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.NET Forum / .NET Framework / Interop / September 2005

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Marshalling variable length C array in C#

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Void Ptr - 05 Sep 2005 08:29 GMT
Hi ,
I want to marshal following C structure .
----------------------------
[C]
struct Foo
{
  int First;
  int Second;
};

struct FooList
{
  int Count;
  Foo List[1];
};

void GetFooList(struct * FooList fList);

I am doing it following way
[C#]
--------------------
[StructLayout(LayoutKind.Sequential)]
class Foo
{
 public Int32 First;
 public Int32 Second;
}

[StructLayout(LayoutKind.Sequential)]
class FooList
{
  public Int32 Count;
  private IntPtr list;//pointer to first
  public Foo[] Foos
  {
     //???? HOW TO DO THIS
  }
}

My problem is how to form objects from IntPtr and return as Foo[].
(If i directly use Marshal.PtrToStruct(list,typeof(Foo)); it throws
object reference not set to object while access Foo.First.)

I googled about it and I found a solution which uses kernel32.dll and
uses GlobalFree, GlobalAlloc API's. But I am  do not want to use
kernel32.dll. Is there any other solution to above problem.

-Void Ptr.
Mattias Sjögren - 09 Sep 2005 20:17 GMT
See if this helps

http://www.dotnetinterop.com/faq/?q=StructWithStructArray
http://www.dotnetinterop.com/faq/?q=VariableLengthStruct

Mattias

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


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