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VarEnum Enumeration
Visual Studio 2010
Indicates how to marshal the array elements when an array is marshaled from managed to unmanaged code as a UnmanagedType::SafeArray.
Assembly: mscorlib (in mscorlib.dll)
| Member name | Description | |
|---|---|---|
| VT_EMPTY | Indicates that a value was not specified. | |
| VT_NULL | Indicates a null value, similar to a null value in SQL. | |
| VT_I2 | Indicates a short integer. | |
| VT_I4 | Indicates a long integer. | |
| VT_R4 | Indicates a float value. | |
| VT_R8 | Indicates a double value. | |
| VT_CY | Indicates a currency value. | |
| VT_DATE | Indicates a DATE value. | |
| VT_BSTR | Indicates a BSTR string. | |
| VT_DISPATCH | Indicates an IDispatch pointer. | |
| VT_ERROR | Indicates an SCODE. | |
| VT_BOOL | Indicates a Boolean value. | |
| VT_VARIANT | Indicates a VARIANT far pointer. | |
| VT_UNKNOWN | Indicates an IUnknown pointer. | |
| VT_DECIMAL | Indicates a decimal value. | |
| VT_I1 | Indicates a char value. | |
| VT_UI1 | Indicates a byte. | |
| VT_UI2 | Indicates an unsigned short. | |
| VT_UI4 | Indicates an unsigned long. | |
| VT_I8 | Indicates a 64-bit integer. | |
| VT_UI8 | Indicates an 64-bit unsigned integer. | |
| VT_INT | Indicates an integer value. | |
| VT_UINT | Indicates an unsigned integer value. | |
| VT_VOID | Indicates a C style void. | |
| VT_HRESULT | Indicates an HRESULT. | |
| VT_PTR | Indicates a pointer type. | |
| VT_SAFEARRAY | Indicates a SAFEARRAY. Not valid in a VARIANT. | |
| VT_CARRAY | Indicates a C style array. | |
| VT_USERDEFINED | Indicates a user defined type. | |
| VT_LPSTR | Indicates a null-terminated string. | |
| VT_LPWSTR | Indicates a wide string terminated by nullptr. | |
| VT_RECORD | Indicates a user defined type. | |
| VT_FILETIME | Indicates a FILETIME value. | |
| VT_BLOB | Indicates length prefixed bytes. | |
| VT_STREAM | Indicates that the name of a stream follows. | |
| VT_STORAGE | Indicates that the name of a storage follows. | |
| VT_STREAMED_OBJECT | Indicates that a stream contains an object. | |
| VT_STORED_OBJECT | Indicates that a storage contains an object. | |
| VT_BLOB_OBJECT | Indicates that a blob contains an object. | |
| VT_CF | Indicates the clipboard format. | |
| VT_CLSID | Indicates a class ID. | |
| VT_VECTOR | Indicates a simple, counted array. | |
| VT_ARRAY | Indicates a SAFEARRAY pointer. | |
| VT_BYREF | Indicates that a value is a reference. |
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(); } };
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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