150 lines
4.8 KiB
C++
150 lines
4.8 KiB
C++
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//
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// ARCD.CPP
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//
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// Source file for ArchiveLib 2.0
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//
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// Copyright (c) Greenleaf Software, Inc. 1994-1996
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// All Rights Reserved
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//
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// CONTENTS
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//
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// ALArchive::Delete()
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// ALArchiveDelete()
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//
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// REVISION HISTORY
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//
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// February 14, 1996 2.0A : New release
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#include "arclib.h"
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#if !defined( AL_IBM )
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#pragma hdrstop
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#endif
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//
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// NAME
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//
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// ALArchive::Delete()
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//
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// PLATFORMS/ENVIRONMENTS
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//
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// Console Windows PM
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// C++ C VB Delphi
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//
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// SHORT DESCRIPTION
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//
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// Delete a number of objects from an archive
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//
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// C++ SYNOPSIS
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//
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// #include "arclib.h"
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//
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// int ALArchive::Delete( ALEntryList &list,
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// ALArchive &destination );
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//
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// C SYNOPSIS
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//
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// #include "arclib.h"
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//
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// int ALArchiveDelete( hALArchive this_object,
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// hALEntryList list,
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// hALArchive output_archive );
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//
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// VB SYNOPSIS
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//
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// Declare Function ALArchiveDelete Lib "AL20LW"
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// (ByVal this_object&, ByVal list&, ByVal object_archive&) As Integer
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//
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// DELPHI SYNOPSIS
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//
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// function ALArchiveDelete( this_object : hALArchive;
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// list : hALEntryList;
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// output_archive : hALArchive ) : Integer;
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//
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// ARGUMENTS
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//
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// this_object : A reference or pointer to the ALArchive object that
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// is going to have some objects deleted. The C++
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// version of this call doesn't have an argument called
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// this_object, because it has implicit access to this,
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// being a member function and all.
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//
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// list : The list of objects that are supposed to be removed
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// from this_object. Remeber that only items that have
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// their marks set will actually be deleted.
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//
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// output_archive : Delete() doesn't actually modify the existing archive.
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// Instead, it creates a new archive that has all the
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// desired objects deleted. The original archive is
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// unchanged after the operation. So anyway, this output
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// archive is where the whole del gets copied.
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//
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// DESCRIPTION
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//
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// This function is used to delete objects from an archive. Most everyone
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// knows how they want this to work. You delete objects from an archive
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// and presto, the same archive now exists in a slim-trim new version.
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// This function implements that, but there is some trickery needed to make
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// it happen.
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//
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// The trickery is needed because we don't really delete objects from the
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// existing archive. Instead, we perform the deletion by copying selected
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// objects to the output archive. When that's done, the output archive
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// looks like the one you want. Unfortunately, it probably has the wrong
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// name at this point.
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//
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// So, to get around this problem, after the Delete() operation we do one
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// last thing. The Rename() functions are called on to rename the original
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// input archive to a backup name. The output file is then renamed to have
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// the same name as the input file.
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//
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// This all works great if your output archive and your input archive are
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// both in the same directory. It even works properly if the input and
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// output are simply on the same volume. But... the rename of the
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// output archive will fail if the input and output are on different
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// volumes. That's because the rename() C RTL function won't move a file
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// from one volume to another.
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//
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// RETURNS
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//
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// The archive status, which we hope is AL_SUCCESS.
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//
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// EXAMPLE
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//
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// SEE ALSO
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//
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// REVISION HISTORY
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//
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// February 14, 1996 2.0A : New release
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//
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int AL_PROTO
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ALArchive::Delete( ALEntryList AL_DLL_FAR &list, /* Tag public function */
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ALArchive AL_DLL_FAR &output_archive )
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{
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output_archive.SetComment( mComment );
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list.ToggleMarks();
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output_archive.Create( *this, list );
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list.ToggleMarks();
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ALName temp = mpArchiveStorageObject->mName;
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mpArchiveStorageObject->RenameToBackup();
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output_archive.mpArchiveStorageObject->Rename( (const char *) temp );
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if ( output_archive.mStatus < 0 )
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return mStatus = output_archive.mStatus;
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return mStatus;
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}
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#if !defined( AL_NO_C )
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extern "C" AL_LINKAGE int AL_FUNCTION
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ALArchiveDelete( hALArchive this_object, /* Tag public function */
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hALEntryList list,
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hALArchive output_archive )
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{
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AL_ASSERT_OBJECT( this_object, ALArchive, "ALArchiveDelete" );
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AL_ASSERT_OBJECT( list, ALEntryList, "ALArchiveDelete" );
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AL_ASSERT_OBJECT( output_archive, ALArchive, "IALArchiveDelete" );
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return ((ALArchive *) this_object )->Delete( *( (ALEntryList *) list ), *( (ALArchive *) output_archive ) );
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}
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#endif
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