com-interop

问题 I have a native Delphi exe which calls into C# dll via COM interop. Here's the simplest case which demonstrate this issue: Delphi: IClass1 = interface(IDispatch) ['{B29BAF13-E9E4-33D7-9C92-FE28416C662D}'] function Test(const aStr: WideString): WideString; safecall; end; var obj: IClass1; s: string; begin obj := CoClass1.Create as IClass1; s := obj.Test(''); // Returns '[null]' end; C#: [ComVisible(true)] public interface IClass1 { string Test(string aStr); } [ComVisible(true)] public class

问题 When I try and call any method on a COM Object that takes one or more arguments, I get the following error on the last argument: Could not convert argument 0 for call to Open. (ArgumentError) Everything works fine when calling a method that takes no arguments, or getting/setting a property. Here is the code that gives me the error above: def new_com_object(prog_id) System::Activator.CreateInstance(System::Type.GetTypeFromProgID(prog_id)) end xls = new_com_object('Excel.Application') xls

问题 I have a question about IPC with COM Interop objects. I want to create and fill with data COM Interop object in one process (for example Windows Service written in C#). Then I want to get it in another process (console application in C#). I know that COM objects don't serialize and they are unmanaged code. I tried realize solution by .Net Remoting (Windows Service is server, console application is client), but I couldn't get COM Interop object in client (I made .net class inherited from

问题 I need to call a .Net Class Library from a vbscript application I have written a C# class library and created a COM DLL component and a type library file I have successfully registered the dll and tlb on my local computer using C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe "C:\user\Visual Studio 2008\Projects\[Sample]\[Sample]\bin\Debug\[Sample].dll" /tlb "C:\user\Visual Studio 2008\Projects\[Sample]\[Sample]\bin\Debug\[Sample].tlb" The dll and the type library file are registered

问题 In my ASP.Net application I'm generating a Excel file using MsExcel Object Libby (Com-InterOp) . The application worked fine in the VS dev. environment. But when I host it in the server I'm getting following error, if I'm no user is logged in to the server through Remote desktop Connection. "Retrieving the COM class factory for component with CLSID {00024500-0000-0000-C000-000000000046} failed due to the following error: 8000401a The server process could not be started because the configured

问题 Trying to automate Outlook as Microsoft.Office.Interop.Outlook.Application myApp = new Microsoft.Office.Interop.Outlook.ApplicationClass(); Microsoft.Office.Interop.Outlook.NameSpace mapiNameSpace = myApp.GetNamespace("MAPI"); and getting following exception at second line i.e. GetNamespace Unable to cast COM object of type 'Microsoft.Office.Interop.Outlook.ApplicationClass' to interface type 'Microsoft.Office.Interop.Outlook._Application'. This operation failed because the QueryInterface

问题 A COM server is create and I registerd that. When I am trying to add that COM server in a COM Client, I was not able to add, and following error is comming. " A reference to 'COMTest' could not be added The ActiveX type Library 'c\user\~\Debug\COMTest.tlb' was exported from a .NET assembly and can not added as a reference. Add a reference to .NET instead " can anybody tell me What is the mistake. I register the COM in both way, from VS also and also tried with command prompt. 回答1: This is a

问题 I am trying to programmaticly fill in a microsoft word form. I am successfully able to do so if the string is under 255 chars with the following code below, however it says the string is too long if i try and use a string over 255 chars... How do I get past this limitation? If I open the word doc in word I can type in more than 255 chars without a problem. Does anyone know how to input more characters via c# code? object fileName = strFileName; object readOnly = false; object isVisible = true

问题 I'm trying to get my C#4.0 (VS2010) app to interact with a C++ app using COM and a referenced type library. All the examples I've seen using third-party libraries mostly include ActiveX controls or dll's where you can simply add a reference and create objects. I'm unable to create any objects directly (I get an error saying to use the interface instead) and I'm unable to find anything that will return the interface. This is a secure COM library for accessing an encrypted database and requires

问题 My C# code consumes a COM object. Sometimes that COM object methods will return E_OUTOFMEMORY but it will get translated into System.OutOfMemoryException instead of System.Runtime.InteropServices.COMException with appropriate ErrorCode . This is a problem for me because it complicates my error handling - I'd prefer to have all error indications that arise from COM object methods being thrown as System.Runtime.InteropServices.COMException only. Is it possible to always have System.Runtime