delphi dll的两种调用方式

最新推荐文章于 2016-04-26 19:13:56 发布

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本文探讨了Delphi中DLL的两种调用方式：动态调用和静态调用。动态调用需要先定义函数，然后在运行时通过函数接口地址调用；而静态调用则是在编译时直接将DLL函数链接到程序中。

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unit TestDLL_Pas;

interface

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

type
TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Button2: TButton;
    Edit3: TEdit;
    Edit4: TEdit;
    CheckBox1: TCheckBox;
    Button3: TButton;
    Edit5: TEdit;
    Edit6: TEdit;
    Edit7: TEdit;
    Edit8: TEdit;
    Button4: TButton;
    CheckBox2: TCheckBox;
    Button5: TButton;
    Button6: TButton;
    Edit9: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
private
    { Private declarations }
public
    { Public declarations }
end;

var
Form1: TForm1;
_DLLMoudle: THandle;

//动态调用方式、先定义函数、后面在通过Button5Click过程调入个函数接口地址

_GetPassWord:function (Pass:string):string;stdcall;
_CheckPassWord:Function(SourcePass:string;EncryPass:string):boolean;stdcall;
_StrEncrypt:Function(s: string; key: word): string;StdCall;
_StrDecrypt:Function(s: string; key: word): string;StdCall;
_GetRegistCode:Function(Pass:string):String;StdCall;
_CheckRegistCode:Function(CompanyName,RegistCode:string):Boolean;StdCall;

//下面为静态调用方式

function GetPassWord(Pass:string):ShortString;stdcall;external 'MyHRDLL.dll';
function CheckPassWord(SourcePass,EncryPass:string):Boolean;stdcall;external 'MyHRDLL.dll';
function StrEncrypt(s: string; key: word): ShortString;stdcall;external 'MyHRDLL.dll';
function StrDecrypt(s: string; key: word): ShortString;stdcall;external 'MyHRDLL.dll';
function GetRegistCode(Pass:string):ShortString;stdcall;external 'MyHRDLL.dll';
function CheckRegistCode(CompanyName,RegistCode:string):Boolean;stdcall;external 'MyHRDLL.dll';

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
Edit2.Text := GetPassWord(Edit1.Text);
end;

procedure TForm1.Button2Click(Sender: TObject);
var
_bool :Boolean;
begin
_Bool := CheckRegistCode(Edit3.Text,Edit4.Text);
CheckBox1.Checked := _bool;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
edit6.Text := GetRegistCode(edit5.Text);
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
CheckBox2.Checked := CheckPassWord(Edit7.Text,edit8.Text);
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
   try
     _DLLMoudle := Loadlibrary('MyHRDLL.dll');
     ShowMessage('初始化成功!!!');
   except
     ShowMessage('初始化失败!!!');
     Exit;
   end;
   if _DLLMoudle > 32 then begin
      Try
        @_GetPassWord:=GetProcAddress(_DLLMoudle,'GetPassWord');              //打开串口
        @_CheckPassWord:=GetProcAddress(_DLLMoudle,'CheckPassWord');            //关闭串口
        @_StrEncrypt:=GetProcAddress(_DLLMoudle,'StrEncrypt');            //对卡号冲值
        @_StrDecrypt:=GetProcAddress(_DLLMoudle,'StrDecrypt');                //删除卡号
        @_GetRegistCode:=GetProcAddress(_DLLMoudle,'GetRegistCode');      //终端机清除刷卡记录
        @_CheckRegistCode:=GetProcAddress(_DLLMoudle,'CheckRegistCode');            //
        ShowMessage('DLL装载成功.............');
      Except
        ShowMessage('出错!!DLL打开失败!!不能做其他操作!!');
      End
   end;
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
edit9.Text := FormatDateTime('MMDDHHNN',Now);
end;

end.