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How to build the windows ethernet private chain development environment? in view of this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

Install DApp development environment 1.1 install Node.js

We use the official long-supported version of 8.10.0LTS, click this link to download the 32-bit installation package, which can be used on both 32-bit and 64-bit systems. If you confirm that your system is 64-bit, you can also download 64-bit packages. Download and install it directly. After installation, open a console window and you can use node:

C:\ Users\ hubwiz > node-vv8.10.01.2 install Geth

Download the 64-bit or 32-bit Geth installer and install it. After the installation is complete, open a console and execute the command to verify that the installation is successful:

C:\ Users\ hubwiz > geth versionGethVersion: 1.8.3-stable1.3 installs the solidity compiler

Solidity is the programming language for the development of ethernet intelligent contract. If you are not familiar with it, you can check out the brief introduction of ethernet square solitary development language.

C:\ Users\ hubwiz > npm install-g solc

After the installation is complete, execute the command to verify that the installation is successful

C:\ Users\ hubwiz > solcjs-version0.40.2+commit.3155dd80.Emscripten.clang1.4 install web3

Git is used in the Web3 installation process, so you need to install the windows version of the git command line first. Download the 64-bit or 32-bit git installer and continue to install web3 after local installation.

C:\ Users\ hubwiz > npm install-g web3@0.20.2

Installation verification:

C:\ Users\ hubwiz > node-p 'require ("web3")' {[Function: Web3] providers: {… }} 1.5 install the truffle framework

Execute the following command to install the truffle development framework:

C:\ Users\ hubwiz > npm install-g truffle

Verify the installation:

C:\ Users\ hubwiz > truffle.cmd versionTruffle v4.1.3 (core 4.1.3) 1.6 install webpack

Execute the following command to install webpack:

C:\ Users\ hubwiz > npm install-g webpack@3.11.0

Verify installation

C:\ Users\ hubwiz > webpack-v3.11.02, run Private chain Node 2.1 Genesis Block configuration

Create a node directory, node1, and create a private chained Genesis block profile in it:

C:\ Users\ hubwiz > mkdir node1C:\ Users\ hubwiz > cd node1C:\ Users\ hubwiz\ node1 > notepad private.json

Then edit the content as follows:

{"config": {"chainId": 7878, "homesteadBlock": 0, "eip155Block": 0, "eip158Block": 0}, "difficulty": "200"," gasLimit ":" 2100000 "," alloc ": {" 7df9a875a174b3bc565e6424a0050ebc1b2d1d82 ": {" balance ":" 300000 "}," f41c74c9ae680c1aa78f42e5647a62f353b7bdde ": {" balance ":" 400000 "}

Config.chainId is used to declare the ethernet network number. Choose a number greater than 10.

Difficulty is used to declare the difficulty of mining. The smaller the value, the lower the difficulty, and the faster the block can be produced.

2.2 initialize private chain nodes

Execute the init command of geth to initialize the private chain node:

C:\ Users\ hubwiz\ node1 > geth-- datadir.\ data init private.json

This creates a data directory under the current directory to store block data and account information:

C:\ Users\ hubwiz\ node1 > dirdata private.json

You can write the above command into a script init.cmd to avoid typing so many things you can't remember every time. The contents of the document are as follows:

Geth-datadir.\ data init private.json

When you deploy the next node, you can execute this script directly for initialization. For example, on another machine:

C:\ Users\ hubwiz\ node1 > init.cmd2.3 starts the private chain node

Boot from the specified private chain data directory and set a different network number to start the node:

C:\ Users\ hubwiz\ node1 > geth-rpc-datadir.\ data-networkid 7878 console

Similarly, you can use a script console.cmd to simplify the input when starting the node, as follows:

Geth-- rpc\-- rpcaddr 0.0.0.0\-- rpccorsdomain "*"\-datadir. / data\-- networkid 7878\ console

The rpcaddr parameter is used to declare the listening address of the node RPC API. If it is set to 0.0.0.0, the API can be accessed from other machines.

The rpccorsdomain parameter is designed to address the security restrictions on cross-domain calls of web3 from browsers. To start the node later, just execute the script directly:

C:\ Users\ hubwiz\ node1 > console.cmd2.4 account Management 2.4.1 View account list

In the geth console, use the accounts property of the eth object to view the current account list:

> eth.accounts []

Because we haven't created an account yet, the list is still empty.

2.4.2 create a new account

In the geth console, use the newAccount () method of the personal object to create a new account with a password of your choice:

> personal.newAccount ('7878787878') 0xd8bcf1324d566cbec5d3b67e6e14485b06a41d49

The output is the newly created account address (public key), and your output will not be the same as the example above. The geth is saved to the keystore file in the data directory. The password should be memorized by yourself and need to be used in the future.

2.4.3 query account balance

In the geth console, use the getBalance () method of the personal object to obtain the balance of the specified account. The parameter is the account address:

> eth.getBalance (eth.accounts [0]) 0

Or enter the account address directly:

> eth.getBalance ('0xd8bcf1324d566cbec5d3b67e6e14485b06a41d49') 0

Sure enough, the balance of the newly created account is 0.

2.4.4 Mining

Accounts without money can do nothing and need to dig mines to make some money. Execute the start () method of the miner object in the geth console to start mining:

> miner.start (1)

After a few minutes, check the account balance:

> eth.getBalance (eth.accounts [0]) 2.695e+21

There is a lot of money, 2695ETH. At present, the market capitalization is nearly 5 million RMB, ha. Execute the stop () method of the miner object to stop mining:

> miner.stop () 2.4.5 unlock the account

An unlocked account is required when deploying the contract. In the geth console, use the unlockAccount () method of the personal object to unlock the specified account, with the parameters of the account address and account password (the password specified when the account was created):

> eth.unlockAccount (eth.accounts [0], '78787878') true III. Build sample project 3.1 New DApp project

Execute the following command to create a project directory and enter it:

C:\ Users\ hubwiz > mkdir demoC:\ Users\ hubwiz > cd demo

Then initialize the project skeleton structure with the webpack template:

C:\ Users\ hubwiz\ demo > truffle.cmd unbox webpackDownloading... Unpacking... Setting up... Unbox successful. Sweet 3.2 install the NPM package that the project depends on

Execute the following command to install the nmp package:

C:\ Users\ hubwiz\ demo$ npm install3.3 modify truffle configuration

If you use a graphical version of ganache, you do not need to modify the truffle.js configuration file. Otherwise, you need to change the port to 8545 in truffle.js, because ganache-cli listens on port 8545:

Module.exports = {networks: {development: {port: 8545} 3.4 launch node

Execute the following command to start the node emulator to deploy the contract and execute the transaction:

C:\ Users\ hubwiz\ node1 > console.cmd

Note: in order to deploy the contract on the node, don't forget to unlock the account after starting geth:

> personal.unlockAcount (eth.accounts [0], '78787878') true3.5 compilation contract

Execute the following command to compile the project contract:

C:\ Users\ hubwiz\ demo > truffle.cmd compile3.6 deployment contract

Execute the following command to deploy the contract:

C:\ Users\ hubwiz\ demo > truffle.cmd migrate

If you forgot to unlock your account in the geth console, you will see the following error. You can unlock it by referring to the previous instructions:

Error: authentication needed: password or unlock

If you have unlocked the account correctly, you will see that the deployment process stops in the following state:

Replacing Migrations... 0x3088762a5bc9...

This is because truffle is waiting for the deployment deal to be submitted, but we haven't started mining in the private chain yet. Now switch back to the geth terminal window to view the status of the transaction pool:

> txpool.status {pending:1, queued:0}

Sure enough, there is a pending deal! Just start digging:

> miner.start (1)

Wait a moment, and then check the status of the trading pool:

> txpool.status {pending:0, queued:0}

The deal has been successfully submitted. We can stop digging because it takes up too much CPU:

> miner.stop ()

Now switch back to the truffle terminal, and the deployment process is completed correctly.

3.7 start DApp

Execute the following command to start DApp:

C:\ Users\ hubwiz\ demo > npm run dev

You can access http://localhost:8080 in your browser.

If you want to be able to access your DApp application from another machine, modify package.json:

{scripts: {"dev": "webpack-dev-server-- host 0.0.0.0"}} the answer to the question on how to build the private chain development environment of windows ethernet is shared here. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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