在建立好TCPSocket之后，如何将复合类型结构转换为ArrayBuffer？

 strToArrayBuffer(str: string) { 
        let buf = new ArrayBuffer(str.length * 2); 
        let bufView = new Uint16Array(buf); 
        for (let i = 0, strLen = str.length; i < strLen; i++) { 
          bufView[i] = str.charCodeAt(i); 
        } 
        return buf; 
      }

let objData = new testObj("123.45.6.78","8086",new message("str","send data")); 
console.info(`string : ${JSON.stringify(objData)}`) 
let buf1 = this.strToArrayBuffer(JSON.stringify(objData));