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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.errorwrapper below:

ErrorWrapper Class (System.Runtime.InteropServices) | Microsoft Learn

ErrorWrapper Class Definition

Caution

ErrorWrapper and support for marshalling to the VARIANT type may be unavailable in future releases.

Wraps objects the marshaler should marshal as a VT_ERROR.

public ref class ErrorWrapper sealed

[System.Obsolete("ErrorWrapper and support for marshalling to the VARIANT type may be unavailable in future releases.")]
public sealed class ErrorWrapper

public sealed class ErrorWrapper

[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public sealed class ErrorWrapper

[<System.Obsolete("ErrorWrapper and support for marshalling to the VARIANT type may be unavailable in future releases.")>]
type ErrorWrapper = class

type ErrorWrapper = class

[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Serializable>]
type ErrorWrapper = class

Public NotInheritable Class ErrorWrapper

Inheritance

Attributes

Examples

The following code example first demonstrates a lone Int32 object marshaled back from COM as an Int32 object. It then demonstrates an Int32 array marshaled back from COM as a UInt32 array.

// Scenario 1:  
// Pass a single value.  
Int32 x = 3;  
Object o = new ErrorWrapper(x);  
// Pass 'o' to COM.  
// On the return trip, 'o' has been unwrapped and is still an Int32 object.  
Int32 y = (Int32)o;  
Scenario 2:  
// Pass an array of values.  
Int32[] arr = new Int32[3];  
Object o = new ErrorWrapper(arr);  
// Pass 'o' to COM.  
// On the return trip, 'o' has been unwrapped and is now a UInt32[] array.  
UInt32[ ] arr2 = (UInt32[])o;

By default, Object type arguments are marshaled as a VARIANT type, where the object type determines the VARTYPE value of the VARIANT.

The ErrorWrapper type must to be passed as an Object type to be marshaled as a VARIANT of type VT_ERROR, otherwise the ErrorWrapper type is marshaled as an integer.

The following table illustrates marshaling in a managed call to a native function, using platform invoke.

Managed signature parameter pArr value Marshaled as ErrorWrapper[] pArr ErrorWrapper[10] of ErrorWrapper(77) Int[10] Object[] pArr ErrorWrapper[10] of ErrorWrapper(77) VARIANT[10] of VT_ERROR Object[] pArr Object[10] of ErrorWrapper(77) VARIANT[10] of VT_ERROR

The following table illustrates marshaling data in a managed call to a native function, using COM runtime callable wrappers (RCW).

Managed signature parameter pArr value Marshaled as ErrorWrapper[] pArr ErrorWrapper[10] of ErrorWrapper(77) Int[10] Object[] pArr ErrorWrapper[10] of ErrorWrapper(77) SafeArrayTypeMismatch exception Object[] pArr Object[10] of ErrorWrapper(77) SAFEARRAY(VARIANT)

Note that ErrorWrapper objects are not marshaled as type VT_ERROR after they are passed back from COM. A single value is marshaled back from COM as type VT_I4, while arrays are marshaled back from COM as type VT_UI4.

For more information on VT_ERROR, please see the existing documentation for VARENUM::VT_ERROR in the MSDN library.

Constructors Properties ErrorCode

Gets the error code of the wrapper.

Methods

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