node child_process stdio extra fd test in windows

[In progress] 父子进程通信，node python进程通信，测试代码

father.js

 1 const spawn = require('child_process').spawn;
 2 const ipcOutgoingFd = 3;
 3 const ipcIncomingFd = 4;
 4 let stdio = ['ignore', 'pipe', process.stderr, 'pipe', 'pipe'];
 5     
 6 //const proc = spawn('python child.py', [], { stdio, shell: true });
 7 const proc = spawn('node', ['child.js'], { stdio, shell: true });
 8  // record its sent/received commands on exit
 9 
10  proc.on('exit', (code) => {
11      if (code == 0) {   
12          let str = proc.stdout.read().toString();       
13          if(str.search("\r\n")!=-1){
14              sentCommands = str.split("\r\n");
15          }
16          else{ 
17              sentCommands = str.split('\n');
18          }
19          console.log(sentCommands);
20          console.log("OK");
21      }
22  });
23 
24  // create IPC interface
25  let outgoingStream = proc.stdio[ipcOutgoingFd];
26  let incomingStream = proc.stdio[ipcIncomingFd];
27 
28  // Command #1: ok
29  outgoingStream.write(12);
30 
31  // Command #2: ok
32  

child.js

 1 const ipcOutgoingFd = 4;
 2 var ipcIncomingFd = 3;
 3 const fs = require('fs');
 4 
 5 
 6 var bufferSize=256  ,
 7     chunkSize=128,
 8     buffer= Buffer.alloc(bufferSize),
 9     bytesRead = 0;
10 fs.read(ipcIncomingFd, buffer, bytesRead, chunkSize, bytesRead, testCallback);
11 /* while (bytesRead < bufferSize) {
12     if ((bytesRead + chunkSize) > bufferSize) {
13         chunkSize = (bufferSize - bytesRead);
14     }
15 
16     fs.read(ipcIncomingFd, buffer, bytesRead, chunkSize, bytesRead, testCallback);
17     bytesRead += chunkSize;
18 } */
19 console.log("receive");
20 console.log(buffer.toString('utf8'));
21 
22 var testCallback = function(err, bytesRead, buffer){
23     console.log('err : ' +  err);
24 };

child.py

 1 _in_file = open(3, 'rb')
 2 _out_file = open(4, 'wb')
 3 
 4 def send(command, data):
 5     command = command.encode('utf8')
 6     data = data.encode('utf8')
 7     msg = b'%b%06d%b' % (command, len(data), data)
 8     _out_file.write(msg)
 9     _out_file.flush()
10 
11 
12 def receive():
13     header = _in_file.read(1024)
14     data = header.decode('utf8')
15     return data
16 
17 
18 print(receive())
19 
20 send('KI', '')
21 
22 print(receive())
23 
24 send('KI', 'hello')
25 
26 send('KI', '世界')