The Header_GetItem macro retrieves information about an item in a
header control. You can use this macro or explicitly send the HDM_GETITEM
Handle to the header control.
Index of the item for which information is to be retrieved.
Pointer to an HD_ITEM structure. When the
message is sent, the mask member indicates the type of information
being requested. When the message returns, the other members receive the
requested information. If the mask member specifies zero, the message
returns TRUE but copies no information to the structure.
If the operation succeeds, the return value is TRUE.
If the operation fails, the return value is FALSE.
The Header_GetItem macro is defined as follows:
#define Header_GetItem(hwndHD, index, phdi) \
(BOOL)SendMessage((hwndHD), HDM_GETITEM, \
(WPARAM)(int)(index), (LPARAM)(HD_ITEM FAR*)(phdi))
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