DLL 的靜態調用實例代碼

 自己寫了一MinMax.dll文件 裏面定義了2個函數Min、Max

 

在測試中使用了靜態調用的方法

 

完整代碼如下：

----------------------------------------

unit unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, Buttons;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
uses unit3;
function min(x,y:integer):integer;stdcall; external 'Minmax.dll' name 'Min';
function max(x,y:integer):integer;stdcall; external 'Minmax.dll' name 'Max';

procedure TForm1.Button1Click(Sender: TObject);
var
  x,y,mi,ma:integer;
begin
  if (edit1.Text ='') or (edit2.Text ='') then
    showmessage('X或Y值爲空！')
  else
  begin
    x:=strtoint(trim(edit1.Text) );
    y:=strtoint(trim(edit2.Text) );
    mi:=min(x,y);
    ma:=max(x,y);
    Memo1.Lines.Clear ;
    Memo1.Lines.Add ('最小值:'+inttostr(mi));
    Memo1.Lines.Add ('最大值:'+inttostr(ma));
  end;
end;

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
  Form3:=TForm3.Create(Form1);
  Form3.ShowModal ;
end;

end.

-----------------------------------

MinMax.dll文件源碼如下：

 

library Minmax;

{ 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 Min(x,y:integer):integer;stdcall ;
begin
  if (x<y) then
    Min:=x
  else
    Min:=y;
end;

function Max(x,y:integer):integer;stdcall ;
begin
  if (x>y) then
    Max:=x
  else
    Max:=y;
end;
exports Min,Max;
begin
end.
------------------------------

 

2009-11-04