函数 stat() 详解

先看看MSDN的解釋:
stat(): Get status information on a file.
Parameters:
    path:  pointer to a string containing the path of existing file.
    buffer:  pointer to a structure that stores results.
int _stat(
   const char *path,
   struct _stat *buffer 
);
 
結構體 _stat 的定义在 sys\stat.h 裏面,具體內容可自行查看,包括主要的字段為:
st_gid

Numeric identifier of group that owns the file (UNIX-specific) This field will always be zero on Windows systems. A redirected file is classified as a Windows file.

st_atime

Time of last access of file. Valid on NTFS but not on FAT formatted disk drives.

st_ctime

Time of creation of file. Valid on NTFS but not on FAT formatted disk drives.

st_dev

Drive number of the disk containing the file (same as st_rdev).

st_ino

Number of the information node (the inode) for the file (UNIX-specific). On UNIX file systems, the inode describes the file date and time stamps, permissions, and content. When files are hard-linked to one another, they share the same inode. The inode, and therefore st_ino, has no meaning in the FAT, HPFS, or NTFS file systems.

st_mode

Bit mask for file-mode information. The _S_IFDIR bit is set if path specifies a directory; the _S_IFREG bit is set if path specifies an ordinary file or a device. User read/write bits are set according to the file's permission mode; user execute bits are set according to the filename extension.

st_mtime

Time of last modification of file.

st_nlink

Always 1 on non-NTFS file systems.

st_rdev

Drive number of the disk containing the file (same as st_dev).

st_size

Size of the file in bytes; a 64-bit integer for variations with the i64 suffix.

st_uid

Numeric identifier of user who owns file (UNIX-specific). This field will always be zero on Windows systems. A redirected file is classified as a Windows file.

If path refers to a device, the st_size, various time fields, st_dev, and st_rdev fields in the _stat structure are meaningless. Because STAT.H uses the _dev_t type that is defined in TYPES.H, you must include TYPES.H before STAT.H in your code.

 
下面通過一個demo實例來描述下函數的使用。
    1. #include <stdio.h>  
    2. #include <sys/types.h>  
    3. #include <sys/stat.h>  
    4.   
    5. int main(int argc,char *argv[])  
    6. {  
    7.     struct _stat buf;  
    8.     int result = 0;  
    9.     char *filename="D:\\test.txt";//注意分隔符转换  
    10.   
    11.     result = _stat(filename,&buf);  
    12.     if(result == 0){  
    13.         printf("\nFile Infomation\n");  
    14.         printf("file size = [%d]\n",buf.st_size);  
    15.         printf("file dev=[%c]\n",buf.st_rdev+'A');//注意加上大A  
    16.         return 0;  
    17.     }  
    18.     return -1;  

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