Info-ZipのUnzip32.dllのAPIを用いて解凍を行うプログラムを作って
いるのですが、サンプルを参考にして下記のようにしてみても、解凍
後のファイルが作成されません。

  m_hUnzipDll = LoadLibrary( "unzip32.dll" );
  if( m_hUnzipDll != NULL ){
  m_pWiz_SingleEntryUnzip = (_DLL_UNZIP)GetProcAddress( m_hUnzipDll, "Wiz_SingleEntryUnzip" );}
  else{ MessageBox( 0, _TEXT("ERROR on LoadLibrary"), 0 ); return;
  }
  m_lpUnzipUserFunctions.password = Password;
  m_lpUnzipUserFunctions.print = DisplayBuf;
  m_lpUnzipUserFunctions.sound = NULL;
  m_lpUnzipUserFunctions.replace = GetReplaceDlgRetVal;
  m_lpUnzipUserFunctions.SendApplicationMessage = ReceiveDllMessage;
  m_lpUnzipUserFunctions.ServCallBk = ServerCallback;
  LPSTR acArchiveName = "C:\\testdir.zip";
  m_lpDcl.ncflag = 1;
  m_lpDcl.fQuiet = 2;
  m_lpDcl.ntflag = 0;
  m_lpDcl.nvflag = 0;
  m_lpDcl.nzflag = 0;
  m_lpDcl.ndflag = 1;
  m_lpDcl.naflag = 0;
  m_lpDcl.nfflag = 0;
  m_lpDcl.noflag = 1;
  m_lpDcl.ExtractOnlyNewer = 0;
  m_lpDcl.PromptToOverwrite = 0;
  m_lpDcl.lpszZipFN = acArchiveName;
  m_lpDcl.lpszExtractDir = NULL;
  (*m_pWiz_SingleEntryUnzip)( 0, NULL, 0, NULL, &m_lpDcl, &m_lpUnzipUserFunctions );
  FreeLibrary( m_hUnzipDll );