convert from unsigned char array to long c -

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I read from a binary file in an unsigned four buffer using fread for a long time.

Now I get a long time, how can I do it? 

  Unsigned four buffer [sizeof (long)]; Fred (buffer, size (long), 1, my_file);   
 Thanks!   
 
 
 Definitely mean to you:  
  long buffer; Fred (and buffer, size (long), 1, my_file);

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