Delphi 用DLL实现插件的简单实例
这是DLL的代码 实现代码： library MyDll; uses SysUtils, Dialogs, Cla
Delphi 用DLL实现插件的简单实例
这是DLL的代码
实现代码：
library MyDll;
uses
SysUtils,
Dialogs,
Classes;
procedure ShowInfo(info:PChar);stdcall;
begin
ShowMessage('您选择了【'+info+'】');
end;
function GetCaption:Pchar;
begin
Result := '中国';
end;
exports ShowInfo,
GetCaption;
{$R *.res}
begin
end.
这是调用窗体的代码
本例只使用了一个DLL，所以当有多个DLL时，需要循环DLL所在目录，依次加载DLL
unit Main;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, Menus, ExtCtrls;
type
TShowInfo = procedure (info:PChar);stdcall;
TGetCaption = function : PChar;stdcall;
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
MainMenu1: TMainMenu;
Image1: TImage;
procedure Button2Click(Sender: TObject); private
{ Private declarations }
FHandel : THandle; //DLL句柄
FProAddress: Pointer; //DLL中ShowInfo的地址
showinfo: TShowInfo; //为动态加载DLL而设
procedure LoadPlusIn; //加载插件（DLL）
procedure ItemClick(Sender: TObject); //自定义菜单点击事件
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button2Click(Sender: TObject);
begin
LoadPlusIn;
end;
procedure TForm1.ItemClick(Sender: TObject);
begin
@showinfo := FProAddress; //取地址
if @showinfo <> nil then
showinfo(PWideChar(TMenuItem(Sender).Caption)); //执行DLL中的ShowInfo
end;
procedure TForm1.LoadPlusIn;
var
getcaption: TGetCaption;
item : TMenuItem;
begin
FHandel := LoadLibrary('MyDll.dll'); //加载
if FHandel = 0 then
begin
ShowMessage('加载失败！');
Exit;
end
else
begin
@getcaption := GetProcAddress(FHandel,'GetCaption'); //取DLL中GetCaption地址
if @getcaption <> nil then
begin
item := TMenuItem.Create(MainMenu1); //创建一个菜单
item.Caption := getcaption; //取Caption，即调用DLL中的GetCaption
FProAddress := GetProcAddress(FHandel,'ShowInfo'); //取得DLL中ShowInfo的地址
item.OnClick := ItemClick; //赋予菜单项的点击事件
MainMenu1.Items.Add(item); //添加到主菜单
end;
end;
end;
end.
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