mirror of
https://github.com/salvadordf/CEF4Delphi.git
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132 lines
3.6 KiB
ObjectPascal
132 lines
3.6 KiB
ObjectPascal
unit uWebpageSnapshot;
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{$MODE Delphi}
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{$I ..\..\..\source\cef.inc}
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interface
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uses
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{$IFDEF DELPHI16_UP}
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Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes,
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Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ComCtrls, Vcl.ExtCtrls,
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{$ELSE}
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LCLIntf, LCLType, LMessages, Messages, SysUtils, Variants, Classes,
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Graphics, Controls, Forms, Dialogs, StdCtrls, ComCtrls, ExtCtrls,
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{$ENDIF}
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uCEFBrowserThread;
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type
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TWebpageSnapshotFrm = class(TForm)
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StatusBar1: TStatusBar;
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Image1: TImage;
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NavigationPnl: TPanel;
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GoBtn: TButton;
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AddressEdt: TEdit;
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procedure GoBtnClick(Sender: TObject);
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procedure FormCreate(Sender: TObject);
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procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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private
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FThread : TCEFBrowserThread;
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procedure Thread_OnError(Sender: TObject);
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procedure Thread_OnSnapshotAvailable(Sender: TObject);
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end;
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var
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WebpageSnapshotFrm: TWebpageSnapshotFrm;
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// This demo shows how to encapsulate a browser without user interface in a thread.
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// The thread in the uCEFBrowserThread unit has a browser in "off-screen" mode
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// and it takes a snapshot when the browser has loaded a web page.
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// The thread triggers the TCEFBrowserThread.OnSnapshotAvailable when the main thread
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// can copy the snapshot in a bitmap.
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// If there's an error loading the page then TCEFBrowserThread.OnError will be
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// triggered and the error information will be available in the
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// TCEFBrowserThread.ErrorCode, TCEFBrowserThread.ErrorText and
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// TCEFBrowserThread.FailedUrl properties.
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// The TCEFBrowserThread.Create constructor has the default URL, virtual screen size,
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// virtual screen scale and a delay as parameters. The delay is applied after the browser
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// has finished loading the main frame and before taking the snapshot.
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procedure CreateGlobalCEFApp;
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implementation
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{$R *.lfm}
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uses
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uCEFApplication;
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procedure CreateGlobalCEFApp;
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begin
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GlobalCEFApp := TCefApplication.Create;
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GlobalCEFApp.WindowlessRenderingEnabled := True;
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GlobalCEFApp.SetCurrentDir := True;
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end;
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procedure TWebpageSnapshotFrm.GoBtnClick(Sender: TObject);
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begin
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StatusBar1.Panels[0].Text := 'Loading...';
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screen.cursor := crAppStart;
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if (FThread = nil) then
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begin
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FThread := TCEFBrowserThread.Create(AddressEdt.Text, 1024, 768);
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FThread.OnError := Thread_OnError;
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FThread.OnSnapshotAvailable := Thread_OnSnapshotAvailable;
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FThread.SyncEvents := True;
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FThread.Start;
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end
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else
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FThread.LoadUrl(AddressEdt.Text);
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end;
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procedure TWebpageSnapshotFrm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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begin
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if (FThread <> nil) then
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begin
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if FThread.TerminateBrowserThread then
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FThread.WaitFor;
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FreeAndNil(FThread);
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end;
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CanClose := True;
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end;
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procedure TWebpageSnapshotFrm.FormCreate(Sender: TObject);
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begin
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FThread := nil;
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end;
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procedure TWebpageSnapshotFrm.Thread_OnError(Sender: TObject);
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begin
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StatusBar1.Panels[0].Text := 'Error ' + inttostr(FThread.ErrorCode) + ' : ' + FThread.ErrorText + ' - ' + FThread.FailedUrl;
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screen.cursor := crDefault;
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end;
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procedure TWebpageSnapshotFrm.Thread_OnSnapshotAvailable(Sender: TObject);
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var
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TempBitmap : TBitmap;
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begin
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TempBitmap := nil;
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screen.cursor := crDefault;
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if (FThread <> nil) and FThread.CopySnapshot(TempBitmap) then
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begin
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Image1.Picture.Assign(TempBitmap);
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StatusBar1.Panels[0].Text := 'Snapshot copied successfully';
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TempBitmap.Free;
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end
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else
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StatusBar1.Panels[0].Text := 'There was an error copying the snapshot';
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end;
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end.
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