VC.Net, managed c++ vs unmanaged c++

managed c++ vs unmanaged c++

Author	Message
Felix Wu( #1 / 11	managed c++ vs unmanaged c++ Hi Muhammad, You can use unmanaged C++ classes in Managed C++, but not in C#. In C#, you can use Platform Invoke (DllImport) to call functions exported from a Win32 Dlls, but are not able to instantiate a regular C++ class. To workaround this scenario, you can either create a COM wrapper around your class, and then import it to .NET via COM InterOp, or use Managed C++ to wrap the class. To use managed classes in unmanaged applications, you need to use COM InterOp to export the classes. Also, notice that you should consider the requirements of COM interop at design time. Managed types (class, interface, struct, and enum) seamlessly integrate with COM types when you adhere to the following guidelines: 1. Classes should implement interfaces explicitly 2. Managed types must be public. 3. Methods, properties, fields, and events must be public. 4. Types must have a public default constructor to be activated from COM. 5. Types cannot be abstract. For more information about the guidelines, please refer to this article: Qualifying .NET Types for Interoperation http://www.--*.com/ forinteroperation.asp Hope this helps. Regards, Felix Wu ============= This posting is provided "AS IS" with no warranties, and confers no rights. -------------------- Quote: >Subject: managed c++ vs unmanaged c++ >Date: Tue, 3 Sep 2002 14:10:33 +0500 >Lines: 14 >X-Priority: 3 >X-MSMail-Priority: Normal >X-Newsreader: Microsoft Outlook Express 6.00.2600.0000 >X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 >Newsgroups: microsoft.public.dotnet.faqs,microsoft.public.dotnet.framework,microsoft.pub lic.dotnet.framework.interop,microsoft.public.dotnet.framework.sdk,microsoft public.dotnet.languages.vc Quote: >NNTP-Posting-Host: 202.163.100.130 >Path: cpmsftngxa10!tkmsftngp01!tkmsftngp08 >Xref: cpmsftngxa10 microsoft.public.dotnet.framework:25356 microsoft.public.dotnet.framework.interop:8225 microsoft.public.dotnet.framework.sdk:4448 microsoft.public.dotnet.languages.vc:14274 microsoft.public.dotnet.faqs:7266 Quote: >X-Tomcat-NG: microsoft.public.dotnet.languages.vc >If someone could help me with the following queries it will be highly >appreciated ! please contact me on my email if some one is interested to >provide help >1) What is the role of STL in Managed world? >2) Can we use Unmanaged Libraries ( Dll's / C++ classes / C++ classes >encapsulated in dlls ) in Managed Applications? (and vice versa) if yes is >there any complete example available ?!
Mon, 28 Feb 2005 10:19:02 GMT

Jochen Kalmbac #2 / 11	managed c++ vs unmanaged c++ Hi, it would be good if you change your name from to like other people from MS... Then more newsreader are able to display your name correctly... XNews displays it only as "MS)" -- Greetings Jochen
Mon, 28 Feb 2005 13:51:43 GMT

Felix Wu [M #3 / 11	managed c++ vs unmanaged c++ Yep, it seems better now. Thank you so much, Jochen! Regards, Felix Wu ============= This posting is provided "AS IS" with no warranties, and confers no rights. -------------------- Quote: >Subject: OT: Name... >User-Agent: Xnews/5.04.25 >X-Face: #TA[Jae"bdx-+QGJx=d8Gi"CujilO8C4^r,6rco%?.Xk?;y`M?j&$Pmm>%[c!9kDW7m]C~N bWutCC$vPTUW-"icn`nX:[F"N;mB9}]ABU?Y]tZwmSP{]! Quote: >Newsgroups: microsoft.public.dotnet.languages.vc >Date: Wed, 11 Sep 2002 22:51:43 -0700 >NNTP-Posting-Host: 194.196.235.43 >Lines: 1 >Path: cpmsftngxa08!tkmsftngp01!tkmsftngp10 >Xref: cpmsftngxa08 microsoft.public.dotnet.languages.vc:14120 >X-Tomcat-NG: microsoft.public.dotnet.languages.vc >Hi, >it would be good if you change your name from >to >like other people from MS... >Then more newsreader are able to display your name correctly... >XNews displays it only as "MS)" >-- >Greetings > Jochen
Mon, 28 Feb 2005 22:01:49 GMT

Philip Taylor[MS #4 / 11	managed c++ vs unmanaged c++ Quote: > If someone could help me with the following queries it will be highly > appreciated ! please contact me on my email if some one is interested to > provide help > 1) What is the role of STL in Managed world? C++ Users Journals recent issue just had an article about mixing STL and managed C++. Quote: > 2) Can we use Unmanaged Libraries ( Dll's / C++ classes / C++ classes > encapsulated in dlls ) in Managed Applications? (and vice versa) if yes is > there any complete example available ?!
Tue, 01 Mar 2005 02:35:56 GMT

Richard Grimes [MVP #5 / 11	managed c++ vs unmanaged c++ Don't cross post, its not good manners. Quote: > 1) What is the role of STL in Managed world? It is used for templated containers for unmanaged types. Quote: > 2) Can we use Unmanaged Libraries ( Dll's / C++ classes / C++ classes > encapsulated in dlls ) in Managed Applications? (and vice versa) if yes is > there any complete example available ?! Yes, managed C++ comes with a technology called It Just Works (called that because it does). You don't have to do anything to use IJW other than use an unmanaged static library, or call an exported DLL function. Using managed types in unmanaged applications is a little more involved. There are two ways to do this, the easiest way is to use regasm to register the .NET assembly as a COM server and then use tlbexp to export the metadata as a type library and use #import in your native C++ application so that you can call the classes. The downside of this is that the .NET must be in the GAC or you must use /codebase with regasm which 'fixes' the assembly to one location on your hard disk. The other way that you can call .NET classes from unmanaged C++ is to use the hosting interfaces. In affect you explicitly load the CLR into your process, creating an AppDomain where you can call .NET classes to load types and execute them. The downside of this is that it is extremely tedious because many of the .NET classes have overloaded methods, and .NET distinguishes between them using numerical suffixes, and as far as I can tell there is no obvious way to tell which overload corresponds to which suffix. Furthermore, most of the framework classes are exported through COM as automation interfaces rather than dual interfaces (there are good reasons for this, which I won't go into here) which makes the coding tedious from C++. Richard -- Richard Grimes [MVP] author: "Programming with Managed Extensions for Visual C++ .NET", the Microsoft Press book about Managed C++
Tue, 01 Mar 2005 23:28:27 GMT

MS #6 / 11	managed c++ vs unmanaged c++ Quote: > > 2) Can we use Unmanaged Libraries ( Dll's / C++ classes / C++ classes > > encapsulated in dlls ) in Managed Applications? (and vice versa) if yes is > > there any complete example available ?! Yes, when you compile C++ with the /clr option, you are using the CLR as a compiler backend (the C++ will emit IL instead of native machine code). So you are able to almost anything you could do in C++ (including for example, inlined assembly code) + interoperate with managed code, via __gc classes. David
Sun, 27 Mar 2005 04:48:45 GMT

Stu Smit #7 / 11	managed c++ vs unmanaged c++ (inline) Quote: > > > 2) Can we use Unmanaged Libraries ( Dll's / C++ classes / C++ classes > > > encapsulated in dlls ) in Managed Applications? (and vice versa) if yes > is > > > there any complete example available ?! > Yes, when you compile C++ with the /clr option, you are using the CLR as a > compiler backend (the C++ will emit IL instead of native machine code). > So you are able to almost anything you could do in C++ (including for > example, inlined assembly code) + interoperate with managed code, via __gc > classes. Inlined code is converted to IL?? I thought managed C++ emitted x86 code? - Hide quoted text - - Show quoted text - Quote: > David
Tue, 12 Apr 2005 21:23:44 GMT

Tomas Restrepo [MVP #8 / 11	managed c++ vs unmanaged c++ Stu, Quote: > Inlined code is converted to IL?? Nope. Quote: > I thought managed C++ emitted x86 code? Neither. Normally, managed C++ code will be emitted as MSIL (or CIL, whatever you prefer to call it). However, some methods, even in a #prama managed section, cannot be emitted as IL. One of such cases is when it has inline assembly. In These cases, the compiler will try to emit the method as an unmanaged method. Obviously, there are cases where neither option is possible, in which cases the compiler will emit an error. -- Tomas Restrepo
Wed, 13 Apr 2005 01:23:31 GMT

Stu Smit #9 / 11	managed c++ vs unmanaged c++ Ahhh, well, I live and learn. Thanks! Quote: > Stu, > > Inlined code is converted to IL?? > Nope. > > I thought managed C++ emitted x86 code? > Neither. > Normally, managed C++ code will be emitted as MSIL (or CIL, whatever you > prefer to call it). However, some methods, even in a #prama managed section, > cannot be emitted as IL. One of such cases is when it has inline assembly. > In These cases, the compiler will try to emit the method as an unmanaged > method. Obviously, there are cases where neither option is possible, in > which cases the compiler will emit an error. > -- > Tomas Restrepo
Sat, 23 Apr 2005 22:14:40 GMT

Page 1 of 1

[ 11 post ]