Title: FastFindFiles
Question: How you get all files from a medium with efficient code
Answer:
As you all know the TSearchRec you can improve the speed with the trick of a temporary list.
The procedure FindAllFiles locates files in a given directory (folder) and its subdirectories, and adds their complete path to a temporary stringlist.
Note that a recursion is used: FindAllFiles calls itself at the end of the procedure!
I use an function alias, so the SR from TSearchRec is dropped:
normal: FilesList.Add(StartDir + SR.Name);
alias: FilesList.Add(StartDir + searchrecName);
Name holds a string that represents a file name, without path information, also from:
type
TSearchRec = record
Time: Integer;
Size: Integer;
Attr: Integer;
Name: TFileName;
ExcludeAttr: Integer;
FindHandle: THandle;
FindData: TWin32FindData;
end;
So here's the speed snippet:
procedure FindAllFiles(FilesList: TStringList; StartDir, FileMask: string);
var
//SR: TSearchRec;
DirList: TStringList;
IsFound: Boolean;
i: integer;
begin
if StartDir[length(StartDir)] '\' then
StartDir:= StartDir + '\';
{ Build a list of the files in directory StartDir (not the directories!)}
IsFound:= FindFirst(StartDir+FileMask, faAnyFile-faDirectory) = 0;
while IsFound do begin
FilesList.Add(StartDir + searchrecName);
IsFound:= FindNext = 0;
end;
FindClose;
//Build a list of subdirectories
DirList:= TStringList.Create;
IsFound:= FindFirst(StartDir+'*.*', faAnyFile) = 0;
while IsFound do begin
if ((searchrecAttr and faDirectory) 0) and
(searchrecName[1] '.') then
DirList.Add(StartDir + searchrecName);
IsFound:= FindNext = 0;
end;
FindClose;
//Scan the list of subdirectories recursive!
for i:= 0 to DirList.Count - 1 do
FindAllFiles(FilesList, DirList[i], FileMask);
DirList.Free;
end;
procedure StartFileFinder;
var
FilesList: TStringList;
begin
FilesList:= TStringList.Create;
try
FindAllFiles(FilesList, 'D:\franktech\Fishe2006\zuko_ca\','*.*');
fileslist.saveToFile('D:\franktech\Fishe2006\zuko_ca\rec_files.txt');
finally
FilesList.Free;
end;
end;
---------------------------------------
update with a pixel manipulation file routine:
one of the fastest ways to operate with pixels in a rgb or rgba file is the following routine:
if fext='.RGB' then begin
assign(f,filename);
{$i-}
reset(f,1);
blockread(f,dims,4);
{$i+}
if ioresult0 then begin
messagedlg(filename+' not found', mterror,[mbabort],0);
halt(1);
end;
Width:= dims[0]+dims[1]*256;
Height:=dims[2]+dims[3]*256;
getmem(pixels,filesize(f)-4);
blockread(f,pixels^,width*height*3,actread);
closefile(f);
end
type
TColorRGB = packed record
r, g, b: BYTE;
end;
PColorRGB = ^TColorRGB;
TRGBList = packed array[0..0] of TColorRGB;
pRGBList = ^TRGBList;
TTexture=class(tobject)
ID, width, height: integer;
pixels: pRGBlist;
constructor Load(tID:integer;filename:string);
destructor destroy; override;
end;
--------------------------------------------
update with a fast mp3 file player in code:
procedure playMP3(mp3path: string);
var nlength: string;
begin
mciSendString(PChar('open "'+ mp3path +'" alias MP3'), NIL, 0, 0);
//player.handle
mciSendString('play MP3', NIL, 0, 0);
setlength(nlength, 255);
mciSendString('status MP3 length',pchar(nlength), length(nlength), 0);
end;
procedure stopMP3;
begin
mciSendString('stop MP3', 0,0,0);
end;
procedure closeMP3;
begin
mciSendString('close MP3', 0,0,0);
end;