Hello, I want to implement IUPnPServiceCallback in C#. This interface is not in the typelib of UPnP dll, so I must implement it myself. Are there any references to implement COM interface in C# manually? Best regards, Zhenxin Li ...more >>

Hi everyone, I think this is a fairly simple question, so I'll apologize upfront for asking this, but I'm stuck. I've created a .Net assembly that I can access from VB6 on my machine. I did the interop type library thing, all that. Works fine from my VB6 app, on my machine. ...more >>

I'm implenting an interface from ArcObjects (ESRI) where one of its methods expects are return value of S_FALSE at certain conditions. How can do this in .Net (C# specifically)? throw new COMException("", 1); The above seems to work in release mode, but when debugging the debugger halts...more >>

Hello Group, I am very new to PInvoke. I am desparately looking out for a C# structure corresponding to the C style structure. C language DLL structure typedef struct PBFNProcessDataDefinition { char cVersion[VERSION_LEN]; char cApiId[APIID_LEN]; char * cFirm; short sFirmLen; ch...more >>

Is there any way for me to find the ProgID of an Object in VB.NET which contains a COM object? For example, if in one function I do this: Dim myObj As Object myObj = CreateObject("MyCOMProject.MyClass") ....later in another function to which the myObj object has been passed, I ...more >>

Hello group, I'm writing a C# class that calls into a C style DLL. I'm trying to call a function which takes struct pointers and further these C strutures have pointers. The C# code throws an exception System.NullReferenceException: Object reference not set to an instance of an obj ect....more >>

object ActiveDocumentObject = // an instance of MS word document; System.Runtime.InteropServices.UCOMIPersistFile UCOMIPersistFile = (System.Runtime.InteropServices.UCOMIPersistFile)ActiveDocumentObject; UCOMIPersistFile.Save(DocumentPath, false); <===WORKS ActiveDocumentObject = UCOMIPersi...more >>

Hi, I wrote a simple dotnet class that I want to access from classic asp. After building the dll I registered him with regasm and included him in the gac. On my machine (Win XP service pack 2, IIS 5.1) it works perfect to access this class from classical asp. I do a CreateObject, call th...more >>

We have an ongoing problem debugging our ServicedComponent. This is a follow up to the thread entitled: "Cannot Debug Interop". Here's the situation: We have an existing VB6 Application named CAT CAT calls a series of COM objects written in VB6, I'll call this (COM OJBs) One of the COM O...more >>

Hi I'm able to load a COM DLL using LoadTypeLibEx, but what I then need to do is find out what progids are implemented within it. I'm using .NET 2.0 and C#. Thanks for any help anyone can provide. Marek ...more >>

I am moving data from an ADO.NET DataTable object in C# and I am having performance issues. QueryTables.Add, at least when called from C#, seems to spin off its own thread. So I go doing a bunch of other stuff to an invisible sheet AFTER I want the data transfer to occur, however, even afte...more >>

I'm trying to PInvoke the 'CredRead' function in Advapi32.dll. It doesn't seem to work. CredRead returns true, but the CREDENTIALS struct has flag set to 1538928. Anyone know what it means ? Is my CREDENTIALS struct incorrect ? PInvoke Signature used: ----------------------- [DllImport("...more >>

I'm working on an app that opens several Excel workbooks and imports selected data into various places. One problem I'm having is that some of these workbooks generate a dialog "This workbook contains links to other data sources." Sometimes, this dialog has Yes or No buttons asking if I want to ...more >>

I have a ASP.NET application running on a Server which does not have Outlook Installed. I want to access a Users calendar items when a button is pressed on the ASP page. However, I get the error: COM object with CLSID {0006F03A-0000-0000-C000- 000000000046} is either not valid or not reg...more >>

Hi all, I'm having a tricky problem. The thing is that i have a structure that contains a union (a structure with offset=0 for each item) and some fields of the union are fixed size strings in .NET, and I need to serialize it to a stream of bytes to send throw a namedPipe to a C App. ...more >>

Hello friends I wish to determine at runtime whether a dll file is a .Net asembly or COM. Sure, I could try and load it into an assembly object and trap the exception that results ------------------------------------------------------ Dim _Assembly As System.Reflection.Assembly ...more >>

Hi I can show a VB6 Form within my .WindosForms NET application but a can't show it as a child of my .NET mdi form. Any help will be appreciated. TIA Antonio ...more >>

I'm trying to run Excel on the server side, uploading an Excel file to the server and having it processed there. I've read elsewhere about how to configure security for this, but I'm unclear on all I need to do. The advice I've read is to use dcomcnfg.exe to grant access and execute righ...more >>

Code: Dim oXL As Excel.Application Dim oWB As Excel.Workbook oWB = oXL.Workbooks.Open("C:\data.xls") '---> Exception thrown here 'Dim ThisWorkbook As Excel.Workbook Dim ThisWorksheet As Excel.Worksheet ThisWorksheet = oWB.ActiveSheet Dim ch...more >>

Hi All, I have a question about the way marshalling executes. I am quite a newbie in C#, and wanted to use a COM function that filled a buffer with data. The COM function expected a byte pointer, and a specified size. I know, that the correct solution is to use [MarshalAs(UnmanagedType.LPAr...more >>

Hi, I have a function written in C++ that allocates a certain amount of memory, returns a handle to the memory and the size in a reference parameter: void* UnmanagedFunction(int* psize) { * psize = DetermineSizeNeeded(); void * result = Alloc(* psize); return result; ...more >>

I cannot debug unmanaged code from managed code and need help! Scenario - I have a COM Dll exposing a custom interface with a test method all written using C++ and ATL. I am calling the COM Dll from a C Sharp console application and it all "just works". Everything has been written using a...more >>

Hi, I created a simple example from the net to create a ServicedComponent. In my C# project properties, I set the property "register for COM Interop" to true. For VB.NET projects, it is a check box that I have to check. Everything works well and I can indeed call the component from an other a...more >>

Hello, I have been researching on the PIA for ADODB. I am confused. Does the PIA for ADODB only come with VS.net? If so, what is the recommended deployment strategy for making sure the PIA is on the customer machine? Does MDAC 2.7+ come with the PIA for ADODB? Thanks, Dan H. ...more >>

I need to see who has permissions in certain registry keys. I am trying to use RegGetKeySecurity but not getting very far with it. Is there an easier way to do this without going to a SDK function? Here is the code so far. It fails on the second call to RegGetKeySecurity. Imports System...more >>

Hello I have got the following code that fetches a list of NT groups from a domain controller. This works fine with Windows NT 4 domain controllers but with windows 2003 domain controllers it only fetches the first 10. On a Windows 2003 domain controller I get return code 31, on the second ...more >>

Hi, I would like to register in the COM Running Object Table (ROT) a .NET object. I would like to have a .NET process to host an instance of a class and a VB 6.0 GUI application to be able to access it. So far we have use the following APIs to publish our .NET object in the ROT: 1- Syste...more >>

Hi, First of I am a dot net newbie but have a few years experience using C++, ATL etc. The problem I am trying to solve is as follows. I have an unmanged COM DLL written in C++ with a couple of objects I am trying to call from C#. The relevent IDL in my COM DLL looks like this inter...more >>

hi, we've to develop a winform-app (.NET 1.1 / C#) , which controls a device connected to the lpt port. the producer of the device provides a set of unmanaged dlls. till now they have been used in a VC++/MFC app and worked properly. in our .NET-app the same function-calls don't return...more >>

hi, we've to develop a winform-app (.NET 1.1 / C#) , which controls a device connected to the lpt port. the producer of the device provides a set of unmanaged dlls. till now they have been used in a VC++/MFC app and worked properly. in our .NET-app the same function-calls don't return...more >>

Hi I'm wrapping a C++ dll that exposes the following function (amongst others) extern "C" __declspec(dllexport) unsigned char* __cdecl getRGBFrame(int frame) My C# wrapper looks like this: [DllImport("dgdecode.dll")] protected static extern IntPtr getRGBFrame(int frame); I can re...more >>