I am going calling NetUserEnum winapi to get access to information about users on a server. I have got this working fine when it returns a USER_INFO_0 struct: [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)] public struct USER_INFO_0 { public String Username; } I am...more >>

Hi, I'm working on a migration VB.NET to C#.NET. One function scans all links of a HTML-Document to other pages. All links are available with "doc.links.item(i).href" VB.NET ------------------------------------------------------------------ Private Sub EnumerateLinks(ByVal doc As mshtm...more >>

I am using sqldmo.dll to get all SQL Server names. I have added sqldmo dll to References. It's giving QueryInterface exception. I have tried the same thing in VB, there it's working fine. Can anybody help me out in solving this problem? Below I am giving the code-- Dim obj As New SQLD...more >>

I have written an app that shows the Explorer Context Menu when a file/folder is right clicked in a ListView. I cannot get the 'Open With' and 'Send To' menu items to work. From trawling the internet it seems to me I need to implement the IContextMenu2 interface so that I can call 'Handle...more >>

I have implemented an IE toolband object in C#/Framework 1.1. All is well, except if I want to try to enable visual styles in the toolband. If I call Application.EnableVisualStyles()/Application.DoEvents(), I get a beautiful, visual styles-type interface displayed by my toolband... until IE ...more >>

hey all. i am allocating an object using Activator.CreateInstance(System.Type); I get a reference to the Com object. however, i am not sure how to close down the object that i have. do i need to call Marshal.ReleaseComObject()? will the garbage collector collect it without me calling it R...more >>

Dear All, I have a VB6.COM program using a VB6.COM DLL, which in turn uses ADODB that performs various bits of SQL. I have re-written the VB6.COM DLL in C#.NET (with a VB6 shell), which uses the ADODB.Interop library supplied with .NET. The VB6.COM program above calls this C#.NET library i...more >>

currently, i would like to enhance the features of my system, which is previously written system in c# by using several using several native DLL. however, the data structure in the DLL is rather complicated. they have several array of struct re-inside struct, struct re-inside array of struct,...more >>

Help! When I try too run "tblimp" at the command line I get the following error: 'tblimp.exe' is not recognized as an internal or external command. Where do I go from here? Thanks, Dave...more >>

Someone doing design of VB.NET decided I don't need to know the printer port any more. But I still do! It was really handy in VB6. How can I find it in VB.NET? We use print dialog to choose a printer. I want to then send RAW print to port, using WritePrinter in Win32 API. Don't know how to get...more >>

Hello, I would like to know whether it's possible to host the runtime in PocketPC, just as you do in PC. Also, are there any special issues concerning CF hosting? Thanks in advance, -- Raul Santelices A, M.Sc. Edunova S.A. | http://www.edunova.cl ...more >>

I need to write a service (or a background app) to perform a certain set of action if no keybord input or mouse movements have been made in a given time. Now, I know that vb.net can detect the such events within the form, but I need this to be system wide, since there will be no form. Is there ...more >>

I am populating a datagrid and allowing it to be exported as an excel spreadsheet but my internal customer needs the columns and rows inverted. Any help will be appreciated. Asp.Net, Office XP, Visual Studio.Net 200 Jack...more >>

Hello All, I am trying to use a (.NET ready?) dll assembly written by IBM for the Websphere product. It is called amqmdnet.dll. When I try to create a new object I receive an error message which says "A first chance exception of type 'System.Runtime.InteropServices.COMException' occurre...more >>

Hi, I've posted this on the WebService thread but had no luck so perhaps any interop experts can shed some light on this? All i'm trying to do is make a call into an unmanaged COM+ component via it's application proxy from a .NET ASP Web service. This works fine from a .Net Console app, b...more >>

Hey, can I implement IOleCommandTarget in a .net COM server? I had the idea to define the interface myself using the GUID it usually has, then implement it... is that the right way to go? Oliver Sturm -- omnibus ex nihilo ducendis sufficit unum Jabber sturm@amessage.de I...more >>

Hi Guys I am calling a simple win32 dll from a C# application. Say the function is GetLastErrorString(BSTR *pstr) the C#client calls it as [DllImport("..\\..\\..\\ClientDll\\Debug\\ClientDll.dll",EntryPoint="?GetLas tErrorString@@YAHPAPAG@Z")] static extern int GetLastErrorString(ref strin...more >>

I am using this attribute to convert a .NET object to call an automation routine that requires an IDispatch. I am able to call the automation function, but when I take a look at the incoming parameter in the C++ code, I see an IUnknown pointer type. I have made several attempts to force...more >>

Hi, different from the usual solutions, we want to substitute a C++ coded COM server with a c# application. This works so far. But the transmission of a IDispatch pointer causes a stack error. The method we want to substitute looks like: HRESULT SetIDispatch([in] IDispatch *ptr); Inside ...more >>

Hello I would use a c# dll that realize a visual control in a Delphi 5 program Can I do this How Thanks a lot ...more >>

I am having trouble deleting a worksheet using the Excel XP PIA. Here is my code: CType(excelApp.Workbooks(1).Worksheets(1), Excel.Worksheets).Delete() I have also tried: CType(excelApp.Workbooks(1).Sheets(1), Excel.Sheets).Delete() The worksheet never gets deleted. Thanks....more >>

Hello, I need to call a function in a legacy, unmanaged DLL that has the following syntax: int GetVersion(char **version); The 'version' parameter needs to be a pre-allocated string of size 250 and it will be filled by the function. The function both zero-terminate the version string as...more >>

I'm trying to build an assembly with a COM-visible type that derives from a COM-invisible type in another assembly. Here is a simplified overview of the hierarchy: support.dll ======= [ComVisible(false)] public abstract class Settings { public abstract void Read(SerializationInfo info); ...more >>

I am making interop calls to an object in a .NET component from a C++ program and am leaking memory... the following is some sample code: //////////////////////////////////////// // .NET component (Test) //////////////////////////////////////// // interface [InterfaceType(ComInterfaceType....more >>

Hi! I am trying to marshal a data structure comprising of a structure inside a structure and also an array of structures inside a structure using the default marshaler through the StructLayout machanism. However, I have not had much success and read somewhere that the best mechanism would b...more >>

Hi, I have to write a component in c#, which provides a COM interface to an existing application, for which I have a .tlb file provided which contains definition for an interface which i need to implement and expose to the COM Client, (an exisiting interface to be implemented by the .net object...more >>

How can insert an OLE object in a Windows Form? If visual basic 6.0 you could use the OLE Control to a complish the same task ...more >>

I desperately need help. I have an ASP.NET (in VB.NET) app that displays the data within the datagrid object. I need to allow for exporting of that data to the Excel spreadsheet. I have tried using Excel (referenced) object, but for some reason I can't get it to work. I get all sorts of COM er...more >>

hey all, i need to convert a bitmap into an IPictureDisp type. but i can't figure out how to do it. could someone point me in the right direction. thanks in advance -joe ...more >>

I'v been reading almost every article/post that there is about this problem, and I've made some progress in my app using Excel. But there's still one piece, at least, which I don't get. Some or both of these lines leaves Excel process in memory Dim idx As Intege For idx = 1 To ...more >>

Last night I had several thought about RAII and want to discuss a bit. Why doesn't CSharp support destructors in structs? Wouldn't that make RAII possible like in C++? When the struct goes out of scope, the dtor could be immediately be called (no GC needed). For that, you don't have to decla...more >>

Can anyone shed some light on the proper syntax for this set of lines? I am completely new to C# and am finding interop to be a bit confusing. #define FEXPORT __declspec (dllexport) #define FTYPE CALLBACK FEXPORT LRESULT FTYPE DRV_DeviceGetNumOfList(SHORT far *NumOfDevices); FEXPORT LRESUL...more >>

Hi, Can someone please look at this code and tell me why I get an exception error on the last line: For aa = 0 To ds.Tables(0).Columns.Count - 1 dbColumn = New SQLDMO.Column dbColumn.Name = "'" & ds.Tables(0).Columns(aa).Caption & "'" 'ds is the dataset dbColumn.Datatype =...more >>

Hi, I need to do a raw copy of a byte array to an Int16 array. For e.g., I have an byte array which has length 100, and I need to copy this to an Int16 array that has length 50. So 2 elements in the byte array gets copied to 1 element in the Int16 array. In VB6, this was easily done using ...more >>

Hi all, dev. env.: VS.Net2003/C# I have a windows form application with web browser control. I need to capture the onsubmit event of the forms in the document in order to get the values and log them. I have tried this: 1. this.current_page = this.mydoc.Document as mshtml.HTMLDocumen...more >>

Hello All, Just curious to know if anyone has heard if there are PIAs for VSS available? If not now, in the future? Thanks in advance! ...more >>

hi there, Is there a tool/way to generate the DllImport (and data structure) statement based on a dll we provide, in order to be able to call functions from a C# app? (advapi32.dll) Thanks, Maurizio. ...more >>

Hi All, There has been a problem with VS.NET while using mshtml interop assembly. It gives executionengineexception for the first time it is used. After the failure, second request onwards, it quietly handles all the HTML processing. Does anyone know of how to solve this problem? Your inputs a...more >>

I am attempting to use the MLang.dll in C#. I had to generate the TBL from the IDL in order to create the primary interop assembly. From some reason, this process made the arguements with char* into byte*. I manually changed these to IntPtr (native int). The main function I need is DetectInputCo...more >>

What is the best way in .NET to convert a win32 error code to a human readable message? A couple options come to mind. 1) Hard code messages for all error codes I'm interested in. 2) Find a win32 function that performs the task and call it through P/Invoke. Concerning #2, does such a funct...more >>

Just don't ask me why i need this ;-) Is it possible to create a dll in let's say C# (.NET that is) and the use it in Visual Basic??? I ran a simple test: a small Class Library project using System.Windows.Forms and one method in the main class to display a little Messagebox indicating t...more >>

Hi, Are there any examples of IXXSO use through .NET? We've tried taking our old ..asp pages forward by doing a minimal migration (removing 'set' and leaving the late bound objects as are) and are finding that this just isn't working very well - and using the indexing OleDb provider hasn't r...more >>

For performance reason, I want to replace some VB6 dll by .NET C# dll, How to call .NET dll function by VB6 dll? Thanks, FD...more >>

Hi, I've a migration scenario where I rewrite a COM object to an .NET interop assembly (so, still callable from COM). What is the impact if I continue my step-by-step migration and have a scenario where my .NET objects start to call .NET interop assemblies? Is there an overhead included? Fo...more >>

Good morning everyone, I am having a problem closing/disposing of objects created by using IBM's "amqmdnet.dll" . This dll was written for .NET by Neil Kolban & IBM. My problem is when I click the button it creates a IBM.WMQ.PCF.PCFMessageAgent class object. However ,IBM has not followed ...more >>

What are the side effects of using Marshal.ReleaseCOMObject to release COM objects? We have ASP .NET application that makes many calls to our middleware, five COM+ objects. Each time a new session is begun the RCWs are created once and cached for use though out the session, when the user qui...more >>

Is it possible to integrate Excel 2003 (Workbook/sheet) in a WinForm? What I want to achieve is dat Excel runs in a WinForm (as a control?) and not as a popup Excel Workbook/sheet. Thanks. Guy ...more >>

I have an old library that I recompiled in VC70 and made a managed wrapper for in order to use it from a C# .NET app. The problem is that the old code either a wants to post messages when it recieves information on a named pipe, or signal a CEvent. I am at a loss how to solve this problem. Rewri...more >>

I have a strange problem. When I try to call the input property of the MSXML processor object from VBScript in an ASPX page I get the error "Member not found". The same code (with a few "set" statements added) works find in ASP. What on earth is going on ? I can't find anything in the know...more >>

Hello. In my COM method i receive data with parameter of datatype VARIANT, type VT_RECORD. How to marshal resulting object to my defined data structure (class)? As i read, .net framework fo not have marshaler for this type. -- pozdwawiam, Pawe³ Janik ...more >>