https://invisible-island.net/xterm/xtoolkit/
XtGetSelectionValueIncremental, XtGetSelectionValuesIncremental -
obtain selection values
#include <X11/Intrinsic.h>
void XtGetSelectionValueIncremental(Widget w, Atom selection, Atom tar-
get, XtSelectionCallbackProc callback, XtPointer client_data,
Time time);
void XtGetSelectionValuesIncremental(Widget w, Atom selection, Atom
*targets, int count, XtSelectionCallbackProc callback, XtPointer
*client_data, Time time);
callback Specifies the callback procedure that is to be called when
the selection value has been obtained.
client_data
Specifies the argument that is to be passed to the specified
procedure when it is called.
client_data
Specifies the client data (one for each target type) that is
passed to the callback procedure when it is called for that
target.
count Specifies the length of the targets and client_data lists.
selection Specifies the particular selection desired (that is, primary
or secondary).
target Specifies the type of the information that is needed about
the selection.
targets Specifies the types of information that is needed about the
selection.
time Specifies the timestamp that indicates when the selection
value is desired.
w Specifies the widget that is making the request.
The XtGetSelectionValueIncremental function is similar to XtGetSelec-
tionValue except that the selection_callback procedure will be called
repeatedly upon delivery of multiple segments of the selection value.
The end of the selection value is indicated when selection_callback is
called with a non-NULL value of length zero, which must still be freed
by the client. If the transfer of the selection is aborted in the mid-
dle of a transfer (for example, because to timeout), the selec-
tion_callback procedure is called with a type value equal to the sym-
bolic constant XT_CONVERT_FAIL so that the requestor can dispose of the
partial selection value it has collected up until that point. Upon
receiving XT_CONVERT_FAIL, the requesting client must determine for
itself whether or not a partially completed transfer is meaningful.
The XtGetSelectionValuesIncremental function is similar to XtGet-
SelectionValueIncremental except that it takes a list of target types
and a list of client data and obtains the current value of the selec-
tion converted to each of the targets. The effect is as if each target
were specified in a separate call to XtGetSelectionValueIncremental.
The callback is called once with the corresponding client data for each
target. XtGetSelectionValuesIncremental does guarantee that all the
conversions will use the same selection value because the ownership of
the selection cannot change in the middle of the list, as would be when
calling XtGetSelectionValueIncremental repeatedly.
X Toolkit Intrinsics – C Language Interface
Xlib - C Language X Interface
X Version 11 libXt 1.1.5.XtGetSelectionValueIncremental(3)