I have a C# web application that is "passing parameters" to a DLL via environment variables (that is how the DLL was written to receive arguments). The problem is that the DLL seems to be taking the first set of environment variables I set in my C# code and saving them. Subsequent calls to the D...more >>

Hi I'm trying to call LSALookupNames2 from C# and get a NullReferenceException. I assume that I made a mistake declaring LSALookupNames2 or LSA_UNICODE_STRING The LSAOpenPolicy and LSAFreeMemory calls work fine (I got most of the code from another post to this newsgroup) Can anyone tell ...more >>

I need to work with an unmanaged DLL for a socket based wireless communication API. I'm wrapping it with a combination of unmanaged and managed C++ calls and running everything in a .NET Windows Service. When it receives a message over the network, it posts a WM_SOCKET_STATUS message that I ha...more >>

Hello there, The following code causes "Specified cast is not valid" exception when line 3 executes inside an ASP.NET application. I have tried this with several components. Exactly the same code works if connecting locally (i.e with localhost) and it always works from a Windows Forms applic...more >>

Hello every one..... i have a windows application an i am trying to get some data from SQL Server and export them to Excel. I am using Windows 2000 and Excel XP. i followed the instructions from MSDN but i get the following error message "Old format or invalid type library" The example code...more >>

I have created a C# component and successfully converted it into tlb file. Is it anyway to debug my C# component when calling it from my VC++ application without opening VC++ project from .net ide? Thanks. Linda chen...more >>

Hi All, I have a web site that makes calls to components hosted in COM+. Recently we started seeing some out of memory errors on the web site. On further analysis we found that the number of open handles on a COM+ package keeps going up and the memory used by aspnet_wp goes up. However, t...more >>

The following code starts an application for automation in VB: Dim IMFAObj As Object Set IMFAObj = CreateObject("Famas2000.Application") The VB.NET code is as follows: Dim IMFAObj As Object IMFAObj = CreateObject("Famas2000.Application") The VB.NET code starts the applica...more >>

Hi, Introduction *************** I have a system build of a collection of 'Native COM objects' and '.NET = COM interop' objects, all of the COM objects are managed through a = 'Native COM' layer, this layer manage the underlying COM Objects and = upon request, provide a pointer to those obje...more >>

I would like to import some Excel data and are using Excel 2003 on my development system. The workstations using this application have Excel 2000 installed. Because of this the Excel 11.0 object reference is not working on the workstations. I tried to include the Excel 9.0 object library b...more >>

how do I pass the specific error code to vb6 via COM Interop? throw new COMException("SayA error", 9000); does not work for me, there is even no error raised in the vb6 com client... ?? please help -Jim "using System; using System.Runtime.InteropServices; namespace aa { ///...more >>

Hi I open a word document from my vb.net app. Now I want to pass reference to one of the classes in my vb.net app to word so it can access procedures in the vb.net class. How can I pass the class reference to word from a vb.net app? Thanks Regards ...more >>

Hi How can I do this from within a vb.net app; 1. Create a word document from a word template and, 2 Pass a value to a variable defined within the document's VBA module? Thanks Regards ...more >>

Hi Is it possible to add a com class to a vb.net exe app so other com apps can interact with the vb.net app? Thanks Regards ...more >>

Hi How can I expose procedures (function or sub) in my vb.net app to vba in word? Thanks Regards ...more >>

Hi I am opening word from my vb.net app. Is there a way to call a procedure in the vb.net app from a word macro? Thanks Regards ...more >>

Hello, i am trying to use a com component in an ASP.NET application. But it gives me an error as follwos: "System.Runtime.InteropServices.COMException: Object variable or With block variable not set" i used the COM file thru ASP and that worked very well. but the same file i cannot access ...more >>

Hello, Is there anyone who has worked on Registration Free COM Interop? I am looking at communicating with a COM Component from a .NET application without registering it. Thank you, Prem ...more >>

Hi, I have developed the a class in C# using .Net framework 1.0 SDK which is derived from ServiceCompnonent. This class is hosted in IIS 6.0 and OS is Windows 2000 profesional. Some time when server is too busy I got an exception that "The run-time environment has detected an inconsistency in ...more >>

Hi, I have a problem using an COM-Object from Access (tested with Office 2000 and XP). The VB Code calls a function in an C# dll via COM Wrapper. This function opens a Dialog and returns 3 values. The same Code works fine when called from a EXCEL Sheet-VB. In Access VB a Error "wrong Par...more >>

How can i accomplish this? I want to be able to put a DLL of mine in the GAC(It must have a STRONG name) but the following command is not working: ilasm "my_il_file.il" /DLL I already tried to: ilasm "my_il_file.il" /DLL /KEY="key_file.txt" but it still didn't work Could anyone enlighten ...more >>

Hy I have a litle problem : I have to invoke a function in an unmanaged dll (writen in C) from C# ------------------------------------------------ int string_modify(unsigned char* myparameter) -------------------------------------------------- how to declare this function in C# ? I tr...more >>

I have one function I'd like to call in this old dll. I believe I am calling it correctly, because of the errors I am getting, but it is not working. The funtion takes these arguments: Inputs: NOPRT - CHAR*1 L - Integer MILGRD - Char*(*) ISQR - Integer Outputs: XLAT - D. Prec....more >>

Ok... I know I'm coming up with some weird stuff... but this is needed in order in order to call some tessellation functions in the OpenGL Util library (glu32.dll). Several of the fuctions in the library take a void*, which is then passed back through a callback which the library calls later o...more >>

Hi all, Is there any good tutorial talking about Marshal and DllImport matters? Please suggest. Thx. Peter http://www.infopx.com ...more >>

Majority of COM interface functions return HRESULT. What is the correct way to map it in C# project? void, or int/uint? I am asking because I just saw a sample in some respectful source which performs mapping as void. Is it possible to map as int/uint, or the .NET framework will perform some p...more >>

Hi, I have been trown into the "beutiful" world of .net vs unmanaged code.. (phu!) And I really needs some help... (with my english too... Another story, another posting.. :o)) It is years since I did som C++/C coding, and now I can't make som clue between some .net code and som old .dll to w...more >>

Hi all, I don't know how to convert the vc++ enum to c$ enum. e.g. here is part of the code in the vc++ header file: typedef struct { RECT rect; enum STYLE style; } IMGRGN; enum STYLE{ HOR_TEXT, //Horizontal text zone VER_TEXT, //Vertical text zone ENG_TEXT, //English zone in...more >>

Hi, all I have the following questions about printing in C# 1. How to print a document (e.g. MS Word, Excel, PDF) through C#? I have use PrintDocument and set the DocumentName to the file path (e.g. @"C:\Test.doc"). But I can't print out the content in the document...Why? So how can it print ...more >>

I have written a C# .NET application that uses Decision Support Object Type library 5.1 to access an analysis server. The problem is that when the application ends (and all processes complete normally), I get a fatal error: "The instruction at 0x.. referenced memory at 0x... The memory coul...more >>

Hi all, I've been struggling with a problem for some time today, and I'm hoping someone else can spot the obvious thing I'm doing wrong. 1. I have a .NET DLL (written in C#) which uses some other third party assemblies. This DLL is in the same directory as the assemblies it uses. 2. I ha...more >>

Hi everyone, I'm stumped. I'm building a "robot" application that operates on a System.Timer, checking a queue table in a SQL Server database and operating on the items in the queue, processing the input in Excel and then writing to another table and creating some graphics files (Excel charts...more >>

Hi I would like to have my app as an executable but I would also like other apps to use objects within my app bit like the old ActiveX EXE. What do I need to do in my vb.net app to achieve this? Thanks Regards ...more >>

Hi I'm new to distributed programming and I have a question concerning interoperability between two applications. I created a .net windows application that has to communicate with an existing application, implemented in an older technology, that doesn't directly support .net components. It is...more >>

I have a C# Application test program, an unmanaged C++ dll, and a unmanaged exe application. C# app calls the C++ dll, and the C++ dll will launch the unmanaged exe program. The unmanaged exe program will read/write temporary files when executing. AFter the unmanaged exe program done the process...more >>

Hi there, please help on such a simple asp.net page. 1. My vb DLL has only one class called "test" with one funtion "display" which returns string "Hello" 2. After register this DLL, I added referece to the asp.net project and called it as following. (Such a simple thing but error says Que...more >>

Ok... I know that the DEVMODE structure has been covered a ton in here... but I have yet to see this particular question answered. Here is my definition of DEVMODE... notice that I've commented out the parts that are in a union... since I can't seem to have overlapping FieldOffsets without the...more >>

I am bumping into lack of documentation for the topic - maybe I am not looking where I should. I need to manage a bidirectional communication between two applications. One of them is a package that reads from Stdin and named pipes appear to be the only solution to redirect and automate i...more >>

I want use Microsoft Office Document Imaging control in the VB.NET application . I added this control to Visual Studion.NET tollbox and used it in my program. This program work coorect in my comuter, but it don't work in other computer, because first must install activex control for this c...more >>

Hello there, Has anyone successfully returned a .NET array to JavaScript running in MSIE? I have implemented a browser that hosts WebBrowser control, and I'd like to expose a .NET array through window.external. I tried MarshalAs(UnmanagedType.SafeArray) and then used VBArray() in JavaScript...more >>

Can anyone point me to an actual example of this method being used in C#? I'm trying to enumerate the ROT and expose every instance of an ActiveX server rather than using GetActiveObject, as that only returns a reference to the first instance of that server. -- There are 10 kinds of people. ...more >>

Hi, I have a created a function in C# which I want to handle an Err object from VB 6.0 (don't ask why ;-)). For example: The VB 6.0 code: On Error Resume Next Dim lObj As MyAssembly.MyClass Set lObj = New MyAssembly.MyClass err.Raise 50000, "Source", "Description" ...more >>

Hi The problem that I am facing is that I have created a .net Component wrapped up CCW, so that existing COM clients can call this component, and they dont break, but whenever I build the component, It gets a new CLSID, how do I stop this, and force it to use the same CLSID every time, I don...more >>

Dear All, I have to move my VB code to C#. But I have no idea on the GetObject method in Vb. ----------------------------------------- Set dom = GetObject("WinNT://" & domain) ----------------------------------------- This is easy for VB to get the object by COM monikor interface. How...more >>

Anyone have any class definitions etc. for TAPI integration in .net? What I'm specifically trying to do, is take a phone number and have it format correctly according to location. Outlook does this with TAPI and I'm hoping to do something similar... Thanks! James Hancock ...more >>

hi all. please help me translate the following method: HRESULT ICaptureGraphBuilder2::FindPin( IUnknown *pSource, PIN_DIRECTION pindir, const GUID *pCategory, const GUID *pType, BOOL fUnconnected, int num, IPin **ppPin ); this is what i tried (it crashes) [Preserv...more >>

I wrote the following code in a ASP.Net page: DirectoryEntry objDE; string strPath="LDAP://DC=cna,DC=com"; // Create a new DirectoryEntry with the given path. objDE=new DirectoryEntry(strPath); foreach(DirectoryEntry objChildDE in objDE.Children) Response.Write(objChildDE.Path); When I...more >>

Hi all, I can't work out why this doesn't work - any ideas? I have tried absolutely everything I can think of and have read as much material on the net as I can find. I am stumped - HELP! The problem is marshalling the string back into managed code - lvi.pszText. It is either empty or contain...more >>

I'm trying to use a C dll provided by our vendor which has structure definition typedefstruct tag FCSDKSTRUCT{ WORD funcno; char foldername[11]; WORD totalindex; char indextitle[12][31]; char indexvalue[12][31]; WORD autonext; char errormsg[80]; } FCSDKSTRUCT; //proto...more >>

Hi, When an overloaded procedure is exported it has a suffix of an underscore followed by a number. I would like to know if there is a way to control how overloaded procedures are exported from .NET to COM. TIA ...more >>