From: ts Date: 2004-11-30T23:08:54+09:00 Subject: Re: How to implement set_trace_func callback in C/C++? >>>>> "S" == Stephen Kellett writes: S> Here is my code, where v is the VALUE from argv[4] S> if (v != Qnil) S> { S> struct BLOCK *blk; S> blk = (struct BLOCK *)v; Data_Get_Struct(v, struct BLOCK, blk); Guy Decoux