In VC++, I have to hardcoded the .net dll's ClassId if i want to create the com instance. How can i get the .net COM's classID without having to create the instance first ? --------------------------------------- #import "Sample.tlb" using namespace Sample; //******NOTE****** const IID CLSI...more >>

I feel rather confuse with the RefreshCache method. Let say I call the method using the following code, DirectoryEntry entry = new DirectoryEntry(); entry.Path = path; entry.Username = userName; entry.Password = password; entry.AuthenticationType = AuthenticationType.None; entry.RefreshCa...more >>

I've an interface with the following method: void Show( [In, MarshalAs(UnmanagedType.I4)] int fShow); void UIActivate( [In, MarshalAs(UnmanagedType.I4)] int fUIActivate); When I call these methods, using this cocde in C#: interopDocumentView.Show(-1); interopDocumentView...more >>

Anyone know how I can get a Win32 HANDLE from a StreamReader or StreamWriter? I want to work with some I/O using Win32 APIs, but I would like to attach the I/O to a .NET Stream class. Any suggestions? Thanks Shawn ...more >>

I am experiencing what appears to be a security problem when attempting to save file attachments from MailItems in the default inbox of Outlook (have tried both 2000 and 2002 SP-1). the messages have been filtered to only save .txt attachments and I use the following code to attempt the save (myP...more >>

Hi, Are there any problems with using CoRegisterClassObject/ROT in .NET/CLR to expose an object as IDispatch for communication from/to unmanaged world? It is registered from MTAThread. The DllImport is as follows: [DllImport ("ole32.dll")] static extern uint CoRegisterClassObject (ref Guid ...more >>

I've read the KB articles that indicate that there is no OLE container for managed code. It doesn't seem to me that this is rocket science, so I have to think that someone has written one out there. If not, then I will write one myself. What I am trying to do is to implement Excel in-place-...more >>

Hello, I have a C# application which creates two C++ COMs, and then pass one to another. the code snippet as follows: COM1 and COM2 are two COMs implemented in ATL. in C#: COM1.CCOM1Class com1 = new COM1.CCOM1Class (); COM2.CCOM2Class com2 = new COM2.CCOM2Class (); .... ... (1) com1....more >>

Hello World, Using (unmanaged) C++ only, I'd like to be able to read and interpret a binary stream coming from a .net object standard serialization. For example, let's assume I have a .net client which serializes some "POD" objects (structs with public fields) using the standard .net serializ...more >>

Hi all, This is a repost from some other groups - I've been recommended to ask here. I need to use/upgrade the undocumented API's for NTDLL.dll - namely NtOpenSection, NtMapViewOfSection, NtUnmapViewOfSection, CloseHandle and CopyMemory. Code listing 1 shows the existing VB6 code, which works ...more >>

Hi NG, I have a c#-classlibrary that I registered as COM-Object. A TLB is created by this approach. But what I really need is a c#-dll that I can use as COM-dll. We have a VC++ 6.0 Application that loads COM-dlls as PlugIns. But this app can't use Typelibs. Therefore I need the c#-dll that I c...more >>

I need to use OleSetClipboard in my VB.NET application. Unfortunately, when I do the result returned is -2147221008 (CoInitialise has not been called). As I am using OleSetClipboard from a thread I've created, I was under the impression that .NET automatically called CoInitialise the first time ...more >>

Hi, We try callback C# method from C++ DLL using delegate, using delegate without argument works fine for me however the CallBackFunctionWithParameter which call delegate with parameter crash the application after being called . Any suggestion will help and really appreaciated Thanks ...more >>

Hello, I've developed an object that late binds to COM objects using Activator.CreateInstance and <Type>.InvokeMethod. The object is held within a ASP.NET application which is used heavily, thus requiring the late binding to be activated regularly. Unfortunately, on more than once occasion...more >>

I am trying to get the BIT_BUCKET (recycle bin) folder from SHGetSpecialFolderPath, but it always returns empty. <code> [System.Runtime.InteropServices.DllImport("Shell32.dll")] private static extern bool SHGetSpecialFolderPath(IntPtr hwndOwner, StringBuilder lpszPath, int nFolder, bool fCr...more >>

Hi, I am using ADODB with our .NET application and it has been working fine. I recently upgraded another server from W2K to 2003 and during the installation, it has asked to upgrade to the 1.1.4322 version of the .NET framework. After the installation, I installed the adodb PIA in the GAC and tr...more >>

I was using a third party COM componenet for my application. Now since we are porting our application to .Net, I am created a RCW using tlbImp.exe for the com dll. When trying to use the methods of the COM wrapper dll in .Net, some of the methods that were originally present in the COM dll are no...more >>

Dear All, I am trying to add ObjectPooling in my program... <ObjectPooling(MinPoolSize := 2, MaxPoolSize := 5, ConnectionTimeOut := 20000)> <Transaction(TransactionOption.Required)> Public Class Class1 ......... End Class But my compiler is saying "Attribute Specifier is not in a comple...more >>

Hi, I have developed an application which uses several COM components developed in Visual Basic 6.0. Now I have developed a .NET COM Component in VB.NET. When I try to access the newly created .NET component in my previous COM component. It is throwing an exception "Invalid Assembly". Can any on...more >>

Hello, I have a C++ com server and C# application. C# application creates the Com and asks it to do some job. After the COM finishes the task, the COM will raise an event. C# event handler will do the following processing. so far so good, but if C# application asks the same COM instance to do...more >>

Hello, I have tried and failed to pass a struct from a C++ COM to a C# application. Is anybody have any idea or point to some documentation? Thanks in advance. Steven Wang...more >>

I have a class that has methods like: [DllImport("wfdb.dll")] private static extern int setsampfreq(double freq); The wfdb.dll file isn't in the current directory nor on the path ... so I want to qualify it with the path name, for example: [DllImport(@"c:\foo\wfdb.dll")] Ho...more >>

Hi, First my conclusion (I hope someone can tell me I'm wrong) followed by a problem description. CONCLUSION: When an activex control is used in any .NET application and the control uses events to continuously pass data to the .NET application the result is that memory is allocated b...more >>

I have a 3rd-party DLL (unmanaged C++) with a method in it that wants a 'void *' to a callback method. I am not privy to the source code (just have the DLL). I am writing a C# app that uses this method. Unfortunately, even though I have created a 'delegate' for the callback method I cannot f...more >>

Hi, I have a LIB file that contains several functions written in C. How can I use this functions from C# in managed code? Thanks, Jeronimo...more >>

using System; using System.IO; using Microsoft.CSharp; using System.CodeDom.Compiler; using System.Reflection; namespace CodeCreationAndCompiling { public class Class1 { public VerySimple [] ReturnArrayClass() { VerySimple a1 =new VerySimple(); VerySimple b =...more >>