[delphi] Forum Topics

Dear knowledgeable ones. I started on a project to be able to use a smart card and a smart card reader in order to limit access to a program. I had some sample code written in Visual Basic, and wanted to translate this to Delphi instead, something I think I …

I did an experiment regarding sorting of 256.000 random "names" using TListBox component. A friend of mine say that TListBox is faster than my code at sorting, so I wanted to test this out of curiosity. Method of testing. When I have created 256 thousand random textstrings, each 6 characters, …

I did this code to compare to Delphi code in Delphi forum [URL="http://www.daniweb.com/software-development/pascal-and-delphi/threads/357771"]TListBox and sorting[/URL] which ran in my computer compiled in free Lazarus environment at time 7,235 s for generate and insert to listbox, 13,265 s sorting the listbox.

I am designing a lot of TCheckBox at runtime, and uses mathematical formulas for placing these in columns and rows afterwards on a form. I assign an on click event that is exactly the same on all of them, and everything work, except... Color. My OnClick event is made like …

Any ideas on detecting the current version of the MySQL ODBC driver? Currently I am reading the registry to obtain the version: [code=delphi] Function MySQLVersion:String; Var TR : TRegistry; SL : TStringList; I : Integer; Begin Result := 'ODBC 3.51'; // Default version SL := TStringList.Create; TR := TRegistry.Create; TR.RootKey …

Hello, I am currently using Delphi Prism to try and extract file properties. Below is the code I am currently using which should work, however, the compiler generates an error: Error 1 (PE190) "DSOFile.OleDocumentProperties" is an interface and cannot be instantiated C:\Users\Zumla\Desktop\Comp4\.Net Project\Computing4\Computing4\Main.pas 114 63 Computing4 Help would be much …

Hi, Does anyone know a simple way of extracting file information such as that shown in the details tab of file properties? I am new to Delphi and I don't have much experience, codes on the internet which I have found are not very helpful and only successfully extract file …

Hi Everyone, I am having some trouble with the libmysql.dll file in Delphi 7. When I try to connect to a database with the dbexpress MySQL driver, i get the error "Unable to load libmysql.dll". I have tried the following to resolve my problem: [LIST] [*]installing different versions of MySQL …

This seems to work well until I try to create the 11th button. Any suggestions? [CODE] procedure TForm1.FormClick(Sender: TObject); var nb: TButton; begin Inc(n); nb := TButton.Create(Self); nb.OnClick := ButtonClick; SetLength(ca, n); ca[n] := nb; ca[n].Left := 8; ca[n].Top := (((n - 1) * nb.Height) + 8); ca[n].ParentWindow := Form1.Handle; …

hi!I have a problem. There's the Access database embedded into dbrid using ADO. In db there is a list of goods,quantity and countries where goods were produced Now I have to build a diagram for db, for example for countries. It works quite well but the diagram shows EVERY good, …

Hi, I want to sort a TStringList but not by the strings in it, but by the Objects. Here's my code: [CODE]var i : integer; iCount : integer; idxFound : integer; someText : string; s : TStringList; oneWord : string; aux : integer; begin someText := memo_txtfile.text; oneWord := ''; …

SetAutoSubClass() has been deprecated in newer versions of Delphi. Can anyone tell me what to replace it with ? I cannot find it in the Delphi 2009 OLH, nor in the VCL source (Forms).

Hi, I have a fancy animated GIF loader that I want to use in projects, but the problem is that the image is only 48x22. Is there some way I can tile the image horizontally to lengthen it? The only solutions I found on the web was with bitmap images. …

If programA starts Delphi programB, is there any way that programB can determine whether it was started by programA or by some other program?

Hi, New to programming. I have three Editboxes and a button - I would like to know how to make Button1.Enabled := true when all editboxes have at least one character of input and := false when even just one of the editboxes has no imput in it - is …

Hi, I have PIC32MX795F512L. I have used the "USB Host - MCHPUSB - Generic Driver Demo - PIC32 USB Starter Kit II.mcp" Firmware. I am very new to Delphi. So I have copy and paste the code from [URL="http://www.sixca.com/delphi/article/microchip_usb.html"]http://www.sixca.com/delphi/article/microchip_usb.html[/URL] It is working fine. I want to use the UPDATE_LED (change …

I'm in the process of converting a legacy app from D5 to D2009. I'm getting errors on AnsiToNative, NativeToAnsi (both DBTables) and DbiOpenSPParamList (BDE). Apparantly the parameters for these functions have changed. Does anyone here have a ready example on how I should use these in D2009 ? I was …

I hope that you folks can help? I have ten IP cameras strategically located around my property. I capture video from these cameras with no problems. The cameras have the ability to pan and tilt, if I send commands to them. I can send something like the following to the …

Hello everyone, I have been programming in C++ for a while although I am not an expert yet, I would like to take a small break and learn another programming language that's a tad easier and I decided on Delphi. I looked for the stuff I need to no avail, …

I use D7 and I've working with TDBgrid and TStringGrid, but I actually need something more advanced. I need a Grid component which provides using a combobox within a cell, limiting a cell to accept only numbers, inserting a picture into a cell... Is there such a component ?

I've heard of these quite a bit, but am quite unsure of what they are?

Hi, My front end has a Tshape(Cirle) Over a Panel and I am trying to move the circle on the panel and get the X and Y values and send these values through comport for serial communication. However I am able to retrieve the values but the shape is flickering …

Can any one help me to convert this delphi code to C#. class function TShrinkConfig.MyVersion: WORD; var ini: TIniFile; begin ini := TIniFile.Create(gsIniFile); Result := ini.ReadInteger( SHRINK_INI_SETUP_SECTION, SHRINK_INI_MYVERSION, SHRINK_INI_VERSION_1); ini.Free; end; if (not ini.ValueExists(SHRINK_INI_VERSIONS_SECTION, IntToStr(version))) then .... I searched online that TiniFile corresponds to FileStream in C#. But i am …

I am relatively new to delphi. what i am try to do it to open a new form from the main one as a pop-up window, let the user input certain values in there (two integers and a check box), and use these values as parameters in a procedure to …

So I started to work on my last Computer Science project for the school year, a maths tutorial application. I'm a bit stuck with displaying a form to explain a mathematical concept. I decided to make a dynamic form on run-time for each grade which then contains all the available …

I have 6 rows of items in a ListView within 2 columns that are listed like so: [CODE]1 Milk 2 Pepsi 3 Juice 4 Water 5 Coffee 6 Tea[/CODE] I'm trying to make it so when you modify the number in the first column, it will sort the list based …

Hi I am trying to execute a TADODataSet by clicking on a button. As of now. whenever I run my delphi program my TADODataSet automatically activates and runs its corresponding stored procedure in sql. I want to be able to press a button on a form in order to execute …

hi, i was wondering if anyone new much about listviews because i been looking for a bit of code or a custim listview that supports paging abit like a website list were u can select pages 1 to 10 but with a listview so i can limit the items to …

Rapid Application Development has come a long way since the early days of Delphi and Visual Basic in the mid 1990s. I remember those days well, as I immersed myself in Pascal development with the original Delphi back in 1995 and even wrote a couple of books about it. Delphi …

Hi I am using SQL express 2005 and I need to be able to take old data (data inputed two weeks ago or older)from a table in data base A and move it to a table in database B. I have very little experience with SQL so any suggestions will …