linux--3. File operations

/* * File.cpp:for Linux file methods */#include <fcntl.h> #include <sys/types.h> #include <sys/stat.h& GT, #include <unistd.h> #include <stdio.h> #include <dirent.h> #include <iostream>using    namespace std; #define Unit_test 1//file Classclass file{public:file () {m_fd =-1;    } ~file () {close (); }/* * System LIB Call *///Open//Oflags:o_rdonly, o_wronly, O_RDWR;    O_append, O_trunc, o_creat, O_EXCL//Mode:s_irusr, S_IWUSR, S_ixusr. BOOL Open (const char *path, int oflags = o_rdwr, int mode = S_IRUSR |        S_IWUSR) {M_FD =:: Open (Path, oflags, mode);    return M_FD! =-1;            }//close void Close () {if (m_fd! =-1) {:: Close (M_FD);        M_FD =-1; }}//write size_t write (const void *BUF, size_t nbytes) {if (m_fd! =-1) {RET        urn:: Write (M_FD, buf, nbytes);           }     return-1; }//Read size_t read (void *buf, size_t nbytes) {if (m_fd! =-1) {return:: Read (m_        FD, buf, nbytes);    } return-1;        }//Copy static bool Copy (const char *path, const char *pathout) {File in;        if (!in.open (path, o_rdonly)) {return false;        } File out; if (!out.open (Pathout, O_wronly | O_creat, S_IRUSR |        S_IWUSR)) {return false;        } Char buf[1024];        int nread;        while (nread = In.read (buf, sizeof (BUF))) > 0) {out.write (buf, nread);    } return true; }//Seek off_t Lseek (off_t offset, int whence = Seek_set) {if (m_fd! =-1) {Retur        N:: Lseek (M_FD, offset, whence);    } return-1; }/* * std io lib///fopen, fclose, Fread, Fwrite, Fflush, Fsee, fgetc, FPUTC, FPrintf. /* * Maintain file and folder *//change file or folder access priority static int chmod (const char *    Path, mode_t mode) {return:: chmod (path, mode); } protected:int m_fd;};/    /Directoryclass Directory{public:directory () {m_dir = NULL;    } ~directory () {close ();    }//make dir static int mkdir (const char *path, mode_t mode) {return:: mkdir (path, mode); }//Remove DIR//If the dir is empty static int rmdir (const char *path) {return:: RmDir (Pat    h);    }//change dir static int chdir (const char *path) {return:: chdir (path); }//Get current work directory static char *getcwd (char *buf, size_t size) {return:: GETCWD (BUF, Siz    e);        }//Open dir bool Open (const char *name) {M_dir =:: Opendir (name);    return m_dir! = NULL; }//Read dir//Dirent:d_ino inode num, D_name file name dirent* read (DIR *dir = NULL) {if (!dir) DIR = M_dir;                if (dir) return Readdir (dir);    return NULL;            } void Close () {if (M_dir) {closedir (m_dir);        M_dir = NULL;        }} long int tell (DIR *dir = NULL) {if (!dir) DIR = M_dir;                if (dir) return Telldir (dir);    return-1;        } void Seek (dir *dir = NULL, long int loc = 0) {if (!dir) DIR = M_dir;    if (dir) Seekdir (dir, loc);        }//scan static void scan (const char *path) {//Open dir Directory dir;            if (!dir.open (path)) {cout << "open dir failed:" << path << Endl;        Return                }//Change dir chdir (path);        Scan dir struct dirent *entry;        struct stat statbuf; while (entry =Dir.read ()) = NULL) {lstat (entry->d_name, &statbuf);                if (S_isdir (Statbuf.st_mode)) {//found a dir, but ignore. and.                    if (!strcmp (".", Entry->d_name) | |!strcmp ("..", Entry->d_name)) {                Continue            } scan (Entry->d_name);            } else {cout << entry->d_name << Endl;        }} chdir ("..");    Dir.close (); }protected:dir* M_dir;};        #if unit_test = = 1int Main () {file file; Create Open.txt if (!file.open ("Open.txt", O_RDWR |    O_creat) {cout << "create file Open.txt error.\n";        } else {//write char buf[] = "This is Adfan\nit ' s true\n";                File.write (buf, sizeof (BUF));    File.close (); }//Open if (!file.open ("Open.txt")) {cout <&Lt    "Open file Open.txt error.\n";        } else {char buf[256] = {0};        File.read (BUF, 256);    cout << buf << Endl;        }//Close file File.close ();        Copy file::copy ("Open.txt", "open_out.txt");    Char dir[256];        cout << directory::getcwd (dir, n) << Endl; Scan Directory::scan (dir);} #endif

linux--3. File operations