Merge branch '89-catch_exc_in_C_API'

Catch communication exceptions in C API to avoid crash.
Fixes #89

Author: szszszsz

NK_C_API.cc

@@ -64,6 +64,9 @@ uint8_t * get_with_array_result(T func){
     catch (LibraryException & libraryException){
         NK_last_command_status = libraryException.exception_id();
     }
+    catch (const DeviceCommunicationException &deviceException){
+      NK_last_command_status = 256-deviceException.getType();
+    }
     return nullptr;
 }
 
@@ -79,6 +82,9 @@ const char* get_with_string_result(T func){
     catch (LibraryException & libraryException){
         NK_last_command_status = libraryException.exception_id();
     }
+    catch (const DeviceCommunicationException &deviceException){
+      NK_last_command_status = 256-deviceException.getType();
+    }
     return "";
 }
 
@@ -94,6 +100,9 @@ auto get_with_result(T func){
     catch (LibraryException & libraryException){
         NK_last_command_status = libraryException.exception_id();
     }
+    catch (const DeviceCommunicationException &deviceException){
+      NK_last_command_status = 256-deviceException.getType();
+    }
     return static_cast<decltype(func())>(0);
 }
 
@@ -140,6 +149,11 @@ extern "C" {
 			NK_last_command_status = commandFailedException.last_command_status;
 			return commandFailedException.last_command_status;
 		}
+    catch (const DeviceCommunicationException &deviceException){
+      NK_last_command_status = 256-deviceException.getType();
+      cerr << deviceException.what() << endl;
+      return 0;
+    }
 		catch (std::runtime_error &e) {
 			cerr << e.what() << endl;
 			return 0;