mount 函数挂载的几点说明
当我们在Linux系统的板子上挂载U盘时，会出现，原本在windows上显示正常的文件名，在Linux下全部显示为问号?.
如果需要显示出中文，需要使用uft8模式挂载U盘。
解决中文字符显示问号的方法:
mount /dev/sdb4 /mnt/ho1 -o iocharset=utf8
然而，在程序中，使用mount函数来这样挂载，却出现了问题。
首先，我们看看mount函数的定义：
int mount(const char *source, const char *target, const char *filesystemtype, unsigned long mountflags, const void *data);
source ：设备 /dev/sda等；
target ：挂载点/mnt/usb等；
*filesystemtype："minix","ext2", "msdos", "proc", "nfs", "iso9660" ，“vfat”etc.；
mountflags：MS_MGC_VAL/还有别的参数；
*data：例如：”codepage=936,iocharset=cp936“。
其中:
mountflags 经查阅资料有如下选项:
// MS_RELATIME //(default for Linux >= 2.6.30)
// MS_STRICTATIME //(default for Linux < 2.6.30)
// http://harmattan-dev.nokia.com/docs/library/html/manpages/headers/sys/mount.html
public enum MountFlags : ulong
{
MS_RDONLY = 1, // Mount read-only.
MS_NOSUID = 2, // Ignore suid and sgid bits.
MS_NODEV = 4, // Disallow access to device special files.
MS_NOEXEC = 8, // Disallow program execution.
MS_SYNCHRONOUS = 16, // Writes are synced at once.
MS_REMOUNT = 32, // Alter flags of a mounted FS.
MS_MANDLOCK = 64, // Allow mandatory locks on an FS.
S_WRITE = 128, // Write on file/directory/symlink.
S_APPEND = 256, // Append-only file.
S_IMMUTABLE = 512, // Immutable file.
MS_NOATIME = 1024, // Do not update access times.
MS_NODIRATIME = 2048, // Do not update directory access times.
MS_BIND = 4096, // Bind directory at different place.
}; // End Enum MountFlags : ulong
iocharset=name
Character set to use for converting from Unicode to ASCII. The default is to
do no conversion. Use iocharset=utf8 for UTF8 translations. This requires
CONFIG_NLS_UTF8 to be set in the kernel .config file.
函数返回值:
RETURN VALUES
If successful, mount() returns a value of zero. On failure, it returns -1 and sets errno to one of the following values:
EFAULT
spec or dir is an invalid pointer.
EINVAL
spec or dir contains an invalid character.
ENAMETOOLONG
The length of the spec or dir parameter exceeds PATH_MAX or a path name component is longer than NAME_MAX.
ENOTDIR
spec or dir contains an invalid character.
我在程序中使用的方法如下:
if( mount(pTempDevName,pMyDisk[tTempEmptyOther].mountName,"vfat",0,"-o iocharset=utf8") )
return;
目前为止，使用命令行是能够成功显示中文名的，但是在程序中使用这个函数暂时未成功，仍在探索中...
修改成:
if( mount(pTempDevName,pMyDisk[tTempEmptyOther].mountName,"vfat",0,"iocharset=utf8") )
return;
成功以utf8模式挂载，读取中文字符成功，哦耶...