[UOPL-Architect] Back ground work

[Thomas M. <tm...@bs...>]

We still have lots of back ground work to do for the project. Here is 
some stuff
to read

http://www.freepascal.org/docs.html

User.pdf

Chapter 9
Units that come with Free Pascal
Here we list the units that come with the Free Pascal distribution. 
Since there is a difference in the
supplied units per operating system, we first describe the generic ones, 
then describe those which are
operating specific.
9.1 Standard units
The following units are standard and are meant to be ported to all 
supported platforms by Free Pascal.
A brief description of each unit is also given.
crt This unit is similar to the unit of the same name of Turbo Pascal. 
It implements writing to the
console in color, moving the text cursor around and reading from the 
keyboard.
dos This unit provides basic routines for accessing the operating 
system. This includes file searching,
environment variables access, getting the operating system version, 
getting and setting
the system time. It is to note that some of these routines are 
duplicated in functionality in the
sysutils unit.
getopts This unit gives you the GNU getopts command-line arguments 
handling mechanism. It
also supports long options.
graph This unit provides basic graphics handling, with routines to draw 
lines on the screen, display
texts etc. It provides the same functions as the Turbo Pascal unit.
keyboard provides basic keyboard handling routines in a platform 
independent way, and supports
writing custom drivers.
math This unit contains common mathematical routines (trigonometric 
functions, logarithms, etc.)
as well as more complex ones (summations of arrays, normalization 
functions, etc.).
mmx This unit provides support for mmx extensions in your code.
mouse provides basic mouse handling routines in a platform independent 
way, and supports writing
custom drivers.
objects This unit provides the base object for standard Turbo Pascal 
objects. It also implements File
and Memory stream objects, as well as sorted and non-sorted collections, 
and string streams.
objpas is used for Delphi compatibility; you should never load this unit 
explicitly; it is automatically
loaded if you request Delphi mode.
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CHAPTER 9. UNITS THAT COME WITH FREE PASCAL
printer This unit provides all you need for rudimentary access to the 
printer using standard I/O
routines.
sockets This gives the programmer access to sockets and TCP/IP programming.
strings This unit provides basic string handling routines for the pchar 
type, comparable to similar
routines in standard C libraries.
system This unit is available for all supported platforms, even though 
the unit name may be different
(e.g : syslinux, sysos2). It includes among others, basic file I/O 
routines, memory management
routines, all compiler helper routines, and directory services routines.
sysutils is an alternative implementation of the sysutils unit of 
Delphi. It includes file I/O access
routines which takes care of file locking, date and string handling 
routines, file search, date
and string conversion routines.
typinfo Provides functions to acces Run-Time Type Information, just like 
Delphi.
video provides basic screen handling in a platform independent way, and 
supports writing custom
drivers.
9.2 Under DOS
emu387 This unit provides support for the coprocessor emulator.
go32 This unit provides access to possibilities of the GO32 DOS extender.
9.3 UnderWindows
wincrt This implements a console in a standard GUI window, contrary to 
the crt unit which is for
the Windows console only.
Windows This unit provides access to al Win32 API calls. Effort has been 
taken to make sure that
it is compatible to the Delphi version of this unit, so code for Delphi 
is easily ported to Free
Pascal.
opengl provides access to the low-level opengl functions in WINDOWS.
winmouse provides access to the mouse in WINDOWS.
ole2 provides access to the OLE capabilities of WINDOWS.
winsock provides acces to the WINDOWS sockets API Winsock.
9.4 Under Linux
linux This unit provides access to the LINUX operating system. It 
provides most file and I/O handling
routines that you may need. It implements most of the standard C library 
constructs that you
will find on a Unix system. If you do a lot of disk/file operations, the 
use of this unit is
recommended over the one you use under Dos.
graph Is an implementation of Borlands graph unit, which works on the 
Linux console. Its implementation
is as complete as on the other platforms (it shares the same code). It 
uses the
libvga and libvgagl graphics libraries, so you need these installed for 
this unit to work. Also,
programs using this library need to be run as root, or setuid root, and 
hence are a potential
security risk.
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CHAPTER 9. UNITS THAT COME WITH FREE PASCAL
ports This implements the various port[] constructs. These are provided 
for compatibility only,
and it is not recommended to use them extensively. Programs using this 
construct must be run
as ruit or setuid root, and are a serious security risk on your system.
9.5 Under OS/2
doscalls interface to doscalls.dll.
dive interface to dive.dll
emx provides access to the EMX extender.
pm* interface units for the program manager functions.
viocalls interface to viocalls.dll screen handling library.
moucalls interface to moucalls.dll mouse handling library.
kbdcalls interface to kbdcalls.dll keyboard handling library.
moncalls interface to moncalls.dll monitoring handling library.
9.6 Unit availability
Standard unit availability for each of the supported platforms is given 
in the FAQ / Knowledge base.

-- 
Thomas Miller
Wash DC Delphi SIG Chairperson
Delphi Client/Server Certified Developer
BSS Accounting & Distribution Software
BSS Enterprise Accounting FrameWork

http://www.bss-software.com
http://www.cpcug.org/user/delphi/index.html
https://sourceforge.net/projects/uopl/
http://sourceforge.net/projects/dbexpressplus