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