I need to determine the ProductCode from msi (install file) using a .net application (web service) written in C#. I found a function in the Windows Installer SDK which seems to be what i want the function is defined as: UINT MsiOpenDatabase( LPCTSTR szDatabasePath, LPCTSTR szPersist, ...more >>

Hi, I have a vb6 active-x dll that I want to use in my vb.net program. However I'm getting the above System.InvalidCastException Query Interface faild for .....myPrintClass I admit , I've never done interop from vb6 to vs.net before except for other commercial com components ...more >>

I miserably fail using TlbImp.exe to create a .Net wrapper over a COM object. The COM object implements a coClass for an interface defined in an external ..tlb. Say I implement class A for interface IA, when running TlbImp it reports that it can't load type AClass from the assembly (there is no...more >>

How can I open a specific Excel worksheet in a webBrowser control using vb.net? I can open a workbook using this, I would like to select a specific worksheet. Dim x As frmExcelDisplay = New frmExcelDispla x.Show( x.AxExcel.Navigate("C:\mySpreadsheet.xls" Thank Gary...more >>

Hi. I try to create an OAB with LDAP and ADSI. I set all these properties: offLineABContainers offLineABServer offlineABSchedule offlineABStyle instanceType doOABVersion msExchOABFolder legacyExchangeDN - and still I only get an: System.Runtime.InteropServices.COMException (0x8007...more >>

Hello, where do I get the name of DLL that contains class implementing ITaskScheduler interface - I would like to import it into my C#. The class's ID is CLSID_CTaskScheduler Thank yo ...more >>

We have a VB.Net web application that works very well on Framework 1.0. This application uses pre-existing VC++ COM objects registered in COM+. Few months back the system administrator installed the Framework 1.1 and the application started crashing after few calls. Since we did not use any of 1.1 f...more >>

Hi, I got a problem here and would appreciate some help. I have a System.__ComObject. I would like to get/set properties of this COM object. I cast it to IDispatch, and using invoke() I'm able to get properties' values. Now I want to set a value, in order to do that, I need to set the fiel...more >>

Hi! I'm having problems with strongly named assemblies usage. There is a .NET solution with number of projects signed by public/private key pair (snk). The solution uses another package of .NET assemblies signed by another snk and deployed as msi. Now the problem. These package assemblies hav...more >>

Hi NG I've a stupid question: If a want use a .NET component as a com-interface I need to register my dll. Do the clients which uses the component need the .NET framework?? Thanks Stefan ...more >>

I have a VB.NET Class file that I created that i need to use from a VB6 component. I need to make a CCW to allow the VB6 to access the .NET component. How do I make a CCW file? In the properties of the project I have Reg as COM checked but no CCW is created. What am I missing? thx ...more >>

H I want to open an .mdb file for viewing purposes to the User The User should not be able to change anything contained in that database He should be able to only view the contents How can I achieve this For Word,Powerpoint and Excel, in the Open method itself we can specify whether the file i...more >>

Has anybody tried to use this API and if so can you point me to a working example. I am using vb.net. It is always returning 0 or a failure. ...more >>

I have a dll written in C. I call this C function from my C# code. Within the C function(in dll) it should be able to call a function in C#(Callback function). So when I call the C function I need to pass a pointer to the C# function. I use delegates within my C# code for other reasons, but coul...more >>

A number of folks have asked me about the naming convention used for the CryptoAPI unique keycontainer files (Microsoft CSP keycontainer files). These are encrypted (via DPAPI in W2k+) files holding RSA or DSA keypairs and managed by the CSPs. While these details are evidently WinOS-specific ...more >>

Hi, I working on a very simple prototype to intercept file system change messages on my Pocket PC. When I use the SHGetSpecialFolderLocation function, I get a MissingMethodException. What am I doing wrong? If anybody has sample code how to receive fife system notifiations, tat would be e...more >>

Hi all, Can someone translate this C++ to VB.NET int _tmain(int argc, _TCHAR* argv[]) { HWND hWnd = ::FindWindow("ConsoleWindowClass",NULL);//Find window HMENU hMenu = GetSystemMenu(hWnd,FALSE); DeleteMenu(hMenu,SC_CLOSE,MF_BYCOMMAND); RECT rc; ::GetWindowRect(hWnd,&rc); SetWind...more >>

I need to read the entire eventlog and parse it. The application uses vb.net and the EventLog object. The problem i'm having is that it can take less then a second up to 15 seconds to read all entries in the eventlog. I used Perfmon and found the following two counters that were used heavily ..NE...more >>

I am trying to call the WTSSetUserConfig function from VB.Net but it does not seem to work. I always get the error: "The user does not exist". But when I am using the function WTSQueryUserConfig to get the information i works ok. My code is as follows Const WTSUserConfigTerminalServerProfilePath...more >>

Hi All, I have written a VB activex dll component, which exposes a method say MethodA that takes one of the arguments as object (generic) type. The method looks like this: Public Sub MethodA(ByRef ctrl As Object, ByVal categoryID As FontCategoriesEnum, Optional ByVal resID As Long) When ...more >>

We are trying to pause a printer from C# or VB code using the Win32 printer API's in the winspool.drv. We are having varying degrees of success. With the following VB code, the OpenPrinter call works, but we get an access denied error message upon calling SetPrinter. I have auditing turned on the...more >>

We're trying to sythetically emit an object on the fly and have it work via COM Interop (we using scripting in our product). We can generate the object just fine and it even kind of works, however I need the equivalent of these attributes on the object I "Emit" and I am unable to figure out how...more >>

I'm having a strange problem and can't find a solution anywhere. I have an ActiveX control that I added to the toolbox. I then added it to the form with no problems and ran the application. Everything looked good. I then added the VC++ 6 source code as a project to my .NET solution and...more >>

I'm trying to send an array from a MFC COM client to a .NET assembly. It works fine with non-array data and with strings, but I get an error message "No such interface supported" when sending an array. Here is the C# code: namespace SpecTest { [ClassInterface(ClassInterfaceType.AutoDual)] ...more >>

Hi, I have a structure defined in a dll which has another structure array as a member. I need to call this Dll from C#. How do I do it? This is the structure I have in the DLL. typedef struct FIRST_STRUCT { double XSpeed; int DRate; unsigned int RotCtrl } FIRST_STRUCT; typedef stru...more >>

Hi all, I want to disable the x button of an old dos based program? I guess I will need a process running in the background ? thanks for any help Gerry ...more >>

I'm having problems using RasEnumConnections. [DllImport("rasapi32.dll", CharSet=CharSet.Auto)] public static extern int RasEnumConnections(ref RASCONN[] Connections, ref int dwSize, out int TotalConnections); [StructLayout(LayoutKind.Sequential, Pack=4, CharSet=CharSet.Auto)] pub...more >>

Hello. I try to read a smart card in win ce.net 4.0 with visual basic.net. I use winscard.dll, the SCardEstablishContext, SCardConnect function work fine but not SCardTransmit. I use the scr131 smart card reader and i ve got an NotSupportedException when i try to use this code. my code ...more >>

I was looking for ways to use .NET components from Perl. I found there is a Perl module for .NET from a company called Datasophy Technologies (http://www.datasophy.com). Does anyone have any experience with this module? Their descirption is attached below Thanks gzo dotNET for Perl is a...more >>

Hi I have an Acitve DLL written in VB6, now I am planning to integrate it to my VB.NET 2003 app via interop, it works OK, the question is Do I need to install VB6 runtime for the InterOp COM for the VB.NET apps separately, or VB.NET app setup project will take care of all the necessary runti...more >>

Does anyone know how tlbimp decides what version number to give to an interop assembly it is building if you don't specify one using /asmversion? I would have thought it might 'inherit' the version number from the underlying COM dll being imported, but all the interop assemblies I have built see...more >>

Hello, I have a problem and would appreciate help very much. I have an application that receives instructions from a Windows script engine. When the windows script engine passes primitive types like string & int, I can get them successfuly, however, when it passes more complex structures, I ge...more >>

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 >>