| Layer | COS_Layer |
| Object | CosNull |
There is only one NULL object, which is used to fill empty or uninitialized
positions in arrays or dictionaries. See Section 3.2.8 in the PDF Reference
for details.
| Method | ||
|---|---|---|
|
CosObj CosNewNull()
Returns a direct object of type CosNull. This NULL object is said to be invalid. You can compare an object to NULL using either of the following methods (the second is more efficient):
|
||
| CosNewNull | () |
| Product availability: All |
| Platform availability: All |
CosObj CosNewNull()
Returns a direct object of type CosNull. This NULL object is said to be invalid. You can compare an object to NULL using either of the following methods (the second is more efficient):
CosObjEqual(obj, CosNewNull());
CosObjGetType(obj) == CosNull;
In general, use CosNewNull() only to initialize a local variable or pass a parameter. NULL objects may be stored as array elements, but not as dictionary values. The following statements are equivalent:
CosDictPut(dict, key, CosNewNull());
CosDictRemove(dict, key);
A |
See Also
Since
| File: CosProcs.h |
| Line: 142 |