Hi, GUI_MEMCPY --- This macro allows replacement of the memcpy function. but when I replace this macro like: #define GUI_MEMCPY(pSrc, pDest, NumBytes) GUI__memcpy(pSrc, pDest, NumBytes) It doesn't work it was never called by library. I did excatly as was written in PDF. Do you have solution for this problem? Thank you a lot