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This message is sent to the owner of a header control when the control needs data about a callback header item. It is sent as a WM_NOTIFYmessage.
HDN_GETDISPINFO pDispInfo = (LPNMHDDISPINFO) lParam;
Pointer to an NMHDDISPINFOstructure. On input, the members of the structure specify what data is required and the item of interest.
Fill the appropriate members of the structure to return the requested data to the header control. If your message handler sets the maskmember of the NMHDDISPINFOstructure to HDI_DI_SETITEM, the header control stores the data and will not request it again.
|Windows Embedded CE||Windows CE 2.0 and later|
|Windows Mobile||Windows Mobile Version 5.0 and later|