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1. #ANDROID NDK SOCKET HOW TO#
2. #ANDROID NDK SOCKET INSTALL#
3. #ANDROID NDK SOCKET ANDROID#
4. #ANDROID NDK SOCKET SOFTWARE#
5. #ANDROID NDK SOCKET CODE#

W System.err: at .android.QtThread$1.run(QtThread. W System.err: at .android.QtNative$7.run(QtNative.java:633) W System.err: : no non-static method "Landroid/bluetooth/BluetoothAdapter. However, every time I run I end up with the following errors and no connection to the Bluetooth module. QDebug() ::of(&BluetoothClient::connected)) Ĭonnect(socket, &QBluetoothSocket::disconnected,this, &BluetoothClient::stopClient) Ĭonnect(socket,&QBluetoothSocket::errorOccurred,this, &BluetoothClient::onSocketErrorOccurred) Ĭonnect(this, &BluetoothClient::messageReceived,this, &BluetoothClient::onMessageRecieved ) QDebug() connectToService(remoteService) Socket = new QBluetoothSocket(QBluetoothServiceInfo::RfcommProtocol)

#ANDROID NDK SOCKET ANDROID#

It provides an API interface for external calls to create a daemon.Hi I have a simple bluetooth app running on Android 9 that borrowed from a previous example with void BluetoothClient::startClient(const QBluetoothServiceInfo &remoteService)

#ANDROID NDK SOCKET CODE#

OK, paste the code below! The first part is the Java part. Although it is not used temporarily, it can be prepared for emergency! The server program opens a TCP socket and waits for a client connection. In the implementation of this article, in order to Simple, the method of polling the PID of the parent process is still used, but the communication channel of the parent and child processes is still reserved. The app uses APIs provided by the Android NDK to handle touch events and app. One way to communicate between parent and child processes is to establish a communication channel between parent and child processes, and then perceive the existence of each other by monitoring this channel, so that there will not be the power consumption problem mentioned before.

Because the cycle is used here, the power consumption problem mentioned before is brought up. When it becomes 1, it means that the parent process has died, so the parent can be restarted. When the parent process dies, the child process becomes an orphan and is adopted by the Init process, so we can read the parent process PID of the child process in a loop.

#ANDROID NDK SOCKET HOW TO#

The child process (monitoring process) How to monitor the death of the parent process?

#ANDROID NDK SOCKET INSTALL#

Very simple, in Linux, when the child process is terminated, it will send the SIG_CHLD signal to the parent process, so we can install the signal processing function, and restart the creation of the monitoring process in this signal processing function Ģ. How does the parent process monitor the death of the child process (monitoring process)? In fact, these things themselves are not complicated technologies, but we combine them Get up to realize a dual-process guardian, not as mysterious as imagined! Before officially posting the code, let me talk about a few key points when implementing dual-process daemons:ġ. Unix domain socket to realize cross-process communication 3. The following knowledge points need to be understood: For programs that require dual-process protection, you only need to call the JAVA interface anywhere in the program. The method of implementing dual-process protection in this article is basically pure NDK development, or all is implemented in C++. In reality, it will increase the power consumption of the mobile phone! However, this article is just an introduction, I believe that after reading it, there will be more experts to point out better ways to achieve it. OpenSSL is an open source library implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS) protocols as well as a full-strength. This article introduces a way to implement dual-process protection with NDK, but first of all, the method to be introduced below will lose a lot of efficiency. What is a dual process daemon? As the name implies, the two processes monitor each other, and restart immediately when the other party is down! I don’t know if we should call such a pair of processes dependent on each other or difficult brothers, but in short, dual-process guarding is indeed a solution to the problem! I believe that at this point, many people are already eager to know how to implement dual-process guarding.

#ANDROID NDK SOCKET SOFTWARE#

It can be guessed that these commercial-grade software adopt dual-process daemon Method.

If you observe from the process manager, you will find that Sina Weibo, Alipay, and QQ have more than two related processes, one of which is the daemon process.