Managed C++/CLI

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Re: Attack of the covariant return types or How do you implement IList? Null_Vector14-Oct-03 5:02 Null_Vector 14-Oct-03 5:02  Oops. Change the search start date and i found a question pertaining to this already. Seems to be a problem with vs.net 2002. Attack of the covariant return types or How do you implement IList? Null_Vector14-Oct-03 4:19 Null_Vector 14-Oct-03 4:19  I'm trying to implement a collection class based on arraylist for a class library and I'm not sure how i'm supposed to get an indexer working with a covariant return type. I know covariance isn't spupporterd in mc++ but there's gotta be a way to create a custom collection......isn't there? WaitForSingleObject... raitz10-Oct-03 6:07 raitz 10-Oct-03 6:07  Hi, Is there a 'WaitForSingleObject()' similar method in managed C++ ? thanks. Re: WaitForSingleObject... Nish Nishant10-Oct-03 6:17 Nish Nishant 10-Oct-03 6:17  What exactly do you want to do? Perhaps you might want to use the Monitor class which has an Enter method or perhaps the ManualResetEvent class might be what you are looking for which has WaitOne, WaitAll methods Nish Extending MFC Applications with the .NET Framework [NW] (coming soon...) Summer Love and Some more Cricket [NW] (My first novel) Shog's review of SLASMC [NW] My photography efforts on Usefilm [NW] Come with me if you want to live This post was made from Trivandrum city, India on a 0.0001 KB/s net connection Re: WaitForSingleObject... raitz10-Oct-03 7:17 raitz 10-Oct-03 7:17  The code below is my original unmanaged C++ code: //********************************************** UINT ThreadFunction(LPVOID pParam) { DWORD dwWait; while (TRUE) { . . //do something . . dwWait = WaitForSingleObject(m_event,1000); if (dwWait == WAIT_OBJECT_0) break; } return 0; } //********************************************** I want to implement something like this. Can you help me ? Thanks in advance, Camilo. Re: WaitForSingleObject... Rod O10-Oct-03 20:58 Rod O 10-Oct-03 20:58  Looks like you want to use the ManualResetEvent/AutoResetEvent: AutoResetEvent *m_wait = new AutoResetEvent( false ); if( m_wait->WaitOne( 1000, <exit-context-true-or-false> ) ) do-this-if-wait-was-signalled; else do-this-if-timed-out; ------- For the above Wait to continue, either the time has to elapse or another thread has to execute the following code: m_wait->Set(); Check out MSDN help. Re: WaitForSingleObject... raitz15-Oct-03 10:21 raitz 15-Oct-03 10:21  thanks for your help !!! DataGrids Tom S Morton9-Oct-03 21:26 Tom S Morton 9-Oct-03 21:26  Hi Why are DataGrids in C++ .NET so slow? I am creating a dataset, and a data table with a single row, and it takes a couple of seconds to display the initial data in a datagrid, what am i doing wrong? cheers Re: DataGrids RBlyth9-Oct-03 21:54 RBlyth 9-Oct-03 21:54  I have also noticed this on the first instantiation the system runs slow and for every other after the code runs much faster... wish I could answer this one DataGrids Anonymous9-Oct-03 21:25 Anonymous 9-Oct-03 21:25  Hi Why are DataGrids in C++ .NET so slow? I am creating a dataset, and a data table with a single row, and it takes a couple of seconds to display the initial data in a datagrid, what am i doing wrong? cheers What a terrible error! How can i use &quot;union&quot; in c# Anonymous9-Oct-03 17:06 Anonymous 9-Oct-03 17:06  I am from China, so please forgive my poor English. I've got a terrible question when i try to use [FieldOffset ..] in C# to simulate the function of "union" in C. this my code: [StructLayout(LayoutKind.Explicit)] public struct union { [FieldOffset(0)] public union1 u1; [FieldOffset(0)] public union2 u2; } public struct union1 { [MarshalAs (UnmanagedType.ByValArray,SizeConst=2)] public byte[] arra1; } public struct union2 { [MarshalAs(UnmanagedType.ByValArray,SizeConst=2)] public byte[] arra2; //when I turn "byte" type to "int", it is OK! Or if i turn both "byte" to "int" in union1 and union2, it is OK too! ??? } public void testUnion() { union u; } that is , I want to make a simple union comprising two "byte" Array at the same offset, it's compiled successfully, but when i run testUnion(), i get a "System.TypeLoadException". What's more strange is that when i turn one or both of the two "byte" Array to "int" Array (or "long"), it just run Ok! Any help will be deeply appreciated! Managed C++ / Byte Array Rod Ob9-Oct-03 15:55 Rod Ob 9-Oct-03 15:55  What is the best way to get x-number of bytes of memory into a byte array and back. Basically I am trying to copy some unmanaged memory into and out of a DirectPlay NetworkPacket. I haven't found a clean (or semi-clean) solution yet. Any ideas out there? Thanks! Re: Managed C++ / Byte Array Randhir Sinha13-Oct-03 0:21 Randhir Sinha 13-Oct-03 0:21  Have you tried System.Runtime.InteropServices.Marshal ? void Copy( IntPtr source, unsigned char destination __gc[], int startIndex, int length ) and void Copy( unsigned char source __gc[], int startIndex, IntPtr destination, int length ) Subscript operator Member 6182867-Oct-03 4:47 Member 618286 7-Oct-03 4:47  Who can tell me the name of the Subscript 'operator[]' in ManagedC++? For example the standard C++ assignment operator is 'operator=', but in managed C++ it is 'op_Assign'. I tried 'op_Subscript', 'op_ArraySubscript' and some others. I need it to access arrays within a class directly (e.g. Classname[i] instead of Classname.Arrayname[i] (member) or Classname.Value(i) (function Value)) just to have a clear source code in complex matrix and vector computations. Perhaps it is not implemented (yet) in C++ .NET (just like the standard class template). Microsoft did a very bad job here! Thanks Elwin Windows forms. raitz2-Oct-03 3:05 raitz 2-Oct-03 3:05  Hi, I've created a managed C++ project, so the startup object is the 'Form1' object. My problem is that I've created a second class called 'Form2' and I want to declare a variable of type 'Form1' within this class (Form2)... Howw can I do this ? thanks. Re: Windows forms. Anonymous2-Oct-03 6:12 Anonymous 2-Oct-03 6:12  You must add the #include "Form1.h" in stadfx.h and you should work in Form2.cpp where the stdafx.h is included by default. In this way it works well!! How to use UNmanaged C++ in .NET (using managed C++) moist1-Oct-03 20:57 moist 1-Oct-03 20:57  I have been looking all over without finding any proper explanation of how to use unmanaged C++ in C# with the help of managed C++. Can anyone please give a simple step by step guide how to create the projects and show what settings to fiddle around with? (Please don't give any links to MSDN, I allready checked them out and it didn't help (sure I might be stupid but not really that stupid..)). Thank you. Re: How to use UNmanaged C++ in .NET (using managed C++) technologydude1-Oct-03 21:01 technologydude 1-Oct-03 21:01  go to the below url i have tried it and it works fine good luck. http://www.codeproject.com/csharp/unmanage.asp Re: How to use UNmanaged C++ in .NET (using managed C++) moist1-Oct-03 21:09 moist 1-Oct-03 21:09  Thank you, but I'm still looking for a proper explanation of how to write wrapper classes in managed C++ for my unmanaged C++ classes. Sorry I didn't tell in the first message. Re: How to use UNmanaged C++ in .NET (using managed C++) Nemanja Trifunovic3-Oct-03 11:30 Nemanja Trifunovic 3-Oct-03 11:30  moist wrote: how to write wrapper classes in managed C++ for my unmanaged C++ classes. Look here[^] Re: How to use UNmanaged C++ in .NET (using managed C++) moist4-Oct-03 5:41 moist 4-Oct-03 5:41  I have allready seen the so called "Migration Guide" that consists of two parts, which the first one I find completly useless. I am able to write a wrapper class, but still I wonder how you can create three different projects in a solution, one for your unmanaged c++ class that you want to wrap, a second for your managed c++ wrapper class and third a c# project that uses the wrapper class. How to do that is not included in The Migration Guide. Re: How to use UNmanaged C++ in .NET (using managed C++) Bo Hunter4-Oct-03 7:22 Bo Hunter 4-Oct-03 7:22  You mean to tell me that all this is over knowing how to add projects to a solution? Re: How to use UNmanaged C++ in .NET (using managed C++) moist4-Oct-03 18:22 moist 4-Oct-03 18:22  Yes. Let's say that you have some nice C++ classes you implemented some while ago and that you want to use them in your C# project. I can't figure out how to create a new solution from scratch and then create three different projects; one unmanaged for your old C++ classes, a managed C++ project for your wrapper and a third for your C#. I guess the main problem I have is to choose the proper settings for the unmanaged project since there are no such thing as a unmanaged C++ class library. I beleived that this was a trvial task, but I still don't know how to get it working. Thanks for the replies. Re: How to use UNmanaged C++ in .NET (using managed C++) Randhir Sinha6-Oct-03 2:42 Randhir Sinha 6-Oct-03 2:42  1. Wrap your unmanaged C/C++ code in a static library. 2. Make a Managed C++ DLL project, with all the Managed C++ wrapper classes. Link with the static library created in 1. 3. Use the DLL created in step 2, in a C# project of your choice. It will work 100%. Where to learn Managed C++.NET? Chua Wen Ching1-Oct-03 0:58 Chua Wen Ching 1-Oct-03 0:58  Hi there, I am wondering where i can learn Managed C++.NET. I had check out the msdn C++.NET specs. Very hard to learn. I had no money to buy books. And there are far too little tutorials on this area in google. Only see some like Hello World, Sortting algorithm (mostly consoles). I had no much knowledge in c++ so i can't be looking at application and learn it. Any help please? Thanks. Regards, Chua Wen Ching :p

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