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//using  system.runtime.interopservices;  [structlayout（layoutkind.sequential,  charset=charset.auto）]     public  struct  internet_cache_entry_info     ...{    public  int  dwstructsize;      public  intptr  lpszsourceurlname;      public  intptr  lpszlocalfilename;      public  int  cacheentrytype;      public  int  dwusecount;      public  int  dwhitrate;      public  int  dwsizelow;      public  int  dwsizehigh;      public  filetime  lastmodifiedtime;      public  filetime  expiretime;      public  filetime  lastaccesstime;      public  filetime  lastsynctime;      public  intptr  lpheaderinfo;      public  int  dwheaderinfosize;      public  intptr  lpszfileextension;      public  int  dwexemptdelta;     }   [dllimport（"wininet.dll",  setlasterror=true,  charset=charset.auto）]    public  static  extern  intptr  findfirsturlcacheentry（[marshalas（unmanagedtype.lptstr）]  string  urlsearchpattern,  intptr  lpfirstcacheentryinfo,  ref  int  lpdwfirstcacheentryinfobuffersize）;   [dllimport（"wininet.dll",  setlasterror=true,  charset=charset.auto）]     public  static  extern  bool  geturlcacheentryinfo（    [marshalas（unmanagedtype.lptstr）]  string  lpszurlname,    intptr  lpcacheentryinfo,    ref  int  lpdwcacheentryinfobuffersize    ）;  public  static  string  getcatchfilename（string  url）  ...{  int  nneeded  =  0,  nbufsize;      intptr  buf;    findfirsturlcacheentry（  null,  intptr.zero,  ref  nneeded  ）;   nbufsize  =  nneeded;     buf  =  marshal.allochglobal（  nbufsize  ）;      geturlcacheentryinfo（url,buf,ref  nneeded）;    internet_cache_entry_info  cacheitem;  geturlcacheentryinfo（url,buf,ref  nneeded）;  cacheitem  =  （internet_cache_entry_info）  marshal.ptrtostructure（  buf,typeof（internet_cache_entry_info）  ）;       string  res=marshal.ptrtostringauto（cacheitem.lpszlocalfilename）;  return（res）;  }