Hello Mattias, I have a related question, this time on NetScheduleJobEnum API. I get a null reference exception (even though the api call correctly set EntriesRead and TotalEntries params). Thanks again! [DllImport("netapi32.dll", CharSet=CharSet.Unicode) static extern uint NetScheduleJobEnu...more >>

Hi All, Environment: Windows XP; Visual Studio .NET 2003 Edition Problem: Calling CreateProcess Function from a Windows Service Ultimate Aim: To print a pdf file using the command AcroRd32.exe /t "c:\myfile.pdf" "\\PRINTERS\printer1" from a Windows Service Program I need to call th...more >>

Please help with syntax importing an API into .NET, below is the signature. I am having trouble with specifying and passing parameters. Thanks NetScheduleJobAdd LPCWSTR Servername, LPBYTE Buffer, LPDWORD JobId ) ...more >>

Hi I have a User Control which has TabControl with 2 pages. I have DateTimePicker Control on one of the TabPages, whenever the Calendar is opened to change the dates it hangs. This happens when my calling program is an MFC program(unmanaged). But if the DateTimePicker is on the usercontro...more >>

Hi, I have been trying to get at the WordBasic.DisableAutoMacros method with C#. WordBasic is passed as a _ComObject so I can't call this directly. I have tried: Type t = Type.GetTypeFromProgID("Word.Application.10"); object MSWord = Activator.CreateInstance(t); object WordBasic = MS...more >>

I am trying to access a managed com object created in VC6. I have created a ASP.Net form and have added a COM Reference to the project. This creates a interop.xxx.dll for the project. When I run the form I recieve an exception: InvalidCastException: QueryInterface for interface ... xxx. ... fail...more >>

When we try and install our COM+ components using a client proxy from our Windows 2003 machine onto our XP machines we always get an error during installation on the client machine (see below). Now if we select the option "Save COM+ Component in 1.0 format..." when creating the client side proxy in...more >>

He I have made a interop assemby with VS 2003 on a COM dll I have the following problem A Sub in the COM dll has the following signature Sub Assign(ByVal FieldData As Variant VS generates the following method public void Assign(ref object FieldData The variant can be several different ty...more >>

Hello I am trying to import a dll from within a webservice. At the call of the dll function, a DllNotFoundException exception is thrown. I have tried to putting the dll in the web service directory, putting the dll in the system32 directory, specifying the full path for the DllImport function. I a...more >>

Hi all Could some-one please tell me what the equivilent .NET code is for the CopyMemory API call? This is my vb6 code (some code ommitted): ------------------------------------- Private Structure FILE_INFO_3 Dim fi3_id As Integer Dim fi3_permissions As Integer Dim fi3_num_locks As...more >>

This is of huge interest to this group.... The main man of Interop, Adam Nathan, has put together a Wiki for Win32 P/Invoke signtaures. This is a valuable contribution to the Interop community. http://pinvoke.net/ PINVOKE.NET attempts to address the difficulty of calling Win32 or other unman...more >>

Hi, We currently have a legacy VB6 app which we want to gradually convert into VB.Net. We have been told its better to make calls from .Net to COM than vice versa, so the intention is to start by rewriting the screens in the order in which they are called, gradually shifting them from VB6 into...more >>

Hi everyone We are trying to access a remote COM object in our asp.net application and are running into difficulties. We keep receiving the error: QueryInterface for interface "dll.className" failed. This error occurred when we deployed the application to our test servers. During our development c...more >>

When trying to free memory allocated with Marshal.AllocHGlobal, I get the message "The object is currently in use elsewhere Any idea why or how I can fix this? Sample code below int bufferSize = GetGlyphOutline(hdc, (int)c, (int)METRICSFORMAT.GGO_NATIVE, out metrics, 0, IntPtr.Zero, matrix) I...more >>

Hello all, i am having a problem with a dll vb6 file. i'm programing a = nt service using vb.net with visual studio.net. The problem be when i use the final service, because when i debug it, = all works fine. But when i run the service in the service manager never, = execute a vb6 dll method. S...more >>

I am needing to write a socket server in c# that will essentially dupe each socket handle from the process that receives the connections to separate processes that will handle each connection from that point on (one process per connection). This is so that if the process handling one of the connecti...more >>

I'm currently porting a working VB6 application in Visual c# but I'm having big troubles converting this external function call to a Fortran DLL. I think the problem is about passing arrays by reference as arguments. The VB6 version is Declare Sub CALC Lib "CALC32.DLL" (ByRef V1 As Single,...more >>

Hi, I am having a strange problem when trying to register .NET DLL to COM+. I am using .NET framework 1.1. The DLL I created works fine through ASP.NET pages when I import the Class. But I want to register it under COM+ Services. I did the following: 1) Assigned Strong Name 2) I ad...more >>

Hello I'm working on a .NET C# user control to use it in Windows Forms Applications. This User Control uses a COM Library via RCW. I would like to use the control also through a web page with <OBJECT> tag accessing via IE, in a similar way of old ActiveX Controls The point is that if I call the .h...more >>

Hello, My problem is two fold. 1) I must support a deployed legacy application written in VB6 SP5. I need to export data from a database, compress it and the encrypt the data using 3DES (to prevent tampering) data gets transmitted at night to the home office of my company. Rewriting th...more >>

Hi, Can anyone help? Although PRNADMIN.DLL was meant to be used by scripting however, due to certain requirements, I had to use it in my vb.net project as a COM interop. When enumerating the Printers using PrintMaster, everything's ok. Problem appears for enumerating Drivers/Forms/Ports. ...more >>

I got the following signature from the E appendix of Adam Nathan's ".NET and COM...Interoperability Guide". --------------------------------------------------------- [DllImport("user32.dll")] private static extern IntPtr SetWindowsHookEx ( int idHook, HookDel...more >>

See the code below. I only get the first messagebox. Private Sub AxWebBrowser1_DocumentComplete(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_DocumentCompleteEvent) Handles AxWebBrowser1.DocumentComplete Dim doc As mshtml.IHTMLDocument2 doc = Me.AxWebBr...more >>

Additional information: QueryInterface for interface Outlook._Application failed. I'm running: golApp = new Outlook.ApplicationClass(); gnspNameSpace = golApp.GetNamespace("MAPI"); on Windows XP with Outlook 2002. I've completed the steps described by KB Q309336 and downloaded the Offi...more >>

Dear all, I set up an shared-add-in for Excel (2003) in Visual Studio (as well 2003 using c#). This works quite nice as well as putting in place menu structure or using forms. But I am a little bit stuck with a "range selector". Selecting several ranges in sheets out of a form would be nice...more >>

Having asked a question recently about casting a byte buffer to a struct and receiving an excellent response from Mattias Sjorgen (sorry about that o ;) which resulted in the following code struct rec01 ushort rt .. byte[] buffer = new byte[512] rec01 rec // fill buffer with dat un...more >>

Not sure where to post this Q I am trying to write a Managed Exchange Server Event Sink (as a class library) in C# I have been following this tutorial step-by-step http://www.codeproject.com/csharp/CsManagedEventSinksHooks.as So far so good....except when it comes down to binding the compone...more >>

Hello! We are considering the purchase of some ASP components for a asp.net project. Our knowledge of Interop is very short. Vendor says that their components "are COM objects, not native .NET components, but using COM Interop assemblies you can certainly use them in a .NET environment." Ques...more >>

Hi guys, I'm trying to call a method on this COM Object. I have an example on how to do this in VB6. However, I kept getting Type Mismatch Exception when trying this in vb.net. Here is the method signature : BOOL QryMessage(short MsgIndex, BSTR FAR* MsgText, BSTR FAR* MsgDetail, short FAR...more >>

I'm trying to handle when my app opens Excel and the user closes it instead of my app. Excel will remain in memory until a reboot. To demonstrate, create a CSharp WinForms app with one button. Here is the button click code: private void button1_Click(object sender, System.EventArgs e) { /...more >>

(Type your message here) How can I dynamically load a unmanaged dll in C#=2E Is it using= DllImport? As in VC, can I use the LoadLibrary() directly? I have an unmanaged C++ DLL which exports certain classes=2E I want= to access these classes from the C# client=2E I was able to do so= by mo...more >>