Solved

Downloading an Image

Posted on 2004-05-02
5
293 Views
Last Modified: 2010-04-05
I need to know how to download an image from the web (preferably using Winsock), also I need to be able to download a new image every time (not using cache).

After downloading, either saving to file or loading it into an image box is fine.

Thank you.
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Question by:bolaseal
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5 Comments
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 10974990
Procedure GetNetFile(mURLPath,trgPath:pchar);
var
  nread         : cardinal;
  cnt           : integer;
  etxt          : array [0..1023] of byte;
  mhhtreq       : HINTERNET;
  mhtturl       : HINTERNET;
  my_exe        : file of byte;
  fpath         : string;
  fnm           : string;
begin
 try
  DeleteUrlCacheEntry(mURLPath);
  mhhtreq:=InternetOpen('URName',INTERNET_OPEN_TYPE_PRECONFIG,nil,nil,0);
  try
   mhtturl:=InternetOpenUrl(mhhtreq,mURLPath,nil,0,0,0);
   AssignFile(my_exe,trgPath);
   Rewrite(my_exe);
  repeat
   FillChar(etxt,1024,#0);
   InternetReadFile(mhtturl,@etxt,sizeof(etxt),nread);
   for cnt:=0 to nread-1 do
      Write(my_exe,etxt[cnt]);
  until nread=0;
   CloseFile(my_exe);
  finally
   InternetCloseHandle(mhtturl);
  end;
 finally
    InternetCloseHandle(mhhtreq);
 end;
end;
0
 
LVL 22

Expert Comment

by:Mohammed Nasman
ID: 10975052
Hello

  Try this function

uses URLMon;

function DownloadFile(SourceFile, DestFile: string): Boolean;
begin
  try
    Result :=  UrlDownloadToFile(nil, PChar(SourceFile), PChar(DestFile), 0,nil) = 0;
  except
    Result := False;
  end;
end;


procedure TForm1.Button2Click(Sender: TObject);
begin
  if DownloadFile('http://www.google.com/images/logo.gif'
                  ,'c:\pic.gif') then
    ShowMessage('Done')
  else
    ShowMessage('Errod downloading the file');
end;

Regards,
Mohammed
0
 
LVL 22

Accepted Solution

by:
Mohammed Nasman earned 390 total points
ID: 10975237
and here's another example using Indy idHTTP

procedure TForm1.Button1Click(Sender: TObject);
var
  FS : TFileStream;
  MS : TMemoryStream;
begin
  MS := TMemoryStream.Create;
  Idhttp1.Get('http://www.google.com/images/logo.gif',MS);
  FS := TFileStream.Create('C:\MyPic.gif',fmCreate      );
  Ms.Position := 0;
  FS.CopyFrom(MS,MS.Size);
  FS.Free;
  MS.Free
end;

Regards,
Mohammed
0
 

Author Comment

by:bolaseal
ID: 10983282
Thank you everyone, mnasman, I used your method since the idHTTP control also lets me set custom headers ^_^
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