some problem on uisng dynamic library

["jianwen wang" <jianwen_wang at fastmail dot fm>]

I creat dll file from a simple source file ,use instruction :
   gcc -c file.c -o file.o
   gcc -shared -o file.dll file.c
And I want to used it in the main function to load the dll file
dynamically, using dlopen(),
dlsym().. :
   gcc -o main main.cpp

but the program doesn't run .

What's wrong with it ?
-- 
  Jianwen Wang
  jianwen_wang@fastmail.fm

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