I'm trying to call a COM object using C# but having no luck getting values back for passed in ref objects. I've tried the same call using VB.NET and can get data back. How would I implement the following in C# This is the method I am calling, which populates ref paramters with results. S...more >>

Hi, I have a C++/CLI dll that have some methods that I need to use (or call) from my legacy C++ application/dll created using Visual Studio 6.0. Will really appreciate some suggestions on what are some of the ways to do the above so that I can call the functions I wrote in C++/CLI (Visual...more >>

Hello, I have C# code that calls a native function that takes a struct as a parameter. It works fine. Equivalent VB.NET code passes the structure by pointer (instead of copying it directly onto the stack) and that causes my native code to behave incorrectly. This is the declaration o...more >>

Hi everyone, I'm attempting to rewrite an ATL component in .NET. The only part of the functionality i'm having problems with is a particular method that needs to write to a passed IStream. My calling application is written in using MFC. I've attempted in my new c#.net component to accept...more >>

I don't know where to report a bug to MS. Here is the bug description: I have an activeX created by ATL/C++, which shows a tree view with multiple state checkboxes and icons. It works fine to embed the activeX to the main form of a C# form application. If I create another subform to host the...more >>

Hi, From an vb.net-outlook-add-in ... how do I catch an event telling when an appointment has been saved? Thanks!! M O J O...more >>

I'm kinda new at .NET programming so please excuse my ignorance... I'm trying to use C# to download info from a data service which only has a C API. Using P/Invoke I've gotten as far as establishing the connection and sending requests. However, I would like to, as much as possible, use the ...more >>

Hi, (I'm using vb.net 2005) I'm trying to send an email and mark the "follow up". Here's my code... Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim oApp As New Microsoft.Office.Interop.Outlook.Application ...more >>

Hi, I'm using vb.net 2005 and I'm trying to send an email, get the GlobalObjectID, find the sent email by the GlobalObjectID .... but I don't know how. I know that the GlobalObjectID is not an exposed property (yet) and I have no clue on how to use it then. Do you have an example??? ....more >>

Hi everyone, I've created a shell extension (like gmaildrive) that I want to do the Drag-n- Drope operation if someone can help me? ...more >>

Hi, I have to develop an Addin which will insert a new menu item in the context menu (Copy, Cut,....) of Outlook 2007, when right clicked on the Body of the received message. I am new to the Outlook 2007 automation. I want to use C# or VC++ 2005 for development of this Addin. Kindly ...more >>

Hi all Up until now, I've been able to use something like this to pick up a running instance of an office application xl = (Excel.Application) System.Runtime.InteropServices.Marshal.GetActiveObject ("Excel.Application.12"); if (xl != null) { } /etc. ...more >>

Help please Ho can I write following (from C#) thing in VB.NET ? new IntPtr(&mode) mode is a instance of some structure. I cannot find any solution. I need to pass the pointer to a structure to COM+ object Thanks Tomas ...more >>

I have to emulate a C++ Com Component in C# . One of the methods I am to provide int the C# COM is (the C++ signature): STDMETHOD(SetAttributeArray)(/*[out]*/ long* retVal, /*[in]*/ VARIANT AttributeArray); My Plan is this: [Guid("03AD5D2D-2AFD-439f-8713-A4EC07054432")] interfa...more >>

I am writing a native C++ plug-in for a program that will act as an interface for managed code. My managed code needs to be able to call methods in an active instance of the native plug-in running in its host program. Is the following the best way (or even possible) to accomplish this? 1...more >>

I'm trying to acces some C logic through .Net and am consistently getting an AccessViolationException. I watered down everything to the most basic level I could and I'm still getting it. Here's the C code: void __declspec(dllexport) getText(int num, char* date_text) { sprintf(date_text, "N...more >>

Hello, we have a WinForm Application in which we are embedding Word via DOSFramer. Some installations ran into an error when closing the printpreview: word crashed. For Word 2003, i found the solution from Brian at http://groups.google.at/group/microsoft.public.dotnet.framework.interop/msg...more >>

I have a C# DLL that calls a function in a C++ DLL. The C++ function displays a window that has a combo box (CComboBoxEx) control. If I enable visual styles in my C# DLL, images do not appear in the combo box. How can this be fixed? Thanks, Mike ...more >>

Hi I have created a couple of Windows Forms controls in C# either by composition or by subclassing existing controls. I'm able to use these controls as ActiveX controls by using "register for COM Interop". I then access the control in a old application written in C++ (using VS 205). This ...more >>

Hi friz, I want to convert word document (with all formatings & images) to a PDF file. How i can achive this. Please Help....more >>

Hi, I have a .net-dll that I'm using from VB6. And when I do a for each on my Collection class (Reports), i'm getting a "Type mismatch" error. If I change the InterfaceType attribute to InterfaceIsDual or InterfaceIsIDispatch, it works fine. Can anyone tell what I shoud do to get this ...more >>

I am using CFormView and CWinFormsControl in C++ to show a C# control. The control includes a toolstrip container and various toolstrips. If all the toolstrips are hidden (visible = false) on any of the container's panels, a mouse click will cause a stack overflow. The problem is in the PreTra...more >>

My C# program is being passed a COM object. I can successfully read and write properties in the COM object by using code like this: object tsFields = tsInterface.GetType().InvokeMember("TSFields", BindingFlags.GetProperty, null, tsInterface, new object[] { }); What I would like to be able ...more >>

Hi, I have a piece of software which creates multiple calendars. And then I get the MAPIFolder for a specific calendar like this: MAPIFolder calendarFolder = this.GetOutlookFolder(); What MAPIFolder I get is defined by the properties in this class and doesn't really matter here. I get a...more >>

Hi, I'm using Microsoft.Office.Interop.Outlook. I can get the Appointments in the default calendar, but I would like to create new calendars using code and iterate through the items in these new calendars. Can anybody link to an example, as most examples show you how to create new appointm...more >>

Hi How do I get information on each COM DLL my .NET application is loading? I need to print out the version info on every DLL for debugging purposes during the start-up. Thanks in advance ag ...more >>

I was told to move my question to this forum: --------------------------------------------- I have a C# class which is being called via COM interop from a legacy c++ program compiled under VC7 (VS2003). It worked well before we converted our C# codebase to VS2005 (.NET 2.0) and now we have the ...more >>

Hello, First of all, thanks for the all the help. I'm new to .NET and I have to do some unusual coding (at least I cant find much info around). I'm doing a program that has to call some functions in a MFC DLL. My problem is that some of these functions receive MFC types as parameters (CStr...more >>

1. If Marshal.GetNativeVariantForObject allocates memory on the (e.g. for a string or an array) how do I free this memory? (i.e. the managed version of VariantClear()) 2. How do I release a COM object. - With one instance it is easy. ComClass obj = new ComClass(); .... ReleaseComObjec...more >>

I tried to use Microsoft.VisualBasic.Interaction.GetObject() to get a reference to a running instance of an application that registers itself as a COM server. There seems to be a problem with the the GetObject() method. According to the MSDN documentation GetObject() takes two augments as ...more >>

I'm using in a c# project an activeX component (which I can't modify) with these 3 methods: public void PutData(ref int pData, int nBytes); public int GetDataSize(); public void GetData(ref int pData); The same functions, in a c++ project are: void PutData(long* pData, long nBytes); lon...more >>

Hi - My .NET application makes a call to a DCOM server through an interop assembly generated by VS 2005. The program runs fine under .NET Framework 2.0 (x86 version), but when it runs under .NET Framework 2.0 (x64 version), the following error occurred: System.Runtime.InteropServices.COM...more >>