C++ Interop Memory

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Urs Vogel - 12 Nov 2005 20:24 GMT

Hi

1. Is Marshal::AllocHGlobal(IntPtr) always pinned memory?
2. Is Marshal::AllocHGlobal(int) moveable or pinned memory?

MSDN doesn't really explain that little difference ...

Thanks, Urs

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Jochen Kalmbach [MVP] - 12 Nov 2005 20:55 GMT

Hi Urs!

> 1. Is Marshal::AllocHGlobal(IntPtr) always pinned memory?
> 2. Is Marshal::AllocHGlobal(int) moveable or pinned memory?

Neither has something to do with garbage-collection and therefor
"pinned" makes no sence...

The returned IntPtr always points to a unmanaged memory region!

See: Marshal.AllocHGlobal
http://msdn.microsoft.com/library/en-us/cpref/html/frlrfsystemruntimeinteropserv
icesmarshalclassallochglobaltopic1.asp

and

See: GlobalAlloc
http://msdn.microsoft.com/library/en-us/memory/base/globalalloc.asp

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Greetings
Jochen

My blog about Win32 and .NET
http://blog.kalmbachnet.de/

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