Parameter Attributes
The latest version of this topic can be found at Parameter Attributes.
The following attributes apply to parameters of a method in a class or interface.
| Attribute | Description |
|---|---|
| custom | Lets you define your own attribute. |
| defaultvalue | Allows specification of a default value for a typed optional parameter. |
| first_is | Specifies the index of the first array element to be transmitted. |
| iid_is | Specifies the index of the first array element to be transmitted. |
| immediatebind | Indicates that the database will be notified immediately of all changes to a property of a data-bound object. |
| in | Indicates that a parameter is to be passed from the calling procedure to the called procedure. |
| last_is | Specifies the index of the last array element to be transmitted. |
| lcid | Lets you pass a locale identifier to a function. |
| length_is | Specifies the number of array elements to be transmitted. |
| max_is | Designates the maximum value for a valid array index. |
| optional | Specifies an optional parameter for a member function. |
| out | Identifies pointer parameters that are returned from the called procedure to the calling procedure (from the server to the client). |
| range | Specifies a range of allowable values for arguments or fields whose values are set at run time. |
| ref | Identifies a reference pointer. |
| retval | Designates the parameter that receives the return value of the member. |
| satype | Specifies the data type of the SAFEARRAY structure. |
| size_is | Specifies the size of memory allocated for sized pointers, sized pointers to sized pointers, and single- or multidimensional arrays. |
| unique | Specifies a unique pointer. |