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IMAPITable::GetCollapseState

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Returns the data necessary to rebuild the current collapsed or expanded state of a categorized table.

HRESULT GetCollapseState(
ULONG ulFlags,
ULONG cbInstanceKey,
LPBYTE lpbInstanceKey,
ULONG FAR * lpcbCollapseState,
LPBYTE FAR * lppbCollapseState
);

ulFlags

Reserved; must be zero.

cbInstanceKey

[in] Count of bytes in the instance key pointed to by the lpbInstanceKey parameter.

lpbInstanceKey

[in] Pointer to the PR_INSTANCE_KEY (PidTagInstanceKey) property of the row at which the current collapsed or expanded state should be rebuilt. The lpbInstanceKey parameter cannot be NULL.

lpcbCollapseState

[out] Pointer to the count of structures pointed to by the lppbCollapseState parameter.

lppbCollapseState

[out] Pointer to a pointer to structures containing data describing the current table view.

S_OK

The state for the categorized table was successfully saved.

MAPI_E_BUSY

Another operation is in progress that prevents the operation from starting. Either the operation in progress should be allowed to complete or it should be stopped.

MAPI_E_NO_SUPPORT

The table does not support categorization and expanded and collapsed views.

The IMAPITable::GetCollapseState method works with the IMAPITable::SetCollapseState method to change the user's view of a categorized table. GetCollapseState saves the data necessary for SetCollapseState to use to rebuild the appropriate views of the categories of a categorized table. Service providers determine the data to be saved. However, most service providers implementing GetCollapseState save:

  • The sort keys (standard columns and category columns).

  • Information about the row that the instance key represents.

  • Information to restore the collapsed and expanded categories of the table.

For more information about categorized tables, see Sorting and Categorization.

Store the entire current state of all nodes of a table in the lppbCollapseState parameter.

Always call GetCollapseState before calling SetCollapseState.

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