Pinning char[] on P/Invoke call

Question

I have object pool of char buffers and passing this buffer on P/Invoke call. Do i need pinning buffer before call or not?

First approach:

[DllImport(\"Na         


        

Answer 1

No, there is auto-pinning for reference types passed to PInvoke.

From https://msdn.microsoft.com/en-us/magazine/cc163910.aspx#S3:

When the runtime marshaler sees that your code is passing to native code a reference to a managed reference object, it automatically pins the object.

so first approach is ok.

Only:

SomeMeth(buffer, 4095);

I do think it is wrong to sprinkle constants around the code...

SomeMeth(buffer, buffer.Length);

or

SomeMeth(buffer, buffer.Length - 1);

would be probably better.