PRB: Tlbexp.exe May Produce Invalid Method Declarations (317322)

Microsoft Windows .NET Framework 1.1

Microsoft .NET Framework 1.0

This article was previously published under Q317322

SYMPTOMS

When you use invalid or incompatible combinations of SafeArraySubType, Tlbexp.exe may produce invalid signatures for a method call.

CAUSE

Tlbexp.exe does not perform any validation before it produces the type library for the managed class.

STATUS

This behavior is by design.

MORE INFORMATION

For example, a managed class may implement the following interface:

public interface IAnimal
{
	void Eat([MarshalAs(UnmanagedType.SafeArray, SafeArraySubType=VarEnum.VT_CY)] string [] x);
	void EatSomeMore([MarshalAs(UnmanagedType.SafeArray, SafeArraySubType=VarEnum.VT_R8)] byte [] x);
}

When this managed class is exposed by using Tlbexp.exe, it produces the following type library definition for COM-based clients to consume:

interface IAnimal : IDispatch 
{
    [id(0x60020000)]
    HRESULT Eat([in] SAFEARRAY(CURRENCY) x);
    [id(0x60020001)]
    HRESULT EatSomeMore([in] SAFEARRAY(double) x);
};

Modification Type:

Minor

Last Reviewed:

5/28/2003

Keywords:

kbCOMInterop kbprb KB317322