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Purpose |
Manipulate a HEADER control in order to set/retrieve data. |
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Syntax |
HEADER SEND hWin, ID&, Msg&, wParam&, lParam& [TO ResultVar&] |
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hWin |
Handle of the window that owns the Header. |
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ID& |
The Header control identifier. |
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Msg& |
The message you want to send to the Header. |
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wParam& |
The first message parameter (message dependent). |
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lParam& |
The second message parameter (message dependent). |
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ResultVar& |
Variable which receives the message return value. |
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Remarks |
The HEADER statement is used to communicate with a HEADER control to set or retrieve various types of data. While you may create a custom header control for your own purposes, the most common usage is to communicate with the HEADER control which is embedded in every LISTVIEW control. To communicate with a LISTVIEW HEADER, use the LISTVIEW GET HEADERID to get the values for the hWin and ID& parameters. Otherwise, those parameters would be assigned as with any other control. HEADER GET COUNT hWin, ID& TO CountVar& Retrieves the count of the items in a header control. If the operation was successful, the count value is assigned to the variable specified by CountVar&. If the operation failed, the value -1 is assigned to CountVar& instead. HEADER GET ITEM hWin, ID&, Index&, ItemPtr [TO ResultVar&] Retrieves an HD_Item structure which describes an item in a Header Control. Index& defines the item to be retrieved (1=first, 2=second, etc.). ItemPtr is the address of an HD_Item structure to be filled. If the operation succeeds, true is assigned to the variable specified by ResultVar&. If it fails, false is assigned instead. HEADER SEND hWin, ID&, Msg&, wParam&, lParam& [TO ResultVar&] A window message specified by Msg& is sent to the HEADER control, along with message dependent parameters (if any). If a result is returned, it is assigned to the variable specified by ResultVar&. HEADER SET ITEM hWin, ID&, Index&, ItemPtr [TO ResultVar&] Sets the attributes of the specified item in a Header Control. Index& defines the item to be set (1=first, 2=second, etc.). ItemPtr is the address of an HD_Item structure which defines the attributes. If the operation succeeds, true is assigned to the variable specified by ResultVar&. If it fails, false is assigned instead. |
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See also |