Delphi File Downloader Component - delphi

Question

i need a file downloader component for Delphi . may you help me ?

Answer 1

Use the high-level URLDownloadToFile function:
uses UrlMon;
...
URLDownloadToFile(nil, 'http://www.rejbrand.se/', 'C:\Users\Andreas Rejbrand\Desktop\index.html', 0, nil);
Or, you could very easily write your own downloader function using the WinInet functions, something like
uses WinInet;
...
hInet := InternetOpen(PChar(UserAgent), INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
try
hURL := InternetOpenUrl(hInet, PChar('http://' + Server + Resource), nil, 0, 0, 0);
try
repeat
InternetReadFile(hURL, #Buffer, SizeOf(Buffer), BufferLen);
...
There is a lot of sample code here at SO. Use the search box above.
Update
I wrote a small sample. You might want to execute this code in its own thread and let it ping back every 10 kB or so, so that you can provide the user with some progress bar, for instance.
function DownloadFile(const UserAgent, URL, FileName: string): boolean;
const
BUF_SIZE = 4096;
var
hInet, hURL: HINTERNET;
f: file;
buf: PByte;
amtc: cardinal;
amti: integer;
begin
result := false;
hInet := InternetOpen(PChar(UserAgent), INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
try
hURL := InternetOpenUrl(hInet, PChar(URL), nil, 0, 0, 0);
try
GetMem(buf, BUF_SIZE);
try
FileMode := fmOpenWrite;
AssignFile(f, FileName);
try
Rewrite(f, 1);
repeat
InternetReadFile(hURL, buf, BUF_SIZE, amtc);
BlockWrite(f, buf^, amtc, amti);
until amtc = 0;
result := true;
finally
CloseFile(f);
end;
finally
FreeMem(buf);
end;
finally
InternetCloseHandle(hURL);
end;
finally
InternetCloseHandle(hInet);
end;
end;

Answer 2

You can also make this with Indy :
procedure DownloadHTTP(const AUrl : string; DestStream: TStream);
begin
with TIdHTTP.Create(Application) do
try
try
Get(AUrl,DestStream);
except
On e : Exception do
MessageDlg(Format('Erreur : %s',[e.Message]), mtInformation, [mbOK], 0);
end;
finally
Free;
end;
end;
If you want quick download, you can also use Clever Internet Suite