Go语言TCP Socket编程：解决数据读取EOF错误与缓冲区管理

package main

import (
    "fmt"
    "net"
    "os"
)

func listenWithError(server string) {
    var buf []byte // 错误：未初始化的零长度切片，长度为0

    listener, err := net.Listen("tcp", server)
    if err != nil {
        fmt.Fprintf(os.Stderr, "Could not listen on socket: %s\n", err.Error())
        return
    }
    defer listener.Close() // 确保监听器关闭

    conn, err := listener.Accept()
    if err != nil {
        fmt.Fprintf(os.Stderr, "Could not accept connection on socket: %s\n", err.Error())
        return
    }
    defer conn.Close() // 确保连接关闭

    fmt.Println("Wrote 17 bytes to socket") // 模拟发送消息

    // 尝试读取数据
    readlen, err := conn.Read(buf) // 此处会立即返回EOF或0字节
    if err != nil {
        fmt.Fprintf(os.Stderr, "Error when reading from socket: %s\n", err.Error())
        return
    }
    if readlen == 0 {
        fmt.Printf("Connection closed by remote host or no data read.\n")
        return
    }
    // 注意：由于buf长度为0，即使Read成功，string(buf[:readlen])也无法正确显示数据
    fmt.Printf("Read %d bytes: %s\n", readlen, string(buf[:readlen]))
}

// main函数仅为示例，实际运行时请使用完整Echo服务器示例中的main
func main() {
    // 假设在端口1234上监听
    listenWithError(":1234")
}