在程序中注册OCX控件

procedure TForm1.Button1Click(Sender: TObject);
var
  astr:String;
  bstr:String;
  ProcAddr:Pointer;
  DllAddr:Integer;
begin
  od1.Execute;
  astr:=od1.FileName+chr(0);
  DllAddr:=LoadLibrary(PChar(astr));
  if DllAddr<>0 then
    begin
      bstr:='DllUnregisterServer'+chr(0);
      //只要将以上处改为DllRegisterServer即不注册ActiveX控件
      ProcAddr:=GetProcAddress(DllAddr,PChar(bstr));
      if ProcAddr<>nil then
        CallWindowProc(ProcAddr,DllAddr,0,0,0)
      else
          ShowMessage(od1.FileName+'不是有效的控件');
      FreeLibrary(DllAddr);
    end
  else
      ShowMessage(od1.FileName+'无法装载');
end;