On 8/6/12, Eyyub <eyyub.pangearaion at gmail.com> wrote: > Tell me if I'm wrong. (I did not programming in C since 2 years) You're not wrong. m_blockList is a pointer and OP needs to allocate an s_blockHeader instance before he uses it: s_blockHeader* m_blockList = cast(s_blockHeader*)malloc(s_blockHeader.sizeof);