DlgCopy
DlgCopy Copy selected text from editText item to TE scrap
#include <Dialogs.h> Dialog Manager
void DlgCopy(theDialog );
DialogPtr theDialog ; identifies dialog window with text to copy
DlgCopy copies the current selection of the current editText item of a dialog
into the TextEdit scrap. It is a quick way to process a copy command (C)
event for a dialog.
theDialog is the address of a DialogRecord. it identifies the dialog containing
the item to which the copy operation should be applied.
Returns: none

Notes: If the current dialog contains no editText items, or if none is active, this
function does nothing. Otherwise, it performs a TECopy on the
currently-selected text.
The item number-1 of the active editText field is kept in the editField field
of the DialogRecord and a handle to its TERec is kept in the textH field.
Thus, this call is functionally equivalent to:
DialogPeek theDlgPeek;
theDlgPeek = (DialogPeek) theDialog;
if ( theDlgPeek -> editField > 0 ) {
TECopy( theDlgPeek->textH );
}
In a modal dialog, DlgCut, DlgCopy, DlgPaste, and DlgDelete are
typically performed in a filter function (see ModalDialog). In a modeless
dialog, you should check for X, C, V, and B by examining the event
record after calling IsDialogEvent and when present, use the DlgXxx calls
instead of DialogSelect.
You do not need to support cut-and-paste in editText items, but since it is
easy to do, it is recommended.