X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/25c70b07e6484db93baee03de45b67f268c3d8e3..c50db84779471824160c5701a72ad4db9b35c2f2:/include/wx/file.h diff --git a/include/wx/file.h b/include/wx/file.h index ede2b55b17..75471c3b62 100644 --- a/include/wx/file.h +++ b/include/wx/file.h @@ -1,5 +1,5 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: file.cpp +// Name: wx/file.h // Purpose: wxFile - encapsulates low-level "file descriptor" // wxTempFile - safely replace the old file // Author: Vadim Zeitlin @@ -7,42 +7,19 @@ // Created: 29/01/98 // RCS-ID: $Id$ // Copyright: (c) 1998 Vadim Zeitlin -// Licence: wxWindows license +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// -#ifndef __FILEH__ -#define __FILEH__ +#ifndef _WX_FILEH__ +#define _WX_FILEH__ -#ifdef __GNUG__ -#pragma interface "file.h" -#endif +#include "wx/defs.h" -#ifndef WX_PRECOMP - #include "wx/string.h" - #include "wx/filefn.h" -#endif +#if wxUSE_FILE -// ---------------------------------------------------------------------------- -// constants -// ---------------------------------------------------------------------------- - -// we redefine these constants here because S_IREAD &c are _not_ standard -// however, we do assume that the values correspond to the Unix umask bits -#define wxS_IRUSR 00400 -#define wxS_IWUSR 00200 -#define wxS_IXUSR 00100 - -#define wxS_IRGRP 00040 -#define wxS_IWGRP 00020 -#define wxS_IXGRP 00010 - -#define wxS_IROTH 00004 -#define wxS_IWOTH 00002 -#define wxS_IXOTH 00001 - -// default mode for the new files: corresponds to umask 022 -#define wxS_DEFAULT (wxS_IRUSR | wxS_IWUSR | wxS_IRGRP | wxS_IWGRP |\ - wxS_IROTH | wxS_IWOTH) +#include "wx/string.h" +#include "wx/filefn.h" +#include "wx/convauto.h" // ---------------------------------------------------------------------------- // class wxFile: raw file IO @@ -50,77 +27,87 @@ // NB: for space efficiency this class has no virtual functions, including // dtor which is _not_ virtual, so it shouldn't be used as a base class. // ---------------------------------------------------------------------------- -class WXDLLEXPORT wxFile + +class WXDLLIMPEXP_BASE wxFile { public: // more file constants // ------------------- // opening mode - enum OpenMode { read, write, read_write, write_append }; + enum OpenMode { read, write, read_write, write_append, write_excl }; // standard values for file descriptor enum { fd_invalid = -1, fd_stdin, fd_stdout, fd_stderr }; // static functions // ---------------- // check whether a regular file by this name exists - static bool Exists(const char *name); - // check whetther we can access the given file in given mode + static bool Exists(const wxString& name); + // check whether we can access the given file in given mode // (only read and write make sense here) - static bool Access(const char *name, OpenMode mode); + static bool Access(const wxString& name, OpenMode mode); // ctors // ----- // def ctor - wxFile() { m_fd = fd_invalid; } + wxFile() { m_fd = fd_invalid; m_lasterror = 0; } // open specified file (may fail, use IsOpened()) - wxFile(const char *szFileName, OpenMode mode = read); + wxFile(const wxString& fileName, OpenMode mode = read); // attach to (already opened) file - wxFile(int fd) { m_fd = fd; } + wxFile(int lfd) { m_fd = lfd; m_lasterror = 0; } // open/close // create a new file (with the default value of bOverwrite, it will fail if // the file already exists, otherwise it will overwrite it and succeed) - bool Create(const char *szFileName, bool bOverwrite = FALSE, + bool Create(const wxString& fileName, bool bOverwrite = false, int access = wxS_DEFAULT); - bool Open(const char *szFileName, OpenMode mode = read, + bool Open(const wxString& fileName, OpenMode mode = read, int access = wxS_DEFAULT); bool Close(); // Close is a NOP if not opened // assign an existing file descriptor and get it back from wxFile object - void Attach(int fd) { Close(); m_fd = fd; } + void Attach(int lfd) { Close(); m_fd = lfd; m_lasterror = 0; } void Detach() { m_fd = fd_invalid; } int fd() const { return m_fd; } // read/write (unbuffered) - // returns number of bytes read or ofsInvalid on error - off_t Read(void *pBuf, off_t nCount); - // returns true on success + // read all data from the file into a string (useful for text files) + bool ReadAll(wxString *str, const wxMBConv& conv = wxConvAuto()); + // returns number of bytes read or wxInvalidOffset on error + ssize_t Read(void *pBuf, size_t nCount); + // returns the number of bytes written size_t Write(const void *pBuf, size_t nCount); // returns true on success - bool Write(const wxString& s) { return Write(s.c_str(), s.Len()) != 0; } + bool Write(const wxString& s, const wxMBConv& conv = wxMBConvUTF8()); // flush data not yet written bool Flush(); - // file pointer operations (return ofsInvalid on failure) - // move ptr ofs bytes related to start/current off_t/end of file - off_t Seek(off_t ofs, wxSeekMode mode = wxFromStart); + // file pointer operations (return wxInvalidOffset on failure) + // move ptr ofs bytes related to start/current offset/end of file + wxFileOffset Seek(wxFileOffset ofs, wxSeekMode mode = wxFromStart); // move ptr to ofs bytes before the end - off_t SeekEnd(off_t ofs = 0) { return Seek(ofs, wxFromEnd); } - // get current off_t - off_t Tell() const; + wxFileOffset SeekEnd(wxFileOffset ofs = 0) { return Seek(ofs, wxFromEnd); } + // get current offset + wxFileOffset Tell() const; // get current file length - off_t Length() const; + wxFileOffset Length() const; // simple accessors // is file opened? bool IsOpened() const { return m_fd != fd_invalid; } // is end of file reached? bool Eof() const; - // is an error occured? - bool Error() const { return m_error; } + // has an error occurred? + bool Error() const { return m_lasterror != 0; } + // get last errno + int GetLastError() const { return m_lasterror; } + // reset error state + void ClearLastError() { m_lasterror = 0; } + // type such as disk or pipe + wxFileKind GetKind() const { return wxGetFileKind(m_fd); } + // dtor closes the file if opened - ~wxFile(); + ~wxFile() { Close(); } private: // copy ctor and assignment operator are private because @@ -129,8 +116,16 @@ private: wxFile(const wxFile&); wxFile& operator=(const wxFile&); + // Copy the value of errno into m_lasterror if rc == -1 and return true in + // this case (indicating that we've got an error). Otherwise return false. + // + // Notice that we use the possibly 64 bit wxFileOffset instead of int here so + // that it works for checking the result of functions such as tell() too. + bool CheckForError(wxFileOffset rc) const; + + int m_fd; // file descriptor or INVALID_FD if not opened - bool m_error; // error memory + int m_lasterror; // errno value of last error }; // ---------------------------------------------------------------------------- @@ -140,7 +135,8 @@ private: // file (and close this one) or call Discard() to cancel the modification. If // you call neither of them, dtor will call Discard(). // ---------------------------------------------------------------------------- -class WXDLLEXPORT wxTempFile + +class WXDLLIMPEXP_BASE wxTempFile { public: // ctors @@ -154,10 +150,22 @@ public: // is the file opened? bool IsOpened() const { return m_file.IsOpened(); } + // get current file length + wxFileOffset Length() const { return m_file.Length(); } + // move ptr ofs bytes related to start/current offset/end of file + wxFileOffset Seek(wxFileOffset ofs, wxSeekMode mode = wxFromStart) + { return m_file.Seek(ofs, mode); } + // get current offset + wxFileOffset Tell() const { return m_file.Tell(); } // I/O (both functions return true on success, false on failure) - bool Write(const void *p, size_t n) { return m_file.Write(p, n) != 0; } - bool Write(const wxString& str) { return m_file.Write(str); } + bool Write(const void *p, size_t n) { return m_file.Write(p, n) == n; } + bool Write(const wxString& str, const wxMBConv& conv = wxMBConvUTF8()) + { return m_file.Write(str, conv); } + + // flush data: can be called before closing file to ensure that data was + // correctly written out + bool Flush() { return m_file.Flush(); } // different ways to close the file // validate changes and delete the old file of name m_strName @@ -169,10 +177,15 @@ public: ~wxTempFile(); private: + // no copy ctor/assignment operator + wxTempFile(const wxTempFile&); + wxTempFile& operator=(const wxTempFile&); + wxString m_strName, // name of the file to replace in Commit() m_strTemp; // temporary file name wxFile m_file; // the temporary file }; -#endif - // _WX_FILEH__ +#endif // wxUSE_FILE + +#endif // _WX_FILEH__