把短文件名(dos 8.3)转换成长文件名代码,Delphi代码库,德仔网

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【Delphi】把短文件名(dos 8.3)转换成长文件名

作者:jellyvice / 发布于2013/12/3/ 403

function ShortToLongFilePath(const FilePath: string): string;
var
 PrevPath: string;     // path before last file/dir in FilePath
 ExpandedName: string;   // long form of file name
 SR: SysUtils.TSearchRec; // record used by file find functions
 Success: Integer;     // indicates success in finding a file
 // ---------------------------------------------------------------------------
 function CountPathDelims(const Name: string): Integer;
  {Counts path separators in given name}
 var
  Idx: Integer; // loops thru name string
 begin
  Result := 0;
  for Idx := 1 to Length(Name) do
   if SysUtils.IsPathDelimiter(Name, Idx) then
    Inc(Result);
 end;

 function IsServerName(const Name: string): Boolean;
  {Returns true if Names is in form \\Server\Share}
 begin
  Result := (SysUtils.AnsiPos('\\', Name) = 1)
   and (CountPathDelims(Name) = 3);
 end;
 // ---------------------------------------------------------------------------
begin
 // Check if we have a drive, server/share or root path, and exit if so
 // (we can't apply file search to any of these, so we return them unchanged
 if (FilePath = '')
  or (FilePath = '\')
  or ((Length(FilePath) = 2) and (FilePath[2] = ':'))
  or ((Length(FilePath) = 3) and (FilePath[2] = ':') and (FilePath[3] = '\'))
  or IsServerName(FilePath) then
 begin
  Result := FilePath;
  Exit;
 end;
 // Do a file search on file: this is used to expand name
 Success := SysUtils.FindFirst(FilePath, SysUtils.faAnyFile, SR);
 try
  if Success = 0 then
   ExpandedName := SR.FindData.cFileName
  else
   ExpandedName := '';
 finally
  SysUtils.FindClose(SR);
 end;
 // Check if there's any part of path we've not handled, and convert it if so
 PrevPath := SysUtils.ExtractFileDir(FilePath);
 if PrevPath <> '' then
 begin
  // We have unprocessed part of path: expand that
  Result := ShortToLongFilePath(PrevPath);
  // Appended currently expanded name to path
  if (Result <> '') and (Result[Length(Result)] <> '\') then
   Result := Result + '\';
  Result := Result + ExpandedName;
 end
 else
  // No earlier parts of path: just record expanded name
  Result := ExpandedName;
end;

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