请大家帮帮忙!

[litaiming]

我有个任务,想用c实现,请大家帮帮忙(我是c菜鸟,常用dev-c):系统盘中有个文件夹下有n(n>1000)个文件,文件名为wj+xxxxx.txt(xxx是数字),文件大小不一样m(m>1000).我想用c读字节,首先:1)怎样在c中知道n是多少? m怎样求?
2)怎样在可变的文件名中用程序自动读?
构想用循环数做字符串代替文件名做循环,不知怎样做请大家帮忙!!!!我想用别的方式报答!

[赵4老师]

system("dir /b /a-d c:\\*.* >d:\\allfiles.txt"); //读文件d:\\allfiles.txt的内容即C:\\下所有文件的名字 system("dir /b /a-d /s c:\\*.* >d:\\allfilesinsub.txt"); //读文件d:\\allfilesinsub.txt的内容即C:\\下所有文件的名字包含子目录 system("dir /b /ad c:\\*.* >d:\\alldirs.txt"); //读文件d:\\alldirs.txt的内容即C:\\下所有子目录的名字 请记住，能用shell命令获取文件、文件夹信息或者操作文件、文件夹最好用shell命令获取或者操作，而不要用各种API获取或者操作，因为当遇到非法文件夹名或非法文件名或非法文件长度、非法文件日期、压缩文件、链接文件、稀疏文件……等各种意料之外的情况时，API会处理的不全面或陷入死循环，而shell命令不会。

[赵4老师]

_fstat, _fstati64 Get information about an open file. int _fstat( int handle, struct _stat *buffer ); __int64 _fstati64( int handle, struct _stat *buffer ); Function Required Header Compatibility _fstat <sys/stat.h> and <sys/types.h> Win 95, Win NT _fstati64 <sys/stat.h> and <sys/types.h> Win 95, Win NT For additional compatibility information, see Compatibility in the Introduction. Libraries LIBC.LIB Single thread static library, retail version LIBCMT.LIB Multithread static library, retail version MSVCRT.LIB Import library for MSVCRT.DLL, retail version Return Value _fstat and _fstati64 return 0 if the file-status information is obtained. A return value of –1 indicates an error, in which case errno is set to EBADF, indicating an invalid file handle. Parameters handle Handle of open file buffer Pointer to structure to store results Remarks The _fstat function obtains information about the open file associated with handle and stores it in the structure pointed to by buffer. The _stat structure, defined in SYS\STAT.H, contains the following fields: st_atime Time of last file access. st_ctime Time of creation of file. st_dev If a device, handle; otherwise 0. st_mode Bit mask for file-mode information. The _S_IFCHR bit is set if handle refers to a device. The _S_IFREG bit is set if handle refers to an ordinary file. The read/write bits are set according to the file’s permission mode. _S_IFCHR and other constants are defined in SYS\STAT.H. st_mtime Time of last modification of file. st_nlink Always 1 on non-NTFS file systems. st_rdev If a device, handle; otherwise 0. st_size Size of the file in bytes. If handle refers to a device, the st_atime, st_ctime, and st_mtime and st_size fields are not meaningful. Because STAT.H uses the _dev_t type, which is defined in TYPES.H, you must include TYPES.H before STAT.H in your code. Example /* FSTAT.C: This program uses _fstat to report * the size of a file named F_STAT.OUT. */ #include <io.h> #include <fcntl.h> #include <time.h> #include <sys/types.h> #include <sys/stat.h> #include <stdio.h> #include <stdlib.h> #include <string.h> void main( void ) { struct _stat buf; int fh, result; char buffer[] = "A line to output"; if( (fh = _open( "f_stat.out", _O_CREAT | _O_WRONLY | _O_TRUNC )) == -1 ) _write( fh, buffer, strlen( buffer ) ); /* Get data associated with "fh": */ result = _fstat( fh, &buf ); /* Check if statistics are valid: */ if( result != 0 ) printf( "Bad file handle\n" ); else { printf( "File size : %ld\n", buf.st_size ); printf( "Time modified : %s", ctime( &buf.st_ctime ) ); } _close( fh ); } Output File size : 0 Time modified : Tue Mar 21 15:23:08 1995 File Handling Routines See Also _access, _chmod, _filelength, _stat

[litaiming]

谢谢:zhao4zhong1大师!善用系统语言.

[litaiming]

刚才那句话是:擅用