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Questions tagged [delphi]

Delphi is a language for rapid development of native Windows, OS X and iOS applications through use of Object Oriented Pascal. The name also refers to the Delphi IDE, which is used to help edit and debug Delphi projects more efficiently.

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0answers
52 views

Animation loop for a sliding puzzle game

I'm building a "sliding puzzle" game. This is the animation code for when you click a Tile. This "loop" function is running all the time. When you click a tile, if it's available to move, I set the "...
2
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2answers
56 views

Dephi: faster way to convert a “dirty” string to a number

How can I make this code faster? the string can contain characters such as ", .?#" and possibly others. ...
0
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1answer
145 views

IsValidEmailAddress

I have created this function for Delphi 10.1 Berlin to validate an email address entered by the user: ...
1
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1answer
114 views

Generic function for loading a function from a DLL library

I am trying to write a generic function for loading a function from a DLL library. I am in no way an expert on DLLs, that is why I ask. We have discussed it first in my Stack Overflow question to ...
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0answers
149 views

Code efficiency check for hangman in Delphi

I recently coded a game of hangman and wanted to know, A: Are there any places it could be more efficient? B: Are there any things that are distinctly wrong with it, since I know people seem to say ...
3
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1answer
623 views

Noughts and crosses bot in Delphi

I hope someone can guide me in a way to make this code more efficient. Please explain the things you do simply because I'm no pro so more complex things I am unlikely to get. If you have issues with ...
1
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1answer
579 views

Enumerating RCData resources from the EXE file which has been launched

I am running Delphi XE6. I recently integrated all of my read-only language INI files into the executables. As a consequence, I need to enumerate RCData resources (and then simply filter out the ...
3
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1answer
2k views

Sending a string from anonymous thread to UI with PostMessage

I am sending a string from an anonymous thread to the UI with PostMessage in the following code: ...
2
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0answers
479 views

Delphi: TFileStream child class with progress event on read/write

i want implement a progress event on TFileStream for read/write operation for assign on it a progress bar. I have create a clild class (...
3
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1answer
1k views

Resumable download with System.net.HTTPClient

This is a Delphi class, based on System.net.HTTPClient with a function for downloading a file from a URL and saving on a filename destination: ...
3
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0answers
3k views

TTimerThread - Threaded timer class

I was inspired by @LU RD's answer to the question: Using VCL TTimer in Delphi console application, and wrote a bit simplified TTimerThread class. By simplified I ...
2
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1answer
724 views

Semi-Reliable Communications Using UDP

I'm writing a communications library for a class. Part of the requirements is that semi-reliable communications, which leads me to this monstrosity: ...
2
votes
1answer
3k views

JPG image resizing

This Delphi (Seattle 10) routine resizes a JPG image if one of its sizes is larger than AMaxDimension pixels, and gives it a compression factor of ...
4
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0answers
73 views

Writing a file sequentially

I've written a procedure which allows serialized writing of a stream. I don't in any way consider this done, but this is the beginning of it. I know there are other implementations out there like this,...
3
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0answers
781 views

Alternative for Float Animations

In the Firemonkey framework of Delphi, there's a feature called Float Animations, which allows you to control real-time "animation" of float values. However, in the VCL framework, this feature is not ...
2
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1answer
673 views

Flipping True or False values to save typing and time

I have a few columns in a DBGrid that I want to hide and show at different times depending on what the user wants to view. Rather than writing the following code; ...
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0answers
226 views

Password Entropy in Lazarus (Delphi-like)

My today's goal was to create a function, which would evaluate the entropy of a given string password. It's mostly about how random the password is. This little code is based on the C# code from Jeff ...
2
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0answers
1k views

LockBox TwoFish string encryption and decryption

I'm using TurboPower LockBox for the first time, and using the TwoFish algorithm to first encrypt a password, and later retrieve the password by decrypting the generated hash. I would like to know ...
1
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2answers
161 views

Delphi 2009 interface

I have this code and at the end of it, FastMM shows that there were memory leaks with all the objects of TSinc: ...
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0answers
97 views

Calculate and make a database of prime numbers

I recently created a program for finding a prime number. It's working great and doing it very fast but I was wondering if you can help me make it calculate the prime numbers faster. ...
11
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1answer
1k views

Precise timings with low jitter via RDTSC (for x86 and x64)

The Win32 API has a so-called 'high performance counter' (QueryPerformanceCounter() and friends) but often it is neither precise enough nor reliable enough, due to ...
9
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1answer
787 views

Delphi XE 7 project template for saving / loading form settings

I have developed small test project as a template for production project. In this template I've found a way that the application saves and loads its own settings (ini-file). Main Form1 will contain ...
4
votes
1answer
375 views

Parsing a command line

I've written an object which allows parsing and serializing a command line. I don't in any way consider this done, but this is the beginning of it. I know there are other implementations out there ...
3
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0answers
424 views

Delphi: convenience wrapper for GetSystemTimePreciseAsFileTime()

For some purposes it can be highly desirable to use GetSystemTimePreciseAsFileTime() whenever it is available (i.e. Windows 8+) because the accuracy of ...
2
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0answers
133 views

Write data with updateresources

I have developed this function but I'm not sure if this is the best (secure) way to write in resources without corrupt *.exe in case of fails. What is the best way to write resources to a *.exe file? ...
3
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1answer
384 views

Binary and linear search methods for a number-guessing game

This is a code written is Pascal (Delphi). It asks the user to think of a number between min_ and max_ and then guesses the ...
2
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1answer
890 views

Buttons switches in Delphi

I have an action on four buttons. I need to make a down (checked) button if it's pressed and other buttons up (unchecked). My button is TToolButton and the property ...
3
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2answers
1k views

Validating Card Number in Delphi

As part of processing card payments, before even attempting to process, I need to check and validate the card number to make sure it's valid. For this, I've encapsulated this validation in a record ...
4
votes
1answer
161 views

Passing variable pointer as string to another function

With Delphi 7 I need to create a TStream variable and use/free it in another part of the code. Unfortunately it cannot be passed as "normal" parameter. I created a ...
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0answers
429 views

Porting Delphi typed arrays to .NET generics

Currently I am porting piece of code from some old Delphi API to C# and smashed into weirdness of type definitions. As its schema fits perfectly with DLL it uses (because it also was made in Delphi ...
5
votes
1answer
381 views

Translating array pointer access from C++ to Delphi

I'd like to know if I translated a piece of code correctly from C++ to Delphi. It looks like it is working, but I have a feeling that I'm reading and writing into memory that I'm not supposed to using ...
3
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2answers
3k views

Write to files in Delphi

I'm doing a program in Delphi, writing in all kinds of files, either text or executable: ...
2
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0answers
508 views

Class derived from TXmlIniFile to save/read to/from XML

I have created this unit containing a class derived from TXmlIniFile. This class uses the common TCustomInifile methods to write to and read from an XML file. It comes from an idea of Chris Rolliston ...
3
votes
1answer
12k views

Function to split text

The following pascal function (compiled with Delphi) will split strings. It works perfectly, but how to improve the code? For example, to avoid using the repeat-until loop. ...
3
votes
1answer
2k views

Function to find text between two tags

I've just finished this function and wanted to know if anyone know another way to do the same: ...
2
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0answers
610 views

Get local Dropbox path with Delphi XE7

I've put together a function in Delphi XE7 which returns the Dropbox directory path on my machine, as this path can be customized by the user. This function currently works on my computer, but it ...
3
votes
0answers
104 views

Single level of abstraction

I am reading the "Clean Code" book and trying refactoring my source code according to the principles "single level of abstraction"/"separation of concerns". How would you refactor the following code? ...
3
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2answers
5k views

Converting Delphi colors between TColor, RGB, CMYK, and HSV

I wrote a record which encapsulates conversion of colors between TColor, RGB values, CMYK ...
4
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1answer
334 views

Efficient binary patcher

I am currently working on a little binary patcher. My current code works fine but I do want my code to be optimized (fast) and as clean as possible. Could you all please help me review this? IDE: ...
3
votes
1answer
76 views

Validating user's input before creating graph using TChart

The user enters coefficients into input boxes on a form, called GetFunction. Upon clicking an OK button on said form, the input is validated using ...
2
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0answers
2k views

What's the best approach to achieve two-way communication with TIdTCPServer and TIdTCPClient?

I'm a newbie in Delphi and I'm trying to create a client/server application using INDY. I want to have a server that is capable not only of receiving messages and streaming, but also sending data to ...
6
votes
2answers
881 views

Is this an appropriate approach to “tweak” a color to a similar lighter/darker color?

I have written this function for the sole purpose to get a similar color either brighter or darker than any given color, depending on an average lightness/darkness. Essentially, I add up the R/G/B ...
5
votes
1answer
699 views

Stack-based mini-stack

I've created a MiniStack to assist in removing recursion from routines using a manual stack. Obviously if the stack is an object it lives on the heap and its ...
8
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1answer
211 views

Factorial using trampolines

I've translated this Java code into Delphi code: ...
24
votes
1answer
2k views

Executing large SQL script file with GO statements using ADO

I wrote a small component (still in the works but working) which takes a large SQL script file, splits it into different "blocks" based on GO statements, and executes them one by one. The only major ...
1
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0answers
73 views

Is this interface structure/setup correct?

I'm working on wrapping the last.fm web API. I'm trying to use Interfaces to be able to easily make calls via functions which return an interface (as opposed to an object which would need to be free'd)...
7
votes
1answer
374 views

Drawing and Painting a Menu Component

I have produced a working menu component for a project I'm working on, but would like to reduce the amount of code used and improve the methods - especially in the Paint implementation - still further,...
4
votes
0answers
941 views

Anonymous Events in Delphi

I wrote a anonymous event creator. I would like to ask if anyone can tell me if I did it the "right" or "best" way, or how I could make it better. Here is what I did: Declaration: ...
2
votes
1answer
2k views

Drill through and down the object properties with RTTI

I am in process of making debugging output better for client-side application. We have lots of auto-generated Protocol Buffers classes which are used for communication by our protocol. I am trying to ...
2
votes
0answers
97 views

Optimizing a thread library

Please give thoughts and optimization tips on my thread library. Update 1 : I have renamed the different method types. ...