Load shared library from ruby

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I have a stupid problem :

require 'dl/import'

dl = DL::dlopen('/root/[url removed, login to view]')

message =""

[url removed, login to view](message)

print message

but i have this error: undefined method

This is the c++ code:

void GetMessage(char* message)


char *pTemp = "Hello";

strcpy ( message, pTemp );


How i can resolve the problem?

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