using System.Runtime.InteropServices;

namespace Falcon.SugarApi.Windows
{
    /// <summary>
    /// 文件操作扩展
    /// </summary>
    public static class FileExtend
    {
        [DllImport("kernel32.dll")]
        private static extern IntPtr _lopen(string lpPathName,int iReadWrite);

        [DllImport("kernel32.dll")]
        private static extern bool CloseHandle(IntPtr hObject);

        /// <summary>
        /// 判断文件是否打开，并可选是否关闭
        /// </summary>
        /// <param name="path">文件路径</param>
        /// <param name="close">True关闭文件，不关闭。默认不关闭</param>
        /// <returns>True文件打开，False文件没有打开</returns>
        public static bool IsOpen(this string path,bool close = false) {
            if(!File.Exists(path)) {
                return false;
            }
            var handle = _lopen(path,2|0x40);
            if(handle==new IntPtr(-1)) {
                return true;
            }
            if(close) {
                CloseHandle(handle);
            }
            return false;
        }
    }
}