In the Clang-enhanced C++ compilers, two consecutive right angle brackets no longer generate an error, and these constructions are treated according to the C++11 standard. C++03’s parser defines “>>” as the right shift operator or stream extraction operator in all cases. However, with nested template declarations, there is a tendency for the programmer to neglect to place a space between the two right angle brackets, thus causing a compiler syntax error. C++11 improves the specification of the parser so that multiple right angle brackets will be interpreted as closing the template argument list where it is reasonable. Right angle brackets example #pragma hdrstop #pragma argsused #include #include #include typedef std::vector > Table; // OK typedef std::vector> Flags; // OK int _tmain(int argc, _TCHAR* argv[]) { return 0; } #pragma hdrstop #pragma argsused #include #include #include typedef std::vector<std::vector<int> > Table; // OK typedef std::vector<std::vector<bool>> Flags; // OK int _tmain(int argc, _TCHAR* argv[]) { return 0; } Head over and find all of the different C++ language features now available in C++Builder.
In this CodeRage session, you can learn how to speed up FireMonkey layout construction and improve the painting performance of FireMonkey applications. With Delphi Visual Designer you can design any user interface by easily dragging and dropping the components. If you need some customizations you can alter the properties of the components or just change the style. But complex layouts tend to contain more controls than necessary. TFmxObject – Base Class for FireMonkey Components Heavyweight class Several lazily initialized lists on top of TComponent ones Complex layouts need a substantial amount of time to construct, align and paint Performance penalties can be significant on mobile platforms So, how we can optimize our layouts then? Here are the possible layout optimization options that you can implement: Simplify layout designs Optimize images for screen size and density Avoid shadows, effects, or any unnecessary effects Implement Lazy loading Optimize layout hierarchies without changing the visual appearance of the layout Be sure to watch the session to learn and grasp real-world experience in optimizing FireMonkey applications!
Alien Invasion is a classic arcade-style game which features a grid of aliens that move in sync back and forth across the screen. They fire projectiles at the player who is at the bottom of the screen. On each trip back and forth across the screen, they start moving faster and faster. There are four shields near the bottom of the screen that the player can hide behind but they have a limited number of hits they can take before each shield is exhausted. The player can only move back and forth at the bottom of the screen and fire projectiles upward. What you can learn from this complete Alien Invasion game sample: Game Design Basics Game Development App Tethering Collision Detection Building Game Loops Working With Sounds/Music Cross-Platform Development Patterns TMotionSensor TBitmapListAnimation You can download this game sample from GetIt easily With RAD Studio, game development is absolutely easy to start. Moreover, with the components, your development process goes smoothly. Furthermore, there are several game engines built with Delphi that you can create many different games from 2D to 3D! Be sure to check out these game engines and the games built with that engine!
FinalBuilder is a build automation tool used by thousands of developers to simplify their build process and it is built in Delphi. Some of the FinalBuilder features include integrated debugging, email, MSN, FTP & SFTP support, version control integration, detailed logging, variables, scripting support, and an action studio for writing custom FinalBuilder actions. Build scripts can be scheduled with windows scheduler, or integrate them with Continua CI, Jenkins or any other CI Server according to the FinalBuilder site. FinalBuilder lists companies such as Intel, Samsung, Symantec, Cisco, and HP among their customers. There is a massive amount of features with this product and they have a feature matrix that outlines it all. Website https://www.finalbuilder.com/finalbuilder Screenshot Gallery
WinRT is the latest application architecture from Microsoft for Windows 10 and components development. This webinar will show you how to take advantage of the new WinRT APIs and components in your Delphi and C++Builder applications. WinRT is a modern C++17 language projection for WinRT and it’s implemented entirely in header files. This leads to great performance, both in time and space, typically performing better and producing smaller binaries than any other language option for the Windows Runtime. In one sentence, WinRT is for the new world. Agenda The Windows architecture strategy What is WinRT? Why should we care about it? WinRT/UWP vs Win32 vs COM vs .NET The Ever Moving Strategy with Windows WinRT Components in RAD Studio Q&A Windows Runtime Combine what’s great in COM and .NET Binary interface for language interoperability Metadata management is similar to .NET New COM as a natural part of all languages/platforms .NET, C++, JavaScript, Delphi and C++ Builder Build a new class library on the new runtime Cleanup the library compared to .NET Do not enforce managed code
MongoDB is a document database, which means it stores data in JSON-like documents, the most natural way to think about data, and is much more expressive and powerful than the traditional row/column model. How about connecting with MongoDB and exploring the available databases and data using FireDAC components in your Application. Don’t know where to start? This post will guide you to do that. MongoDB.Explore Sample App shows how to connect to available MongoDB Databases, access to its ListCollections, and populate to the grid using MongoDB API wrapper class. You can find Delphi and C++ code samples in GitHub Repositories. Search by name into the samples repositories according to your RAD Studio version. Components used in MangoDB.Explore Sample App: TFDPhysMongoDriverLink: To link the MongoDB driver to an application and set it up. In general, it is enough to only include the FireDAC.Phys.MongoDB unit into your application uses a clause. The TFDPhysMongoDriverLink component can be used to specify: The VendorHome – the MongoDB installation root folder. The VendorLib – the name and the optional path to the MongoDB client library. TFDConnection: To establish a connection to a DBMS and to manage associated datasets. TFDMongoDataset: Used to attach a dataset to an existing MongoDB cursor. This class allows you to attach the dataset to an existing MongoDB cursor. You can get the cursor from various MongoDB API wrapping class methods, such as TMongoDatabase.ListCollections.To open a dataset, assign a cursor to the Cursor property and call the Open method. TFDMongoQuery: The TFDMongoQuery class is used to execute a MongoDB query. You can specify a query in one of the following ways: Using the QProject, QMatch, and QSort properties at design-time or run-time. Using the Query Builder provided by the Query property at run-time. Use TDataSource to populate the fetched data to TDBGrid. Implementation Details: You can find the MongoDB Explore Demo sample project at: Object PascalDatabaseFireDACSamplesDBMS SpecificMongoDBMongo_Explore.dproj. Before running this, as a preliminary step, we need to have a MongoDB Server is running and accessible from your host. For Details, See Connect to MongoDB Database. Check the below screen for listing the databases in the MongoDB server. Upon changing the database, its list collections changes. This screen Demonstrates the “restaurants” collection of the “test” database is provisioned with test data. To provision this collection, run the MongoDB Restaurants Demo, and click the Load Data button: You can find the MongoDB Restaurants Demo sample project at: Object PascalDatabaseFireDACSamplesDBMS SpecificMongoDBRestaurants Check out the full article in the DocWiki about the MongoDB.Explore Sample. Check out the full source code for the MongoDB.Explore projects for Delphi over on GitHub. Check out the full source code for MondoDB samples in C++ over on GitHub.
It is already November—time flies these days. Despite the global pandemic, we keep charging ahead. As developers are getting more used to working from home (and some love it), we see more projects picking up, which is exciting. I am especially thrilled that there are more and more public Delphi projects on GitHub, and related discussions on popular platforms, such as Stack Overflow and Reddit, are growing, though not as quickly. I know that we have our own more proprietary ones, which are great, but the more Delphi we put out there, the better! My themes lately have been simple: Develop brilliant code. Share it. Inspire existing and new Delphi developers. Have you checked any of these boxes lately? There are about 8K Delphi projects on GitHub. Some 500K+ developers know Delphi, and at least 200-300K are actively developing with it. You do the math! We recently released Bold for Delphi open source to help contribute to the community, and a fantastic group of developers is now working on the project. Embarcadero is just getting started with open source projects, so be on the lookout for more! Here are some highlights of our current efforts: 10.4 was an essential release with over 1,000 enhancements and quality fixes. Many of its features were welcomed by both large companies and individual developers. 10.4.1 is a stable and robust version, featuring a faster implementation of Delphi Code Insight based on Language Server Protocol, VCL styles that work great with High-DPI and 4K monitors, extended Apple platforms, and API coverage. It also includes a much improved GetIt package manager and many other features. 10.4.1 adds over 800 quality improvements, including 500+ for issues publicly reported on the Quality Portal site. 10.4.2 Beta is also kicking off soon for Update Subscription customers. It is a great time to upgrade! With almost 4000 people registered, this was our biggest annual Delphi event. If you missed the live sessions, register now to catch the replays. This year we included many expert panels, including with some of Delphi’s lead architects, a massive hit with everyone! Join and enjoy presentations from thought leaders and check out some of the great perks and discounts available. One of our goals with DelphiCon was to simplify the format compared to previous CodeRage events and we hope you enjoyed it. We are always looking for ways to improve, and your feedback is valuable. By popular demand, a dedicated C++ event is in the works for the spring. Product management recently updated the RAD Studio roadmap for November 2020. Always great to see what the plans are for the future, and read the commentary from product management around these plans. These roadmaps are based on the direction of the industry, and the feedback we receive from you, our users. Check out the roadmap, leave your feedback, and file feature requests on Quality Portal. We realize that budgets are tight these days and want to make working with the latest releases more economical. We have a number of attractive global promotions to fit different needs. We have enhanced the Architect SKU to include a lot of value-added products, from Ext JS and Ranorex licenses to the expanded use of InterBase and RAD Server. If you are looking for the best dollar deal, that is clearly […]
We know how to do Multithreading in Delphi. How about a simple python script that performs threading in Python and runs the script in the Delphi application? This brings the advantage of using existing multithreaded or new python scripts in your Delphi application. This post guide you to do that with the Python4Delphi Sample app. You can also use Python4Delphi with C++Builder. Python4Delphi Demo22 Sample App shows how to create a Python script in Delphi Application which demonstrates creating thread and output the result in windows console, passing arguments in the command line. You can find the Demo22 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 Demo22 App: TPythonEngine: A collection of relatively low-level routines for communicating with Python, creating Python types in Delphi, etc. It’s a singleton class. You can find the Python4Delphi Demo22 sample project from the extracted GitHub repository ..Python4DelphiDemosDemo22.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. It uses a Python Script file threading_test.py where the below list of modules was used. threading: This module constructs higher-level threading interfaces on top of the lower level _thread module. collections: This module implements specialized container datatypes providing alternatives to Python’s general-purpose built-in containers, dict, list, set, and tuple. In this sample, deque is used. time: This module provides various time-related functions. threading_test.py contains, ProducerThread, ConsumerThread, BoundedQueue class within the function _test. Memo1, used for providing the Python Script to execute. On Clicking Execute Button the below code executes the python script. procedure TForm1.Button1Click(Sender: TObject); begin PythonEngine1.ExecStrings( Memo1.Lines ); end; procedure TForm1.Button1Click(Sender: TObject); begin PythonEngine1.ExecStrings( Memo1.Lines ); end; The script below is executed which will opens a window console, create threads put in a queue and execute one after other. import threading_test import sys # the following is needed to use the newly allocated console! sys.stdout = sys.stderr= open(‘CONOUT$’, ‘wt’) try: count = int(sys.argv[1]) except: count = 3 for i in range(count): print (“**** Pass”, i) threading_test._test() print (“**** Done.”) import threading_test import sys # the following is needed to use the newly allocated console! sys.stdout = sys.stderr= open(‘CONOUT$’, ‘wt’) try: count = int(sys.argv[1]) except: count = 3 for i in range(count): print (“**** Pass”, i) threading_test._test() print (“**** Done.”) Head over and check out the open source Python4Delphi project which makes it easy to build Python GUIs for Windows with Delphi.
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
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