OpenEuphoria

Pass C double to Eu shared library

• Posted by Jerome May 11, 2012
• 1558 views

I have a shared library made with EU 4 that I would like to access from C by passing an array of doubles. Looking through the manual I found this:

Euphoria shared dynamically loading library can also be used by C programs as long as only 31-bit integer values are exchanged.  
If a 32-bit pointer or integer must be passed, and you have the source to the C program, you could pass the value in  
two separate 16-bit integer arguments (upper 16 bits and lower 16 bits), and then combine the values in the Euphoria  
routine into the desired 32-bit atom.  

Is there a clean way to do this?

My current code is essentially the following:

-- Eu Code 
export function MyFunc(sequence x) 
  ? x 
end function 

// C Code 
extern MyFunc(double x[]) 
 
int main() { 
double x[4] = {1.1,2.2,3.3,4.4}; 
MyFunc(x); 
return 0; 
} 

Thanks,
Ira