\section{Archive formats such as zip}\label{wxarc}
The archive classes handle archive formats such as zip, tar, rar and cab.
-Currently only the wxZip classes are included. wxTar classes are under
-development at \urlref{wxCode}{http://wxcode.sf.net}.
+Currently wxZip and wxTar classes are included.
For each archive type, there are the following classes (using zip here
as an example):
When there are no more entries, GetNextEntry() returns NULL and sets Eof().
\begin{verbatim}
- // 'smart pointer' type created with wxDEFINE_SCOPED_PTR_TYPE
- wxZipEntryPtr entry;
+ auto_ptr<wxZipEntry> entry;
wxFFileInputStream in(_T("test.zip"));
wxZipInputStream zip(in);
\end{verbatim}
-The \helpref{smart pointer}{wxscopedptr} type {\em wxZipEntryPtr}
-can be created like this:
-
-\begin{verbatim}
- #include <wx/ptr_scpd.h>
- wxDEFINE_SCOPED_PTR_TYPE(wxZipEntry);
-
-\end{verbatim}
-
\subsection{Modifying an archive}\label{wxarcmodify}
For example to delete all entries matching the pattern "*.txt":
\begin{verbatim}
- wxFFileInputStreamPtr in(new wxFFileInputStream(_T("test.zip")));
+ auto_ptr<wxFFileInputStream> in(new wxFFileInputStream(_T("test.zip")));
wxTempFileOutputStream out(_T("test.zip"));
wxZipInputStream inzip(*in);
wxZipOutputStream outzip(out);
- // 'smart pointer' type created with wxDEFINE_SCOPED_PTR_TYPE
- wxZipEntryPtr entry;
+ auto_ptr<wxZipEntry> entry;
// transfer any meta-data for the archive as a whole (the zip comment
// in the case of zip)
\end{verbatim}
-The \helpref{smart pointer}{wxscopedptr} types {\em wxZipEntryPtr}
-and {\em wxFFileInputStreamPtr} can be created like this:
-
-\begin{verbatim}
- #include <wx/ptr_scpd.h>
- wxDEFINE_SCOPED_PTR_TYPE(wxZipEntry);
- wxDEFINE_SCOPED_PTR_TYPE(wxFFileInputStream);
-
-\end{verbatim}
-
\subsection{Looking up an archive entry by name}\label{wxarcbyname}
and search for that:
\begin{verbatim}
- // 'smart pointer' type created with wxDEFINE_SCOPED_PTR_TYPE
- wxZipEntryPtr entry;
+ auto_ptr<wxZipEntry> entry;
// convert the local name we are looking for into the internal format
wxString name = wxZipEntry::GetInternalName(localname);
In order to able to write generic code it's necessary to be able to create
instances of the classes without knowing which archive type is being used.
-So there is a class factory for each archive type, derived from
- \helpref{wxArchiveClassFactory}{wxarchiveclassfactory}, which can create
+To allow this there is a class factory for each archive type, derived from
+ \helpref{wxArchiveClassFactory}{wxarchiveclassfactory}, that can create
the other classes.
For example, given {\it wxArchiveClassFactory* factory}, streams and
\begin{verbatim}
// create streams without knowing their type
- wxArchiveInputStreamPtr inarc(factory->NewStream(in));
- wxArchiveOutputStreamPtr outarc(factory->NewStream(out));
+ auto_ptr<wxArchiveInputStream> inarc(factory->NewStream(in));
+ auto_ptr<wxArchiveOutputStream> outarc(factory->NewStream(out));
// create an empty entry object
- wxArchiveEntryPtr entry(factory->NewEntry());
+ auto_ptr<wxArchiveEntry> entry(factory->NewEntry());
\end{verbatim}
-The \helpref{smart pointer}{wxscopedptr} types {\em wxArchiveInputStreamPtr},
-{\em wxArchiveOutputStreamPtr} and {\em wxArchiveEntryPtr} would need to
-have already have been defined, which could be done like this:
+For the factory itself, the static member
+ \helpref{wxArchiveClassFactory::Find()}{wxarchiveclassfactoryfind}.
+can be used to find a class factory that can handle a given file
+extension or mime type. For example, given {\it filename}:
\begin{verbatim}
- #include <wx/ptr_scpd.h>
- wxDEFINE_SCOPED_PTR_TYPE(wxArchiveInputStream);
- wxDEFINE_SCOPED_PTR_TYPE(wxArchiveOutputStream);
- wxDEFINE_SCOPED_PTR_TYPE(wxArchiveEntry);
+ const wxArchiveClassFactory *factory;
+ factory = wxArchiveClassFactory::Find(filename, wxSTREAM_FILEEXT);
+
+ if (factory)
+ stream = factory->NewStream(new wxFFileInputStream(filename));
\end{verbatim}
-The class factory itself can either be created explicitly:
+{\it Find} does not give away ownership of the returned pointer, so it
+does not need to be deleted.
-\begin{verbatim}
- wxArchiveClassFactory *factory = new wxZipClassFactory;
-
-\end{verbatim}
+There are similar class factories for the filter streams that handle the
+compression and decompression of a single stream, such as wxGzipInputStream.
+These can be found using
+ \helpref{wxFilterClassFactory::Find()}{wxfilterclassfactoryfind}.
-or using wxWidgets' \helpref{RTTI}{runtimeclassoverview}:
+For example, to list the contents of archive {\it filename}:
\begin{verbatim}
-wxArchiveClassFactory *MakeFactory(const wxString& type)
-{
- wxString name = _T("wx") + type.Left(1).Upper() +
- type.Mid(1).Lower() + _T("ClassFactory");
-
- wxObject *pObj = wxCreateDynamicObject(name);
- wxArchiveClassFactory *pcf = wxDynamicCast(pObj, wxArchiveClassFactory);
+ auto_ptr<wxInputStream> in(new wxFFileInputStream(filename));
- if (!pcf) {
- wxLogError(_T("can't handle '%s' archives"), type.c_str());
- delete pObj;
+ if (in->IsOk())
+ {
+ // look for a filter handler, e.g. for '.gz'
+ const wxFilterClassFactory *fcf;
+ fcf = wxFilterClassFactory::Find(filename, wxSTREAM_FILEEXT);
+ if (fcf) {
+ in.reset(fcf->NewStream(in.release()));
+ // pop the extension, so if it was '.tar.gz' it is now just '.tar'
+ filename = fcf->PopExtension(filename);
+ }
+
+ // look for a archive handler, e.g. for '.zip' or '.tar'
+ const wxArchiveClassFactory *acf;
+ acf = wxArchiveClassFactory::Find(filename, wxSTREAM_FILEEXT);
+ if (acf) {
+ auto_ptr<wxArchiveInputStream> arc(acf->NewStream(in.release()));
+ auto_ptr<wxArchiveEntry> entry;
+
+ // list the contents of the archive
+ while ((entry.reset(arc->GetNextEntry())), entry.get() != NULL)
+ std::wcout << entry->GetName().c_str() << "\n";
+ }
+ else {
+ wxLogError(_T("can't handle '%s'"), filename.c_str());
+ }
}
- return pcf;
-}
-
\end{verbatim}
\helpref{CopyEntry()}{wxarchiveoutputstreamcopyentry}:
\begin{verbatim}
- wxArchiveInputStreamPtr arc(factory->NewStream(in));
- wxArchiveOutputStreamPtr outarc(factory->NewStream(out));
- wxArchiveEntryPtr entry;
+ auto_ptr<wxArchiveInputStream> arc(factory->NewStream(in));
+ auto_ptr<wxArchiveOutputStream> outarc(factory->NewStream(out));
+ auto_ptr<wxArchiveEntry> entry;
outarc->CopyArchiveMetaData(*arc);
CopyEntry():
\begin{verbatim}
- wxArchiveInputStreamPtr arc(factory->NewStream(in));
- wxArchiveOutputStreamPtr outarc(factory->NewStream(out));
- wxArchiveEntryPtr entry;
- MyNotifier notifier;
+ auto_ptr<wxArchiveInputStream> arc(factory->NewStream(in));
+ auto_ptr<wxArchiveOutputStream> outarc(factory->NewStream(out));
+ auto_ptr<wxArchiveEntry> entry;
+ MyNotifier notifier;
outarc->CopyArchiveMetaData(*arc);
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