interop

i am working on a winforms c# visual studio 2008 application. the app talks to excel files and i am using Microsoft.Office.Interop.Excel; to do this. i would like to know how can i make sure that the objects are released even when there is an error? here's my code: private void button1_Click(object sender, EventArgs e) { string myBigFile=""; OpenFileDialog openFileDialog1 = new OpenFileDialog(); DialogResult result = openFileDialog1.ShowDialog(); // Show the dialog. if (result == DialogResult.OK) // Test result. myBigFile=openFileDialog1.FileName; Excel.Application xlApp; Excel.Workbook

I have this enum with String values, which will be used to tell an API method that logs to a server what kind of serverity a message has. I'm using Swift 1.2, so enums can be mapped to Objective-C @objc enum LogSeverity : String { case Debug = "DEBUG" case Info = "INFO" case Warn = "WARN" case Error = "ERROR" } I get the error @objc enum raw type String is not an integer type I haven't managed to find anywhere which says that only integers can be translated to Objective-C from Swift. Is this the case? If so, does anyone have any best-practice suggestion on how to make something like this

I have a new application written in WPF that needs to support an old API that allows it to receive a message that has been posted to a hidden window. Typically another application uses FindWindow to identify the hidden window using the name of its custom window class. 1) I assume to implement a custom window class I need to use old school win32 calls? My old c++ application used RegisterClass and CreateWindow to make the simplest possible invisible window. I believe I should be able to do the same all within c#. I don't want my project to have to compile any unmanaged code. I have tried

I'm using a COM object from a third party library that generates periodic events. When I use the library from a Winforms app, having the object as a class member and creating it in the main form thread, everything works. However, if I create the object from another thread, I don't receive any event. My guess is that I need to have some kind of event loop in the same thread used to create the object. I need to use this object from a console application. I guess I could use Application.DoEvents, but I'd rather not include the Winforms namespace in a console App. How can I solve this problem?

I am using Microsoft.Office.Interop.Excel to read a spreadsheet that is open in memory. gXlWs = (Microsoft.Office.Interop.Excel.Worksheet)gXlApp.ActiveWorkbook.ActiveSheet; int NumCols = 7; string[] Fields = new string[NumCols]; string input = null; int NumRow = 2; while (Convert.ToString(((Microsoft.Office.Interop.Excel.Range)gXlWs.Cells[NumRow, 1]).Value2) != null) { for (int c = 1; c <= NumCols; c++) { Fields[c-1] = Convert.ToString(((Microsoft.Office.Interop.Excel.Range)gXlWs.Cells[NumRow, c]).Value2); } NumRow++; //Do my other processing } I have 180,000 rows and this turns out be very

I have run in to this problem of converting a C++/CLI pointer to a native C++ pointer. Heres the background: I'm writing a windows forms application using C++/CLI. The application makes call into a number of COM Interfaces. When creating an instance (inside of a C++/CLR class) of a object through the COM interface, i pass in (void**)(&provider) as the last argument to CoCreateInstance , as in: HRESULT CoCreateInstance(rclsid, pUnkOuter, dwClsContext, riid, (void**)(&provider)); However, i get the compiler error: cannot convert from cli::interior_ptr<Type> to void ** . I've done som research