[Mono-list] Assertion when accessing C library

[Robert Jordan]

This is already fixed in SVN.

Robert

Ben Henderson wrote:
> I posted a question on this assertion a few days ago with no response.  Not
> sure about your case, but I was trying to send a native function pointer
> into a native function via p/invoke.  I was receiving the same assertion
> which looks to me that it doesn't like the managed delegate wrapping a
> p/invoke function.  I worked around the issue by marshaling a managed
> delegate for the function pointer parameter in the native function and then
> calling the native function from the managed delegate.  (Hope this makes
> sense!)  I'll post sample code below.  If you are getting this assertion in
> a different scenario, please post some code.  Also, I am going to submit a
> bug on this, as the MS CLR has no problem marshaling the native function
> pointer.
> 
> Ben
> 
> using System;
> using System.Runtime.InteropServices;
> 
> namespace FunctionPointerInterop
> {
>     class Program
>     {
>         [DllImport("testdll.dll")]
>         public extern static void foo();
> 
>         [DllImport("testdll.dll")]
>         public extern static void bar(foo_delegate foo);
> 
>         public delegate void foo_delegate();
> 
>         static foo_delegate my_foo_delegate;
> 
>         static void ManagedFooDelegate()
>         {
>             foo();
>         }
> 
>         static void Main(string[] args)
>         {
>             my_foo_delegate = new foo_delegate(ManagedFooDelegate);
>             bar(my_foo_delegate);
>         }
>     }
> }
> 
> 
> rumcajz wrote:
>> Anyone has any idea what this assertion is supposed to mean:
>>
>> ERROR:marshal.c:9235:mono_marshal_get_managed_wrapper: assertion failed:
>> (!mono_method_signature (method)->pinvoke)
>> Stacktrace:
>>
>>   at (wrapper managed-to-native)
>> object.__icall_wrapper_mono_delegate_to_ftnptr (object) <0x00045>
>>   at (wrapper managed-to-native)
>> object.__icall_wrapper_mono_delegate_to_ftnptr (object) <0xffffffff>
>>
>> Thanks.
>>
>