FindFirst (Delphi) vs Dir * /s

[MikeZ87 1]

Hi Group,

 

Here's a weird one. I'm trying to count all of the files on a drive, so I'm doing a FindFirst('C:\*', faAnyFile, yadda yadda yadda) and counting the files [NOT directories,] and it's finding (exactly) 2184843 files. When I do a dir c:\* /s, it's finding (exactly) 1229974 files. (dir is also reporting 990877 directories.) Either way, these numbers aren't adding up.

 

Any thought on what's going on?

 

var
   MyTotal : Int64;  //This gets set to 0 in the button.click code when FileSearch is initially run.

procedure TForm1.FileSearch(const dirName:string);
var
  searchResult: TSearchRec;

begin
     if FindFirst('C:\*', faAnyFile, searchResult)=0 then begin
        try
           repeat
                 MyTotal := MyTotal + 1;
                 if (searchResult.Attr and faDirectory)=0 then begin
                    //do stuff
                 end else if (searchResult.Name<>'.') and (searchResult.Name<>'..') then begin
                     FileSearch(IncludeTrailingBackSlash(dirName)+searchResult.Name);
                 end;
           until FindNext(searchResult)<>0
        finally
               FindClose(searchResult);
        end;
     end;
end;

 

[corneliusdavid 214]

dir c:\* /s

This is probably filtering out hidden and system files while FindFirst does not.

[Attila Kovacs 629]

     if FindFirst('C:\*', faAnyFile, searchResult)=0 then begin

yadda yadda yadda:

     if FindFirst(dirName, faAnyFile, searchResult)=0 then begin

yadda yadda yadda, yadda yadda?

 

[Remy Lebeau 1392]

1 hour ago, corneliusdavid said:

dir c:\* /s

This is probably filtering out hidden and system files while FindFirst does not.

There are 2 other mistakes in the FindFirst code -

1. It is counting all of the files AND the subdirectories (despite MikeZ87's claim to the contrary) AND the '.' and '..' entries.
2. Every time FileSearch() is called, it is searching the C:\ root again and again. It is not searching the DirName that is passed in.

Try this instead:

var
  MyTotal : Int64;  //This gets set to 0 in the button.click code when FileSearch is initially run.

procedure TForm1.ButtonClick(Sender: TObject);
begin
  MyTotal := 0;
  FileSearch('C:');
end;

procedure TForm1.FileSearch(dirName: string);
var
  searchResult: TSearchRec;
begin
  dirName := IncludeTrailingPathDelimiter(dirName);
  if FindFirst(dirName + '*', faAnyFile, searchResult) = 0 then begin // <-- NOT THE ROOT!
    try
      repeat
        if (searchResult.Attr and faDirectory) = 0 then begin
          Inc(MyTotal); // <-- MOVE HERE!
          //...
        end else if (searchResult.Name <> '.') and (searchResult.Name <> '..') then begin
          FileSearch(dirName + searchResult.Name);
        end;
      until FindNext(searchResult) <> 0;
    finally
      FindClose(searchResult);
    end;
  end;
end;

That being said, I would suggest a slight modification - make FileSearch() be a function that returns the file count, rather than modifying a class member, eg:

procedure TForm1.ButtonClick(Sender: TObject);
var
  TotalFiles : Int64;
begin
  TotalFiles := FileSearch('C:');
  // use TotalFiles as needed...
end;

function TForm1.FileSearch(dirName: string): Int64;
var
  searchResult: TSearchRec;
begin
  Result := 0;
  dirName := IncludeTrailingPathDelimiter(dirName);
  if FindFirst(dirName + '*', faAnyFile, searchResult) = 0 then begin
    try
      repeat
        if (searchResult.Attr and faDirectory) = 0 then begin
          Inc(Result);
          //...
        end else if (searchResult.Name <> '.') and (searchResult.Name <> '..') then begin
          Inc(Result, FileSearch(dirName + searchResult.Name));
        end;
      until FindNext(searchResult) <> 0;
    finally
      FindClose(searchResult);
    end;
  end;
end;

 

Edited May 24 by Remy Lebeau