[SOLVED] How to read data from an URL address

Forum > Networking and Web Programming

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sorinr:
Hi all,

Can anybody give me some idea on how to read a value returned by a web page?

So, let me explain my problem:

1. I need to read a value (that in fact is the exchange rate of a currency at a certain date) from a web page like "www.infovalutar.ro/bnr/YYYY/MM/DD/EUR". The web page returns the exchane rate of the currency you select, in my case EUR or it can be USD, CAD whatever.
2. I am using Lazarus 0.9.28 on a win32 machine and i have the Inet package installed.

Thank you in advance for your help

Dibo:
If you have lNET, open visual example of HTTP. There is "how to" read http data from given link. Just put your link.
Or, download and use synapse:
1. Add httpsend to uses section
2. Call:

--- Code: Pascal [+][-]window.onload = function(){var x1 = document.getElementById("main_content_section"); if (x1) { var x = document.getElementsByClassName("geshi");for (var i = 0; i < x.length; i++) { x[i].style.maxHeight='none'; x[i].style.height = Math.min(x[i].clientHeight+15,306)+'px'; x[i].style.resize = "vertical";}};} ---uses httpsend; procedure Button1Click(Sender: TObject); var s: TMemoryStream;begin s := TMemoryStream.Create; try HttpGetText('http://www.infovalutar.ro/bnr/YYYY/MM/DD/EUR', s); s.Position := 0; Memo1.Lines.LoadFromStream(s); finally s.Free; end;end;
Sorry, above code wrong format your link.

sorinr:
Hi Dibo,

Thanks for your reply. I've seen it just before to post the solution I've found using HTTPsend instead of Inet. Here is the code I have used:

procedure TForm1.FormActivate(Sender: TObject);
var
response: Tstringlist;
HTTP: THTTPSend;
result: boolean;
begin
  Response := TStringList.Create;
  HTTP := THTTPSend.Create;
  try
   Result := HTTP.HTTPMethod('GET', 'http://www.infovalutar.ro/bnr/2011/02/13/usd/');
   if Result then
   Response.LoadFromStream(HTTP.Document);
   edit1.Text:=Response[0];
  finally
   HTTP.Free;
  end;

end;

Thanks to all. PROBLEM SOLVED! :D

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