VarEnum Enumeration

 

Indicates how to marshal the array elements when an array is marshaled from managed to unmanaged code as a UnmanagedType::SafeArray.

Namespace:   System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

[SerializableAttribute]
[ComVisibleAttribute(true)]
public enum class VarEnum

Member nameDescription
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_DISPATCH

Indicates an IDispatch pointer.

VT_EMPTY

Indicates that a value was not specified.

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 a null-terminated string.

VT_LPWSTR

Indicates a wide string terminated by null.

VT_NULL

Indicates a null value, similar to a null value in 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.

Used with System.Runtime.InteropServices::MarshalAsAttribute to explicitly control the element type of the SafeArray.

using namespace System;
using namespace System::Runtime::InteropServices;

// 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")]
interface class IMyStorage
{
   [DispId(1)]
   Object^ GetItem( [In,MarshalAs(UnmanagedType::BStr)]String^ bstrName );

   //[return : MarshalAs(UnmanagedType::Interface)]

   [DispId(2)]
   void GetItems( [In,MarshalAs(UnmanagedType::BStr)]String^ bstrLocation, [Out,MarshalAs(UnmanagedType::SafeArray,
   SafeArraySubType=VarEnum::VT_VARIANT)]array<Object^>^Items );

   [DispId(3)]
   void GetItemDescriptions( [In]String^ bstrLocation, [In,Out,MarshalAs(UnmanagedType::SafeArray)]array<Object^>^varDescriptions );

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

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
Return to top
Show: