BCB5编写DLL、BCB5调用并写入解决办法

BCB5编写DLL、BCB5调用并写入
DLL：
1.cpp:
USEFORM("About2.cpp", Form2);
extern "C" __declspec(dllexport) __stdcall void About();
int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void* )
{
  return 1;
}
void __stdcall About()
{
  Form2 = new TForm2(NULL);
  Form2->ShowModal();
  delete Form2;
}
2.cpp:
TForm2 *Form2;
__fastcall TForm2::TForm2(TComponent* AOwner)
: TForm(AOwner)
{
}
void __stdcall About()
{
  Form2 = new TForm2(NULL);
  Form2->ShowModal();
  delete Form2;
}
void __fastcall TForm2::BitBtn1Click(TObject *Sender)
{
  Close();
}
调用：
void __fastcall TMainForm1::N5Click(TObject *Sender)
{
  HINSTANCE hInst = LoadLibrary("About.dll");
  if(hInst==NULL)  
  {  
  ShowMessage("Load dll error");  
  return;  
  }
  if (hInst){
  Beep();
  (FARPROC)About=GetProcAddress(hInst,"About");
  if(About==NULL)
  {
  FreeLibrary(hIst);  
  ShowMessage("Get function address error");  
  return;
  }  
  LPTSTR a,b,c,d;
  a="系统名称:";
  b="版 本：" ;
  c="版权：" ;
  d="备注：";
  About(a,b,c,d);
  }
  freeLibrary("About.dll");
}
请问：我在FORM2中设置Label1、2、3、4。想让Label1->Caption=a、Label2->Caption=b....Label4->Caption=d
DLL如何编写代码，弄了好几天也没成功。请各位高手帮忙了。

------解决方案--------------------

C/C++ code

extern "C" __declspec(dllexport) __stdcall void About(char *a,char*b,char*c,char*d);
void __stdcall About(char *a,char*b,char*c,char*d)
{
  Form2 = new TForm2(NULL);
  Form2->Label1->Caption=a;
Form2->Label2->Caption=b;
Form2->Label3->Caption=s;
Form2->Label4->Caption=d;
  Form2->ShowModal();
  delete Form2;
}