screenshot wird nicht richtig gemacht

[Simon123]

die "Breite" stimmt, die "Höhe" auch - jedoch nicht die "Anfangsposition" ... der Screenshot wird also etwas verschoben ... warum?

HWND hWnd = (HWND)StrToInt(worte->Strings[2]);
       HDC DC = GetDC(hWnd);
       RECT rc;
       if (GetWindowRgn(hWnd,&rc) || GetWindowRect(hWnd, &rc))
       {
          Form1->HandleWindow->Picture->Bitmap->FreeImage();
          HandleWindow->Picture->Bitmap->Handle = CreateCompatibleBitmap(DC, rc.right-rc.left, rc.bottom-rc.top);

          if (GetDeviceCaps(DC, RASTERCAPS) & RC_PALETTE)
          {
             int palette_size = GetDeviceCaps(DC, SIZEPALETTE);
             if (palette_size == 256)
             {
                const size_t size = sizeof(LOGPALETTE) + (palette_size-1) * sizeof(PALETTEENTRY);
                unsigned char* pBuffer = new unsigned char[size];

                LPLOGPALETTE lplogpal = reinterpret_cast<LPLOGPALETTE>(pBuffer);
                lplogpal->palVersion = 0x300;
                lplogpal->palNumEntries = palette_size;
                GetSystemPaletteEntries(DC, 0, palette_size, lplogpal->palPalEntry);

                HandleWindow->Picture->Bitmap->Palette = CreatePalette(lplogpal);
                delete [] pBuffer;
             }
          }

          BitBlt(HandleWindow->Picture->Bitmap->Canvas->Handle, 0, 0,
                 HandleWindow->Width, HandleWindow->Height,
                 DC, 0, 0, SRCCOPY);

          ReleaseDC(Handle, DC);

Bitte HIIILFE!