动态加载DLL

unit DynLoad;

interface

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

type
THandle = integer;
TAdd10 = function(number:integer):integer; stdCall;
TForm1 = class(TForm)
Label1: TLabel;
Edit1: TEdit;
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
temp:integer;
handle:THandle ;
FPointer: TFarProc;
MyFunc : TAdd10 ;
begin
try
temp := StrToInt(Edit1.Text );
handle := LoadLibrary('MyFirstDLL'); {装载DLL到内存}
if handle <> 0 then
try
FPointer := GetProcAddress(handle ,'Add10'); {获得函数的入口地址}
if FPointer <> nil then
begin
MyFunc := TAdd10(FPointer) ;
temp := MyFunc(temp) ; {使用函数操作}
Edit1.Text := IntToStr(temp);
end;
finally
FreeLibrary(handle); {释放DLL}
end
else
ShowMessage('未找到动态链接库MyFirstDLL.dll');
except
ShowMessage('请输入一个整数！');
end;
end;

end.