[Mono-bugs] [Bug 469217] New: Pointers can not reference marshaled structures.

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https://bugzilla.novell.com/show_bug.cgi?id=469217

User eugeny.grishul at gmail.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=469217#c1

           Summary: Pointers can not reference marshaled structures.
    Classification: Mono
           Product: Mono: Runtime
           Version: 2.2.x
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: interop
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: eugeny.grishul at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


User-Agent:       Opera/9.63 (Windows NT 6.0; U; ru) Presto/2.1.1

Pointers to structs can't be marshalled using P/Invoke but MS VES
implementation allows it. Test for MS .NET:

unsafe class Program
{
    static void Main( string[] args )
    {
        printf( null );
    }

    unsafe struct SomeStruct
    {
        public byte* ptr;
    }

    [DllImport( "msvcrt.dll" )]
    static extern void printf( SomeStruct* arr );
}

Same test for mono (tested on Mac):
unsafe class Program
{
    static void Main( string[] args )
    {
        printf( null );
    }

    unsafe struct SomeStruct
    {
        public byte* ptr;
    }

    [DllImport( "libc.dylib" )]
    static extern void printf( SomeStruct* arr );
}



Reproducible: Always

Steps to Reproduce:
1.
2.
3.
Actual Results:  
Unhandled Exception: System.Runtime.InteropServices.MarshalDirectiveException:
Can not marshal 'parameter #1': Pointers can not reference marshaled
structures. Use byref instead.

Expected Results:  
Nothing should be printed.

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