers for them. To do this, I am using tlbimp and have done everything I want with only one problem. Some of my COM dlls reference other COM dlls, so tlbimp is gener...more >>

I just got my first box running Vista. (yihaa!) My happiness didn't last long - my code broke. This snippet works in Windows XP but not in Vista. TransFleet.Application application = null; Object appObject = Marshal.GetActiveObject("TransFleet.Application"); application = (TransFleet.Appl...more >>

Hi. We are using a third-party unmanaged DLL via PInvoke, but we have discovered that over time the application's process is accumulating memory and analysis has shown that this is because the unamanaged DLL is aggregating state between calls. We do not have control over the third-party DL...more >>

Hi All, I have this following code which works fine in 1.1 but gives runtime exception 2.0:- Reflection Code to get One Property from COM Object ------------------------------------------------------------------------------- Dim objSession as Interop.ComObj.Session Dim objAgen...more >>

Hi all! I am debugging a VB6 client application through to a dotNet 2.0 class library (dll) using the following in my app.config files... <configuration> <!--system.windows.forms jitDebugging="true" />--> </configuration> With the system.windows.forms.jitDebugging="true" uncommented...more >>

I'm writing a C# app which will populate an Excel spreadsheet. The app references Excel using COM. I have Office 2007 on my machine, but the machine which will be running the application will have Office 2003. Therefore, when I added the Excel COM reference, I chose the Excel 11 one. N...more >>

Hi, I'm trying to decide what is the best way to pass a data structure to a P/Invoked Win32 function. As far as I can tell there are two options: 1) Use the Marshal class to allocate native memory an copy the data into it. 2) Use the GCHandle to pin a managed object that has the exact same...more >>

Hi, I'm trying to iterate through the contents of a folder in a pst file using VS.NET 2005 + SP1 and Outlook 2007 running on 64-bit Vista Business. Virtually all the examples on Google and MSDN seem to be on how to write add-ins - I don't want to do that. I did find this article: http:...more >>

Seems like there is no way to enable this using .NET interop COM method signature: HRESULT CSomething::put_IDispProp (IDispatch* obj) ..NET InvokeMember call: object[] args = new object[] { null }; // <-- passing null IDispatch* comObject.GetType().InvokeMember("IDispProp"...more >>

I'm getting the following message when debugging between VB6 and my COM Wrapper (.net)... The callee (server [not server application]) is not available and disappeared; all connections are invalid. The call may have executed. (Exception from HRESULT: 0x80010007 (RPC_E_SERVER_DIED)) This ...more >>

I am having problems deserializing an object in my namespace extension. I keep getting "unable to find assembly"! The assembly is referenced but still I get the error. Has anyone had a similar issue where they could point me in the right direction? Thanks, Simon. ...more >>