C#调用动态unlha32.dll解压Lha后缀的打包文件分享

  

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