DLL_Delphi动态调用

1、动态调用DLL

unit formMain;

interface

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

type
  TfrmMain = class(TForm)
    btnLoadLibrary: TButton;
    procedure btnLoadLibraryClick(Sender: TObject);
  private
    { Private declarations }
  public
    procedure LoadDllZ;
  end;

  TfnC_ExecJS = function(_pSvgFrm :Pointer; _pcJS :PChar):integer;stdcall;
  TfnD_PassStId = function(_Sender :Pointer; _pcStId :PChar):integer;stdcall;

var
  frmMain: TfrmMain;
// ***
  g_fnExecJS : TfnC_ExecJS;
  g_fnPassStId :TfnD_PassStId;

implementation

{$R *.dfm}

{ TfrmMain }

procedure TfrmMain.LoadDllZ;
var hDll :Cardinal;
    iRtn :integer;
begin
  hDll := LoadLibrary(PChar('DrRemoteCall.dll'));
  if hDll = 0 then
  begin
    Exit;
  end;
  
  @g_fnExecJS := GetProcAddress(hDll, 'ExecJS');
  @g_fnPassStId := GetProcAddress(hDll, 'PassStId');

  if not Assigned( g_fnExecJS ) then
  begin
    FreeLibrary(hDll);
    Exit;
  end;
  if not Assigned( g_fnPassStId ) then
  begin
    FreeLibrary(hDll);
    Exit;
  end;

  // ZC: 调用函数
  iRtn := g_fnExecJS(nil, 'TestCC');

  FreeLibrary(hDll);
  ShowMessage('out');
end;

procedure TfrmMain.btnLoadLibraryClick(Sender: TObject);
begin
  LoadDllZ;
end;

end.

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