func TransactionSetCategory(id int64, category string) (int, error) {
	ccategory := C.CString(category)
	defer C.free(unsafe.Pointer(ccategory))
	return errNo(C.newrelic_transaction_set_category(C.long(id), ccategory))
}
func TransactionSetCategory(id int64, category string) (int, error) {
	ccategory := C.CString(category)
	defer C.free(unsafe.Pointer(ccategory))
	return errNo(C.newrelic_transaction_set_category(C.long(id), ccategory))
}
/*
 * Set transaction category name, e.g. Uri in WebTransaction/Uri/<txn_name>
 *
 * @param transaction_id  id of transaction
 * @param category  name of the transaction category
 * @return  0 on success, else negative warning code or error code
 */