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0043_SEC20-BORLAND.pas
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Pascal/Delphi Source File
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1995-02-28
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2KB
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59 lines
SECTION 20 - Networks
This document contains information that is most often provided
to users of this section. There is a listing of common
Technical Information Documents that can be downloaded from the
libraries, and a listing of the five most frequently asked
questions and their answers.
TI555 File and record locking in Turbo Pascal
TI1201 Installing Turbo Pascal on a network
Q. "How do I open a file in read only mode?"
A. Turbo Pascal gives you the ability to open files in several
different modes. Typically, you will want to change the
file mode after you call Assign but before you call Reset or
ReWrite. You make the change by assigning numerical values
to the built in FileMode variable.
Q. "What is the default value for FileMode? What values are
associated with a shared Read/Write mode and a shared Read
only mode."
A. By default, FileMode is set to 2. Set FileMode to 66 to
acheive a shared Read/Write mode, and set it to 64 to get a
shared Read only mode.
Q. "How can I implement file and record locking in my own
code?"
A. Turbo Pascal has no built in functions for file and record
locking, so you have to go to the assembler level (or
call MsDos/Intr) to implement this feature. With DOS
versions 3.0 and later, you can access file and record
locking via Interrupt $21, Service $5C, SubFunctions 0 and
1. (See TI555, and the next Q/A.).
Q. "Beside the method described above, is there a second way to
access file and record locking routines?"
A. Real world implementations of record and file locking tend
to be very complex to implement. As a result, it is standard
practice for programmers to gain access to this kind of
functionality by purchasing a ready made database toolkit
such as the Borland Database Engine (release date, summer
94), the B Tree Filer from Turbo Power software, or the
Paradox Engine.
Q. "How can I get access to Netware and other network
routines?"
A. Turbo Pascal provides no built in access to Netware or
other network functions other than the calls that are built
into Windows, such as WNetAddConnection,
WNetCancelConnection, and WNetGetConnection. In the
Compuserve library for Section 20 there are (as of May 94)
various toolkits available, such as the MAPI.ZIP and
TPAPI.ZIP files.