System.Runtime.InteropServices.VarEnum Enumeration

Summary

Indicates how the array elements should be marshaled when an array is marshaled from managed to unmanaged code as a System.Runtime.InteropServices.UnmanagedType.SafeArray (not supported on the shared source CLI) .

C# Syntax:

[Serializable] public enum VarEnum

Used with MarshalAsAttribute to explicitly control the element type of the System.Runtime.InteropServices.UnmanagedType.SafeArray (not supported on the shared source CLI) .

using System;
using System.Runtime.InteropServices;

namespace MyModule
{
	// If you do not have a type library for an interface
	// you can redeclare it using ComImportAttribute.

	// This is how the interface would look in an idl file.

	//[
	//object,
	//uuid("73EB4AF8-BE9C-4b49-B3A4-24F4FF657B26"),
	//dual,	helpstring("IMyStorage Interface"),
	//pointer_default(unique)
	//]
	//interface IMyStorage : IDispatch
	//{
	//	[id(1)]
	//	HRESULT GetItem([in] BSTR bstrName, [out, retval] IDispatch ** ppItem);
	//	[id(2)]
	//	HRESULT GetItems([in] BSTR bstrLocation, [out] SAFEARRAY(VARIANT)* pItems);
	//	[id(3)]
	//	HRESULT GetItemDescriptions([in] BSTR bstrLocation, [out] SAFEARRAY(VARIANT) ** ppItems);
	//	[id(4), propget]
	//	HRESULT get_IsEmpty([out, retval] BOOL * pfEmpty);
	//};

	// This is the managed declaration.

	[ComImport]
	[Guid("73EB4AF8-BE9C-4b49-B3A4-24F4FF657B26")]
	public interface IMyStorage  
	{
		[DispId(1)]
		[return : MarshalAs( UnmanagedType.Interface )]
		Object GetItem( [In, MarshalAs( UnmanagedType.BStr )] String bstrName );

		[DispId(2)]
		void GetItems( [In, MarshalAs( UnmanagedType.BStr )] String bstrLocation, 
			[Out, MarshalAs( UnmanagedType.SafeArray, 
					  SafeArraySubType = VarEnum.VT_VARIANT )] out Object[] Items );
                
                
		[DispId(3)]
		void GetItemDescriptions( [In] String bstrLocation, 
			[In, Out, MarshalAs( UnmanagedType.SafeArray )] ref Object[] varDescriptions );

		bool IsEmpty 
		{
			[DispId(4)]
			[return : MarshalAs( UnmanagedType.VariantBool )]
			get;
		}
	}
}

    

System.Runtime.InteropServices Namespace

System.Runtime.InteropServices.VarEnum Member List:

Public Fields

VT_ARRAY	Indicates a SAFEARRAY pointer.
VT_BLOB	Indicates length prefixed bytes.
VT_BLOB_OBJECT	Indicates that a blob contains an object.
VT_BOOL	Indicates a Boolean value.
VT_BSTR	Indicates a BSTR string.
VT_BYREF	Indicates that a value is a reference.
VT_CARRAY	Indicates a C style array.
VT_CF	Indicates the clipboard format.
VT_CLSID	Indicates a class ID.
VT_CY	Indicates a currency value.
VT_DATE	Indicates a DATE value.
VT_DECIMAL	Indicates a decimal value.
VT_EMPTY
VT_ERROR	Indicates an SCODE.
VT_FILETIME	Indicates a FILETIME value.
VT_HRESULT	Indicates an HRESULT.
VT_I1	Indicates a char value.
VT_I2	Indicates a short integer.
VT_I4	Indicates a long integer.
VT_I8	Indicates a 64-bit integer.
VT_INT	Indicates an integer value.
VT_LPSTR	Indicates null terminated string.
VT_LPWSTR	Indicates a wide string terminated by null.
VT_NULL	Indicates null similar to SQL.
VT_PTR	Indicates a pointer type.
VT_R4	Indicates a float value.
VT_R8	Indicates a double value.
VT_RECORD	Indicates a user defined type.
VT_SAFEARRAY	Indicates a SAFEARRAY. Not valid in a VARIANT.
VT_STORAGE	Indicates that the name of a storage follows.
VT_STORED_OBJECT	Indicates that a storage contains an object.
VT_STREAM	Indicates that the name of a stream follows.
VT_STREAMED_OBJECT	Indicates that a stream contains an object.
VT_UI1	Indicates a byte.
VT_UI2	Indicates an unsignedshort.
VT_UI4	Indicates an unsignedlong.
VT_UI8	Indicates an 64-bit unsigned integer.
VT_UINT	Indicates an unsigned integer value.
VT_UNKNOWN	Indicates an IUnknown pointer.
VT_USERDEFINED	Indicates a user defined type.
VT_VARIANT	Indicates a VARIANT far pointer.
VT_VECTOR	Indicates a simple counted array.
VT_VOID	Indicates a C style void.

Hierarchy:

• System.Object
• System.ValueType
• System.Enum
• System.Runtime.InteropServices.VarEnum

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