IntPtr and fixed

[vipin]

Hi All

Is IntPtr a managed or unmanaged data type in c#

Do I need to be doing
Intptr = IPtr
fixed(void * ptr = (void *)IPtr


....


to avoid relocation? or can I use

void *ptr = (void *)Iptr without fixed

thank yo
vipin

[Mattias Sjögren]

Re: IntPtr and fixed

[color=blue]
>Is IntPtr a managed or unmanaged data type in c#?[/color]

Managed. C# only produces managed code, you can't have any unmanaged
types.

[color=blue]
>Do I need to be doing
>Intptr = IPtr;
>fixed(void * ptr = (void *)IPtr )
>{
>
>
>....
>}
>
>to avoid relocation? or can I use
>
>
>void *ptr = (void *)Iptr without fixed?[/color]


Most likely no, but it depends on what the IntPtr is pointing at. I
assume you wouldn't have an IntPtr pointing to something managed
unless you had already pinned it. The first piece of code won't work
though.



Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
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[vipin]

Re: IntPtr and fixed

IntPtr points to a View returned by calling DLLImport MapViewOfFIle from kernel32.dll

I am compiling the code with /unsafe switch

vipin

[Mattias Sjögren]

Re: IntPtr and fixed

[color=blue]
>IntPtr points to a View returned by calling DLLImport MapViewOfFIle from kernel32.dll.[/color]

Then there's no need to pin anything. The handle refers to an
unmanaged resource that's not affected by the GC anyway.



Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.