How to catch scm_c_eval_string in my application?

["xiaofeng xu" <kelvenxu gmail com>]

I use guile extern in application. I use scm_c_eval_string to explicte the _expression_ of guile and catch error by scm_interneral_catch and scm_handle_by_message_noexit. But it prints error messages to standard error device. 
Can I catch the error messages in my codes? Can someone help me ? Thank you!