unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
//晚綁定，也就是動態(tài)調(diào)用外部函數(shù)主要用以下三個命令：
//LoadLibrary：獲取 DLL
//GetProcAddress：獲取函數(shù)
//FreeLibrary：釋放
//定義一個過程類型，參數(shù)要和需要的函數(shù)一致
TMB = function(hWnd: HWND; lpText, lpCaption: PChar; uType: UINT): Integer; stdcall;
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
MB: TMB; {聲明函數(shù) MB}
inst: LongWord; {聲明一個變量來記錄要使用的 DLL 句柄}
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
inst := LoadLibrary('user32.dll');
if inst <> 0 then
MB := GetProcAddress(inst, 'MessageBoxW');
end;
//調(diào)用測試：
procedure TForm1.Button1Click(Sender: TObject);
var
t,b: PChar;
begin
t := '標(biāo)題';
b := '內(nèi)容';
MB(0, b, t, 0);
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
FreeLibrary(inst); {記得釋放}
end;
end.