I am having a bear of a time getting this to work. The C++ prototype is #define FEXPORT __declspec (dllexport) #define FTYPE CALLBACK FEXPORT LRESULT FTYPE DeviceOpen(ULONG DeviceNum, LONG far * DeviceHandle); and the usage is like LONG DriverHandle = (LONG)NULL; DRV_DeviceOpen(0,(LONG...more >>

i need to host in place UI servers in my .net winforms app. is it possible? a code sample will be greatly appriciated. thanks Dado...more >>

Hi everybody, I'm trying to reverse an IP in c# with PInvoke and the DNSAPI instead of using the Dns class (because this later doesn't permit to deactivate the NETBT resolution, and having in mind of MX reverses and so on). The following code works perfectly, except the call to DnsRecordListFr...more >>

My VB.NET app needed to use functionality from an existing COM+ (VB6) DLL. So, I did "Add Reference" and added the COM reference. Visual Studio.NET automatically generated a DLL, "Interop.<COM-DLL-NAME>.dll" This is a console application that is part of a batch process. Everything works fine...more >>

Hi, I have the following C code generated in `test.dll': __declspec(dllexport) unsigned char __stdcall test (int i, int j) { return (unsigned char) ((i & j) == j); } In the .NET side I map it into: ..method public hidebysig static pinvokeimpl("test.dll" ansi) bool tes...more >>

Hi Gurus, I am having problem opening an excel file from vb.net. My code looks like this: Dim EXL as Excel.Application Dim wrkbook As Excel.Workbook EXL = GetObject("", "Excel.Application") EXL = CreateObject("Excel.Application") wrkbook = EXL.Workbooks.Open("D:\Book1.xls") It works fi...more >>

I am using Platform Invoke and I am trying to execute a sample VBScript using IDispatch.Invoke. However, when I call IDispatch.GetIDsOfNames I get an error Unknwon Name. Any help would be appreciated? Below is the sample code. I have implemented IDispatch interface and other interfaces in C# ...more >>

Hi In VB6 it is very easy to create out proc server in ActiveX.exe project. How to do that in .NET ? If I understood properly - there are no ways to do that in .NET It looks like by design? Thanks, Voloida. ...more >>

I have the following structure in a DLL: namespace myDLL{ public __gc class Base { public: void Method1(); }; public __gc class Child : public Base { public: void Method2(); }; } I want to expose this to COM clients and maintain binary compatibility when I ...more >>

Hi, I have a very simple windows forms application that needs to execute a method on a COM object that takes several seconds to complete. The COM object requires STA and is implemented in a DLL in-proc server. My approach is to construct a second thread, in order to execute my COM call with...more >>

Sorry for the cross post but I need an answer to this ASAP and wasn't sure which newsgroup is the most relevant since this problem covers a number of areas. Problem: How to automate Excel 2003 with C# and use the Excel Solver add-in. I've setup a spreadsheet that has a number of cells...more >>

Hey all, INVALID_HANDLE_VALUE is #DEFINE-d like so (in winbase.h): ((HANDLE)(LONG_PTR)-1) which I'm reading as -1 cast to LONG_PTR cast to HANDLE. So my C#: IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1); Am I on the right track? Tnx, Jason Langston ...more >>

Hello I've created a Test assembly below which I plan to expose as a COM object using CCW. I would like this assembly to inherit another COM object (eg myCOMobj.myClass), is this possible? If so how could I update the code below to inherit myCOMobj.myClass with a interface of myCOMobj.Im...more >>

Hi, I have a VB.NET (VS 2003, .NET 1.1) application which references Excel 2000. This generates Interop.Excel.dll. The generated .dll is invalid, so I use ildasm to generate a .il file. I change to .il file (changing some [in] to [in][out] so events work properly). I have a .snk file generat...more >>

I'm getting an IStream back from function xmlHttp.responsestream. I would like to convert this to a System.IO.Stream in order to work with it in my application. Has anyone encountered this and written a conversion? TIA, Matt ...more >>

I am migrating a VB6 COM web application to VB.Net. I have several (lets say 2) vb projects which currently compile to 2 dlls Each VB6 project references the msxml4.dll After passing each project through the MS .net migration tool I end up with a bin directory which contains interop dlls for the...more >>

Hi, I am trying to access an object from the RSView32 object model. In doing so I get the message : COM object with CLSID {0C599E91-BC23-11D0-95FC-00A024E91813} is either not valid or not registered. I have some questions : 1) Can I use regsvr32 to register this? 2) When is a COM object...more >>

I cannot find the Office.Interop.Word.dll in the New release version of Office. I developed some .Net Word applications under the Word 2003 Beta release. I did not install the release version until after the Beta expired. Now I have installed the release version, but .Net still complains that I h...more >>

Reposted from ...languages.csharp because this group seems more appropriate: Hi, My C# code is calling VB6 code, which expects all (fixed-length) strings to be padded with spaces. The strings are contained with a struct, something like this (attributes to simulate fixed-length in C# omitted...more >>

I have an assembly with a strong name. I am trying to use several Active X controls. I understand these controls need to be strong names also. What I don't understand is how to do that. I have run 'aximp c:\winnt\system32\msmask32.ocx /keyfile:"[keypath]\[keyfile].snk"' which created 2 file...more >>

I had created an Excel Add-In using .net interop. The wizard created a setup solution and the app installed with no errors. When Excel ran, the add-in loaded like it was supposed to. I fixed some minor bugs and am tryin to redeploy the app. Again, it installs with no problems but now Excel doe...more >>

Hi, I'm writing a small C# WinForms application to COM Interop with Windows Messenger (v4.7.2009). Basically the purpose of the app is to catch the messages that I receive in Windows Messenger while I'm away from the PC and forward them to my cell phone through SMS. So far so good. N...more >>

Hello everyone, I apologize for the cross and re-post, but I am still searching for an answer. Why can C++ can create this object, but C# can't? I am trying to create an instance of the default FTP asynchronous pluggable protocol adaptor, so I can analyse the traffic between urlmon.dll (I...more >>