Delphi HTTP Get and HTTP Post Sample Source Code

Network Component provides an easy-to-use development interface to a variety of IP protocols. By using Network Component, you can very easily create or enhance applications with network features.

Network Component features the following: DNS, FTP, HTTP, HTTPs, ICMP Ping, IP-to-Country, MSN, NTP, RSH, SCP, SFTP, SNMP v1/v2c (Get, GetNext, Set), SNMP Traps, SNMP MIB, SSH, TCP, Telnet, TFTP, UDP, Telnet, Wake-On-LAN and more.

Network Component can be well integrated into any development platform that supports ActiveX objects.

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The most important functions of the Http object are:

• Connect - connect to the (remote) HTTP web server on port 80 or any alternate port; optionally, use proxy credentials to use a proxy server; optionally, specify a web account and password for password protected web sites
• Disconnect - to diconnect after a connect call;
• ReadData - read all data from a web page;
• WriteData - write data to a web page.

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Step 1: Download and install the Network Component

Download Network Component from the ActiveXperts Download Site and start the installation. The installation guides you through the installation process.

Step 2: Create a new Delphi Project

Launch Borland Delphi from the Start menu. Choose 'New' from the 'File' menu and select your preferred kind of application, for instance: 'VCL Forms Application - Delphi for Win32'. A new Form is displayed in the workspace.

Step 3: Refer to the Network Component Library and create the objects

Now that a new project has been created, you must add a reference to Network Component in the project to be able to use the Network Component object. To do so, choose 'Import Component...' from the 'Component' menu. The Import Components' dialog appears. Select 'Import a Type Library':

In the 'Registered Type Libraries' page, select 'Network Component 4.4 Type Library' and click 'Next':

In the 'Components' page, leave all fields default and click 'Next':

In the 'Install' page, select 'Create Unit' and click 'Next':

The interface code is generated now and is shown in the AxNetwork_TLB tab of the project.

Step 4: Declare and create the object

From the Project Manager, open Unit1.bas and add the AxNetwork_TLB to the 'Uses' statement to refer to the Network Component library:

In the 'private' or 'public' section, declare the following objects:

objHttp    : IHttp

You can now create the objects, for instance in the 'FormCreate' function:

objHttp     := THttp.Create(Form1).DefaultInterface;

Appendix: Full source code

{******************************************************************************}
{                                                                              }
{                              ActiveXperts                                    }
{                                                                              }
{                  Network Component: Delphi_Console_HTTP                      }
{                                                                              }
{                                                                              }
{                                                                              }
{                                                                              }
{                                                                              }
{                                                                              }
{******************************************************************************}
program HTTPdemo;

{$APPTYPE CONSOLE}

uses
  SysUtils, ActiveX,
  AxNetwork_TLB in '../../Imports/AxNetwork_TLB.pas';


{==============================================================================}
{= R e a d   I n p u t ========================================================}
{==============================================================================}
function ReadInput(strTitle:string;strDefault:string):string;
var
 strInput:string;
begin
 strInput := '';

 writeLn(strTitle);
 Write('  > ');
 ReadLn(strinput);
 if( strInput = '' )then
 strInput := strDefault;

 ReadInput:=strInput;
end;

{==============================================================================}
{==============================================================================}
{= T H E   P R O G R A M   I T S E L F ========================================}
{==============================================================================}
{==============================================================================}
var
 objHTTP:HttpEx;
 strURL, strData:string;

begin
 CoInitialize(nil);

 objHTTP := COHttpEx.Create();

 // A license key is required to unlock this component after the trial period
 // has expired. Assign the LicenseKey property every time a new instance of
 // this component is created (see code below). Alternatively, the LicenseKey
 // property can be set automatically. This requires the license key to be
 // stored in the registry. For details, see manual, chapter
 // "Product Activation".
 {
 objHTTP.LicenseKey = 'XXXXX-XXXXX-XXXXX';
 }

 Writeln('ActiveXperts Network Component ' + objHTTP.Version + sLineBreak +
   'Build: ' + objHTTP.Build + sLineBreak +
   'Module: ' + objHTTP.Module + sLineBreak +
   'License Status: ' + objHTTP.LicenseStatus + sLineBreak +
   'License Key: ' + objHTTP.LicenseKey + sLineBreak);

 strURL := '';
 strData := '';

 {To enable logging,assign a valid log file to the LogFile property}
 // objHttp.LogFile := 'C:\HttpDemo.log';

 strURL := ReadInput( 'Enter a URL. Leave it blank to use an ActiveXperts URL:', 'www.activexperts.com/products' );
 WriteLn('URL: ' + strURL );

 {OPTIONAL: settings for proxy server}
 // objHttp.ProxyServer	:= 'dell04:8080';
 // objHttp.ProxyAccount	:= 'proxyaccount';
 // objHttp.ProxyPassword := 'topsecret';

 {OPTIONAL: settings for password protected web sites}
 // objHttp.WebAccount	:= 'webaccount';
 // objHttp.WebPassword	:= 'Secret';

 strData := objHttp.Get(strURL);
 WriteLn('Connect, result: ' + IntTostr(objHttp.LastError) + ' (' + objHttp.GetErrorDescription(objHttp.LastError) + ')' );
 if( objHttp.LastError = 0 )then
 begin
	WriteLn(strData);
 end;

 WriteLn('Ready.');
 sleep(3000);
 writeln('Done. Press  to close this window');readln;
end.

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You can download the complete samples here. There are many other working Network Component scripts on our site and shipped with the product.