Dimensional Data

C++Builder includes the use of rvalue references, which allow creating a reference to temporaries. When you initialize to an class object using an rvalue(a temporary object), C++11 looks to see if you have defined a move constructor in your class. If you have, the temporary object is passed to it as a modifiable (non-const) rvalue reference, allowing you to transfer ownership of resource pointers and handles, and nullify them in the temporary object. We can implement the move constructor as follows.   class SomeClass { private: int *foo; public: SomeClass() : foo(nullptr) {} //Move Constructor SomeClass(SomeClass &&c) { foo = c.foo; c.foo = nullptr; } }; int _tmain(int argc, _TCHAR* argv[]) { SomeClass obj = SomeClass(50); //Move constructor is called. return 0; } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 class SomeClass {   private:      int *foo;     public:   SomeClass() : foo(nullptr) {}   //Move Constructor   SomeClass(SomeClass &&c)   {      foo = c.foo;      c.foo = nullptr;   } };   int _tmain(int argc, _TCHAR* argv[]) {   SomeClass obj = SomeClass(50); //Move constructor is called.     return 0; } Here use the syntax && to indicate that the variable is an rvalue reference. When the temporary object is initialized, we now simply copy the pointer instead of the content it points to. Head over and check out all of the C++ features supported by the Clang compiler in C++Builder.

David I. has a fantastic blog post on using Python4Delphi with C++Builder. This was inspired by our previous webinars on the topic. and is the result of his collaboration with Kiriakos (AKA PyScripter), the maintainer of Python4Delphi, who also made some changes in the library to work better with C++Builder. By popular request, David and Kiriakos have also agreed to run a Python for C++ developers webinar where you can learn to leverage Python from your favorite C++ developer tools. Date: Wed, Dec 2nd, 2020 Time: 9 AM CST/1500 UTC  

We have just released a new patch focused on improving RAD Studio 10.4.1 support for XCode 12, iOS 14 and macOS 11 Big Sur (Intel): these are operating systems and tools which were not available when 10.4.1 shipped. Specifically, the patch offers fixes for a Delphi exception issue on macOS 11 Big Sur Intel (which was also affecting PAServer when running on that platform, meaning this patch includes a new version of PAServer), SDK import from Xcode 12, and debugging applications on an iOS 14 device. Notice that new ARM-based Macs running macOS 11 Big Sur can execute macOS apps built for the Intel platform, including those built with Delphi 10.4.1, via the Apple Rosetta 2 compatibility layer. The patch can be installed via GetIt (with automatic installation via a deferred package, applied as you restart RAD Studio) or a direct download from my.embarcadero.com (available shortly) and manual installation. In both cases you’ll have to copy the PAServer for macOS installer to your Mac and install it manually. The readme file includes additional information and details.

New FireMonkey developers tend to make unresponsive and bad user experience. For this, we should show guidelines and sample projects to learn how to create stunning FireMonkey projects.  This FireMonkey UI template includes three different designs for implementing an app home screen in a multi-device application.  You can get these sample UI templates from GetIt easily!  What can you learn from these samples? Use cases of TFrame Tab Controls Blur backgrounds Menu and Navigation  Simple & grid layouts and many more Be sure to check out these samples to learn more about FireMonkey app designing guidelines and FireMonkey multi-device responsive application designing! Be sure to check out other resources on building FireMonkey applications:

procedure TAbZipperTests.CreateAndTestBasicZipFile; var   ExtractDir, TestFileName : string;   AbUnZip : TAbUnZipper; begin   // Test with Setting BaseDirectory and not specifying AutoSave   TestFileName := TestTempDir + ‘basic.zip’;   if FileExists(TestFileName) then     DeleteFile(TestFileName);   Component.FileName := TestFileName;   Component.BaseDirectory := TestFileDir;   Component.AddFiles(‘*.*’,faAnyFile);   Component.Save;   Component.FileName := ”;   CheckFileExists(TestFileName);     AbUnZip := TAbUnZipper.Create(nil);   try     AbUnZip.FileName := TestFileName;     // Clean out old Directory and create a new one.     Extractdir := TestTempDir + ‘extracttest’;     if DirectoryExists(ExtractDir) then       DelTree(ExtractDir);     CreateDir(ExtractDir);     // Extract Files.     AbUnZip.BaseDirectory := ExtractDir;     AbUnZip.ExtractFiles(‘*.*’);     // Compare Extracted Files     CheckDirMatch(TestFileDir,ExtractDir);   finally     AbUnZip.Free;   end;   DeleteFile(TestFileName); end;

An event links an occurrence in the system with the code that responds to that occurrence. The occurrence triggers the execution of a procedure called an event handler. The event handler performs the tasks that are required in response to the occurrence. Events allow the behavior of a component to be customized at design-time or at run time. Do you want to trigger and handle an event similar to Delphi events? Python4Delphi provides a mechanism to do that. This post will guide you on how to create events using Python4Delphi Components. Python4Delphi Demo21 Sample App shows how to create a Module, Python type, and add an event to it and define the event, Import the module and Python Type in a python script, and access the created event. You can find the Demo21 source on GitHub. Prerequisites: Download and install the latest Python for your platform. Follow the Python4Delphi installation instructions mentioned here. Alternatively, you can check out this video Getting started with Python4Delphi. Components used in Python4Delphi Demo21 App: TPythonEngine: A collection of relatively low-level routines for communicating with Python, creating Python types in Delphi, etc. It’s a singleton class. TPythonGUIInputOutput: Inherited from TPythonInputOutput (which works as a console for python outputs) Using this component Output property you can associate the Memo component to show the Output. TPythonModule: It’s inherited from TMethodsContainer class allows creating modules by providing a name. You can create events using the Events property. After creating the event with a name, its handler can be defined by clicking the OnExecute method which takes the sender, PythonObject, and a variable parameter result as argument. TPythonType: It’s inherited from TGetSetContainer class contains a set of APIs to create, manage a Python Type in Delphi. Similar to TPythonModule, this also has Events property. TPyPoint Delphi class implementing a new Python type. It must derive from TPyObject or one of its descendants. Then it must override some methods, like the constructors, the RegisterMethods, and the type services’ virtual methods. TMemo: A multiline text editing control, providing text scrolling. The text in the memo control can be edited as a whole or line by line. You can find the Python4Delphi Demo21 sample project from the extracted GitHub repository ..Python4DelphiDemosDemo21.dproj. Open this project in RAD Studio 10.4.1 and run the application. Implementation Details: PythonEngine1 provides the connection to Python or rather the Python API. This project uses Python3.9 which can be seen in TPythonEngine DllName property. PythonGUIInputOutput1 provides a conduit for routing input and output between the Graphical User Interface (GUI) and the currentlyexecuting Python script. PythonModule1 with Module name spam is created. Created an eventPythonModule1.Events[0]. And on execute event(PythonModule1Events0Execute) defined with below code. procedure TForm1.PythonModule1Events0Execute(Sender: TObject; PSelf, Args: PPyObject; var Result: PPyObject); begin with GetPythonEngine do begin Result := PyUnicodeFromString(‘Hello world !’); end; end; procedure TForm1.PythonModule1Events0Execute(Sender: TObject; PSelf,   Args: PPyObject; var Result: PPyObject); begin   with GetPythonEngine do   begin     Result := PyUnicodeFromString(‘Hello world !’);   end; end; PythonType1 during initialization, associate PyObjectClass with the created TPyPoint class. Created an event PythonType1.Events[0]. And on execute event(PythonType1Events0Execute) defined with below code. procedure TForm1.PythonType1Events0Execute(Sender: TObject; PSelf, Args: PPyObject; var Result: PPyObject); var dx, dy : Integer; Instance : TPyPoint; begin with GetPythonEngine do begin // Convert the PSelf Python object to a Delphi instance pointer. Instance := TPyPoint(PythonToDelphi(PSelf)); // first we extract the arguments if PyArg_ParseTuple( args, ‘ii:Point.Offset’,@dx, @dy ) 0 then begin // if it’s ok, then we call the method […]