Difference between revisions of "Webbrowser/es"

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* [[Executing External Programs]]
 
* [[Executing External Programs]]
  
[[Category:Tutorials]]
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[[Category:Tutorials/es]]

Revision as of 07:55, 25 September 2012

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Esta página resume varios modos para mosrar paginas HTML desde un programa pascal, que van desde llamar a un navegador externo a la adición de un componente capaz de mostrar una página html en un formulario.

Iniciando un navegador web para mostrar un pagina desde su URL

OpenURL

OpenURL es el modo más simple para arbir cualquier URL. Este procedimiento detecta el navegador por defecto del sistema y abre el URL colocado en su unico parametro. Este puede usar para direcciones de correo electronico con el siguiente formato 'mailto:aname@AnAddress?subject=:::A subject line', y las direcciones web con este formato 'http://' y para archivos con este otro 'file:///'.

uses LCLIntf;
...
OpenURL('http://www.lazarus.freepascal.org');

Encontrando el navegador por defecto del sistema

Every platform has a mechanism for its default platform. The LCL unit lazhelphtml contains a class THTMLBrowserHelpViewer to start a web browser for the LCL help system. You can use its method FindDefaultBrowser to find the default browser and the parameter to start. For example:

uses 
  Classes, ..., LCLProc, LazHelpHTML;

...

implementation

procedure TMainForm.Button1Click(Sender: TObject);
var
  v: THTMLBrowserHelpViewer;
  BrowserPath, BrowserParams: string;
begin
  v:=THTMLBrowserHelpViewer.Create(nil);
  v.FindDefaultBrowser(BrowserPath,BrowserParams);
  debugln(['Path=',BrowserPath,' Params=',BrowserParams]);
  v.Free;
end;

This gives for example under Ubuntu (Linux):

Browser=/usr/bin/xdg-open Params=%s

Under Windows you can get:

Browser=C:\windows\system32\rundll32.exe Params=url.dll,FileProtocolHandler %s

Iniciando un navegador

Once you know the command line and parameters you can use TProcessUTF8 to start the browser:

uses 
  Classes, ..., LCLProc, LazHelpHTML, UTF8Process;

...

implementation

procedure TMainForm.Button1Click(Sender: TObject);
var
  v: THTMLBrowserHelpViewer;
  BrowserPath, BrowserParams: string;
  p: LongInt;
  URL: String;
  BrowserProcess: TProcessUTF8;
begin
  v:=THTMLBrowserHelpViewer.Create(nil);
  try
    v.FindDefaultBrowser(BrowserPath,BrowserParams);
    debugln(['Path=',BrowserPath,' Params=',BrowserParams]);

    URL:='http://www.lazarus.freepascal.org';
    p:=System.Pos('%s', BrowserParams);
    System.Delete(BrowserParams,p,2);
    System.Insert(URL,BrowserParams,p);

    // start browser
    BrowserProcess:=TProcessUTF8.Create(nil);
    try
      BrowserProcess.CommandLine:=BrowserPath+' '+BrowserParams;
      BrowserProcess.Execute;
    finally
      BrowserProcess.Free;
    end;
  finally
    v.Free;
  end;
end;

Integrando un componente navegador web "web browser" en una aplicación

Usando el control "Turbopower Internet pro"

Lazarus provides the package TurboPowerIPro (lazarus/components/turbopower_ipro/turbopoweripro.lpk) with the following features:

  • It contains a control to put onto a form. When you install the package in the IDE, you get some new components in the palette, so you can drop them onto a form just like any LCL control.
  • It is written completely in pascal and therefore works on all platforms out of the box without any extra installation.
  • You have the full control, what files/urls are opened.
  • It does not have all the features of a full webbrowser. No multimedia stuff, javascript or flash. This must be implemented by you.

There are some examples in lazarus/components/turbopower_ipro/examples demonstrating how to open a local html file with some images, hyperlinks and history buttons.

QT Webkit

When using the Qt WidgetSet, you can use the Qt WebKit to embed a browser into a LCL form.

Lazarus LCL/Qt WebKit Demo available on FPC Qt4 Binding Web Page

THtmlPort

THtmlPort is a Lazarus/Free Pascal version of Dave Baldwin's HTML Components, including THtmlViewer, TFrameViewer and TFrameBrowser.

GeckoPort

GeckoPort is a Lazarus/Free Pascal version of Takanori Ito's Gecko SDK for Delphi, including the TGeckoBrowser component.

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