Programmer Think

0.TF initial experience http://wiki.ros.org/tf/Tutorials/Introduction%20to%20tf 1.Writing a tf broadcaster (C++) In the next two tutorials, we will write code to reproduce the demonstration in the tf introductory tutorial. After that, the following tutorial will focus on extending the demo with more ...

What I bring to you today is mastering FPGA VHDL Day 6 in a week. Today, I open the sixth day to bring VHDL simulation. Let's stop talking nonsense. Let's have a look. Ten minutes a day. Keep going. Quantity becomes quality.           VHDL language         6, VHDL simulation Simulation (a ...

Network communication simulator using WINSOCK (client side) Recently, in the process of embedded project, I learned winsock network programming. The main content of project is to simulate the whole process through c language before migrating to stm32. The process includes: a client device and a sens ...

1. Introduction There is a timer requirement for the project, as shown in the figure below. It was supposed to be quite simple, but it actually involves the time zone. The renderings are as follows 2. Solution The key code is relatively simple Milliseconds to HH:ss:mm Refresh and change the time on the control regularly The ...

When opening a web page, the system browser will not be called, but will be displayed in this WebView: mWebView.setWebViewClient(new WebViewClient(){ @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); return true; } }); Calling JavaScript ...

It is mainly to record the pit encountered by the single-chip microcomputer of Reza. Although Reza has been used before, it will be forgotten after a long time. It is convenient to record it for later use Introduction to re5f10368 Hardware introduction Burner link Part of procedure Configuration pa ...

Explain TouchId fingerprint recognition, FaceId face unlocking, collectively referred to as biometrics. Realization Introduce the Local Authentication Framework. If it's iOS 13, it's available by default. You don't need to re introduce it. import LocalAuthentication Check that biometrics are avail ...

There are so many card pullers playing. I have come to write a card puller simulator. There are six card classes: s s s, ss, s, a, b, c. the probability of sss is 0.01%, ss probability is 0.1%, s probability is 1%, a probability is 15%, b probability is 30%, and the rest is c. in order to avoid staying in Africa for a long time ...

Blockchain tutorial's Fabric1.0 source code analysis Ledger II. Ledger of Fabric 1.0 source code Notes Supplement the definition of commonledger.Ledger interface embedded in PeerLedger interface as follows: type Ledger interface {     GetBlockchainInfo() (*common.BlockchainInfo, error) //Get the basic information of blockchain     GetBlockByNum ...

8. Explicit animation Explicit animation If you want things to go smoothly, you have to rely on yourself The previous chapter introduced the concept of implicit animation. Implicit animation is a direct way to create dynamic user interface on iOS platform, and it is also the basis of UIKit animation mechanism, but it can not cover all types ...