PowerBASIC: История и Современное Состояние Компилятора

Software compiler

PowerBASIC, formerly Turbo Basic, is the brand of several commercial compilers by PowerBASIC Inc. that compile a dialect of the BASIC programming language. There are both MS DOS and Windows versions, and two kinds of the latter: Console and Windows. The MS DOS version has a syntax similar to that of QBasic and QuickBASIC. The Windows versions use a BASIC syntax expanded to include many Windows functions, and the statements can be combined with calls to the Windows API.

The first version of the DOS compiler was published as BASIC/Z, the very first interactive compiler for CP/M and MDOS. Later it was extended to MS DOS/PC DOS and in 1987 Borland distributed it as Turbo Basic. Turbo Basic was originally created by Robert "Bob" Zale (1945–2012) and bought from him by Borland. When Borland decided to stop publishing it (1989), Zale bought it back from them, renamed it PowerBASIC and set up PowerBASIC Inc. to continue support and development of it; it was later called PBDOS. PowerBASIC went on to develop BASIC compilers for Windows, first PBWIN — their flagship product — and then PBCC, described below. On November 6, 2012, Robert Zale, the creator of PowerBASIC, died. For a time, it was assumed that the company might cease operations. His wife, Vivian Zale, posted on 8 March 2014 to the PowerBASIC forums a statement that the company would continue in operation. On May 10, 2015, Vivian Zale announced that work was continuing on new versions of PowerBASIC compilers. On November 2, 2016, Vivian Zale announced her intention to seek a buyer for the company. On January 31, 2017, Adam Drake announced Drake Software had acquired the PowerBASIC source code from PowerBASIC, Inc., with the intention of updating and improving the functionality of the product. This was later confirmed by Vivian Zale with a forum post thanking the members for their support. When Bob Zale died, PBWin11 and PBCC7 were in beta testing, and 64 bit compilers and PB/Pro (PBWin and CC in one compiler) were in the alpha stages. However, development of PowerBASIC products has stopped. No new version has been released since v10.03 (11 years ago as of May 2022). No 64 bit version or beta release has been announced. No development activity has been reported. No corrections (such as adding the correct DPI settings for the IDE) have been released. PowerBASIC Tools LLC still sells new licenses for the 32 bit Windows compilers.

PowerBASIC programs are self contained and use no runtime file to execute. In all versions of the compiler, the applications compile without external libraries, though it can use such libraries if needed. PBDOS creates 16 bit DOS MZ executable files, while PBWIN and PBCC create 32 bit Portable Executable (PE) files.

Borland's Turbo Basic contains extensions to classic BASIC (without breaking compatibility), such as a drawing API and mouse access. Unlike most BASIC implementations of its time, Turbo Basic was a full compiler which generated native code for MS DOS. Other implementations were either interpreters, or relied heavily on a runtime library. The integrated development environment could run a BASIC program internally for traditional BASIC debugging (see sample below), or generate an MS DOS stand alone executable file that could be run on other systems without the Turbo Basic product or runtime libraries.

PBDOS includes an integrated development environment (IDE) and supports DOS 3.30 and all later versions.

PBCC is a 32 bit compiler for the Windows 9x series and Windows NT series of operating systems, including Windows XP, Windows Server 2008, Windows Vista, and Windows 7. PBCC applications can use dynamic link libraries (DLLs). The compiler comes with an IDE including an editor and stepping debugger. No knowledge of Windows programming is required to create character mode or graphical applications with this compiler. PBCC compiled executables can also be used as Common Gateway Interface executables (for web servers). PBCC creates only executables, not DLLs. (PBWin — see below — can create both.)

PBWin is a 32 bit compiler compatible with the Windows 9x series and the Windows NT series of operating systems, including Windows XP, Windows Server 2008, Windows Vista, Windows 7, Windows 8 (8.1), and Windows 10. PBWin can create dynamic link libraries. PBWin applications can read dynamic link libraries]. PBWin comes with a compiler, IDE with editor, and stepping debugger.

You can create an application's graphical user interface using the Windows API, or by using the built in DDT language extensions. The group of BASIC statements which wrap Windows API functions, particularly in the creation and handling of dialog boxes and child controls, is collectively known as Dynamic Dialog Tools. Using DDT requires less coding than to create a similar program using the Windows API. Using the DDT and the Windows API (known as SDK style as in Microsoft Windows SDK) are not mutually exclusive.

PowerBASIC renamed PBWin v9.07 and PB/CC v5.07 as "Classic PBWin" and "Classic PB/CC", respectively, and on November 1, 2016, offered them for a short time through their online store as free, no nag, trial versions along with PBForms v1.0 (PowerBASIC Forms).

PowerBASIC Forms, available for purchase separately, is a graphical user interface design tool add on for PBWin. It automatically produces source code using the DDT language extension that creates forms using the Windows graphical user interface.

The PowerBASIC COM Browser, which comes with PBWin, is an application that exposes the interfaces, methods, and properties of COM objects, as described by type library files. The PowerBASIC COM Browser exports an interface structure of a COM object for early binding purposes in PowerBASIC code, and gives syntax reference and context help on the interface members exposed by a COM object.

PowerBASIC is a native code BASIC compiler whose reported merits are simplicity of use and speed compared to other languages. Although the compiled code is fast enough for most purposes, the compilers also support inline assembler which can be used for hand optimization of critical routines. The Windows compilers (PBWin & PBCC) support almost all of the x86 instruction set, including FPU, SIMD, and MMX, the main exceptions being a few which are useful mostly to systems programmers. One can insert any unsupported instructions by inserting their opcodes with the "db", "dw", and "dd" statements. Lines of assembler code can be freely interspersed with lines of BASIC code, although one must always consider the potential interactions between the two types of code.

PBWin and PBCC support object oriented programming in the form of COM classes, however the compilers do not force you to use OOP, it is merely an option. In process and out of process COM Servers can also be built using these compilers.

Both the Console Compiler and Windows Compiler can create graphic windows. The GRAPHICs statements are higher level than Windows' Graphics Device Interface (GDI) library functions.

GRAPHIC WINDOWS are dedicated dialogs each containing a single control which fills the dialog's client area. GRAPHIC controls are child windows which support the same GRAPHIC drawing functionality as GRAPHIC windows. GRAPHIC BITMAPS are also defined, again supporting the GRAPHIC drawing functionality, but as purely memory objects, like Windows bitmaps or DIB sections. Keyboard and mouse handling statements are included among the GRAPHIC statements. Character output to a GRAPHIC target uses fonts specified via the FONT NEW statement.

Using PB GRAPHIC statements, a GRAPHIC (WINDOW, BITMAP, or control) is first selected as the current GRAPHIC target, then operations are done on it without requiring it to be identified again. Contrast this with the GDI API approach, where the Device Context handle is required for every drawing operation. It is not necessary when using the PB GRAPHIC statements to define a brush or pen as a separate entity, nor is it necessary to redraw the GRAPHIC target (when in view) in response to Windows messages such as WM PAINT and WM ERASEBKGND. GRAPHIC targets are persistent. When GRAPHIC targets are attached, a REDRAW option can be specified which buffers the results of drawing operations until they are specifically requested. Using this technique reduces flicker in a similar way to the technique of drawing on memory DCs when using the GDI API. Pixel operations are possible using the GRAPHIC GET|SET PIXEL statements, in a manner similar to GetPixel/SetPixel of the GDI API. GRAPHIC GET BITS allows the entire bitmap to be loaded into a dynamic string. This can be manipulated either as a string or by mapping an array onto it. It can be placed back into the GRAPHIC target by GRAPHIC SET BITS.

The GRAPHIC statements contain all the commonly used GDI API functions, but if you need one that is not included it is possible to obtain the hDC of any GRAPHIC target and thereby use GDI API functions on it.

PowerBASIC provides an online forum for users to ask questions and share knowledge. On 8 July 2012 the forum had 5,623 members (only a fraction of them still active) and contained 50,093 threads comprising 408,642 posts since August 26, 1998. The Source Code section alone contained 3,768 threads.