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Your code probably looks like :

std_msgs::UInt64 int_a;
volatile long unsigned int_b;
int_a = int_b;

But if you look at the message definition you'll see that there is a field data, so you have to use it to set the message value :

std_msgs::UInt64 int_a;
volatile long unsigned int int_b;
int_a.data = int_b;