Sending Messages

SendMessage()

This section describes how to send messages synchronously. During the message sending process, other threads are blocked (in the waiting state). They are unblocked until the messages are sent successfully. You need to configure message subscription on the console first. For details, see the "Subscribing to Messages" section in HiLens User Guide. Only 1.0.7 to 1.2.2 versions are supported.

API calling
HiLensEC hilens::UploadBuffer(const std::string & subject, const std::string & message)

Parameter description

**Table 1** Parameters
Parameter	Description
subject	Email subject. This parameter is valid only when Email is set. The value can contain up to 170 characters.
message	Message content, which contains up to 85 characters.

Return values
If the return value is 0, the operation is successful. Otherwise, the operation fails. For details about the failure response parameters, see Error Codes.

SendMessageAsync()

This section describes how to send messages asynchronously. You need to configure message subscription on the console first. For details, see the "Subscribing to Messages" section in HiLens User Guide. Only 1.0.7 to 1.2.2 versions are supported.

API calling
HiLensEC hilens::UploadBuffer(const std::string & subject, const std::string & message, void (*callback)(int) = NULL)

Parameter description

**Table 2** Parameters
Parameter	Description
subject	Email subject. This parameter is valid only when Email is set. The value can contain up to 170 characters.
message	Message content, which contains up to 85 characters
callback	Callback function

Return values
If the return value is 0, the operation is successful. Otherwise, the operation fails. For details about the failure response parameters, see Error Codes.