DT_CALCRECT

	    SIZE TextRect = { 0 };
			RECT textrect = { 0 };
			GetClientRect(hWnd, &rect);
			textrect = rect;
			DrawText(hdc, buff, -1, &textrect,  DT_CALCRECT);
			float rowCount = ((float)textrect.right / (float)(rect.right - rect.left)) + 0.9999;
			rect.top += ((rect.bottom - rect.top)  - (textrect.bottom *(int)rowCount))/ 2;
			DrawText(hdc, buff, -1, rect, DT_CENTER | DT_WORDBREAK | DT_EXPANDTABS);
			SelectObject(hdc, hOldFont);
			::SetTextColor(hdc, oldtxtColor);
			::SetBkMode(hdc, oldMode);