dll调用（一）

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.Buttons;

type
  TForm1 = class(TForm)
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    Memo1: TMemo;
    Button1: TButton;
    procedure BitBtn1Click(Sender: TObject);
    procedure BitBtn2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
    isHookInstalled:Boolean;
  public
    { Public declarations }
  end;

  {DLL 中的函数声明}
  function SetHook: Boolean; stdcall;
  function DelHook: Boolean; stdcall;
  procedure PrintHook;stdcall;

 

var
  Form1: TForm1;

implementation

{$R *.dfm}
{DLL 中的函数实现, 也就是说明来自那里, 原来叫什么名}
function SetHook; external 'KeyboardHook.dll' name 'SetHook';
function DelHook; external 'KeyboardHook.dll' name 'DelHook';
procedure PrintHook; external 'KeyboardHook.dll' name 'PrintHook';

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
   Self.BitBtn1.Enabled:=False;
   Self.BitBtn2.Enabled:=True;
   Self.Button1.Enabled:=True;

   if SetHook then
   begin
     isHookInstalled:=True;
     Self.Memo1.Lines.Add('键盘钩子已安装。。。');
   end;
end;

procedure TForm1.BitBtn2Click(Sender: TObject);
begin
   if DelHook then
   begin
    isHookInstalled:=False;
    Self.Memo1.Lines.Add('键盘钩子已撤销！！！');
    Self.Memo1.Lines.Add(' ');
   end;

   Self.BitBtn1.Enabled:=True;
   Self.BitBtn2.Enabled:=False;
   Self.Button1.Enabled:=False;
end;

 

procedure TForm1.Button1Click(Sender: TObject);
begin
   PrintHook;
   Self.Memo1.Lines.Add('已打印');
end;

end.