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Questions tagged [interop]

Interoperability is a requirement for one computer system or programming language to work with another.

Interoperability is a requirement for one computer system or programming language to work with another.

A number of computer systems, especially Microsoft's .NET Framework, reduce this term to Interop.

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IntPtr, SafeHandle and HandleRef - Explained

Without pointing me to MSDN, could someone give a concise, clear explanation of the purpose of each of these and when to use them. (IntPtr, SafeHandle and HandleRef)
user62572
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COM object that has been separated from its underlying RCW cannot be used

I have some COM component which I call from some c# dll. I also have a winforms app that uses that .dll. When I close the app I get this exception: COM object that has been separated from its underlying RCW cannot be used. The stack trace…
Yaron Naveh
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Microsoft.Office.Interop.Excel really slow

I am exporting a 1200 X 800 matrix (indexMatrix) to a excel file using the standard Microsoft.Office.Interop.Excel. The app works, just that it is really really really slow( even for the 100 x 100 matrix) . I also export in a text file through a…
Alex
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Server execution failed (Exception from HRESULT: 0x80080005 (CO_E_SERVER_EXEC_FAILURE))

I am trying to convert a .xls file to an .xlsx file on the server-side using Microsoft.Office.Interop.Excel.Workbook class as follows: workBook.SaveAs("FILENAME_HERE", XlFileFormat.xlOpenXMLWorkbook, Type.Missing, Type.Missing, Type.Missing,…
Tamas Ionut
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Is C NULL equal to C++11 nullptr

I like to use nullptr instead of NULL. Now I call a C function (from libjansson in this case). NULL in C is implementation defined. For nullptr I found that "A null pointer constant is an integral constant expression (5.19) rvalue of integer type…
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Clean up Excel Interop Objects with IDisposable

In my company the common way to release Excel Interop Objects is to use IDisposable the following way: Public Sub Dispose() Implements IDisposable.Dispose If Not bolDisposed Then Finalize() System.GC.SuppressFinalize(Me) End…
ruedi
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Disposing of Microsoft.Office.Interop.Word.Application

(Somewhat of a follow on from the post (which remains unanswered): https://stackoverflow.com/q/6197829/314661) Using the following code Application app = new Application(); _Document doc = app.Documents.Open("myDocPath.docx", false, false,…
Maxim Gershkovich
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Handling Null Values in F#

I need to interop with some C# code with F#. Null is a possible value that it is given so I need to check if the value was null. The docs suggest using pattern matching as such: match value with | null -> ... | _ -> ... The problem I'm having is…
Jonathan Sternberg
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A Simple C# DLL - how do I call it from Excel, Access, VBA, VB6?

I have a simple class library written in c#. using System; namespace TestDll { public class Test { public string HelloWorld { get { return "Hello World"; } } …
divinci
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Add offset to IntPtr

I'm looking for a way to perform pointer operations in C# or .NET in particular. I want to do something very simple Having a pointer IntPtr I want to get IntPtr object which points to 2 bytes ahead. I read some post that the foolowing snippet will…
Marcin Rybacki
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Excel Interop - Add a new worksheet after all of the others

I am trying to add a new worksheet to an Excel workbook and make this the last worksheet in the book in C# Excel Interop. It seems really simple, and I thought the below code would do it: using System.Runtime.InteropServices; using Excel =…
JMK
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How do I implement Serializable in Kotlin so it also works in Java?

I have some code that I've been using for years in Java, but need it in Kotlin (its interfaces extend collections interfaces). Some classes are serializable. When I try the obvious, I get "Cannot access 'Serializable': it is internal in…
GlenPeterson
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Call function from DLL?

I'm new to C# and I'm trying to learn to usage of DLLs. I'm trying to wrap my objects in a DLL, and then use it in my program. public class Foo // its in the DLL { public void Bar() { SomeMethodInMyProgram(); } } So I try to pack…
Dominik Antal
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Where is the System.Windows.Forms.Integration namespace?

I can't seem to find it, trying to keyboard input in a wpf form spawned from a winforms form. Found this: http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/442782b1-00a1-4e2e-9cc6-ae99b6699126/ But when I try to use it, VS2008 complains…
Davy8
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Why use FinalReleaseComObject instead of ReleaseComObject?

I know the basic difference as ReleaseComObject only decreases some counter by one and FinalReleaseComObject decreases it to zero. So what I usually hear is, call FinalReleaseComObject because then you are sure that the COM object is really…
Matthijs Wessels
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