Private Clipboard Formats
An application can identify a private clipboard format by defining a value in
the range CF_PRIVATEFIRST through CF_PRIVATELAST. An application can use a
private clipboard format for an application-defined data format that does not need
to be registered with the system.
Data handles associated with private clipboard formats are automatically freed
by the system. Windows that use private clipboard formats can use the
WM_DESTROYCLIPBOARD message to free any related resources that are no longer needed.
For more information about the WM_DESTROYCLIPBOARD message, see
Clipboard Ownership.
An application can place data handles on the clipboard by defining a private
format in the range CF_GDIOBJFIRST through CF_GDIOBJLAST. When using values in
this range, the data handle is not a handle to a GDI object, but is a handle
allocated by the
GlobalAlloc function with the GMEM_DDESHARE and GMEM_MOVEABLE flags. When the clipboard
is emptied the system automatically deletes the object using the
GlobalFree function
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