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Great Reads

Fixing Delphi's Interface Limitations

by Chad Z. Hower aka Kudzu

Delphi has some big gotchas with interfaces. Learn how to bypass them.

HotPoints - A New Method for 2D Polyline Vertex Smoothing

by ADMGNS

An alternative method to Catmull-Rom, Chaikin or Bezier curve smoothing methods

Native (Delphi) callbacks in .NET (C#) COM assembly

by Issam Ali

How to pass native (Delphi) callback pointer to a .net COM assembly

DFM-serialization in depth

by Denis Murashov

In the article I describe the possibilities of standard Delphi DFM-serialization mechanism. I start from the basics and then try to cover more complex situations.

Latest Articles

Smart Decimation: Polyline Simplification and Smoothing

by ADMGNS

A new method for 2D polyline simplification and also smoothing that alternative to Douglas-Peucker and curvature-based simplification algorithms

by ADMGNS

Very simple, noise-based color visual cryptography for images

How to Integrate a Python script in Pascal Program

by Max Kleiner

We use a Command Line Interface with OpenWeatherMap (PyOWM) to make it easier to use the OpenWeatherMap API in Python.

HotPoints - A New Method for 2D Polyline Vertex Smoothing

by ADMGNS

An alternative method to Catmull-Rom, Chaikin or Bezier curve smoothing methods

All Articles

Delphi

Converting Delphi Comport Code to Vb.net

23 Jul 2023 by Moseur

Hello Dear All,I am facing a problem with convert delphi code to vb.net... any body help me to get the solution please... please check the code belowm_arTxBfx:Array [0..255] of Byte; //Output Bufferm_arRxBfx:Array [0..255] of Byte; //Input...

How do I fix the enter key in delphi if everytime I press it, it doesn't create a new line and instead goes to the next codes line

27 Apr 2023 by Francin Okumbe

Everytime I click on my enter key on a program it goes to the next codes line instead of creating a new one on its own What I have tried: I tried using YouTube to help but it didn't work,I searched the internet but got nothing and I tried...

How do I fix the enter key in delphi if everytime I press it, it doesn't create a new line and instead goes to the next codes line

27 Apr 2023 by OriginalGriff

Make sure you have INSERT turned on - if you don't, it overwrites the newline at the EOL with a new, fresh, exactly-the-same one.

How can you hide a string grid

13 Oct 2022 by Chanice Grant

I want to hide the string grid until called apon by a button. There is a property for StringGrid.Visible but it doesn't do anything What I have tried: procedure TfrmMarvelM.FormCreate(Sender: TObject); // Form create begin ...

Matlab ismember function implementation in C++

28 Sep 2022 by Moharram

hi I want to implement Matlab ismember function in C++ or Delphi, but the result is more time consuming than Matlab result! is there any idea? thanks What I have tried: As I said, the Matlab output is more faster than my implementation in...

Matlab ismember function implementation in C++

23 Sep 2022 by merano99

After multiple timings with 64 bit release code, I get times between 3us and 4us for the example. I would be interested to know if the C++ solution takes longer and secondly how long Matlab takes. Here is my test program call with the...

Insert new line when press enter in code window

28 Aug 2022 by wedagedara

Hi all,Am new to delphi.I have installed delphi and and when i press enter key in a middle of a code, it dose not insert a new line. instead, courser is going to the next line of the code.How to resolve it?Thank you

Smart Decimation: Polyline Simplification and Smoothing

6 Aug 2022 by ADMGNS

A new method for 2D polyline simplification and also smoothing that alternative to Douglas-Peucker and curvature-based simplification algorithms

Cannot Make A Visible Window Modal error using 'form.showmodal' method

23 Jul 2022 by Winston_D

I am trying to make a multiforms application by having only the main form created on start up and creating each new additional form dynamically as needed by creating that form object, using it as a modal and once that form's purpose is complete, it is freed from memory after it is closed. Only...

Cannot Make A Visible Window Modal error using 'form.showmodal' method

23 Jul 2022 by Paul UK 15715833

I was getting the same error. Took ages to resolve. At some point, I had accidentally set the form property I was going to call modally to Enabled=False, setting back to Enabled=True fixed the issue

Please help me with programming this in delphi(pascal)

20 Apr 2022 by Patrice T

Quote: i am still new to programming and i do not understand how to do this task First step : find documentation about this topic and read it. Then solve the problem by hand with sample datasets. Choose bigger datasets as you progress. This...

Please help me with programming this in delphi(pascal)

20 Apr 2022 by Member 15608247

The chromatic number of an undirected graph is the minimal number colors in which it is possible to color the vertices of the graph in such a way that the vertices connected by an edge the tops were painted in different colors. Determine the...

Please help me with programming this in delphi(pascal)

19 Apr 2022 by OriginalGriff

While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for...

Byte array into SQL file table from delphi

13 Apr 2022 by avianrand

I've done this many times in vb.net and thought I had it working in Delphi but I'm stuck. I'm using Delphi 10.2. I'm reading a PDF file into a memory stream and then converting it to a byte array so I can store it in an MS SQL file table. I...

Byte array into SQL file table from delphi

13 Apr 2022 by avianrand

Well never mind I guess. On a whim I decided to just use TBytes and the whole solution works now.

How to get the checked items

15 Mar 2022 by JerryMallett

I'm a Delphi Dabbler Using Delphi XE8 and a TListView This has probably been asked before but none of the answers I've seen helped. I have a list of websites. 2 columns. i.e SHORTNAME URL SLACK www.slack.com ZOOM www.zoom.com etc. I...

How to get the checked items

15 Mar 2022 by Maciej Los

I think you've overcomplicated this... If you want to add only url address from currently selected item, use something like this: var ci : Integer; //later ci := ListViewURL.ItemIndex; Memo1.Lines.Add(ListViewURL.Items[ci].SubItems[1].Text);

Explanation of a binary function written in pascal?

17 Jan 2022 by Member 9439045

Hello This function is written using Pascal software. Someone can guide what this function does? Thanks .. procedure int2Hex(intnum:integer; var Bytes:Tsb8); var b,b1,b2,b3,b4,b5,b6,b7,b8:byte; n:integer; begin n:= intnum; b:=n; b8:=b...

Explanation of a binary function written in pascal?

17 Jan 2022 by CPallini

public static byte [] getNibbles(UInt32 ui32) { const int Nibbles = 8; byte [] b = new byte[Nibbles]; for ( int n=0; n>= 4; } return b; }

Explanation of a binary function written in pascal?

17 Jan 2022 by OriginalGriff

All it does is mask and shift values: Look up the AND and shr operators and it's pretty obvious: Pascal - Bit Operators[^]

How would I go about clearing a string grid?

26 Dec 2021 by 0x01AA

Try this: var OldRowCount: integer; OldRowCount:= sgdDisplay.RowCount; sgdDisplay.RowCount:= sgdDisplay.FixedRows; sgdDisplay.RowCount:= OldRowCount; I hope it helps.

How would I go about clearing a string grid?

26 Dec 2021 by Mickyle Govender

I would like to clear a string grid when a click on a certain button.Without Changing the properties off the stringgird What I have tried: procedure TfrmMain.pnlNewClick(Sender: TObject); var i: Integer; begin for i := 0 to...

NoisyCrypt

25 Oct 2021 by ADMGNS

Very simple, noise-based color visual cryptography for images

Can I display items from a listbox in a richedit in delphi language?

20 Oct 2021 by User 15364063

Assuming you have ListBox1.MultiSelect equals false and are interested only in the currently clicked item, then... Sorry I only know the c++ syntax, but I think should be easy for you to abstract my mixed 'if' example below ;) if...

Can I display items from a listbox in a richedit in delphi language?

20 Oct 2021 by Mickyle Govender

Hi, I would like to click on a item in a listbox and then have the item displayed in a richedit. Thank You What I have tried: procedure TForm1.Button1Click(Sender: TObject); var sItem:string; begin sItem:=ListBox1.Items[0];...

How do I sync audio when playing video at different rate using FFMPEG and SDL

2 Sep 2021 by bazzabahuloo

I managed to get this working for me by making a change in the stream reader thread for Audio when video is playing at anything other than normal speed. I am not sure this is the correct place, but it seems to work well at both high and low...

How do I sync audio when playing video at different rate using FFMPEG and SDL

1 Sep 2021 by bazzabahuloo

Hi I have an AVPlayer written in Delphi using the FFMPEG libraries. This basically implements a video player as per FFPLAY but under Delphi. I want to add variable speed video playback to this player, which is easy on the video side as you...

How to Integrate a Python script in Pascal Program

12 Jul 2021 by Max Kleiner

We use a Command Line Interface with OpenWeatherMap (PyOWM) to make it easier to use the OpenWeatherMap API in Python.

HotPoints - A New Method for 2D Polyline Vertex Smoothing

30 Apr 2021 by ADMGNS

An alternative method to Catmull-Rom, Chaikin or Bezier curve smoothing methods

Help with text files on delphi

18 Apr 2021 by Richard MacCutchan

I suggest you go back to your course notes, or find a decent tutorial on Delphi. Searching for entries in a file means reading each line and comparing two values. In general it is better to read all the entries into a list or array and do in...

Delphi - how to declare iwicbitmapfliprotator ?

28 Jan 2021 by Member 13174280

add wincodec on uses, solve the problem

Coding question about data sructures.

15 Jan 2021 by OriginalGriff

We are more than willing to help those that are stuck: but that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us...

How do I CODE a delphi program that determine the total of the first 10 fibonacci numbers

14 Oct 2020 by Member 14965669

the problem should display the first 10 numbers of a fibonacci What I have tried: unit Numbers; interface uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms,...

How do I CODE a delphi program that determine the total of the first 10 fibonacci numbers

14 Oct 2020 by CPallini

Let me see if there is a place where... Fibonacci sequence - Rosetta Code[^].

How do I open my article ?

8 Sep 2020 by Sandeep Mewara

Hi Vincent, There was a database issue during weekend[^] and few faced issue like you (including me. Your Article is safe and sound. Just clear your browser cache and you will be able to see it. Thanks.

How do I open my article ?

8 Sep 2020 by Vincent Radio

there is an error "404" (Spoon not found) on my Article: VRCalc++ Object Oriented Scripting Language :: Vincent Radio {Adrix.NT} can you help me ? thanks in advance best regards What I have tried: i tried to open my Article: VRCalc++ Object...

How do I open my article ?

8 Sep 2020 by Maciej Los

A proper place to post such of content is here: Bugs and Suggestions[^]

I need help with .pdf to .txt

20 Jul 2020 by KarstenK

You have two main options: use some graphical output of the pdf and apply some OCR library or use some professional pdf-library to parse the pdf file. Here is an example for a pdf library. Both ways arent easy and need some professional skills...

I need help with .pdf to .txt

20 Jul 2020 by OriginalGriff

We aren't a "code conversion" service, and a solution written in C# is unlikely to "port" to Delphi easily, or to produce good code at the end. Instead, you should use the C# app as a specification for producing a new Delphi app from scratch. ...

Can we use popupmenu in FMX?

12 Jul 2020 by Member 13901246

I am developing mobile app in FMX where i need Popupmenu but it is showing disable in ToolPalette i cant use it but in VCL its enabled in ToolPalette and can use it. I just want to know that firemonkey supports Popupmenu or my installation having...

Can you implement a delphi project into an PC startup.

11 Jul 2020 by Vivaan

I want to implement a delphi project i made to my PC/Laptop startup or by using a code or command in my project or other way, open to anything What I have tried: Not anything yet ,want to be open minded and want some advice

Can you implement a delphi project into an PC startup.

11 Jul 2020 by Patrice T

Quote: I want to implement a delphi project No matter the language used, a project endup as an executable, an .exe, just excel.exe, outlook.exe, notepad.exe .... Quote: I want to implement a delphi project i made to my PC/Laptop startup The...

Can you implement a delphi project into an PC startup.

11 Jul 2020 by Richard MacCutchan

See startup add - Google Search[^].

Delphi ongettext and onsettext not updating value in database field

16 May 2020 by gerhardlouis

am a Delphi beginner and are having a problem saving a TimeEdit value to a field that is an integer.The OnGetText procedure works but the OnSetText procedure is not updating the integer field in the database.This is what i have tried so far What...

How to effectively obscure assembliy 's source code in .NET to protect my app

26 Apr 2020 by RickZeeland

In addition to Griffs advice, a well known obfuscator is Dotfuscator[^] and here are some alternatives: obfuscators-for-net-code[^] However, no obfuscator is perfect, and my experience with Dotfuscator is that using reflection will most of the...

How to effectively obscure assembliy 's source code in .NET to protect my app

26 Apr 2020 by HasCode

How do I Prevent (OR make it More Hard) unauthorize decoding my Source code in .Net ? And if there are successful tools to Obscure managed Assembles Code , are they as effective as other Programming Languages Native Compilers when build my...

How to effectively obscure assembliy 's source code in .NET to protect my app

25 Apr 2020 by OriginalGriff

Three things: 1) Obfuscators are available for .NET to render source code pretty much unreadable, or at least very hard to work out. 2) Who says you can't produce .NET apps in native code? Microsoft doesn't: Compiling Apps with .NET Native |...

Geometry for Fun, in Corona Days, 2020

21 Apr 2020 by Yuksel YILDIRIM

Draw Multi Parametrik Shapes in 2D

Delphi executable not finding DLL

11 Feb 2020 by Member 9634058

I have a Delphi program which uses dbexpress to connect to a Firebird database. When I run it on my computer within IDE workks fine. When I place the executable in a sepatare folder with the dbx4fb.dll, which is how I would like to deploy it, it...

Need simple code of ftp server work via network

1 Dec 2019 by n_tar

Hi all ; i need a source Code of windows FTP server; can work via internet; writen in delphi or C# What I have tried: Hi all ; i need a source Code of windows FTP server; can work via internet; writen in delphi or C#

Need simple code of ftp server work via network

1 Dec 2019 by OriginalGriff

Google is your friend: Be nice and visit him often. He can answer questions a lot more quickly than posting them here... A very quick search gave over 22,000,000 hits, and the top one was here: Advanced FTP Server[^] In future, please try to do at least basic research yourself, and not waste...

create and write batch file in inno setup

31 Oct 2019 by Member 14640310

[code] procedure CurStepChanged(CurStep: TSetupStep); var fileName : string; begin // Called at the end of setup if CurStep = ssPostInstall then begin // create the directory and file name fileName := ExpandConstant('{pf}\{#MyAppPublisher}\{#MyAppName}\c3deditor'); ...

create and write batch file in inno setup

31 Oct 2019 by Nirali R shah

Hello, Anyone knows how to create and write batch file in inno setup or Edit batch file in inno setup?

Iisexpress.exe: access violation reading location when calling native code DLL in web app only

23 Oct 2019 by Lev37

I'm calling native code dll (delphi) procedure(parameterless) from asp.net app and getting 'Access violation reading location' exception from iisexpress.exe for that [name].dll. Code works perfectly fine in Windows forms app. delphi dll native code: procedure test() stdcall; begin end;...

TStringGrid not showing UNICODE character set, showing اردو ویکیپیڈیا as ? ?

19 Sep 2019 by iDebD

Hi, I have a TStringGrid; When am writing in the grid, it is showing ????? ????? instead of showing و ویکیپیڈیا .The string which I am setting in TStringGrid is in Unicode, as if I can show it via messagebox;Following code setting unicode string:with frmhook.sg do begin if...

TStringGrid not showing UNICODE character set, showing اردو ویکیپیڈیا as ? ?

19 Sep 2019 by Member 14597783

Remember to check the "font" being used in the TStringGrid. Example: 'MS Sans Serif' does not work!

Insert image on blobfiled mysql

22 Jul 2019 by Member 13174280

Fixed (almost, still a problem with 5 Mb files - eg: 4.987.904 should go smoothly on MEDIUMBLOB instead Lost Connection during query... to understand, already with 2.7 Mb files you has the exception). in MySql { TINYBLOB : maximum length of 255 bytes BLOB : maximum length of...

Insert image on blobfiled mysql

22 Jul 2019 by Member 13174280

MySQL 8 FireDac Components (FDQuery + FDPhyMySqlLink) Table with two field a BLOB and a TINYBLOB The image is 7384 byte When execute the query the error is : [Firedac][Phys][MySql] data too long for column immagine at row 1 from the MySqlWordBench the operation on Field Blob /TinyBlob...

Delphi - actionmainmenubar categories position

15 Jul 2019 by ZanTK

Hi, I'm creating ActionMainMenuBar with Categories dynamically and everything working fine BUT as ActionMainMenuBar align is alBottom when press button with categories they show up below ActionMainMenuBar. It will always try show them below if enough space. Is there any way to set categories...

Can't get a string parameter into a C# WS from delphi client

9 Jul 2019 by Member 14150748

Greetings! I got a silly question, for I'd like to get some aid. I'm practicing the call of Web Services from Delphi7. I'm testing it with a WS made in C# 2010. That is what I got so far: This is the Web Service in C#: public class Service1 : System.Web.Services.WebService { ...

Can't get a string parameter into a C# WS from delphi client

9 Jul 2019 by Member 14150748

Solved. Needed to add a line in Service1.pas Original: initialization InvRegistry.RegisterInterface(TypeInfo(Service1Soap), 'http://tempuri.org/', 'utf-8'); InvRegistry.RegisterDefaultSOAPAction(TypeInfo(Service1Soap), 'http://tempuri.org/%operationName%'); end. New: initialization ...

Delphi and field clear issue

27 Jun 2019 by Member 14514860

hi i face a problem with my codes i use Delphi. i compiled my code but when i insert my test data in all my fields after switch between tabs of program, the all data are cleared. this issue occurred for my Win 7 and Win 10 does not. in the other words, content of some current records are...

Delphi and field clear issue

27 Jun 2019 by OriginalGriff

We can't help you with this: it needs your code (which we don't have) , data (which we also don't have access to), and it needs your code running to try and find out what is going on (which we really, really can't do!) So, it's going to be up to you. Fortunately, you have a tool available to...

Delphi 7 vs. Activex issue

20 Jun 2019 by Member 14150748

Greetings. It's me again. Been trying to solve this thing since almost a month ago. Hope you could give me a hand: I installed Delphi 7, because I need to work in a project for a client. The program is already made by someone else, just gonna need to add new features. It uses third party dlls...

Delphi 7 vs. Activex issue

20 Jun 2019 by Member 14150748

Finally solved. A dll was missing. That one is installed by another application made by the same people who did the one I'm working on. Not sure which one is, I'll try to find out later. We found out about that error because when my boss was working over an empty virtual machine (XP) he...

Delphi 7 vs. Activex issue

18 Jun 2019 by Member 14150748

I made a small project in C# to test the dll using System; using AETK_LIB; //

Delphi 7 vs. Activex issue

17 Jun 2019 by CHill60

Have a look at the SysInternals suite of tools Sysinternals Suite - Windows Sysinternals | Microsoft Docs[^]. I think the one you want is ProcMon - you will be able to tell what the COM object is trying to access and work out exactly what is missing. Also ensure that you are using the right...

How get I the serial number hard disk windows 7 when permision user is standard

2 Jun 2019 by jsc42

Given the caveats in Solutions 1 and 2 above, you can easily get the serial no using MS-DOS. Run a Shell() and collect the stdout using a command like dir c:\. 2>nul: | Find "Volume Serial Number" The result will look like Volume Serial Number is D078-97C2

How get I the serial number hard disk windows 7 when permision user is standard

2 Jun 2019 by mzandi

i want protect of my application .so i read serial number hard drive and compare. the application has good result in mode administrator user but it has bad result in mode standard user. i wrote my application with c#.but for read serial number hard i used of a dll file that i wrote with...

How get I the serial number hard disk windows 7 when permision user is standard

2 Jun 2019 by Dave Kreskowiak

Again, you're existing code isn't going to work because it makes very bad assumptions about how the data is laid out in WMI and cann't reliably return the "boot drive". Also, again, you're making the assumption that every drive even has a serial number. That's not the case. How about trying to...

How get I the serial number hard disk windows 7 when permision user is standard

2 Jun 2019 by RickZeeland

See answer here: c# - Serial number of Hard Disk or Hard Drive - Stack Overflow[^]

Delphi 10.3 FIREDAC connect to mysql 8

28 Apr 2019 by Maciej Los

The error message is self-explanatory... Quote: Library has unsupported architetture[x64]. required[x86] As is stated here: Mysql configuration in Delphi 10.3 - Delphi Language - Programming Languages - IDERA Community[^]... Quote: If you use a 64-bit SQL server, the client DLLs will also be...

Delphi 10.3 FIREDAC connect to mysql 8

28 Apr 2019 by Member 13174280

I have tested on Win32 target platform and win64 The Win10 is 64 bit and MySQL 8 64bit FDConnection FDPhysMySQLDriverLink VedorLib C:\Program Files\MySQL\MySQL Server 8.0\lib\libmysql.dll [FIREDAC][Phys][MySQL] autentication PlugIn caching_sha2_password: cannot be loaded vendor library ...

How do I shuffle large groups of bytes? The procedure must be reversible.

8 Apr 2019 by Bulog

The problem is purely mathematic because they are the dominant combinatorics and probability. It is possible to solve the problem without knowing programming, but it is much easier to solve it by programming. In the following 40 byte group, there are 3 pairs of the same bytes: 248, 195, 38,...

How do I shuffle large groups of bytes? The procedure must be reversible.

8 Apr 2019 by CPallini

I would try this way: for each found pair (starting at index i) choose a random number r and swap the item at index i with the item at (i+r) (with wrap around) unless such item is itself equal to the pair members. In such an infortunate event try with (i+r+1), (i+r+2) ..., until you find a...

Excel sheet as input to software with "generate" click botton and new excel sheet as output

31 Mar 2019 by Aek-Tiesto

Thank you Gerry for the solution I'll give it a try. But what if I want to search for Bx that correspond to Ax that I type ???

Excel sheet as input to software with "generate" click botton and new excel sheet as output

31 Mar 2019 by Aek-Tiesto

Dear programmers, I was looking in the internet for an idea on how to create a software or even if there is any existing regarding my issue, but it ended up on this forum Asking for it!! hope I'm in the right place. without further ado let get to my request. I am working in a company where...

Excel sheet as input to software with "generate" click botton and new excel sheet as output

31 Mar 2019 by Gerry Schmitz

How to Use Excel to Make a Queue | Chron.com[^]

How to identify which child form triggers an common custom event in delphi

28 Feb 2019 by fisadmaster

The solution has been to change the technique from events shared by multiple instances in the same way to the use of the technique with TMethod and TExecute from the child forms to the parents. With this technique you can pass the handle of the parent form and the name of the method to be...

How to identify which child form triggers an common custom event in delphi

28 Feb 2019 by fisadmaster

The scenario is: I have a parent form that creates a child form, in order to communicate between them, a object of the custom event type is created in the parent. The handel of the parent form is passed as a param to the event create procedure. In the child form a custom event type property of...

Delphi fill listbox with all database columns

2 Feb 2019 by CHill60

You are adding extra items instead of passing the stuff as columns. See this example SwissDelphiCenter.ch : ...show Columns in a TListBox using Tabulators of different widths?[^] Once you have set up your tabulators you should be adding your data like this:...

Delphi fill listbox with all database columns

1 Feb 2019 by grantfullen

I have a table CREATE TABLE [main]( [ID] INTEGER PRIMARY KEY AUTOINCREMENT, [Name] TEXT, [Address] VARCHAR, [Phone] VARCHAR, [E-Mail] VARCHAR, [Vin] INTEGER, [Year] VARCHAR, [Make] VARCHAR, [Model] VARCHAR, [Job Hours] FLOAT, [Pictures]...

Delphi fill listbox with all database columns

1 Feb 2019 by grantfullen

Thanks for your help. I do not need to add columns to the list box. I need to add all the information from my database e to to the listbox So no columns in the list box. Just the data . This is a android app so the listbox will scroll.

How do I get the project > options > version info > keys programmatically

18 Dec 2018 by User 10574164

procedure TForm1.FormCreate(Sender: TObject); function ReadVerInfo(const fn: string; var Desc: string; const lv: integer = 0; const ky: string = ''): string; var VerHandle, VerSize : DWORD; ...

How do I get the project > options > version info > keys programmatically

18 Dec 2018 by avianrand

I'm on Delphi RAD Studio 10.2 How do you get the information from the settings in Project > Options > Version Info? I'm talking about the KEYS. Things like "LegalCopyright", "FileDescription", and "Comments" from that? These are stored in the dbproj file but I need to know how to get those key...

How do you use the data from a combobox located from a different form onto another form

3 Nov 2018 by SarahPara

HI everyone i would really appreciate it if you could help me with this problem so i have a huge problem . i need to use the data stored in a combo box from a form which it is stored in to be used in another form. basically im making a roadtrip app at a grade 10 level where on the first form...

How do you use the data from a combobox located from a different form onto another form

3 Nov 2018 by Richard MacCutchan

The same way you pass any information between classes. Create a method in the second form (or an alternative constructor) that takes as its parameter(s) the information that the first form gets from the combobox. See Transferring information between two forms, Part 1: Parent to Child[^].

Ado query filtering problem in delphi

22 Aug 2018 by Jochen Arndt

You just have to know about the SQL syntax. As already mentioned by digimanus you can use AND within WHERE clauses. But you should use parametrised queries to avoid SQL injection - Wikipedia[^] when the data has been entered by users. Such allow also passing data by value instead of string...

Ado query filtering problem in delphi

22 Aug 2018 by rezki_z

HI i have this code its work fine when i search a number inside column I want the same code when i search a name in column and a date inside different column thinks procedure TForm1.sEdit1Change(Sender: TObject); var a :integer; begin IF sEdit1.Text '' then begin...

Flutter Getting Started: Tutorial 5 Grid

21 Jul 2018 by ThatsAlok

Let's explore Flutter Grid view and MediaQuery

In delphi/objectpascal - difference between "procedure somemethod()" and "class procedure somemethod()"

20 Jul 2018 by Peter Turtle

The methods (procedures / functions) without the "class" specifier are normal methods that are a part of any INSTANCE of a class, whereas those with the "class" specifier are methods of the class itself, and not of an INSTANCE of the class.

In delphi/objectpascal - difference between "procedure somemethod()" and "class procedure somemethod()"

20 Jul 2018 by stensrbr

I am having difficulties understanding the difference between the following (similar) procedure definitions. Also I'm wondering how to determine when and why to use the 2nd definition. #1 - Standard routine definition type TFigure = class public function Supports(Operation:...

Filter between 2 dates in 1 column

20 Jul 2018 by rezki_z

Hi this is my code and I don't know where is the problem so help me please to fix it thanks What I have tried: procedure TForm1.Button1Click(Sender: TObject); begin ADODataSet1.Close; ADODataSet1.CommandText...

Filter between 2 dates in 1 column

20 Jul 2018 by Peter Turtle

Your CommandText property should be a complete SQL statement, not just a filter. Either use parameters in the full SQL statement, or use your existing code as a filter.

Fixing Delphi's Interface Limitations

12 Jul 2018 by Chad Z. Hower aka Kudzu

Delphi has some big gotchas with interfaces. Learn how to bypass them.

Delphi Language Progression Suggestions

12 Jul 2018 by Chad Z. Hower aka Kudzu

There are dozens of more things I'd like to see in Delphi, but here I will cover the ones that are easy to implement, yet provide large gains.