vs2005下的dirent.h

dirent.h是gcc下的一个头文件，而在VS2005中是没有的。这个文件中封装了几个对目录进行操作函数：

static DIR *opendir (const char *dirname); static struct dirent *readdir (DIR *dirp); static int closedir (DIR *dirp);

 对于在linux->windows之间进行程序移植来讲常常会造成一些困扰，在网上仔细搜了一下，发现原来已经有位好同志写了相应的移植代码，如下所示：

typedef struct dirent {   /* name of current directory entry (a multi-byte character string) */   char d_name[MAX_PATH + 1];

  /* file attributes */   WIN32_FIND_DATA data; } dirent;

typedef struct DIR {   /* current directory entry */   dirent current;

  /* is there an un-processed entry in current? */   int cached;

  /* file search handle */   HANDLE search_handle;

  /* search pattern (3 = zero terminator + pattern "//*") */   TCHAR patt[MAX_PATH + 3]; } DIR;

static DIR *opendir (const char *dirname); static struct dirent *readdir (DIR *dirp); static int closedir (DIR *dirp);

/* use the new safe string functions introduced in Visual Studio 2005 */ #if defined(_MSC_VER) && _MSC_VER >= 1400 # define STRNCPY(dest,src,size) strncpy_s((dest),(size),(src),_TRUNCATE) #else # define STRNCPY(dest,src,size) strncpy((dest),(src),(size)) #endif

/*  * Open directory stream DIRNAME for read and return a pointer to the  * internal working area that is used to retrieve individual directory  * entries.  */ static DIR* opendir(     const char *dirname) {   DIR *dirp;   assert (dirname != NULL);   assert (strlen (dirname) < MAX_PATH);

  /* construct new DIR structure */   dirp = (DIR*) malloc (sizeof (struct DIR));   if (dirp != NULL) {     TCHAR *p;         /* prepare search pattern */ #ifdef _UNICODE

    /* convert directory name to wide character string */     MultiByteToWideChar(         CP_ACP,                                /* code page */         0,                                     /* conversion flags */         dirname,                               /* mb-string to convert */         -1,                                    /* length of mb-string */         dirp->patt,                            /* wc-string to produce */         MAX_PATH);                             /* max length of wc-string */     dirp->patt[MAX_PATH] = '/0';         /* append search pattern to directory name */     p = wcschr (dirp->patt, '/0');     if (dirp->patt < p  &&  *(p-1) != '//'  &&  *(p-1) != ':') {       *p++ = '//';     }     *p++ = '*';     *p = '/0';

#else /* !_UNICODE */         /* take directory name... */     STRNCPY (dirp->patt, dirname, sizeof(dirp->patt));     dirp->patt[MAX_PATH] = '/0';         /* ... and append search pattern to it */     p = strchr (dirp->patt, '/0');     if (dirp->patt < p  &&  *(p-1) != '//'  &&  *(p-1) != ':') {       *p++ = '//';     }     *p++ = '*';     *p = '/0';     #endif /* !_UNICODE */

    /* open stream and retrieve first file */     dirp->search_handle = FindFirstFile (dirp->patt, &dirp->current.data);     if (dirp->search_handle == INVALID_HANDLE_VALUE) {       /* invalid search pattern? */       free (dirp);       return NULL;     }

    /* there is an un-processed directory entry in memory now */     dirp->cached = 1;       }   return dirp; }

  /*  * Read a directory entry, and return a pointer to a dirent structure  * containing the name of the entry in d_name field.  Individual directory  * entries returned by this very function include regular files,  * sub-directories, pseudo-directories "." and "..", but also volume labels,  * hidden files and system files may be returned.   */ static struct dirent * readdir(     DIR *dirp) {   assert (dirp != NULL);

  if (dirp->search_handle == INVALID_HANDLE_VALUE) {     /* directory stream was opened/rewound incorrectly or it ended normally */     return NULL;   }

  /* get next directory entry */   if (dirp->cached != 0) {     /* a valid directory entry already in memory */     dirp->cached = 0;   } else {     /* read next directory entry from disk */     if (FindNextFile (dirp->search_handle, &dirp->current.data) == FALSE) {       /* the very last file has been processed or an error occured */       FindClose (dirp->search_handle);       dirp->search_handle = INVALID_HANDLE_VALUE;       return NULL;     }   }

  /* copy directory entry to d_name */ #ifdef _UNICODE     /* convert entry name to multibyte */   WideCharToMultiByte(       CP_ACP,                                  /* code page */       0,                                       /* conversion flags */       dirp->current.data.cFileName,            /* wc-string to convert */       -1,                                      /* length of wc-string */       dirp->current.d_name,                    /* mb-string to produce */       MAX_PATH,                                /* max length of mb-string */       NULL,                                    /* use sys default character */       NULL);                                   /* don't care  */   dirp->current.d_name[MAX_PATH] = '/0';   #else /* !_UNICODE */

  /* copy as a multibyte character string */   STRNCPY (dirp->current.d_name, dirp->current.data.cFileName, sizeof(dirp->current.d_name));   dirp->current.d_name[MAX_PATH] = '/0';

#endif /* !_UNICODE */     return &dirp->current; }

/*  * Close directory stream opened by opendir() function.  Close of the  * directory stream invalidates the DIR structure as well as any previously  * read directory entry.  */ static int closedir(     DIR *dirp) {   assert (dirp != NULL);     /* release search handle */   if (dirp->search_handle != INVALID_HANDLE_VALUE) {     FindClose (dirp->search_handle);     dirp->search_handle = INVALID_HANDLE_VALUE;   }

  /* release directory handle */   free (dirp);   return 0; }

此文件可从http://www.softagalleria.net/dirent/index.en.html下载得到，直接将它放在VS2005的include目录就OK 了！