使用动态包导出函数的调用单元完整源代码

本文链接：https://blog.youkuaiyun.com/kingup/article/details/6027422

本文介绍了一个使用Delphi动态加载BPL包的示例程序，展示了如何通过LoadPackage和GetProcAddress来调用BPL包内的过程及函数，并在调用完成后卸载BPL包。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

unit uMainFrm;

interface

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

type
TMainForm = class(TForm)
    btnPkgForm: TButton;
    medtOp1: TMaskEdit;
    medtOp2: TMaskEdit;
    btnAdd: TButton;
    lblResult: TLabel;
    procedure btnPkgFormClick(Sender: TObject);
    procedure btnAddClick(Sender: TObject);
private
    { Private declarations }
public
    { Public declarations }
end;
//Defined the method signatures
TAddEmProc = function(Op1, Op2 : Integer) : Integer; stdcall;
TFunkFormProc = procedure; stdcall;
var
MainForm: TMainForm;
const
cFunkForm = 'FunkForm';
cAddEm = 'AddEm';
implementation

{$R *.dfm}

procedure TMainForm.btnAddClick(Sender: TObject);
var
PackageModule : THandle;
AddEmProc : TAddEmProc;
Rslt : Integer;
Op1, Op2 : Integer;
begin
PackageModule := LoadPackage('DdgRTFunk1.bpl');
try
    @AddEmProc := GetProcAddress(PackageModule, PChar(cAddEm));
    if not (@AddEmProc = nil) then
    begin
      Op1 := StrToInt(medtOp1.Text);
      Op2 := StrToInt(medtOp2.Text);
      Rslt := AddEmProc(Op1, Op2);
      lblResult.Caption := IntToStr(Rslt);
    end;
finally
    UnloadPackage(PackageModule);
end;
end;

procedure TMainForm.btnPkgFormClick(Sender: TObject);
var
PackageModule : THandle;
FunkFormProc : TFunkFormProc;
begin
PackageModule := LoadPackage('DdgRTFunk1.bpl');
try
    @FunkFormProc := GetProcAddress(PackageModule, PChar(cFunkForm));
    if not (@FunkFormProc = nil) then
    begin
      FunkFormProc;
    end;
finally
    UnloadPackage(PackageModule);
end;
end;

end.