CreateDir（）这个函数
用法：
CreatDir(AnsiString dir);
dir:你要建立的文件目录名，是Ansi字符串哦
有返回值的：如果操作成功,返回真,否则返回假

这个是api函数马？？？怎么用不了呢

BOOL CreateDirectory(
  LPCTSTR lpPathName,                         // pointer to directory path string
  LPSECURITY_ATTRIBUTES lpSecurityAttributes  // pointer to security descriptor
);
If the function succeeds, the return value is nonzero.

The lpSecurityDescriptor member of the structure specifies a security descriptor for the new directory. If lpSecurityAttributes is NULL, the directory gets a default security descriptor. The target file system must support security on files and directories for this parameter to have an effect.