复制代码 代码如下:
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