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mirror of https://github.com/salvadordf/CEF4Delphi.git synced 2024-12-04 09:26:52 +02:00
CEF4Delphi/source/uCEFJson.pas
Salvador Díaz Fau 5430db5601 Update to CEF 84.3.10
Added 2 browser extension demos : HelloWorldExt and PageColorExt
2020-08-04 17:52:09 +02:00

386 lines
12 KiB
ObjectPascal

// ************************************************************************
// ***************************** 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 © 2020 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 <hgourvest@gmail.com>
* 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 uCEFJson;
{$IFDEF FPC}
{$MODE OBJFPC}{$H+}
{$ENDIF}
{$IFNDEF CPUX64}{$ALIGN ON}{$ENDIF}
{$MINENUMSIZE 4}
{$I cef.inc}
interface
uses
{$IFDEF DELPHI16_UP}
System.Classes, System.SysUtils,
{$ELSE}
Classes, SysUtils,
{$ENDIF}
uCEFInterfaces, uCEFTypes, uCEFConstants;
type
TCEFJson = class
public
class function ReadValue(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefValue) : boolean;
class function ReadBoolean(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : boolean) : boolean;
class function ReadInteger(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : integer) : boolean;
class function ReadDouble(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : double) : boolean;
class function ReadString(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ustring) : boolean;
class function ReadBinary(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefBinaryValue) : boolean;
class function ReadDictionary(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefDictionaryValue) : boolean;
class function ReadList(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefListValue) : boolean;
class function Parse(const jsonString: ustring; options: TCefJsonParserOptions = JSON_PARSER_RFC): ICefValue; overload;
class function Parse(const json: Pointer; json_size: NativeUInt; options: TCefJsonParserOptions = JSON_PARSER_RFC): ICefValue; overload;
class function ParseAndReturnError(const jsonString: ustring; options: TCefJsonParserOptions; out errorCodeOut: TCefJsonParserError; out errorMsgOut: ustring): ICefValue;
class function Write(const node: ICefValue; options: TCefJsonWriterOptions = JSON_WRITER_DEFAULT): ustring; overload;
class function Write(const node: ICefDictionaryValue; options: TCefJsonWriterOptions = JSON_WRITER_DEFAULT): ustring; overload;
class function Write(const node: ICefValue; var aRsltStrings: TStringList): boolean; overload;
class function Write(const node: ICefDictionaryValue; var aRsltStrings: TStringList): boolean; overload;
class function SaveToFile(const node: ICefValue; const aFileName: ustring): boolean; overload;
class function SaveToFile(const node: ICefDictionaryValue; const aFileName: ustring): boolean; overload;
class function LoadFromFile(const aFileName: ustring; var aRsltNode: ICefValue; {$IFDEF DELPHI12_UP}encoding: TEncoding = nil;{$ENDIF} options: TCefJsonParserOptions = JSON_PARSER_RFC): boolean;
end;
implementation
uses
uCEFLibFunctions, uCEFApplicationCore, uCEFMiscFunctions, uCEFValue;
class function TCEFJson.ReadValue(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefValue) : boolean;
begin
Result := False;
aValue := nil;
if (aDictionary <> nil) then
begin
aValue := aDictionary.GetValue(aKey);
Result := (aValue <> nil);
end;
end;
class function TCEFJson.ReadBoolean(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : boolean) : boolean;
var
TempValue : ICefValue;
begin
Result := False;
aValue := False;
if ReadValue(aDictionary, aKey, TempValue) and
(TempValue.GetType = VTYPE_BOOL) then
begin
aValue := TempValue.GetBool;
Result := True;
end;
end;
class function TCEFJson.ReadInteger(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : integer) : boolean;
var
TempValue : ICefValue;
begin
Result := False;
aValue := 0;
if ReadValue(aDictionary, aKey, TempValue) and
(TempValue.GetType = VTYPE_INT) then
begin
aValue := TempValue.GetInt;
Result := True;
end;
end;
class function TCEFJson.ReadDouble(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : double) : boolean;
var
TempValue : ICefValue;
begin
Result := False;
aValue := 0;
if ReadValue(aDictionary, aKey, TempValue) and
(TempValue.GetType = VTYPE_DOUBLE) then
begin
aValue := TempValue.GetDouble;
Result := True;
end;
end;
class function TCEFJson.ReadString(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ustring) : boolean;
var
TempValue : ICefValue;
begin
Result := False;
aValue := '';
if ReadValue(aDictionary, aKey, TempValue) and
(TempValue.GetType = VTYPE_STRING) then
begin
aValue := TempValue.GetString;
Result := True;
end;
end;
class function TCEFJson.ReadBinary(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefBinaryValue) : boolean;
var
TempValue : ICefValue;
begin
Result := False;
aValue := nil;
if ReadValue(aDictionary, aKey, TempValue) and
(TempValue.GetType = VTYPE_BINARY) then
begin
aValue := TempValue.GetBinary;
Result := True;
end;
end;
class function TCEFJson.ReadDictionary(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefDictionaryValue) : boolean;
var
TempValue : ICefValue;
begin
Result := False;
aValue := nil;
if ReadValue(aDictionary, aKey, TempValue) and
(TempValue.GetType = VTYPE_DICTIONARY) then
begin
aValue := TempValue.GetDictionary;
Result := True;
end;
end;
class function TCEFJson.ReadList(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefListValue) : boolean;
var
TempValue : ICefValue;
begin
Result := False;
aValue := nil;
if ReadValue(aDictionary, aKey, TempValue) and
(TempValue.GetType = VTYPE_LIST) then
begin
aValue := TempValue.GetList;
Result := True;
end;
end;
class function TCEFJson.Parse(const jsonString: ustring; options: TCefJsonParserOptions): ICefValue;
var
TempJSON : TCefString;
begin
if (GlobalCEFApp <> nil) and GlobalCEFApp.LibLoaded then
begin
TempJSON := CefString(jsonString);
Result := TCefValueRef.UnWrap(cef_parse_json(@TempJSON, options));
end
else
Result := nil;
end;
// json must be a pointer to a UTF8 string
class function TCEFJson.Parse(const json: Pointer; json_size: NativeUInt; options: TCefJsonParserOptions): ICefValue;
begin
if (GlobalCEFApp <> nil) and GlobalCEFApp.LibLoaded and (json <> nil) and (json_size > 0) then
Result := TCefValueRef.UnWrap(cef_parse_json_buffer(json, json_size, options))
else
Result := nil;
end;
class function TCEFJson.ParseAndReturnError(const jsonString : ustring;
options : TCefJsonParserOptions;
out errorCodeOut : TCefJsonParserError;
out errorMsgOut : ustring): ICefValue;
var
TempJSON, TempError : TCefString;
begin
if (GlobalCEFApp <> nil) and GlobalCEFApp.LibLoaded then
begin
CefStringInitialize(@TempError);
TempJSON := CefString(jsonString);
Result := TCefValueRef.UnWrap(cef_parse_jsonand_return_error(@TempJSON, options, @errorCodeOut, @TempError));
errorMsgOut := CefStringClearAndGet(@TempError);
end
else
begin
errorCodeOut := JSON_NO_ERROR;
Result := nil;
errorMsgOut := '';
end;
end;
class function TCEFJson.Write(const node: ICefValue; options: TCefJsonWriterOptions): ustring;
begin
if (GlobalCEFApp <> nil) and GlobalCEFApp.LibLoaded and (node <> nil) then
Result := CefStringFreeAndGet(cef_write_json(CefGetData(node), options))
else
Result := '';
end;
class function TCEFJson.Write(const node: ICefDictionaryValue; options: TCefJsonWriterOptions): ustring;
var
TempValue : ICefValue;
begin
Result := '';
if (node = nil) then exit;
try
TempValue := TCefValueRef.New;
TempValue.SetDictionary(node);
Result := Write(TempValue, options);
finally
TempValue := nil;
end;
end;
class function TCEFJson.Write(const node: ICefValue; var aRsltStrings: TStringList): boolean;
var
TempJSON : ustring;
begin
Result := False;
if (aRsltStrings <> nil) then
begin
TempJSON := Write(node, JSON_WRITER_PRETTY_PRINT);
if (length(TempJSON) > 0) then
begin
aRsltStrings.SetText(@TempJSON[1]);
Result := True;
end;
end;
end;
class function TCEFJson.Write(const node: ICefDictionaryValue; var aRsltStrings: TStringList): boolean;
var
TempJSON : ustring;
begin
Result := False;
if (aRsltStrings <> nil) then
begin
TempJSON := Write(node, JSON_WRITER_PRETTY_PRINT);
if (length(TempJSON) > 0) then
begin
aRsltStrings.SetText(@TempJSON[1]);
Result := True;
end;
end;
end;
class function TCEFJson.SaveToFile(const node: ICefValue; const aFileName: ustring): boolean;
var
TempJSON : TStringList;
begin
Result := False;
TempJSON := nil;
try
try
TempJSON := TStringList.Create;
if Write(node, TempJSON) then
begin
TempJSON.SaveToFile(aFileName);
Result := True;
end;
except
on e : exception do
if CustomExceptionHandler('TCEFJson.SaveToFile', e) then raise;
end;
finally
if (TempJSON <> nil) then FreeAndNil(TempJSON);
end;
end;
class function TCEFJson.SaveToFile(const node: ICefDictionaryValue; const aFileName: ustring): boolean;
var
TempJSON : TStringList;
begin
Result := False;
TempJSON := nil;
try
try
TempJSON := TStringList.Create;
if Write(node, TempJSON) then
begin
TempJSON.SaveToFile(aFileName);
Result := True;
end;
except
on e : exception do
if CustomExceptionHandler('TCEFJson.SaveToFile', e) then raise;
end;
finally
if (TempJSON <> nil) then FreeAndNil(TempJSON);
end;
end;
class function TCEFJson.LoadFromFile(const aFileName: ustring; var aRsltNode: ICefValue; {$IFDEF DELPHI12_UP}encoding: TEncoding;{$ENDIF} options: TCefJsonParserOptions): boolean;
var
TempJSON : TStringList;
begin
Result := False;
TempJSON := nil;
try
try
if (length(aFileName) > 0) and FileExists(aFileName) then
begin
TempJSON := TStringList.Create;
TempJSON.LoadFromFile(aFileName{$IFDEF DELPHI12_UP}, encoding{$ENDIF});
aRsltNode := Parse(TempJSON.Text, options);
Result := True;
end;
except
on e : exception do
if CustomExceptionHandler('TCEFJson.LoadFromFile', e) then raise;
end;
finally
if (TempJSON <> nil) then FreeAndNil(TempJSON);
end;
end;
end.