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.NET Forum / .NET Framework / Interop / January 2007casting void * or IntPtr to managemed object
Hello, I've got a DLL function that return a void * pointer very similar to malloc(), and I need to cast it to a managed type. For this example, I'd be happy to cast it to a string type. Can anyone shed some light on how to do this in C#? Thanks! JW James, >For this example, I'd be >happy to cast it to a string type. Can anyone shed some light on how to do >this in C#? call Marshal.PtrToString[Ansi/Uni/Auto]() Mattias  SignatureMattias Sjögren [C# MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com Please reply only to the newsgroup. Okay. Yeah, I looked at this method. From the documentation, I understood it to mean it would *copy* the unmanaged memory to a the managed object, not *create* the managed object from unmanaged memory. Is this not correct? Put another way, if I use this method call and create a managed string object, and then I append some characters to the string, does it actually use/change the unmanaged memory? Best, JW > James, > [quoted text clipped - 6 lines] > > Mattias James, >Put another way, if I use this method call and create a managed string >object, and then I append some characters to the string, does it actually >use/change the unmanaged memory? No. If that's what you want, you'll have to copy the changes back to the original buffer yourself. Mattias SignatureMattias Sjögren [C# MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com Please reply only to the newsgroup. That's fine. So just to clarify then, C# doesn't support type casting (or otherwise marshalling) unmanaged memory to a managed type in any way, shape or form, right? Thanks for you help, JW > James, > [quoted text clipped - 6 lines] > > Mattias James, >That's fine. So just to clarify then, C# doesn't support type casting (or >otherwise marshalling) unmanaged memory to a managed type in any way, shape >or form, right? Correct. Managed objects must be allocated on a GC heap. Mattias SignatureMattias Sjögren [C# MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com Please reply only to the newsgroup.
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