TVM_GETCOUNT message

Retrieves a count of the items in a tree-view control. You can send this message explicitly or by using the TreeView_GetCount macro.

Parameters

wParam

Must be zero.

lParam

Must be zero.

Return value

Returns the count of items.

Remarks

The node count returned by TreeView_GetCount is limited to integer values. If you add a node beyond 32767 the macro returns a negative value. After adding 65536 nodes the count returns to zero. When this occurs, the tree-view control appears empty with no scrollbars.

Requirements