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applications
DELPHI COMMUNITY EDITION DATABASE TUTORIALS, PART 1 Delphi Starter database tutorials with TClientDataBase. Delphi Community Edition databases. With the free Delphi Community Edition you can build database applications. Delphi CE contains components for TClientDataSet, TFDConnection (FireDac database), TDataSource, TDBGrid, TDBEdit, and more. LAZARUS: SQLITE DATABASE TUTORIALS SQLite is for embedded (non-server) databases. It reads and writes directly to disk files. SQLite is the most widely deployed database in the world. There are billions of SQLite database files in use daily, on smartphones and gadgets and in desktop applications. A few of LAZARUS VERSUS DELPHI Lazarus versus Delphi. The most obvious reason for preferring Lazazus: it is free. Compare this to Delphi: the cheapest version, Delphi Professional, was priced at $1719 in 2018 (other versions: from $4041 to $6466). Note that there is also a free Delphi Starter with severely limited features, notably with regard to database applications and LAZARUS: SETTING UP A PROJECT Setup of the project. Start Lazarus. If a project is already loaded, in the main menu select File / Close All. In the main menu, select File / New / Project / Application. A new graphical Free Pascal application is created. The title bar of the IDE shows the name of the project: Project1. Several windows appear: the "Object Inspector" onthe
C++ BUILDER: RANDOM NUMBERS AND STRINGS C++ Builder: Random numbers, strings and words. C++ Builder contains a random number generator, that generates pseudo-random numbers. Random numbers are often used in games, but also can be very useful fortesting purposes.
C++ BUILDER: FILE AND DIRECTORY OPERATIONSFILE DIRECTORY LISTFILE DIRECTORY PYTHONFILE FOLDER DIRECTORYPYTHON GET FILE DIRECTORYUSERDIRECTORY FILES
Directory operations. TDirectory::Exists (Path, FollowLink) checks whether a given directory exists. It returns true if the given path exists and is a directory, and false otherwise. Parameter FollowLink specifies if it is a "symbolic link file", a special type of file containing a reference to another file or directory; that's not the case here, so we pass the value false. LAZARUS: REPORTS WITH LAZREPORT Lazarus provides LazReport, a report generator, for adding reporting capabilities to applications. It uses a visual report designer to create so-called "banded" reports. LazReport includes its own Object Inspector and a report previewer, that can also print the report atruntime.
DELPHI TUTORIAL, TIPS, SOURCE CODE -- BY DELPHILANDDELPHI SOURCE CODE EXAMPLESDELPHI SOURCE CODEDELPHI CODE EXAMPLEDELPHI GLASS COUPONS FREE SHIPPINGDELPHI PROGRAMMING EXAMPLES Learn programming with our online C++ Builder and Delphi tutorials. Fully commented source code matching each tutorial. Download lessons and source. We also offer more specific tutorials with complete projects, tips, free source code, links to the best sites. DELPHI TUTORIALS FOR BEGINNERS, ONLINE, DOWNLOAD Site Overview: alphabetical list of main topics.: Database tutorials using ClientDataSet and XML files, or SQLite: FAQ: Frequently Asked Questions: Delphi Column: an in depth look at specific topics: Tips and tricks - working with the IDE (Integrated Development Environment), using the VCL (Visual Component Library), algorithms, units, variables and other weird animals. LAZARUS / FREE PASCAL TUTORIALS Lazarus is a Rapid Application Development Tool for Free Pascal . It comes with the LCL, Lazarus Component Library, the counterpart of Delphi's VCL. It contains the same visual components like buttons, windows, checkbox, treeview and more, plus some extra's. Unlike the free Delphi Starter which has very poor support for databaseapplications
DELPHI COMMUNITY EDITION DATABASE TUTORIALS, PART 1 Delphi Starter database tutorials with TClientDataBase. Delphi Community Edition databases. With the free Delphi Community Edition you can build database applications. Delphi CE contains components for TClientDataSet, TFDConnection (FireDac database), TDataSource, TDBGrid, TDBEdit, and more. LAZARUS: SQLITE DATABASE TUTORIALS SQLite is for embedded (non-server) databases. It reads and writes directly to disk files. SQLite is the most widely deployed database in the world. There are billions of SQLite database files in use daily, on smartphones and gadgets and in desktop applications. A few of LAZARUS VERSUS DELPHI Lazarus versus Delphi. The most obvious reason for preferring Lazazus: it is free. Compare this to Delphi: the cheapest version, Delphi Professional, was priced at $1719 in 2018 (other versions: from $4041 to $6466). Note that there is also a free Delphi Starter with severely limited features, notably with regard to database applications and LAZARUS: SETTING UP A PROJECT Setup of the project. Start Lazarus. If a project is already loaded, in the main menu select File / Close All. In the main menu, select File / New / Project / Application. A new graphical Free Pascal application is created. The title bar of the IDE shows the name of the project: Project1. Several windows appear: the "Object Inspector" onthe
C++ BUILDER: RANDOM NUMBERS AND STRINGS C++ Builder: Random numbers, strings and words. C++ Builder contains a random number generator, that generates pseudo-random numbers. Random numbers are often used in games, but also can be very useful fortesting purposes.
C++ BUILDER: FILE AND DIRECTORY OPERATIONSFILE DIRECTORY LISTFILE DIRECTORY PYTHONFILE FOLDER DIRECTORYPYTHON GET FILE DIRECTORYUSERDIRECTORY FILES
Directory operations. TDirectory::Exists (Path, FollowLink) checks whether a given directory exists. It returns true if the given path exists and is a directory, and false otherwise. Parameter FollowLink specifies if it is a "symbolic link file", a special type of file containing a reference to another file or directory; that's not the case here, so we pass the value false. LAZARUS: REPORTS WITH LAZREPORT Lazarus provides LazReport, a report generator, for adding reporting capabilities to applications. It uses a visual report designer to create so-called "banded" reports. LazReport includes its own Object Inspector and a report previewer, that can also print the report atruntime.
LAZARUS: SETTING UP A PROJECT Setup of the project. Start Lazarus. If a project is already loaded, in the main menu select File / Close All. In the main menu, select File / New / Project / Application. A new graphical Free Pascal application is created. The title bar of the IDE shows the name of the project: Project1. Several windows appear: the "Object Inspector" onthe
TDBGRID - FESTRA
DBGrid. In this column, we have a detailed look at the TDBGrid component. With a DBGrid you visualize the contents of a DataSet. The DBGrid also lets you edit, add and delete records, and it lets you scroll and navigate. This article focuses on the use of the TClientDataSet component, mapped to a local file.COLORS IN C++
Colors in C++. The type TColor is used to specify the color of a control. It is used by the Color property of many components and by a number of other properties that specify color values.. Color constants. C++ Builder contains definitions of constants for standard TColor values. These constants map either directly to the closest matching color in the system palette (for example, clBlue maps LAZARUS: DATABASE TUTORIALS Database Tutorials. Lazarus allows for programming database applications. We present tutorials for two well known types of databases: DBF, the underlying file format for the legendary dBase system. dBase was one of the first database management systems for microcomputers, and the most successful in its day. The .dbf file format is still widely used by millions of software developers. DELPHI TIPS: BEGINUPDATE / ENDUPDATE SPEED UP LISTBOX BeginUpdate and EndUpdate prevent excessive redraws and speed up processing time when items are added, deleted, or inserted. Here's a simple source code example for using this technique with a ListBox containing 10000 items: ListBox1.Items. BeginUpdate ; for C++ BUILDER: STRUCTURES AND ARRAYS C++ Builder: Structures and Arrays Structures. A structure is a group of variables of different data types under a single name.The elements are known as members; they can have different types and different lengths. Data structures are declared in C++ using the following syntax: struct name { type membername1; type membername2; // and so on LAZARUS: REPORTS WITH LAZREPORT SQLite Database Tutorial: Report generator. Lazarus provides LazReport, a report generator, for adding reporting capabilities to applications. It uses a visual report designer to create so-called "banded" reports. LazReport includes its own Object Inspector and a report previewer, that DELPHI SOURCE CODE: BROWSE FOR FOLDER Delphi source code: Browse for Folder. The following function lets the user browse for a folder in a treeview, that starts at the desktop. If a folder is selected, the function returns TRUE and the name of the selected folder is placed in variable Foldr ; otherwise, it returns FALSE. Don't let the code scare you, because it uses some exotic LAZARUS: SQLITE DATABASES, CONTINUED GuitarClub project with 2 tables. For this project, create a folder FPlaz\SQLite02, download SQLite02.zip and unzip to this folder. Start Lazarus and open project SQLite02. Compile and run the application (press F9). Play a while with the application: navigate through the grid by using the DBNavigator, modify records, add records, deleterecords.
C++BUILDER CONSOLE APPLICATIONS: SETUP AND COMPILATION C++ Console Applications: setup and compilation What is a Console Application? While originally C++ Builder was developed for writing Windows applications with a "Graphical User Interface" (GUI), you can also use it for Console Applications.Worldwide, teachers use these pure text programs for teaching C++. DELPHI TUTORIAL, TIPS, SOURCE CODE -- BY DELPHILANDDELPHI SOURCE CODE EXAMPLESDELPHI SOURCE CODEDELPHI CODE EXAMPLEDELPHI GLASS COUPONS FREE SHIPPINGDELPHI PROGRAMMING EXAMPLES Learn programming with our online C++ Builder and Delphi tutorials. Fully commented source code matching each tutorial. Download lessons and source. We also offer more specific tutorials with complete projects, tips, free source code, links to the best sites. DELPHI TUTORIALS FOR BEGINNERS, ONLINE, DOWNLOAD Site Overview: alphabetical list of main topics.: Database tutorials using ClientDataSet and XML files, or SQLite: FAQ: Frequently Asked Questions: Delphi Column: an in depth look at specific topics: Tips and tricks - working with the IDE (Integrated Development Environment), using the VCL (Visual Component Library), algorithms, units, variables and other weird animals. LAZARUS / FREE PASCAL TUTORIALS Lazarus is a Rapid Application Development Tool for Free Pascal.It comes with the LCL, Lazarus Component Library, the counterpart of Delphi's VCL. It contains the same visual components like buttons, windows, checkbox, treeview and more, plus some extra's. LAZARUS: SETTING UP A PROJECT Adding components. Click on the window that shows your main form. It that's not visible, either select menu View / Toggle Form/Unit View or simply press function key F12.; Let's start by giving a meaningful caption to the form.In the Object Inspector, click next to Caption and enter FirstProject.; Add a TEdit component to the form: in the component palette, on the tab Standard, click on the DELPHI COMMUNITY EDITION DATABASE TUTORIALS, PART 1 Delphi Starter database tutorials with TClientDataBase. Delphi Community Edition databases. With the free Delphi Community Edition you can build database applications. Delphi CE contains components for TClientDataSet, TFDConnection (FireDac database), TDataSource, TDBGrid, TDBEdit, and more. LAZARUS: SQLITE DATABASE TUTORIALS A complete SQLite database with multiple tables, indices, and so on, is contained in a single disk file. SQLite does not have any file naming requirements and so the application can use any custom file suffix, for example .sdlite, .db, C++BUILDER TIPS: COMBOBOX TYPES C++Builder Tips: which ComboBox to use? A ComboBox is a combination of a listbox and an edit.C++ Builder provides for three types of combobox styles, that you can select in the Object Inspector. LAZARUS VERSUS DELPHI Lazarus versus Delphi. The most obvious reason for preferring Lazazus: it is free. Compare this to Delphi: the cheapest version, Delphi Professional, was priced at C++ BUILDER: RANDOM NUMBERS AND STRINGS C++ Builder: Random numbers, strings and words. C++ Builder contains a random number generator, that generates pseudo-random numbers. Random numbers are often used in games, but also can be very useful fortesting purposes.
C++ BUILDER: FILE AND DIRECTORY OPERATIONSFILE DIRECTORY LISTFILE DIRECTORY PYTHONFILE FOLDER DIRECTORYPYTHON GET FILE DIRECTORYUSERDIRECTORY FILES
Directory operations. TDirectory::Exists (Path, FollowLink) checks whether a given directory exists. It returns true if the given path exists and is a directory, and false otherwise. Parameter FollowLink specifies if it is a "symbolic link file", a special type of file containing a reference to another file or directory; that's not the case here, so we pass the value false. DELPHI TUTORIAL, TIPS, SOURCE CODE -- BY DELPHILANDDELPHI SOURCE CODE EXAMPLESDELPHI SOURCE CODEDELPHI CODE EXAMPLEDELPHI GLASS COUPONS FREE SHIPPINGDELPHI PROGRAMMING EXAMPLES Learn programming with our online C++ Builder and Delphi tutorials. Fully commented source code matching each tutorial. Download lessons and source. We also offer more specific tutorials with complete projects, tips, free source code, links to the best sites. DELPHI TUTORIALS FOR BEGINNERS, ONLINE, DOWNLOAD Site Overview: alphabetical list of main topics.: Database tutorials using ClientDataSet and XML files, or SQLite: FAQ: Frequently Asked Questions: Delphi Column: an in depth look at specific topics: Tips and tricks - working with the IDE (Integrated Development Environment), using the VCL (Visual Component Library), algorithms, units, variables and other weird animals. LAZARUS / FREE PASCAL TUTORIALS Lazarus is a Rapid Application Development Tool for Free Pascal.It comes with the LCL, Lazarus Component Library, the counterpart of Delphi's VCL. It contains the same visual components like buttons, windows, checkbox, treeview and more, plus some extra's. LAZARUS: SETTING UP A PROJECT Adding components. Click on the window that shows your main form. It that's not visible, either select menu View / Toggle Form/Unit View or simply press function key F12.; Let's start by giving a meaningful caption to the form.In the Object Inspector, click next to Caption and enter FirstProject.; Add a TEdit component to the form: in the component palette, on the tab Standard, click on the DELPHI COMMUNITY EDITION DATABASE TUTORIALS, PART 1 Delphi Starter database tutorials with TClientDataBase. Delphi Community Edition databases. With the free Delphi Community Edition you can build database applications. Delphi CE contains components for TClientDataSet, TFDConnection (FireDac database), TDataSource, TDBGrid, TDBEdit, and more. LAZARUS: SQLITE DATABASE TUTORIALS A complete SQLite database with multiple tables, indices, and so on, is contained in a single disk file. SQLite does not have any file naming requirements and so the application can use any custom file suffix, for example .sdlite, .db, C++BUILDER TIPS: COMBOBOX TYPES C++Builder Tips: which ComboBox to use? A ComboBox is a combination of a listbox and an edit.C++ Builder provides for three types of combobox styles, that you can select in the Object Inspector. LAZARUS VERSUS DELPHI Lazarus versus Delphi. The most obvious reason for preferring Lazazus: it is free. Compare this to Delphi: the cheapest version, Delphi Professional, was priced at C++ BUILDER: RANDOM NUMBERS AND STRINGS C++ Builder: Random numbers, strings and words. C++ Builder contains a random number generator, that generates pseudo-random numbers. Random numbers are often used in games, but also can be very useful fortesting purposes.
C++ BUILDER: FILE AND DIRECTORY OPERATIONSFILE DIRECTORY LISTFILE DIRECTORY PYTHONFILE FOLDER DIRECTORYPYTHON GET FILE DIRECTORYUSERDIRECTORY FILES
Directory operations. TDirectory::Exists (Path, FollowLink) checks whether a given directory exists. It returns true if the given path exists and is a directory, and false otherwise. Parameter FollowLink specifies if it is a "symbolic link file", a special type of file containing a reference to another file or directory; that's not the case here, so we pass the value false. LAZARUS: SETTING UP A PROJECT Setup of the project. Start Lazarus. If a project is already loaded, in the main menu select File / Close All. In the main menu, select File / New / Project / Application. A new graphical Free Pascal application is created. The title bar of the IDE shows the name of the project: Project1. Several windows appear: the "Object Inspector" onthe
COLORS IN C++
Colors in C++. The type TColor is used to specify the color of a control. It is used by the Color property of many components and by a number of other properties that specify color values.. Color constants. C++ Builder contains definitions of constants for standard TColor values. These constants map either directly to the closest matching color in the system palette (for example, clBlue mapsTDBGRID - FESTRA
DBGrid. In this column, we have a detailed look at the TDBGrid component. With a DBGrid you visualize the contents of a DataSet. The DBGrid also lets you edit, add and delete records, and it lets you scroll and navigate. This article focuses on the use of the TClientDataSet component, mapped to a local file. DELPHI TUTORIAL, LESSON 15: CSV FILES, PART 2 Parsing a CSV file About loading and parsing a csv file Setup of the project. Create a small database to keep our stock of office material. The file format should follow the rules as explained in lesson 14.Set up the following structure, either with MS Excel (see last part of lesson 14) or with a text editor, and save as Office.csv. Partnumber,Article,Price,Stock DELPHI TIPS: BEGINUPDATE / ENDUPDATE SPEED UP LISTBOX BeginUpdate and EndUpdate prevent excessive redraws and speed up processing time when items are added, deleted, or inserted. Here's a simple source code example for using this technique with a ListBox containing 10000 items: ListBox1.Items. BeginUpdate ; for C++ BUILDER: STRUCTURES AND ARRAYS C++ Builder: Structures and Arrays Structures. A structure is a group of variables of different data types under a single name.The elements are known as members; they can have different types and different lengths. Data structures are declared in C++ using the following syntax: struct name { type membername1; type membername2; // and so on DELPHI SOURCE CODE: BROWSE FOR FOLDER Delphi source code: Browse for Folder. The following function lets the user browse for a folder in a treeview, that starts at the desktop. If a folder is selected, the function returns TRUE and the name of the selected folder is placed in variable Foldr ; otherwise, it returns FALSE. Don't let the code scare you, because it uses some exotic LAZARUS: SQLITE DATABASES, CONTINUED GuitarClub project with 2 tables. For this project, create a folder FPlaz\SQLite02, download SQLite02.zip and unzip to this folder. Start Lazarus and open project SQLite02. Compile and run the application (press F9). Play a while with the application: navigate through the grid by using the DBNavigator, modify records, add records, deleterecords.
C++ BUILDER: KEYBOARD AND MOUSE EVENTS Mouse. A MouseDown event occurs when the user presses a mouse button with the mouse pointer over a control.Use the OnMouseDown event handler to handle any additional processing.Example: void __fastcall TForm1::Edit1MouseDown(TObject *Sender, TMouseButton Button, TShiftState Shift, int X, int Y) { } The OnMouseDown event handler can respond to left, right, or center mouse button presses LAZARUS: REPORTS WITH LAZREPORT Lazarus provides LazReport, a report generator, for adding reporting capabilities to applications. It uses a visual report designer to create so-called "banded" reports. LazReport includes its own Object Inspector and a report previewer, that can also print the report atruntime.
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