dll创建和调用的简单例子: Dll工程的代码: library Project1;{ Important note about DLL memory management: ShareMem must be the first unit in your library's USES clause AND your project's (select Project-View Source) USES clause if your DLL exports any procedures or functions that pass strings as parameters or function results. This applies to all strings passed to and from your DLL--even those that are nested in records and classes. ShareMem is the interface unit to the BORLNDMM.DLL shared memory manager, which must be deployed along with your DLL. To avoid using BORLNDMM.DLL, pass string information using PChar or ShortString parameters. }uses SysUtils, Classes;{$R *.res} function NumberEquals( const numberA,numberB:Integer):Integer;stdCall; begin if numbera = numberb then result:=1 else result:=0;end; function Min(X, Y: Integer): Integer;stdcall;export; begin if X < Y then Result := X else Result := Y; end; function Max(X, Y: Integer): Integer;stdcall;export; begin if X > Y then Result := X else Result := Y; end; //函数输出口定义 exports NumberEquals , Min , Max ; begin end. 调用Dll的工程代码: unit Unit1;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;type TForm1 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end;var Form1: TForm1;implementation{$R *.dfm} function Min(X, Y: Integer): Integer; export;stdCall;external 'Project1.dll'; function Max(X, Y: Integer): Integer; export;stdCall;external 'Project1.dll'; function NumberEquals( const numberA,numberB:Integer):Integer;stdCall; external 'Project1.dll'; procedure TForm1.Button1Click(Sender: TObject); begin caption:=inttostr(Min(2,3)); showmessage(inttostr(Max(2,3))); showmessage(inttostr(NumberEquals(5,4))); end;end.
exports 导出函数
Dll工程的代码:
library Project1;{ Important note about DLL memory management: ShareMem must be the
first unit in your library's USES clause AND your project's (select
Project-View Source) USES clause if your DLL exports any procedures or
functions that pass strings as parameters or function results. This
applies to all strings passed to and from your DLL--even those that
are nested in records and classes. ShareMem is the interface unit to
the BORLNDMM.DLL shared memory manager, which must be deployed along
with your DLL. To avoid using BORLNDMM.DLL, pass string information
using PChar or ShortString parameters. }uses
SysUtils,
Classes;{$R *.res}
function NumberEquals( const numberA,numberB:Integer):Integer;stdCall;
begin
if numbera = numberb then
result:=1
else
result:=0;end;
function Min(X, Y: Integer): Integer;stdcall;export;
begin
if X < Y then
Result := X
else
Result := Y;
end;
function Max(X, Y: Integer): Integer;stdcall;export;
begin
if X > Y then
Result := X
else
Result := Y;
end;
//函数输出口定义
exports
NumberEquals ,
Min ,
Max ;
begin
end.
调用Dll的工程代码:
unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.dfm}
function Min(X, Y: Integer): Integer; export;stdCall;external 'Project1.dll';
function Max(X, Y: Integer): Integer; export;stdCall;external 'Project1.dll';
function NumberEquals( const numberA,numberB:Integer):Integer;stdCall; external 'Project1.dll';
procedure TForm1.Button1Click(Sender: TObject);
begin
caption:=inttostr(Min(2,3));
showmessage(inttostr(Max(2,3)));
showmessage(inttostr(NumberEquals(5,4)));
end;end.