Return serial number as uint32_t from C API

This patch adds the function NK_device_serial_number_as_u32 to the C
API.  It is similar to NK_device_serial_number but returns the raw
unsigned integer instead of a formatted string.  This patch also adds a
simple test case that ensures that the number is not zero.

Fixes #172.

1 files changed, 8 insertions, 0 deletions

diff --git a/NK_C_API.h b/NK_C_API.h
index d5c54a3..df3e992 100644
--- a/NK_C_API.h
+++ b/NK_C_API.h
@@ -386,6 +386,14 @@ extern "C" {
 	NK_C_API char * NK_device_serial_number();
 
 	/**
+	 * Return the device's serial number string as an integer.  Use
+         * NK_last_command_status to check for an error if this function
+         * returns zero.
+	 * @return device's serial number as an integer
+	 */
+	NK_C_API uint32_t NK_device_serial_number_as_u32();
+
+	/**
 	 * Get last command processing status. Useful for commands which returns the results of their own and could not return
 	 * an error code.
 	 * @return previous command processing error code