[Mono-bugs] [Bug 62610][Wis] New - Attaching MarshalAsAttribute via SRE does not work as expected

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Fri, 6 Aug 2004 03:28:12 -0400 (EDT)

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Changed by mathpup@mylinuxisp.com.


--- shadow/62610	2004-08-06 03:28:12.000000000 -0400
+++ shadow/62610.tmp.23301	2004-08-06 03:28:12.000000000 -0400
@@ -0,0 +1,70 @@
+Bug#: 62610
+Product: Mono: Class Libraries
+Version: unspecified
+OS Details: 
+Status: NEW   
+Priority: Wishlist
+Component: CORLIB
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: mathpup@mylinuxisp.com               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+Summary: Attaching MarshalAsAttribute via SRE does not work as expected
+Description of Problem: 
+We want to create types (delegates, specifically) using SRE, and we need 
+to attach some custom marshaler information to certain parameters. 
+Specifically, we want to attach this to them: 
+[MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = 
+Unfortunately, CustomAttributeBuilder does not seem to handle the custom 
+marshaler settings properly. CustomAttributeBuilder.get_umarshal() seems 
+to do the work for other types of marshaling, but not for custom 
+I know that mcs handles certain attributes as special cases, and with the 
+MarshalAs attribute, it uses UnmanagedMarshal.DefineCustom() instead of 
+the way that I'm using. Unfortunately, DefineCustom() is a Mono-only 
+method and is not portable. 
+Steps to reproduce the problem: 
+1. gcc -O -o libtest.so -shared custom.c 
+2. mcs custom.cs 
+3. mono custom.exe 
+Actual Results: 
+Unhandled Exception: System.NullReferenceException: Object reference not 
+set to an instance of an object 
+in (unmanaged) (wrapper managed-to-native) 
+System.Object:__icall_wrapper_mono_delegate_to_ftnptr (object) 
+in <0x00004> (wrapper managed-to-native) 
+System.Object:__icall_wrapper_mono_delegate_to_ftnptr (object) 
+in <0x0002a> (wrapper managed-to-native) Testing:RegisterCallback 
+in <0x00342> Testing:Main () 
+Expected Results: 
+Method( *Orange* ) 
+How often does this happen?  
+Additional Information: