373 lines
12 KiB
C
373 lines
12 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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// Name: dir.h
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// Purpose: interface of wxDir and wxDirTraverser
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// Author: wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/**
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Possible return values of wxDirTraverser callback functions.
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*/
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enum wxDirTraverseResult
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{
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wxDIR_IGNORE = -1, ///< Ignore this directory but continue with others.
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wxDIR_STOP, ///< Stop traversing.
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wxDIR_CONTINUE ///< Continue into this directory.
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};
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/**
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@class wxDirTraverser
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wxDirTraverser is an abstract interface which must be implemented by
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objects passed to wxDir::Traverse() function.
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Example of use (this works almost like wxDir::GetAllFiles()):
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@code
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class wxDirTraverserSimple : public wxDirTraverser
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{
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public:
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wxDirTraverserSimple(wxArrayString& files) : m_files(files) { }
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virtual wxDirTraverseResult OnFile(const wxString& filename)
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{
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m_files.Add(filename);
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return wxDIR_CONTINUE;
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}
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virtual wxDirTraverseResult OnDir(const wxString& WXUNUSED(dirname))
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{
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return wxDIR_CONTINUE;
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}
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private:
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wxArrayString& m_files;
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};
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// get the names of all files in the array
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wxArrayString files;
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wxDirTraverserSimple traverser(files);
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wxDir dir(dirname);
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dir.Traverse(traverser);
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@endcode
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@library{wxbase}
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@category{file}
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*/
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class wxDirTraverser
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{
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public:
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/**
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This function is called for each directory. It may return ::wxDIR_STOP
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to abort traversing completely, ::wxDIR_IGNORE to skip this directory
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but continue with others or ::wxDIR_CONTINUE to enumerate all files and
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subdirectories in this directory.
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This is a pure virtual function and must be implemented in the derived
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class.
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*/
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virtual wxDirTraverseResult OnDir(const wxString& dirname) = 0;
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/**
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This function is called for each file. It may return ::wxDIR_STOP to
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abort traversing (for example, if the file being searched is found) or
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::wxDIR_CONTINUE to proceed.
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This is a pure virtual function and must be implemented in the derived
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class.
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*/
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virtual wxDirTraverseResult OnFile(const wxString& filename) = 0;
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/**
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This function is called for each directory which we failed to open for
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enumerating. It may return ::wxDIR_STOP to abort traversing completely,
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::wxDIR_IGNORE to skip this directory but continue with others or
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::wxDIR_CONTINUE to retry opening this directory once again.
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The base class version always returns ::wxDIR_IGNORE.
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*/
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virtual wxDirTraverseResult OnOpenError(const wxString& openerrorname);
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};
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/**
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These flags affect the behaviour of GetFirst/GetNext() and Traverse(),
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determining what types are included in the list of items they produce.
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*/
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enum wxDirFlags
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{
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wxDIR_FILES = 0x0001, ///< Includes files.
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wxDIR_DIRS = 0x0002, ///< Includes directories.
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wxDIR_HIDDEN = 0x0004, ///< Includes hidden files.
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wxDIR_DOTDOT = 0x0008, ///< Includes "." and "..".
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/**
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Don't follow symbolic links during the directory traversal.
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This flag is ignored under systems not supporting symbolic links (i.e.
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non-Unix ones).
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Notice that this flag is @e not included in wxDIR_DEFAULT and so the
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default behaviour of wxDir::Traverse() is to follow symbolic links,
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even if they lead outside of the directory being traversed.
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@since 2.9.5
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*/
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wxDIR_NO_FOLLOW = 0x0010,
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/**
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Default directory traversal flags include both files and directories,
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even hidden.
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Notice that by default wxDIR_NO_FOLLOW is @e not included, meaning that
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symbolic links are followed by default. If this is not desired, you
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must pass that flag explicitly.
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*/
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wxDIR_DEFAULT = wxDIR_FILES | wxDIR_DIRS | wxDIR_HIDDEN
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};
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/**
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@class wxDir
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wxDir is a portable equivalent of Unix open/read/closedir functions which
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allow enumerating of the files in a directory. wxDir allows enumerating
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files as well as directories.
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wxDir also provides a flexible way to enumerate files recursively using
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Traverse() or a simpler GetAllFiles() function.
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Example of use:
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@code
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wxDir dir(wxGetCwd());
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if ( !dir.IsOpened() )
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{
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// deal with the error here - wxDir would already log an error message
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// explaining the exact reason of the failure
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return;
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}
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puts("Enumerating object files in current directory:");
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wxString filename;
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bool cont = dir.GetFirst(&filename, filespec, flags);
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while ( cont )
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{
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printf("%s\n", filename.c_str());
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cont = dir.GetNext(&filename);
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}
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@endcode
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@library{wxbase}
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@category{file}
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*/
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class wxDir
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{
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public:
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/**
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Default constructor, use Open() afterwards.
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*/
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wxDir();
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/**
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Opens the directory for enumeration, use IsOpened() to test for errors.
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*/
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wxDir(const wxString& dir);
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/**
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Destructor cleans up the associated resources by calling Close().
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It is not virtual and so this class is not meant to be used
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polymorphically.
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*/
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~wxDir();
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/**
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Close the directory.
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The object can't be used after closing it, but Open() may be called
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again to reopen it later.
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@since 2.9.5
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*/
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void Close();
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/**
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Test for existence of a directory with the given name.
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*/
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static bool Exists(const wxString& dir);
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/**
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The function returns the path of the first file matching the given
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@a filespec or an empty string if there are no files matching it.
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The @a flags parameter may or may not include ::wxDIR_FILES, the
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function always behaves as if it were specified. By default, @a flags
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includes ::wxDIR_DIRS and so the function recurses into the
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subdirectories but if this flag is not specified, the function
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restricts the search only to the directory @a dirname itself.
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See ::wxDirFlags for the list of the possible flags.
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@see Traverse()
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*/
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static wxString FindFirst(const wxString& dirname,
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const wxString& filespec,
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int flags = wxDIR_DEFAULT);
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/**
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The function appends the names of all the files under directory
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@a dirname to the array @a files (note that its old content is
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preserved). Only files matching the @a filespec are taken, with empty
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spec matching all the files.
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The @a flags parameter should always include ::wxDIR_FILES or the array
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would be unchanged and should include ::wxDIR_DIRS flag to recurse into
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subdirectories (both flags are included in the value by default).
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See ::wxDirFlags for the list of the possible flags.
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@return Returns the total number of files found while traversing
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the directory @a dirname (i.e. the number of entries appended
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to the @a files array).
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@see Traverse()
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*/
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static size_t GetAllFiles(const wxString& dirname, wxArrayString* files,
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const wxString& filespec = wxEmptyString,
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int flags = wxDIR_DEFAULT);
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/**
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Start enumerating all files matching @a filespec (or all files if it is
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empty) and @e flags, return @true on success.
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See ::wxDirFlags for the list of the possible flags.
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*/
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bool GetFirst(wxString* filename,
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const wxString& filespec = wxEmptyString,
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int flags = wxDIR_DEFAULT) const;
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/**
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Returns the name of the directory itself.
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The returned string does not have the trailing path separator (slash or
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backslash).
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Notice that in spite of this the last character of the returned string
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can still be the path separator if this directory is the root one.
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Because of this, don't append @c wxFILE_SEP_PATH to the returned value
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if you do need a slash-terminated directory name but use
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GetNameWithSep() instead to avoid having duplicate consecutive slashes.
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*/
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wxString GetName() const;
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/**
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Returns the name of the directory with the path separator appended.
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The last character of the returned string is always @c wxFILE_SEP_PATH
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unless the string is empty, indicating that this directory is invalid.
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@see GetName()
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@since 2.9.4
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*/
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wxString GetNameWithSep() const;
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/**
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Continue enumerating files which satisfy the criteria specified by the
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last call to GetFirst().
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*/
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bool GetNext(wxString* filename) const;
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/**
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Returns the size (in bytes) of all files recursively found in @c dir or
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@c wxInvalidSize in case of error.
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In case it happens that while traversing folders a file's size cannot
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be read, that file is added to the @a filesSkipped array, if not @NULL,
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and then skipped. This usually happens with some special folders which
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are locked by the operating system or by another process. Remember that
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when the size of @a filesSkipped is not zero, then the returned value
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is not 100% accurate and, if the skipped files were big, it could be
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far from real size of the directory.
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@see wxFileName::GetHumanReadableSize(), wxGetDiskSpace()
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*/
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static wxULongLong GetTotalSize(const wxString& dir,
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wxArrayString* filesSkipped = NULL);
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/**
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Returns @true if the directory contains any files matching the given
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@a filespec. If @a filespec is empty, look for any files at all. In any
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case, even hidden files are taken into account.
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*/
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bool HasFiles(const wxString& filespec = wxEmptyString) const;
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/**
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Returns @true if the directory contains any subdirectories (if a non
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empty @a filespec is given, only check for directories matching it).
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The hidden subdirectories are taken into account as well.
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*/
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bool HasSubDirs(const wxString& dirspec = wxEmptyString) const;
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/**
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Returns @true if the directory was successfully opened by a previous
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call to Open().
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*/
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bool IsOpened() const;
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/**
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Creates a directory.
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This is just an alias for wxFileName::Mkdir(); refer to that function
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for more info.
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*/
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static bool Make(const wxString &dir, int perm = wxS_DIR_DEFAULT,
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int flags = 0);
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/**
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Open the directory for enumerating, returns @true on success or @false
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if an error occurred.
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*/
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bool Open(const wxString& dir);
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/**
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Removes a directory.
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This is just an alias for wxFileName::Rmdir(); refer to that function
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for more info.
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*/
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static bool Remove(const wxString &dir, int flags = 0);
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/**
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Enumerate all files and directories under the given directory.
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If @a flags contains ::wxDIR_DIRS this enumeration is recursive, i.e.
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all the subdirectories of the given one and the files inside them will
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be traversed. Otherwise only the files in this directory itself are.
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If @a flags doesn't contain ::wxDIR_FILES then only subdirectories are
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examined but not normal files. It doesn't make sense to not specify
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either ::wxDIR_DIRS or ::wxDIR_FILES and usually both of them should be
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specified, as is the case by default.
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For each directory found, @ref wxDirTraverser::OnDir() "sink.OnDir()"
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is called and @ref wxDirTraverser::OnFile() "sink.OnFile()" is called
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for every file. Depending on the return value, the enumeration may
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continue or stop. If entering a subdirectory fails, @ref
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wxDirTraverser::OnOpenError() "sink.OnOpenError()" is called.
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The function returns the total number of files found or @c "(size_t)-1"
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on error.
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See ::wxDirFlags for the full list of the possible flags.
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@see GetAllFiles()
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*/
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size_t Traverse(wxDirTraverser& sink,
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const wxString& filespec = wxEmptyString,
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int flags = wxDIR_DEFAULT) const;
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};
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