Вернуть TBitmap из .dll

__declspec(dllexport) TBitmap* __stdcall GetBmpDx(int X, int Y, int width, int height);
__declspec(dllexport) TBitmap* __stdcall GetBmpGdi(HDC hdc, int X, int Y, int width, int height);
 
__declspec(dllexport) TBitmap* __stdcall GetBmpGdi(HDC hdc, int X, int Y, int width, int height)
{
        bitmap->Width = width; // битмап создается ранее, с указанием bitmap->PixelFormat = pf24bit; 
    bitmap->Height = height;
    BitBlt(bitmap->Canvas->Handle, 0, 0, width, height, hdc, X, Y, SRCCOPY);
    return bitmap;
}

TBitmap* (__stdcall *GetBmpDx)(int X, int Y, int width, int height);
TBitmap* (__stdcall *GetBmpGdi)(HDC hdc, int X, int Y, int width, int height);

GetBmpGdi = (TBitmap * (__stdcall*)(HDC, int, int, int, int))GetProcAddress(dllhandle, "GetBmpGdi");

Form2->Image1->Picture->Bitmap = graphicsHelper.GetBitmap(); // это обертка над GetBmpGdi()

bitmap = new TBitmap; // PixelFormat = pf24bit; 
bitmap = GetBitmap();   // это обертка над GetBmpGdi()
TRGBTriple *ptr;
int y = 1;
ptr = reinterpret_cast<TRGBTriple*>(bitmap->ScanLine[y]);

   Graphics::TBitmap *Bmp = new Graphics::TBitmap;
   Bmp->PixelFormat = pf24bit;
   . . .

    bitmap->SaveToFile("bit.bmp");

bitmap = new TBitmap;
bitmap->Width = gRectWindowSize.right;
bitmap->Height = gRectWindowSize.bottom;
........
bitmap->SaveToFile("bit.bmp");
delete(bitmap);

void __fastcall TForm1::Button3Click(TObject *Sender)
{
     if(!Bmp) Bmp = new Graphics::TBitmap;
       Bmp->PixelFormat = pf24bit;
       Bmp->Width = 105; Bmp->Height = 105;
       Bmp->SaveToFile("proba.bmp");
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button4Click(TObject *Sender)
{
     delete Bmp; Bmp=NULL;
}

Graphics::TBitmap *pBitmap = new Graphics::TBitmap();
pBitmap = GetBitmap();
bitmap->SaveToFile("bmp.bmp");

Graphics::TBitmap *pBitmap = new Graphics::TBitmap();
pBitmap = GetBitmap();
bitmap->SaveToFile("bmp.bmp");
delete (pBitmap);