delphi dll 静态调用和动态调用方法总结

dll 调用方法有 静态调用和动态调用两种方法

用到的dll为上篇文章所编写的dll.

总结如下：

Unit Unit1;

Interface

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

Type
  TForm1 = Class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Procedure Button1Click(Sender: TObject);
    Procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  End;

Var
  Form1: TForm1;
 
Implementation
Function  Min(X, Y: Integer): Integer; external 'Project1.dll';
Function Max(X, Y: Integer): Integer; external 'Project1.dll';
procedure SynAPP(App:THandle);stdcall;external 'Project1.dll'; //这里的
procedure ShowForm;stdcall;external 'Project1.dll';
procedure showmyform;stdcall;external 'Project1.dll';
{$R *.dfm}

Procedure TForm1.Button1Click(Sender: TObject);
Begin
  showmessage(inttostr(Min(1, 100)));//静态方法
  showmessage(inttostr(Max(1, 100)));//静态方法
End;

//动态方法

Procedure TForm1.Button2Click(Sender: TObject);
Type
  Tmax = Function(X, Y: Integer): Integer;
  THandle = Integer;
Var
  mymax: Tmax;
  Handle: THandle;

Begin
  Handle := LoadLibrary('Project1.dll');

  @mymax := GetProcAddress(Handle, 'Max');
  showmessage(inttostr(mymax(1, 100)));

  FreeLibrary(Handle);
End;


procedure TForm1.Button3Click(Sender: TObject);
begin
  // SynAPP(Application.Handle);
  showmyform ;//静态方法
  //ShowForm ;
end;

End.