X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/830f8f11bca5c0892ae767ba14790c8b5b59011f..11e3c6ef36393fb5863ea2f9601d8facd73acb12:/include/wx/file.h diff --git a/include/wx/file.h b/include/wx/file.h index 7f3f0e8184..75471c3b62 100644 --- a/include/wx/file.h +++ b/include/wx/file.h @@ -1,5 +1,5 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: file.h +// Name: wx/file.h // Purpose: wxFile - encapsulates low-level "file descriptor" // wxTempFile - safely replace the old file // Author: Vadim Zeitlin @@ -19,29 +19,7 @@ #include "wx/string.h" #include "wx/filefn.h" -#include "wx/strconv.h" - -// ---------------------------------------------------------------------------- -// 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/convauto.h" // ---------------------------------------------------------------------------- // class wxFile: raw file IO @@ -63,46 +41,43 @@ public: // static functions // ---------------- // check whether a regular file by this name exists - static bool Exists(const wxChar *name); + 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 wxChar *name, OpenMode mode); + static bool Access(const wxString& name, OpenMode mode); // ctors // ----- // def ctor - wxFile() { m_fd = fd_invalid; m_error = false; } + wxFile() { m_fd = fd_invalid; m_lasterror = 0; } // open specified file (may fail, use IsOpened()) - wxFile(const wxChar *szFileName, OpenMode mode = read); + wxFile(const wxString& fileName, OpenMode mode = read); // attach to (already opened) file - wxFile(int lfd) { m_fd = lfd; m_error = false; } + 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 wxChar *szFileName, bool bOverwrite = false, + bool Create(const wxString& fileName, bool bOverwrite = false, int access = wxS_DEFAULT); - bool Open(const wxChar *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 lfd) { Close(); m_fd = lfd; m_error = false; } + 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) + // 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, const wxMBConv& conv = wxConvUTF8) - { - const wxWX2MBbuf buf = s.mb_str(conv); - size_t size = strlen(buf); - return Write((const char *) buf, size) == size; - } + bool Write(const wxString& s, const wxMBConv& conv = wxMBConvUTF8()); // flush data not yet written bool Flush(); @@ -122,10 +97,15 @@ public: // is end of file reached? bool Eof() const; // has an error occurred? - bool Error() const { return m_error; } + 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() { Close(); } @@ -136,8 +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 }; // ---------------------------------------------------------------------------- @@ -172,9 +160,13 @@ public: // 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) == n; } - bool Write(const wxString& str, const wxMBConv& conv = wxConvUTF8) + 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 bool Commit();