Hi, According to MSDN, I should be using the 64-bit compatible SetWindowsLongPtr function instead of SetWindowsLong. SetWindowsLongPtr is defined as: LONG_PTR SetWindowLongPtr(HWND hWnd, int nIndex, LONG_PTR dwNewLong ); What is the best way to call this function (and similar 6...more >>

I have an built an winforms app in C# which has IE embedded in it. I have implemented IDocHostUIHandler which does moct of what I want. The only outstanding issue I have is how do I trap script errors in the web pages. Anyone go a sample in C# or VB.net of how I can do this? Cheers Greg ...more >>

Hi I would like to use the shell function SHGetDesktopFolder from within VB.NET, but I don't know how I can use it without an implementation of the IShellFolder interface, and was wondering if anyone could point out an answer, or resources that would provide an answer Thanks in advance...more >>

Reeading the MSDN page: http://msdn.microsoft.com/library/en-us/cpguide/html/cpcondeployingapplicationforcomaccess.asp?frame=true makes me really skeptic. I thought that using regasm /tlb:blabla.tlb blabla.dll will register the assembly so as to be used by COM compliant clients. To me thi...more >>

Hi, I have a web based OLAP cube (based on the SQL 2000 resource kit version) and I need to know how to display it in a chart (web based). I know that there are 3rd party tools but I need a cheaper way to do this. Please post any code or links. You help is greatly appreciated! Thanks, ...more >>

Situation: -- VB.NET Windows app with embedded Browser control -- Browser control loads form-based text entry web app (not ours, I have no control over the HTML or the script that comes up) -- Pages of web app contain field validation via JavaScript -- Validation throws alert()'s to indicate fa...more >>

I have an extremely large (mostly VB6-based) project that makes extensive use of late-binding COM. We are attempting to migrate slowly to .NET by converting a piece at a time. I am attempting to write a replacement for one of our dlls that late-binds to COM objects. I'm using Type.InvokeMember...more >>

Hello, I'm having a problem with CCW and method parameters. Some of the parameters are classes. It seems that these classes (or at least the properties inside the class) are not seen from my VB client Do I have to declare an interface for these classes (eg. TransModes)? If yes, does anyone k...more >>

Hi - The following snippet of code: class Class1 { [DllImport("kernel32")] public static extern ulong GetPrivateProfileString([MarshalAs(UnmanagedType.LPStr)]string app, [MarshalAs(UnmanagedType.LPStr)]string key, [MarshalAs(UnmanagedType.LPStr)]string def, StringBuilder r...more >>

I have a .exe application which exposes several COM In VB 6.0 I can instantiate a class by using Set myClass = GetObject(path, progid) where path is the path on harddisk to a file (actually a .INI file in this case) and progid is the progid in registry. The .exe was not running, but was started ...more >>

I have several problems with COM Callable Wrappers implementation. Please answer any of the ones you know: 1. Can't get the ProgIdAttribute("Name") to work. I use ComClassAttribute(guid,guid,guid) for all my exposed classes so I was wondering if there is a conflict between these two Attributes...more >>

Hi, I try to call c function in C#,What is the syntax of DllImport's EntryPoint field? Why some of extern method need to point out this field while some of them do not need? In my project, A C function defination is //**************** __declspec(dllexport) SbVec2s SoWinFullVwrGetVie...more >>

Hello, I've developed a MFC based ActiveX control using VC++ 6. In the last days I've tested the control compatibility with the various language of Visual Studio.NET and it seemed to work correctly. Today I was forced to change the control version stored inside the .odl file from 7.3 to 7.4 a...more >>

I am writing an application that gets data from excel worksheets, it works fine for most workbooks but when I open some by using the following line of code: _xlApp = new Excel.ApplicationClass(); Excel.Workbook WorkBook1 = _xlApp.Workbooks.Open(FilePath,0,true, 5,"", "", true, Excel...more >>

I am try to access a remote com server from my c# app. The server has no dispatch interfaces. Is this possible? -- Howard Swope Software Engineer Spitz, Inc [http://www.spitzinc.com] ...more >>

Hi, I wrote a C# wrapper for the ReadConsole Win32API as following: (Original unmanaged signature) BOOL ReadConsole( HANDLE hConsoleInput, LPVOID lpBuffer, DWORD nNumberOfCharsToRead, LPDWORD lpNumberOfCharsRead, LPVOID lpReserved ); (Managed signature) [DllImport(KERNEL32...more >>

Hello All, I have a problem with ASP & VB 6 using an Interop Assembly . I marshal an array in VB.NET, mark it as <MarshalAsAttribute(UnmanagedType.LPArray)>, and I am able to retrieve the correct values in VB6 using Late Binding, not predefining specific datatypes for the array. But ASP seems ...more >>

Hello, I am trying to Marshal an Array consisting of custom Objects from VB.NET to VB6. The function signature in VB.NET is like the following: Public Function GetItemArrary (Byval ItemCode as String) as <MarshalAsAttribute(UnmanagedType.LPArray)> Array End Function When I use "Regasm...more >>

Has anyone tried using the Win32 low level MIDI functions in .NET/C#? What I'm trying to do is send and receive sysex-messages but I just can't figure out how to declare and use the midi* APIs. I've successfully declared and used the APIs for getting device caps and opening and sending shor...more >>

How can I expose VB.NET modules (shared classes) through a COM callable wrapper? This works with classes but not with modules: <ProgId("Loconet_caca"), ComClass("383F5F0D-ABFE-414C-B71C-E2369AA8BCCD", "BE00CB07-54ED-4322-8075-125F3F0D2EF2", "6444E0EF-91C5-4C4A-992A-3CE8325F1528")> Public ...more >>

I am trying to get a reference to an ATL COM singleton object running on a Windows CE 4.1 (w/DCOM) device from a C# client. I have no problem accessing it from a Win32 client. The code that I am using to instanciate the object is: Type t = Type.GetTypeFromCLSID(guid,"machinename",true); obj...more >>

Hi everybody, I have a customer using Win2K, MQSeries 5.2 and MQAX200.DLL from VB.NET using interop. I could get some crash dumps and see that MQAX200.DLL is raising exceptions from DLLUnregisterServer function. During analysis I could see that File Version from MQAX200 is 1.0.0.1 whe...more >>

Hello All, I am in the process of migrating the business layer of a web application into VB.NET and also implementing HTTP Binary Remoting between the Business Object Server and the Web Server (IIS) from where ASP pages call the business objects. I have a very strange problem. The ASP and ....more >>

Hi there, I have a wiered scenario. I have two structures defined this way in unmanaged dll. struct A{ char * name; int ID; }; struct B{ struct A* record; }; Then I have a function in the dll that consumes a pointer to struct B. like this. int InitRecord(st...more >>

Hi there. A method of my implementation of a COM interface takes an interface as parameter, which I never use. I could save the code for the definition of that interface, but what would be a substitute for that parameter ?? Maybe IntPtr ?? Thanks Daniel ...more >>

Hi, Does anyone know of any tutorials of using the UxTheme.dll functions from within a C# app...i seem to be having a serious 'brain fade' with this...can't draw the correct fonts etc...any help would be appreciated. Cheers Kieron ...more >>

Hi, I've been trying use the GetThemeColor function from the uxTheme.dll in a C# app...but i can't seen to get a valid result? Could someone tell me what I'm doing wrong here?? [DllImport("uxTheme.dll", EntryPoint="GetThemeColor", SetLastError=true, CharSet = CharSet.Auto, ExactSpelling = tr...more >>

Actually I want to access the IHtmlDocument2Ptr interface, but I find that I can't add mshtml.dll as a reference. Therefore I think I have to translate the COM interface(which is inside mshtml.h) to C#. But it is very complicate to translate, because it contains other inferfaces and many methods a...more >>

Hi there, I am trying to use marshal.ReallocHGlobal function. My unmanaged dll requires call back functions that the unmanaged routine can use to allocate, reallocate and free memory. For allocating and freeing memory I can use the Marshal.AllocHGlobal and Marshal.FreeHGlobal functions. ...more >>

I have .NET assemblies that are registred in COM+ as Server applications (own process). I can create and call them from C++ code with no problem. If I try to create them from .NET code, the COM+ application starts and the .NET assembly is loaded in the DLLHOST.EXE process space, but I ge...more >>

Hi, I built a Serviced Component in .Net and registered it as a COM+. Now, all [in] parameters declared as Object work just fine but the value I get inside the managed code is of type System.__comObject. From here, I'm stuck... I've searched on the Internet and I couldn't find nothing on how t...more >>

We've currently got a C++ client/server app that uses DCOM in order to make remote calls. We want to replace DCOM with a .NET Web Service. The server piece seems clear to me. I can write it using MC++ and then can call my native C++ server code from within the Web Service. What I am unsure ab...more >>

Hi all, Interesting thing happening with ASP 3.0. We are in process of migrating our old ASP 3.0 to ASPX and one of the stages is to replace the middle tier components. Now, I have created a simple COM from .Net by implementing the ServicedComponent. I defined a class inside to be used a in...more >>

Hi, I am calling "GetPrivateProfileString" function to retrieve some key/value from my ini file in C# code. I have used the DllImport Method to import the function from Kernel32.dll. For some reason, when i call this, it does not seem to work. In the same scenario , another API funct...more >>

[SUMMARY]: This is general query seeking opinions about COM+ Development wherein Server [COM+ Components] is developed in C# [as ServicedComponent] and Client accessing that across machines is also C#. Wish to seek experienced words on issues of COM-.NET interop that is playing major decisi...more >>

I am struggling to understand why Volatile fields exist in C#. The documentation states that they ensure the required order of processing.. the example given by Microsoft is : using System; using System.Threading; class Test { public static int result; public static volatile b...more >>

I have a C++ dll which returns a structure, the structure contains a char[21] variable, as shown below. struct MyCStruct { short iNumber; char Name[21]; }; I've declared a structure in C# as shown below [StructureLayout[LayoutKind.Sequential)] class MyCSharpStruct { ...more >>

Hi all, I am trying to make an API call that uses following two structures: <StructLayout(LayoutKind.Explicit)> Private Structure SECURITY_QUALITY_OF_SERVICE <FieldOffset(0)> Dim Length As Integer <FieldOffset(4)> Dim Impersonationlevel As Short <FieldOffset(6)> Dim ContextTrackingMo...more >>

Hi, I am having a VB6 application for Accounting. What advantage i can say if i convert into VB dot net ? why people convert vb6 application to vb dot net ? replyy paul...more >>

I have a COM object that allocates and passes back a pointer to an array of DATA_MAP structures. A test app written in C++ work correctly however a C# ..NET app returns garbage. In .NET the managed structure is defined as: [StructLayout(LayoutKind.Sequential)] public struct DATA_MAP { [M...more >>

Hi, Anyone knows if there are any potential errors/harms if VB5 Active EXE interop with .NET DLL? Is .NET supposed to only to interop with VB6? Thanks,...more >>

Does anybody know how to determine the Process ID associated with the resulting COM object? For example, suppose I use CreateObject to launch an instance of MS Word. How can I determine the Process ID of the resulting MS Word instance? objApp = CreateObject("Word.Application) ...more >>

How do I call a COM method that expects a VT_BOOL from C# ? (Scroll to the bottom to see my failed C# attempt to call.) // Declaration of interface for COM object [ComImport(), Guid("b722bccb-4e68-101b-a2bc-00aa00404770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interfac...more >>

Hi I want to create MDI child forms from hWnd of Dialog in Visual C++. Could you tell me how to write it. XingZheng ...more >>

Hi, I'm starting a new application that needs to host the WebBrowser control, I just wondered if there is any benefit in using version 1.1 of the framework over 1.0sp2. Any ideas about COM interop being improved, better MSHTML/WebBrowser integration into the runtime, stability improvements ...more >>

I need to create an COM componet in c#.net. First I made all steps from the Knowledge Base Article 815808 "How To: Install an Assembly into the Global Assembly Cashe in Visual C# .NET" I placed the GACDemo.dll file drag and drop into the \%SystemRoot%\Assembly\ path After that I register...more >>

I have a .Net component that I need to call from a VB6 client. I have "Register for COM Interop" checked in Project Properties...Configuration Properties... Build. The problem is that the .net component uses a setting in a congfig file, which fails when being called from the VB6 client. (I have ...more >>

I am writing an app in .NET that makes use of DataSets. Some of my clients will be writting in VB 6.0. Can I pass a .NET DataSet back to a VB 6.0 client? ...more >>

I am an interop newbie. I just received the following code as an idea to exchange XML data between Powerbuilder components via PBNI, the PB native interface and .NET assemblies. I think I said that right. Would the 'dotNetWrapper' as mentioned below just be a class that would then just say deser...more >>

Hi, I have an ActiveX component (.OCX) which I currently use in a IE browser as an embedded object. Now, I need to write a C#.NET wrapper to this OCX so that I can use the OCX in a stand alone application too. I tried a test C# console application to achieve this. In my .NET project I added refe...more >>