C#调用动态unlha32.dll解压Lha后缀的打包文件分享

public class lhautity
    {
        ///取得dll的版本
        [dllimport("unlha32")]
        private static extern uint16 unlhagetversion();

        /// <summary>
        /// '取得dll的执行情况
        /// </summary>
        /// <returns>是否成功</returns>
        [dllimport("unlha32")]
        private static extern  boolean unlhagetrunning();

        /// <summary>
        /// '文件检查
        /// </summary>
        /// <param name="szfilename"></param>
        /// <param name="imode"></param>
        /// <returns></returns>
        [dllimport("unlha32")]
        private static extern boolean unlhacheckarchive(string szfilename, int32 imode);

        /// <summary>
        /// 文件解压缩
        /// </summary>
        /// <param name="hwnd"></param>
        /// <param name="szcmdline"></param>
        /// <param name="szoutput"></param>
        /// <param name="dwsize"></param>
        /// <returns></returns>
        [dllimport("unlha32")]
        private static extern int unlha(int hwnd, string szcmdline, string szoutput, int dwsize);

        /// <summary>
        /// 需要解压的文件
        /// </summary>
        /// <param name="archivefile">解压文件路径</param>
        /// <param name="extractdir">解压到路径</param>
        /// <param name="isdeletefile">是否删除</param>
        public static bool uncompress(string archivefile, string extractdir,bool  isdeletefile)
        {
            string extractfullpath = string.empty;
            string startpath = appdomain.currentdomain.basedirectory;

            if (!system.io.file.exists(archivefile))
            {
                //判断需要解压的文件存不存
                throw new exception(string.format("需要解压的{0}不存在", archivefile));
            }

            try
            {
                uint16 ver = lhautity.unlhagetversion();
            }
            catch (exception ex)
            {
                throw new exception("没找到unlha32.dll文件");
            }

            if (unlhagetrunning())
            {
                throw new exception("dll正在执行");
            }

            if (!unlhacheckarchive(archivefile, 0))
            {
                throw new exception("文件不能被解压缩");
            }

            //解压的路径
            if (string.isnullorempty(extractdir))
            {
                extractfullpath =string.format(@"{0}{1}\", startpath,archivefile.substring(archivefile.lastindexof("\\")+1,archivefile.indexof(".lha")-1-archivefile.lastindexof("\\")));
            }
            else
            {
                extractfullpath = extractdir;
            }

            if (!system.io.directory.exists(extractfullpath))
            {
                system.io.directory.createdirectory(extractfullpath);
            }
              

            int ret = unlha(0, string.format("x \"{0}\" \"{1}\"", archivefile, extractfullpath), null, 0);

            if (ret != 0)
            {

                if (ret == 32800)
                {
                    throw new exception("文件解压缩取消");
                }
                else
                {
                    throw new exception("文件解压缩异常结束");

                }

            }
            else
            {
                if (isdeletefile)
                {
                    system.io.file.delete(archivefile);
                }

                return true;
            }

        }

}

项目中需要到解压这类型的文件，无从下手，上网看资料发现是日本常用的压缩算法之一，

查了很多资料，都没有好的办法解包，

后来找到这个dll可以解包的

但是网上的代码都是vb或者c的

唯有自己写成c#版本的，其实即使c#调用动态链接库

先到网上下载这个dll，然后把这个dll放到c:\windows\system32目录下