Search the Community

Hi, Using the VirtualTreeView, an error is raised but why ?. I have recreated a minimal sample to reproduce it. Either my coding does an error (more likely), either the component do it. The problem comes when a node is deleted (only when the deleted node has one sibbling with subnodes) from the OnGetImageIndex event. The event is called with an index greater than avalaible nodes. If someone has an idea ? Delphi 11 + VirtualTree for VCL 2021.09. Thanks a lot, Eddy TestVclVT.zip

Devart rolled out the new Delphi Data Access Components for just released RAD Studio 11 Alexandria with support for Firebird 4 and Apple M1 processors. Devart, a recognized vendor of world-class data connectivity solutions for various data connection technologies and frameworks, presented new versions of Delphi Data Access Components to keep assisting software engineers in developing fast native applications. The key feature of the recently updated products is support for the newly released RAD Studio 11 Alexandria. The release also includes such important enhancements: All Devart Delphi Data Access Components now support Apple M1 processors. Devart became the first vendor of Delphi components with Firebird 4 support. UniDAC now includes new data providers for HubSpot and BigQuery that allow users to connect to these data sources from Delphi or C ++ Builder applications. UniDAC supports the latest version of NexusDB 4.50.27. LiteDAC and UniDAC support a new option - IntegerAsLargeInt, which maps SQLite INTEGER columns to fields of type ftLargeInt. In addition, a new demo project for FastReport FMX is available in all DAC products. To learn more about the recent release, visit: https://blog.devart.com/delphi-data-access-components-for-rad-studio-alexandria.html Delphi Data Access Components are the libraries of components for Delphi developers that provide direct access to multiple databases, and allow developing multi-platform applications in Embarcadero RAD Studio, Delphi, C++Builder, Lazarus, and Free Pascal on Windows, Linux, macOS, iOS, and Android, for both 32-bit and 64-bit platforms. About Devart Devart is one of the leading developers of database tools and administration software, ALM solutions, data providers for various database servers, data integration, and backup solutions. The company also implements Web and Mobile development projects. For additional information about Devart, visit https://www.devart.com/.

Hi, I'm developing an application that needs to scan QR Code. For the GUI design, I'd like to provide the usual scan focus screen with a transparent square inside a rectangle (the screen) like the attached mock-up. I already tried different approaches but not very successful. Any idea how could I design this with FMX ? Thanks

Hi all. I'm on a PC with the Italian language and an Italian true keyboard. In the VCL software, I would like to use the TTouchKeyboard. Is a technical software where I need to force TTouchKeyoard to display US keyboard layout, because chars as [ ] | # etc are mandatory instead of accented èéòàù of specific Italian layout. I've imported the Vcl.Touch.Keyboard.pas in project to add minor graphics changes, which works fine, but I'm not able to understand how to force English layout. I've tried to change CreateKeyboard method to say "use alwyas 'en' but doesn't works. function TCustomTouchKeyboard.CreateKeyboard(const Language: string): Boolean; var Index, RowIndex, ColIndex: Integer; Button: TCustomKeyboardButton; LeftPosition, TopPosition: Integer; KeyboardState: TKeyboardState; KeyboardLayout: TVirtualKeyLayout; Row: TVirtualKeys; FoundCaps: Boolean; _Language: string; begin Result := False; FoundCaps := False; for Index := 0 to FButtons.Count - 1 do FButtons[Index].Free; FButtons.Clear; FDeadKey := VKey(-1, -1); TopPosition := 0; _Language := 'en'; if _Language <> '' then FLanguage := _Language; The result is always: There is a way to force it ?

I am very new in Delphi vcl development. My question might be very armature type but I need your help. Is there any way to install Delphi 10.4 package into Delphi 10.3?

Hi, Which delphi books do you recommend ? Thanks

Good night, I tried some ways here, but I was not successful, I am working in remote access, and I wanted that while I work on my client's machine, a form appears with loading and tals and for me it is transparent to be able to make the settings . Could someone give me a light on the part of appearing for him, and not for me? I am grateful.

Hello Winapi lovers, I would like to have all notify icons (system tray?) in a seperate window. (everthing between taskbar entries and time display) Is that possible at all? Reason: I would run that program to have a OnTop window open that does not close on its own and inform me what icons are avail (usb device, network symbol, programms with their bubble[number], and such....) By default I do minimize TaskBar and having such would make my workflow alot easier! For now I even dont have a starting point. Searching Msdn did not result me any positive clue. I would also accept any pre-made application that do such to not reinvent wheels. Thank you for reading!

Hi, I have a project where I need to get the value of a year in a field so I use DecodeDate( dtDate, Year, Month, Day); where dtDate is a TDateTime variable, Year, Month, Day are Word variables. When I run the code I get an error - 'Constant or type identifier expected'. I've downloaded the example Embarcadero have for using DecodeDate: procedure TfAccounts.Button1Click(Sender: TObject); var Present: TDateTime; Year, Month, Day: Word; begin Present:= Now; System.SysUtils.DecodeDate(Present, Year, Month, Day); Label1.Caption := 'Today is Day ' + IntToStr(Day) + ' of Month ' + IntToStr(Month) + ' of Year ' + IntToStr(Year); end; .. and get this same error. The 'Word' is red-underlines as the error. I have System.SysUtils in the Uses clause: uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, ... etc I have used this same code in a different project and it works with no error. I can't think of why it isn't working in this particular project. Unless some other unit in the Uses clause is causing a problem, although SysUtils comes almost first. Any thoughts would be welcomed.

Hi, friends Im with a little problem. Im trying to create a delphi Dll with a form in RAD Studio, but i don't know how to make it load with DllMain. I want to inject this Dll in a third-party process at runtime after. I created the Dll project with the form without problems, but i can't find nothing good related to "how to load it with DllMain", or at least the tutorials/things i found doesn't helped me (or i'm just dumb ). Can someone help me? Give me some hint or a site/video where i can learn it? Thanks for your time guys! =)

We have open sourced our Deployment Manager to simplify deployment of a large number of files or folders to iOS or Android. https://blog.grijjy.com/2021/02/07/deployman/

Hello, We are looking for a Delphi Object Pascal Developer. Our system is entirely based on it, and some updates are needed. We are located in Morocco but remote work is an option. (Long term project). Please respond if interested.

Hi, I'm experimenting some interface design and came up with the following: I would like to query a BaseClass instance if it supports a given interface, without freeing the class! As the example below, my great grand child class can support an interface, but I don't want to include the class definition ( great grand child class ) in the Base class.. So, by defining interfaces, I can write exactly what I want: TMyFrame = Class( TBaseFrame, {SupportedInterfaces}) In the code below procedure TForm22.Button1Click(Sender: TObject); begin if Supports( fBaseFrameClass, ISupportTask ) then (fBaseFrame as ISupportTask).CheckTask; end; No matter what overload Support method I call, fBaseFrame is freed once the method exits. Is there a way to know if my class instance supports an interface and call the corresponding method without messing ref counting and free the class instance prematurely? unit frm.main; interface uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls; type ISupportTask = Interface ['{3F785F20-7C44-4163-B55C-5EA267C7204E}'] function CheckTask : Boolean; end; ISupportList = Interface ['{9B7D95E1-DA96-475A-9A1C-910CAF99E5F5}'] function ListCount : Integer; End; ISupportItem = Interface ['{ACADFA2F-3500-4ACB-8049-F49FAC38EFB2}'] function SaveItem : Boolean; End; TBaseFrame = Class( TInterfacedObject ) protected fDummy : Boolean; End; TBaseFrameClass = Class of TBaseFrame; TMyFrame = Class( TBaseFrame, ISupportTask, ISupportList, ISupportItem ) public function CheckTask : Boolean; function ListCount : Integer; function SaveItem : Boolean; destructor Destroy; override; End; TForm22 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); procedure FormCreate(Sender: TObject); procedure FormDestroy(Sender: TObject); private { Private declarations } fBaseFrameClass : TBaseFrameClass; fBaseFrame : TBaseFrame; public { Public declarations } end; var Form22: TForm22; implementation {$R *.dfm} procedure TForm22.Button1Click(Sender: TObject); begin if Supports( fBaseFrameClass, ISupportTask ) then (fBaseFrame as ISupportTask).CheckTask; end; { TMyFrame } function TMyFrame.CheckTask: Boolean; begin Result := True; end; destructor TMyFrame.Destroy; begin fDummy := True; inherited; end; function TMyFrame.ListCount: Integer; begin Result := 42; end; function TMyFrame.SaveItem: Boolean; begin Result := False; end; procedure TForm22.FormCreate(Sender: TObject); begin fBaseFrameClass := TMyFrame; fBaseFrame := fBaseFrameClass.Create; end; procedure TForm22.FormDestroy(Sender: TObject); begin fBaseFrame.Free; end; end.

Hi all. I'm getting crazy with old software (Delphi 2006) port to Sydney about AnsiPos of an AnsiString: function TTCPBin01.GetTargetAnswer: AnsiString; begin Result := FTargetAnswer; end; .. .. if AnsiPos('?y', GetTargetAnswer) <> 0 then begin FErrorCode := sigc_None; FErrorMessage := SignalMessage(FErrorCode); Result := qmct_Prog; end GetTargetAnswer return an AnsiString. Also using AnsiPos to check for a substring in the resulting string the compiler notice me: [dcc32 Warning] osTCPBin01.pas(224): W1057 Implicit string cast from 'AnsiString' to 'string'. Placing the mouse cursor on AnsiPos the HINT some time notice me: function (const SubStr: string; const S: string): Integer; Other times notice me: function (const SubStr: AnsiString; const S: AnsiString): Integer; In either case however the compiler notice Implicit cast... Have you any suggestion about? Best regards Silverio Diquigiovanni

Some one is asking for my themes, so I thought its better to create a new post to benefit any one who like them, I called them "Nature" themes, one Nature original theme and one Nature Warm theme, you may use Delphi IDE theme editor (https://github.com/RRUZ/delphi-ide-theme-editor) to apply them: Please click Like if you enjoy it. Nature warm (based on my Nature original theme): File: c0d3r-YW-Nature-warm.theme.xml

Hey guys, so I'm having a problem with my ADO Tables. I have a button in my program that is meant to clear all tables in the database related to the program when clicked but whenever I click it, it gives errors. (no matter how many times I change my code) Could it be a problem with my Data Module or what? (I'm not sure cause my button which saves stuff to the database, works perfectly without a hitch) How could I alleviate this? Code of my data module: const scConnectionString = 'Provider=Microsoft.Jet.OLEDB.4.0;Data Source=%pathtomdb%Racers.mdb;Mode=ReadWrite;Persist Security Info=False;'; var dmRacers: TdmRacers; implementation {%CLASSGROUP 'Vcl.Controls.TControl'} {$R *.dfm} procedure TdmRacers.DataModuleCreate(Sender: TObject); var path:string; begin path:=ExtractFilePath(ParamStr(0)); conToDB.ConnectionString := StringReplace(scConnectionString, '%pathtomdb%', path, []); conToDB.Connected:=True; tbl1660.Active := True; tblXKarts.Active := True; tblTwoPointOne.Active := True; tblMidB.Active := True; tblMidA.Active := True; tblLateModel.Active := True; tblSprints.Active := True; tblV8.Active := True; tblHeavyMetals.Active := True; tblHotrods.Active := True; tblPinkrods.Active := True; tblStockrods.Active := True; tblMinis.Active := True; tblDevelopment.Active := True; end; Code from the form: public { Public declarations } MyCmd:TADOCommand; procedure EmptyTable(tbl:TADOTable;tablename:string); procedure ResetActiveProp(tbl:TADOTable); end; var frmEntry: TfrmEntry; implementation {$R *.dfm} procedure TfrmEntry.ResetActiveProp(tbl: TADOTable); begin tbl.Active := True; end; procedure TfrmEntry.EmptyTable(tbl: TADOTable; tablename: string); var MyCmd: TADOCommand; begin tbl.Active := true; MyCmd.CommandText := 'Delete * from '+tablename; MyCmd.Execute; tbl.Active := false; end; procedure TfrmEntry.bmbClearClick(Sender: TObject); var i:integer; begin cbxGridSelect.ItemIndex:=-1; cbxGridSelect.Text:='Select a class'; edtRacerName.Clear; edtCarNumber.Clear; edtLicenseNum.Clear; i:=MessageDlg('Dialog cleared',mtInformation,[mbOK],0); end; procedure TfrmEntry.bmbClearDBClick(Sender: TObject); var i:integer; begin i:=MessageDlg('Are you sure you want to clear the Racers database? (all current data in the database will be lost.)',mtWarning,[mbOK,mbCancel],0); if i = mrOk then begin //clears entire database with dmRacers do begin EmptyTable(tbl1660,'tbl1660'); EmptyTable(tblXKarts,'tblXKarts'); EmptyTable(tblTwoPointOne,'tblTwoPointOnes'); EmptyTable(tblMidB,'tblMidB'); EmptyTable(tblMidA,'tblMidA'); EmptyTable(tblLateModel,'tblLateModels'); EmptyTable(tblSprints,'tblSprints'); EmptyTable(tblV8,'tblV8'); EmptyTable(tblHeavyMetals,'tblHeavyMetals'); EmptyTable(tblHotrods,'tblHotrods'); EmptyTable(tblPinkrods,'tblPinkrods'); EmptyTable(tblStockrods,'tblStockrods'); EmptyTable(tblMinis,'tblMinis'); EmptyTable(tblDevelopment,'tblDevelopment'); i:=MessageDlg('Database successfully cleared',mtInformation,[mbOk],0); //resets active property of tables ResetActiveProp(tbl1660); ResetActiveProp(tblXKarts); ResetActiveProp(tblTwoPointOne); ResetActiveProp(tblMidB); ResetActiveProp(tblMidA); ResetActiveProp(tblLateModel); ResetActiveProp(tblSprints); ResetActiveProp(tblV8); ResetActiveProp(tblHeavyMetals); ResetActiveProp(tblHotrods); ResetActiveProp(tblPinkrods); ResetActiveProp(tblStockrods); ResetActiveProp(tblMinis); ResetActiveProp(tblDevelopment); end; end else begin i:=MessageDlg('Clear aborted',mtInformation,[mbOk],0); end; end; Example of errors: Thanks in advance for the help! Kind Regards PrimeMinister

Is anyone having problems with Delphi 10.3.3 - getting compiler error messages E2217 : Published field not class or interface type. It occurs against the first (and every subsequent field) in the first class definition in a unit ? This has compiled ok before but now it is driving me mad - any Suggestion as to what is wrong would be welcomed. Dave M

Hello, I get a problem with running RestDebugger on my Windows 10 after it was updated. I get such error: and its stops (not working) It's weird and its on all version I have on my installed from Delphi XE8 to 10.4 . I also download free RestDebugger (tool from embarcadero web page and I get error too but it's bit different) Windows 10 Pro version: 20H2 compilation: 19042.746 Can someone confirm or know solution ? best regards Moskw@

Get the most out of your GPU by writing custom shaders for FireMonkey! https://blog.grijjy.com/2021/01/14/shader-programming/

Check out some of the interesting algorithms and data structures used to create an extremely light-weight XML DOM. https://blog.grijjy.com/2020/10/07/an-xml-dom-with-just-8-bytes-per-node/

Hi all, I'm trying to de-couple the actions lists, with related actions, from a specific form to a data module. These actions will be used so also in other views without duplicate them in every form. The things work BUT they are not cyclic updated. The OnActionUpdate is called only when I click on the assigned graphic button (for example), but I would like that ActionXXX.Enabled si cyclically called as when they are in a form. Some ideas? Best Regards Silverio

Hello people, my name is Edisson Savio and I am interested in implementing DLL libraries in my code. I work with simulation of numerical methods applied to reentry physical problems. I have implemented my actual code in PASCAL language using Class variables as start point. I have sucess in such implementation. Now, I am interested in using DLL libraries and after a research in this topic, my unique idea was based on the work of Marco Cantù in "Bible Delphi 3" and I have implemented in such way. I have created the base unit and the implementation unity, as well as the DLL routine. When I put this one to run, my code doesn´t execute the first implementated routine. I would like to know if there is someone who can help me in this task? I wait for your help, best regards, Edisson Sávio.

Hi all, I'm moving a big project, about 1.500.000 code lines from Delphi 2006 to Syndey, but I'm in trouble with how Syndey destroys objects in program termination. Sample: A very Dummy application with 1 form without any other code than a comment in TForm3.FormDestory to place a breakpoint: unit Unit3; interface uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs; type TForm3 = class(TForm) procedure FormDestroy(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form3: TForm3; implementation {$R *.dfm} procedure TForm3.FormDestroy(Sender: TObject); begin // < placed breakpoint here!!! // end; end. A very simple project with a string assignment to catch the main flow (in S := ''; ) after Application Run: program Project2; uses Vcl.Forms, Unit3 in 'Unit3.pas' {Form3}; {$R *.res} var S: string; begin S := 'asdfasdf'; Application.Initialize; Application.MainFormOnTaskbar := True; Application.CreateForm(TForm3, Form3); Application.Run; S := ''; ; << placed break point here end. In BDS 2006 if I run this code and exit program first break at Form3.FormDestroy, then breaks in main at S := ''. RIGHT ! In Sydney first, break in the main at S := '', then goes to Form3.FormDestry. What has changed so much the Delphi behavior? if I add a Form3.DoubleClick event with Application.Terminate I got also an environment error: [50164E97]{rtl270.bpl } System.Classes.TList.Get (Line 4972, "System.Classes.pas" + 2) + $A [50EBFC4B]{vcl270.bpl } Vcl.AppEvnts.TMultiCaster.GetAppEvents (Line 657, "Vcl.AppEvnts.pas" + 1) + $B [50EBF60E]{vcl270.bpl } Vcl.AppEvnts.TMultiCaster.DoActivate (Line 425, "Vcl.AppEvnts.pas" + 5) + $9 [50E5A73F]{vcl270.bpl } Vcl.Forms.TApplication.WndProc (Line 10617, "Vcl.Forms.pas" + 126) + $C [50181450]{rtl270.bpl } System.Classes.StdWndProc (Line 18021, "System.Classes.pas" + 😎 + $0 [50E5B23F]{vcl270.bpl } Vcl.Forms.TApplication.ProcessMessage (Line 11028, "Vcl.Forms.pas" + 23) + $1 [50E5B282]{vcl270.bpl } Vcl.Forms.TApplication.HandleMessage (Line 11058, "Vcl.Forms.pas" + 1) + $4 [50E5B5B5]{vcl270.bpl } Vcl.Forms.TApplication.Run (Line 11196, "Vcl.Forms.pas" + 26) + $3 [0051E178]{bds.exe } bds.bds (Line 222, "" + 13) + $2 😞 test.7z

Meu nome é Edisson Sávio e eu estou implementando um código em PASCAL pelo Delphi 10.4 da Embarcadero. O meu código é para simulação de problemas físicos de reentrada. Já implementei o código usando o PASCAL avançado do Delphi, estou agora querendo implementar ele usando a ideia de bibliotecas DLL do delphi. Eu li na Bíblia Delphi 3 sua sugestão para implementar DLL's com a criação de duas unities: a unit base e a de implementação mais o código da DLL para chamar as rotinas da implementação. Eu tentei rodar um caso básico e deu erro de "Acess Violation". Eu gostaria de saber se você pode dar dicas de onde eu encontraria este tipo de erro? O problema não me parece ser memória pois eu já testei aumenta-la. Eu fico aguardando seu retorno, obrigado, Edisson Sávio.

Hi Can Someone help me on below i need to make app count down for 1 Year Let Say if i set Date for 2021 Dec 31 need to see to the Set Date How Many Year , months , Days , Hours , Mints, Seconds Left