objective-c that can be called directly written in C language function?

objective-c that can be called directly written in C language function? Recently on the computer you want to write a C language feature extraction algorithms ported to iphone in an application, if you want to re-write the words is very troublesome, do not know can not directly call ah? ?
Reply:
You can use the C language.
However, the source code can be used only with the static library, you can not use dynamic libraries.
The problem is that the conversion package types and native C types.
Reply:
Oh, good. You can use the source code on the line.