strings方法

func test12(){
    var str string = "学习，就是知已不足，寻找改变的方法，尝试尝试再尝试，并以此为乐...这就是学习"
    fmt.Printf("The position of \"方法\" is: ")
    fmt.Printf("%d\n", strings.Index(str, "方法"))
    fmt.Printf("The position of the first instance of \"学习\" is: ")
    fmt.Printf("%d\n", strings.Index(str, "学习"))
    fmt.Printf("The position of the last instance of \"学习\" is: ")
    fmt.Printf("%d\n", strings.LastIndex(str, "学习"))
    fmt.Printf("The position of \"哪怕改变再小\" is: ")
    fmt.Printf("%d\n", strings.Index(str, "哪怕改变再小"))
}

The position of "方法" is: 45
The position of the first instance of "学习" is: 0
The position of the last instance of "学习" is: 105
The position of "哪怕改变再小" is: -1

/**
func (this *Server) socketParserHandler(client *genTcpServer.Client, fullData []byte) {

    fmt.Println("original data is", client)
    strPointerHex := fmt.Sprintf("%p", unsafe.Pointer(client))
    fmt.Println("connection is", strPointerHex)

    strPointerInt := fmt.Sprintf("%d", unsafe.Pointer(client))
    fmt.Println("connection is", strPointerInt)

    i, _ := strconv.ParseInt(strPointerInt, 10, 0)

    var pointer *genTcpServer.Client
    pointer = *(**genTcpServer.Client)(unsafe.Pointer(&i))
    fmt.Println("connection pointer is", pointer)

    debugMsg := fmt.Sprintf("%p", unsafe.Pointer(pointer))
    fmt.Println("debugMsg is", debugMsg)
 */
func unsafeTest()  {
    ss := "工工在aaa"
    s1 := []byte(ss)
    a := unsafe.Pointer(&s1) //0xc0000a6ee0  取针指指向的地址，不限定类型
    fmt.Println(a)

    bb := (*string)(a)       //0xc0000a6ee0  取字节数组的开始地址，确定地址存储的类型是字符串
    b := fmt.Sprintf("%v",bb)
    fmt.Println(b)
    s2 := *bb
    fmt.Println(s2)  //工工在aaa


}


func testByte()  {
    ss := "工工在aaa"
    s1 := []byte(ss)
    mm := fmt.Sprintf("%v",s1)
    fmt.Println(mm)

    ss = ByteArrayToStr(mm)
    fmt.Println(ss)
}

//字符串转字节数据-->fmt.Sprintf("%v",s1) 格式化为字符串后-->转回原来的字符串
func ByteArrayToStr(byteStr string)  string{
    byteStr = strings.TrimLeft(byteStr,"[")
    byteStr = strings.TrimRight(byteStr,"]")
    b := strings.Split(byteStr," ")
    var bn  = make([]byte,0)
    for _,v := range b {
        i,_ := strconv.Atoi(v)
        c := byte(i)
        bn = append(bn,c)
    }
    return string(bn)
}