// ************************************************************************ // ***************************** CEF4Delphi ******************************* // ************************************************************************ // // CEF4Delphi is based on DCEF3 which uses CEF to embed a chromium-based // browser in Delphi applications. // // The original license of DCEF3 still applies to CEF4Delphi. // // For more information about CEF4Delphi visit : // https://www.briskbard.com/index.php?lang=en&pageid=cef // // Copyright © 2023 Salvador Diaz Fau. All rights reserved. // // ************************************************************************ // ************ vvvv Original license and comments below vvvv ************* // ************************************************************************ (* * Delphi Chromium Embedded 3 * * Usage allowed under the restrictions of the Lesser GNU General Public License * or alternatively the restrictions of the Mozilla Public License 1.1 * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for * the specific language governing rights and limitations under the License. * * Unit owner : Henri Gourvest * Web site : http://www.progdigy.com * Repository : http://code.google.com/p/delphichromiumembedded/ * Group : http://groups.google.com/group/delphichromiumembedded * * Embarcadero Technologies, Inc is not permitted to use or redistribute * this source code without explicit permission. * *) unit uEncapsulatedBrowser; {$I cef.inc} interface uses {$IFDEF DELPHI16_UP} System.SyncObjs, System.SysUtils, {$ELSE} SyncObjs, SysUtils, {$ENDIF} uCEFTypes, uCEFBrowserThread; type TEncapsulatedBrowser = class protected FThread : TCEFBrowserThread; FWidth : integer; FHeight : integer; FDelayMs : integer; FScale : single; FSnapshotPath : ustring; FErrorText : ustring; procedure Thread_OnError(Sender: TObject); procedure Thread_OnSnapshotAvailable(Sender: TObject); public constructor Create; destructor Destroy; override; procedure LoadURL(const aURL : ustring); property Width : integer read FWidth write FWidth; property Height : integer read FHeight write FHeight; property DelayMs : integer read FDelayMs write FDelayMs; property Scale : single read FScale write FScale; property SnapshotPath : ustring read FSnapshotPath write FSnapshotPath; property ErrorText : ustring read FErrorText; end; procedure CreateGlobalCEFApp; function WaitForMainAppEvent : boolean; procedure WriteResult; implementation uses uCEFApplication; var MainAppEvent : TEvent; EncapsulatedBrowser : TEncapsulatedBrowser = nil; procedure GlobalCEFApp_OnContextInitialized; var TempParam, TempURL : ustring; begin TempURL := ''; // This demo reads the "/url" parameter to load it as the default URL in the browser. // For example : ConsoleBrowser2.exe /url=https://www.briskbard.com if (ParamCount > 0) then begin TempParam := paramstr(1); if (Copy(TempParam, 1, 5) = '/url=') then begin TempURL := trim(Copy(TempParam, 6, length(TempParam))); if (length(TempURL) > 0) then WriteLn('Loading ' + TempURL); end; end; if (length(TempURL) = 0) then begin TempURL := 'https://www.google.com'; WriteLn('No URL has been specified. Using the default...'); end; EncapsulatedBrowser := TEncapsulatedBrowser.Create; EncapsulatedBrowser.LoadURL(TempURL); end; function WaitForMainAppEvent : boolean; begin Result := True; // Wait for 1 minute max. if (MainAppEvent.WaitFor(60000) = wrTimeout) then begin WriteLn('Timeout expired!'); Result := False; end; end; procedure WriteResult; begin if (EncapsulatedBrowser = nil) then WriteLn('There was a problem in the browser initialization') else if (length(EncapsulatedBrowser.ErrorText) > 0) then WriteLn(EncapsulatedBrowser.ErrorText) else WriteLn('Snapshot saved successfully as ' + EncapsulatedBrowser.SnapshotPath); end; procedure CreateGlobalCEFApp; begin GlobalCEFApp := TCefApplication.Create; GlobalCEFApp.WindowlessRenderingEnabled := True; GlobalCEFApp.ShowMessageDlg := False; // This demo shouldn't show any window, just console messages. GlobalCEFApp.BrowserSubprocessPath := 'ConsoleBrowser2_sp.exe'; // This is the other EXE for the CEF subprocesses. It's on the same directory as this app. GlobalCEFApp.BlinkSettings := 'hideScrollbars'; // This setting removes all scrollbars to capture a cleaner snapshot GlobalCEFApp.OnContextInitialized := GlobalCEFApp_OnContextInitialized; { // In case you use a custom directory for the CEF binaries you have to set these properties // here and in the subprocess GlobalCEFApp.FrameworkDirPath := 'c:\cef'; GlobalCEFApp.ResourcesDirPath := 'c:\cef'; GlobalCEFApp.LocalesDirPath := 'c:\cef\locales'; GlobalCEFApp.SetCurrentDir := True; } GlobalCEFApp.StartMainProcess; end; constructor TEncapsulatedBrowser.Create; begin inherited Create; FThread := nil; FWidth := 1024; FHeight := 768; FDelayMs := 500; FScale := 1; // This is the relative scale to a 96 DPI screen. It's calculated with the formula : scale = custom_DPI / 96 FSnapshotPath := 'snapshot.bmp'; FErrorText := ''; end; destructor TEncapsulatedBrowser.Destroy; begin if (FThread <> nil) then begin if FThread.TerminateBrowserThread then FThread.WaitFor; FreeAndNil(FThread); end; inherited Destroy; end; procedure TEncapsulatedBrowser.LoadURL(const aURL : ustring); begin if (FThread = nil) then begin FThread := TCEFBrowserThread.Create(aURL, FWidth, FHeight, FDelayMs, FScale); FThread.OnError := Thread_OnError; FThread.OnSnapshotAvailable := Thread_OnSnapshotAvailable; FThread.Start; end else FThread.LoadUrl(aURL); end; procedure TEncapsulatedBrowser.Thread_OnError(Sender: TObject); begin // This code is executed in the TCEFBrowserThread thread context while the main application thread is waiting for MainAppEvent. FErrorText := 'Error'; if (FThread.ErrorCode <> 0) then FErrorText := FErrorText + ' ' + inttostr(FThread.ErrorCode); FErrorText := FErrorText + ' : ' + FThread.ErrorText; if (length(FThread.FailedUrl) > 0) then FErrorText := FErrorText + ' - ' + FThread.FailedUrl; if assigned(MainAppEvent) then MainAppEvent.SetEvent; end; procedure TEncapsulatedBrowser.Thread_OnSnapshotAvailable(Sender: TObject); begin // This code is executed in the TCEFBrowserThread thread context while the main application thread is waiting for MainAppEvent. if (FThread = nil) or not(FThread.SaveSnapshotToFile(FSnapshotPath)) then FErrorText := 'There was an error copying the snapshot'; if assigned(MainAppEvent) then MainAppEvent.SetEvent; end; initialization MainAppEvent := TEvent.Create; finalization MainAppEvent.Free; if (EncapsulatedBrowser <> nil) then FreeAndNil(EncapsulatedBrowser); end.