IViewObject::Freeze method (oleidl.h)
Freezes the drawn representation of an object so that it will not change until the IViewObject::Unfreeze method is called. The most common use of this method is for banded printing.
Syntax
HRESULT Freeze(
[in] DWORD dwDrawAspect,
[in] LONG lindex,
[in] void *pvAspect,
[out] DWORD *pdwFreeze
);
Parameters
[in] dwDrawAspect
Specifies how the object is to be represented. Representations include content, an icon, a thumbnail, or a printed document. Valid values are taken from the enumeration DVASPECT. See the DVASPECT enumeration for more information.
[in] lindex
Portion of the object that is of interest for the draw operation. Its interpretation varies with dwAspect. See the DVASPECT enumeration for more information.
[in] pvAspect
Pointer to additional information about the view of the object specified in dwAspect. Since none of the current aspects support additional information, pvAspect must always be NULL.
[out] pdwFreeze
Pointer to where an identifying DWORD key is returned. This unique key is later used to cancel the freeze by calling IViewObject::Unfreeze. This key is an index that the default cache uses to keep track of which object is frozen.
Return value
This method returns S_OK on success. Other possible return values include the following.
| Return code | Description |
|---|---|
|
Presentation has already been frozen. The value of pdwFreeze is the identifying key of the already frozen object. |
|
Presentation not in cache. |
|
Invalid value for lindex; currently; only -1 is supported. |
|
Invalid value for dwAspect. |
Remarks
The IViewObject::Freeze method causes the view object to freeze its drawn representation until a subsequent call to IViewObject::Unfreeze releases it. After calling IViewObject::Freeze, successive calls to IViewObject::Draw with the same parameters produce the same picture until IViewObject::Unfreeze is called.
IViewObject::Freeze is not part of the persistent state of the object and does not continue across unloads and reloads of the object.
The most common use of this method is for banded printing.
While in a frozen state, view notifications are not sent. Pending view notifications are deferred to the subsequent call to IViewObject::Unfreeze.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | oleidl.h |