本文整理汇总了C++中IOTHUB_CLIENT_LL_HANDLE_DATA::IoTHubTransport_Subscribe方法的典型用法代码示例。如果您正苦于以下问题：C++ IOTHUB_CLIENT_LL_HANDLE_DATA::IoTHubTransport_Subscribe方法的具体用法？C++ IOTHUB_CLIENT_LL_HANDLE_DATA::IoTHubTransport_Subscribe怎么用？C++ IOTHUB_CLIENT_LL_HANDLE_DATA::IoTHubTransport_Subscribe使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类IOTHUB_CLIENT_LL_HANDLE_DATA的用法示例。
在下文中一共展示了IOTHUB_CLIENT_LL_HANDLE_DATA::IoTHubTransport_Subscribe方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: IoTHubClient_LL_SetMessageCallback
IOTHUB_CLIENT_RESULT IoTHubClient_LL_SetMessageCallback(IOTHUB_CLIENT_LL_HANDLE iotHubClientHandle, IOTHUB_CLIENT_MESSAGE_CALLBACK_ASYNC messageCallback, void* userContextCallback)
{
IOTHUB_CLIENT_RESULT result;
/*Codes_SRS_IOTHUBCLIENT_LL_02_016: [IoTHubClient_LL_SetMessageCallback shall fail and return IOTHUB_CLIENT_INVALID_ARG if parameter iotHubClientHandle is NULL.] */
if (iotHubClientHandle == NULL)
{
result = IOTHUB_CLIENT_INVALID_ARG;
LOG_ERROR;
}
else
{
IOTHUB_CLIENT_LL_HANDLE_DATA* handleData = (IOTHUB_CLIENT_LL_HANDLE_DATA*)iotHubClientHandle;
if (messageCallback == NULL)
{
/*Codes_SRS_IOTHUBCLIENT_LL_02_019: [If parameter messageCallback is NULL then IoTHubClient_LL_SetMessageCallback shall call the underlying layer's _Unsubscribe function and return IOTHUB_CLIENT_OK.] */
handleData->IoTHubTransport_Unsubscribe(handleData->deviceHandle);
handleData->messageCallback = NULL;
handleData->messageUserContextCallback = NULL;
result = IOTHUB_CLIENT_OK;
}
else
{
/*Codes_SRS_IOTHUBCLIENT_LL_02_017: [If parameter messageCallback is non-NULL then IoTHubClient_LL_SetMessageCallback shall call the underlying layer's _Subscribe function.]*/
if (handleData->IoTHubTransport_Subscribe(handleData->deviceHandle) == 0)
{
handleData->messageCallback = messageCallback;
handleData->messageUserContextCallback = userContextCallback;
result = IOTHUB_CLIENT_OK;
}
else
{
handleData->messageCallback = NULL;
handleData->messageUserContextCallback = NULL;
/*Codes_SRS_IOTHUBCLIENT_LL_02_018: [If the underlying layer's _Subscribe function fails, then IoTHubClient_LL_SetMessageCallback shall fail and return IOTHUB_CLIENT_ERROR. Otherwise IoTHubClient_LL_SetMessageCallback shall succeed and return IOTHUB_CLIENT_OK.]*/
result = IOTHUB_CLIENT_ERROR;
}
}
}
return result;
}