static const unsigned char* RetrieveMessagePayload(IOTHUB_MESSAGE_HANDLE messageHandle, size_t* length)
{
const unsigned char* result;
IOTHUBMESSAGE_CONTENT_TYPE contentType = IoTHubMessage_GetContentType(messageHandle);
if (contentType == IOTHUBMESSAGE_BYTEARRAY)
{
if (IoTHubMessage_GetByteArray(messageHandle, &result, length) != IOTHUB_MESSAGE_OK)
{
LogError("Failure result from IoTHubMessage_GetByteArray\r\n");
result = NULL;
*length = 0;
}
}
else if (contentType == IOTHUBMESSAGE_STRING)
{
result = (const unsigned char*)IoTHubMessage_GetString(messageHandle);
if (result == NULL)
{
LogError("Failure result from IoTHubMessage_GetString\r\n");
result = NULL;
*length = 0;
}
else
{
*length = strlen((const char*)result);
}
}
else
{
result = NULL;
*length = 0;
}
return result;
}
static IOTHUBMESSAGE_DISPOSITION_RESULT receive_msg_callback(IOTHUB_MESSAGE_HANDLE message, void* user_context)
{
(void)user_context;
const char* messageId;
const char* correlationId;
// Message properties
if ((messageId = IoTHubMessage_GetMessageId(message)) == NULL)
{
messageId = "<unavailable>";
}
if ((correlationId = IoTHubMessage_GetCorrelationId(message)) == NULL)
{
correlationId = "<unavailable>";
}
IOTHUBMESSAGE_CONTENT_TYPE content_type = IoTHubMessage_GetContentType(message);
if (content_type == IOTHUBMESSAGE_BYTEARRAY)
{
const unsigned char* buff_msg;
size_t buff_len;
if (IoTHubMessage_GetByteArray(message, &buff_msg, &buff_len) != IOTHUB_MESSAGE_OK)
{
(void)printf("Failure retrieving byte array message\r\n");
}
else
{
(void)printf("Received Binary message\r\nMessage ID: %s\r\n Correlation ID: %s\r\n Data: <<<%.*s>>> & Size=%d\r\n", messageId, correlationId, (int)buff_len, buff_msg, (int)buff_len);
}
}
else
{
const char* string_msg = IoTHubMessage_GetString(message);
if (string_msg == NULL)
{
(void)printf("Failure retrieving byte array message\r\n");
}
else
{
(void)printf("Received String Message\r\nMessage ID: %s\r\n Correlation ID: %s\r\n Data: <<<%s>>>\r\n", messageId, correlationId, string_msg);
}
}
return IOTHUBMESSAGE_ACCEPTED;
}
static IOTHUBMESSAGE_DISPOSITION_RESULT ReceiveMessageCallback(IOTHUB_MESSAGE_HANDLE message, void* userContextCallback)
{
int* counter = (int*)userContextCallback;
const unsigned char* buffer = NULL;
size_t size = 0;
const char* messageId;
const char* correlationId;
// Message properties
if ((messageId = IoTHubMessage_GetMessageId(message)) == NULL)
{
messageId = "<null>";
}
if ((correlationId = IoTHubMessage_GetCorrelationId(message)) == NULL)
{
correlationId = "<null>";
}
// Message content
IOTHUBMESSAGE_CONTENT_TYPE contentType = IoTHubMessage_GetContentType(message);
if (contentType == IOTHUBMESSAGE_BYTEARRAY)
{
if (IoTHubMessage_GetByteArray(message, &buffer, &size) == IOTHUB_MESSAGE_OK)
{
(void)printf("Received Message [%d]\r\n Message ID: %s\r\n Correlation ID: %s\r\n BINARY Data: <<<%.*s>>> & Size=%d\r\n", *counter, messageId, correlationId, (int)size, buffer, (int)size);
}
else
{
(void)printf("Failed getting the BINARY body of the message received.\r\n");
}
}
else if (contentType == IOTHUBMESSAGE_STRING)
{
if ((buffer = (const unsigned char*)IoTHubMessage_GetString(message)) != NULL && (size = strlen((const char*)buffer)) > 0)
{
(void)printf("Received Message [%d]\r\n Message ID: %s\r\n Correlation ID: %s\r\n STRING Data: <<<%.*s>>> & Size=%d\r\n", *counter, messageId, correlationId, (int)size, buffer, (int)size);
}
else
{
(void)printf("Failed getting the STRING body of the message received.\r\n");
}
}
else
{
(void)printf("Failed getting the body of the message received (type %i).\r\n", contentType);
}
// Retrieve properties from the message
MAP_HANDLE mapProperties = IoTHubMessage_Properties(message);
if (mapProperties != NULL)
{
const char*const* keys;
const char*const* values;
size_t propertyCount = 0;
if (Map_GetInternals(mapProperties, &keys, &values, &propertyCount) == MAP_OK)
{
if (propertyCount > 0)
{
size_t index;
printf(" Message Properties:\r\n");
for (index = 0; index < propertyCount; index++)
{
printf("\tKey: %s Value: %s\r\n", keys[index], values[index]);
}
printf("\r\n");
}
}
}
(*counter)++;
/* Some device specific action code goes here... */
return IOTHUBMESSAGE_ACCEPTED;
}
static IOTHUBMESSAGE_DISPOSITION_RESULT ReceiveMessageCallback(IOTHUB_MESSAGE_HANDLE message, void* userContextCallback)
{
int* counter = (int*)userContextCallback;
const unsigned char* buffer = NULL;
size_t size = 0;
const char* messageId;
const char* correlationId;
// Message properties
if ((messageId = IoTHubMessage_GetMessageId(message)) == NULL)
{
messageId = "<null>";
}
if ((correlationId = IoTHubMessage_GetCorrelationId(message)) == NULL)
{
correlationId = "<null>";
}
// Increment the counter
*counter = (*counter) + 1;
// Message content
IOTHUBMESSAGE_CONTENT_TYPE contentType = IoTHubMessage_GetContentType(message);
if (contentType == IOTHUBMESSAGE_BYTEARRAY)
{
if (IoTHubMessage_GetByteArray(message, &buffer, &size) == IOTHUB_MESSAGE_OK)
{
(void)printf("Received Message [%d]\r\n Message ID: %s\r\n Correlation ID: %s\r\n BINARY Data: <<<%.*s>>> & Size=%d\r\n", *counter, messageId, correlationId, (int)size, buffer, (int)size);
}
else
{
(void)printf("Failed getting the BINARY body of the message received.\r\n");
}
}
else if (contentType == IOTHUBMESSAGE_STRING)
{
if ((buffer = (const unsigned char*)IoTHubMessage_GetString(message)) != NULL && (size = strlen((const char*)buffer)) > 0)
{
(void)printf("Received Message [%d]\r\n Message ID: %s\r\n Correlation ID: %s\r\n STRING Data: <<<%.*s>>> & Size=%d\r\n", *counter, messageId, correlationId, (int)size, buffer, (int)size);
// If we receive the work 'quit' then we stop running
}
else
{
(void)printf("Failed getting the STRING body of the message received.\r\n");
}
}
else
{
(void)printf("Failed getting the body of the message received (type %i).\r\n", contentType);
}
// Retrieve properties from the message
const char* property_key = "property_key";
const char* property_value = IoTHubMessage_GetProperty(message, property_key);
if (property_value != NULL)
{
printf("\r\nMessage Properties:\r\n");
printf("\tKey: %s Value: %s\r\n", property_key, property_value);
}
if (memcmp(buffer, "quit", size) == 0)
{
g_continueRunning = false;
}
/* Some device specific action code goes here... */
return IOTHUBMESSAGE_ACCEPTED;
}
