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CPASDEMO.PAS
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Pascal/Delphi Source File
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1988-08-29
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4KB
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126 lines
{ Copyright (c) 1987,88 by Borland International, Inc. }
program CPASDEMO;
(*
This program demonstrates how to interface Turbo Pascal and Turbo C.
Turbo C is used to generate an .OBJ file (CPASDEMO.OBJ). Then
this .OBJ is linked into this Turbo Pascal program using the {$L}
compiler directive.
NOTES:
1. Data declared in the Turbo C module cannot be accessed from
the Turbo Pascal program. Shared data must be declared in
Pascal.
2. If the C functions are only used in the implementation section
of a unit, declare them NEAR. If they are declared in the
interface section of a unit, declare them FAR. Always compile
the Turbo C modules using the small memory model.
3. Turbo C runtime library routines cannot be used because their
modules do not have the correct segment names. However, if you have
the Turbo C runtime library source (available from Borland),
you can use individual library modules by recompiling
them using CTOPAS.BAT. If you do recompile them, make sure
that you include prototypes in your C module for all C
library functions that you use.
4. Some of the code that Turbo C generates are calls to internal
routines. These cannot be used without recompiling the relevant
parts of the Turbo C runtime library source code.
In order to run this demonstration program you will need the following
files:
TCC.EXE and TURBO.CFG or
TC.EXE and CTOPAS.TC
To run the demonstration program CPASDEMO.EXE do the following:
1. First create a CPASDEMO.OBJ file compatible with Turbo Pascal 4.0
or later using Turbo C.
a) If you are using the Turbo C integrated environment (TC.EXE)
then at the DOS prompt execute:
TC /CCTOPAS.TC CPASDEMO.C
then create the .OBJ file by pressing ALT-F9.
b) If you are using the Turbo C command line version (TCC.EXE)
then at the DOS prompt execute:
TCC CPASDEMO.C
Note: Use the same configuration file (TURBO.CFG or CTOPAS.TC)
when you create your own Turbo C modules for use with
Turbo Pascal
2. Compile and execute the Turbo Pascal program CPASDEMO.PAS
This simple program calls each of the functions defined in the Turbo C
module. Each of the Turbo C functions changes the current display color
by calling the Turbo Pascal procedure SetColor. }
*)
uses Crt;
var
Factor : Word;
{$L CPASDEMO.OBJ} { link in the Turbo C-generated .OBJ module }
function Sqr(I : Integer) : Word; external;
{ Change the text color and return the square of I }
function HiBits(W : Word) : Word; external;
{ Change the text color and return the high byte of W }
function Suc(B : Byte) : Byte; external;
{ Change the text color and return B + 1 }
function Upr(C : Char) : Char; external;
{ Change the text color and return the upper case of C }
function Prd(S : ShortInt) : ShortInt; external;
{ Change the text color and return S - 1 }
function LoBits(L : LongInt) : LongInt; external;
{ Change the text color and return the low word of L }
procedure StrUpr(var S : string); external;
{ Change the text color and return the upper case of S - Note that the Turbo }
{ C routine must skip the length byte of the string. }
function BoolNot(B : Boolean) : Boolean; external;
{ Change the text color and return NOT B }
function MultByFactor(W : Word) : Word; external;
{ Change the text color and return W * Factor - note Turbo C's access of }
{ Turbo Pascal's global variable. }
procedure SetColor(NewColor : Byte); { A procedure that changes the current }
begin { display color by changing the CRT }
TextAttr := NewColor; { variable TextAttr }
end; { SetColor }
var
S : string;
begin
Writeln(Sqr(10)); { Call each of the functions defined }
Writeln(HiBits(30000)); { passing it the appropriate info. }
Writeln(Suc(200));
Writeln(Upr('x'));
Writeln(Prd(-100));
Writeln(LoBits(100000));
S := 'abcdefg';
StrUpr(S);
Writeln(S);
Writeln(BoolNot(False));
Factor := 100;
Writeln(MultbyFactor(10));
SetColor(LightGray);
end.