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写得不完善也不完美 尤其是高低位转换那（go和c 二进制高地位相反 需要转换，还有go int转[]byte长度是4位），希望牛人看后指导一下
项目需要通过socket调取 客户端是go ，服务器端是python，由于需要封包解包，就参照python写的
python 的pack/unpack 参考 Python使用struct处理二进制(pack和unpack用法)
package includes import ( "bytes" "encoding/binary" "fmt" _ "os" "strconv" "strings" ) type Protocol struct { Format []string } //封包 func (p *Protocol) Pack(args ...interface{}) []byte { la := len(args) ls := len(p.Format) ret := []byte{} if ls > 0 && la > 0 && ls == la { for i := 0; i < ls; i++ { if p.Format[i] == "H" { ret = append(ret, IntToBytes2(args[i].(int))...) } else if p.Format[i] == "I" { ret = append(ret, IntToBytes4(args[i].(int))...) } else if strings.Contains(p.Format[i], "s") { num, _ := strconv.Atoi(strings.TrimRight(p.Format[i], "s")) ret = append(ret, []byte(fmt.Sprintf("%s%s", args[i].(string), strings.Repeat("\x00", num-len(args[i].(string)))))...) } } } return ret } //解包 func (p *Protocol) UnPack(msg []byte) []interface{} { la := len(p.Format) ret := make([]interface{}, la) if la > 0 { for i := 0; i < la; i++ { if p.Format[i] == "H" { ret[i] = Bytes4ToInt(msg[0:2]) msg = msg[2:len(msg)] } else if p.Format[i] == "I" { ret[i] = Bytes4ToInt(msg[0:4]) msg = msg[4:len(msg)] } else if strings.Contains(p.Format[i], "s") { num, _ := strconv.Atoi(strings.TrimRight(p.Format[i], "s")) ret[i] = string(msg[0:num]) msg = msg[num:len(msg)] } } } return ret } func (p *Protocol) Size() int { size := 0 ls := len(p.Format) if ls > 0 { for i := 0; i < ls; i++ { if p.Format[i] == "H" { size = size + 2 } else if p.Format[i] == "I" { size = size + 4 } else if strings.Contains(p.Format[i], "s") { num, _ := strconv.Atoi(strings.TrimRight(p.Format[i], "s")) size = size + num } } } return size } //整形转换成字节 func IntToBytes(n int) []byte { m := int32(n) bytesBuffer := bytes.NewBuffer([]byte{}) binary.Write(bytesBuffer, binary.BigEndian, m) gbyte := bytesBuffer.Bytes() return gbyte } //整形转换成字节4位 func IntToBytes4(n int) []byte { m := int32(n) bytesBuffer := bytes.NewBuffer([]byte{}) binary.Write(bytesBuffer, binary.BigEndian, m) gbyte := bytesBuffer.Bytes() //c++ 高低位转换 k := 4 x := len(gbyte) nb := make([]byte, k) for i := 0; i < k; i++ { nb[i] = gbyte[x-i-1] } return nb } //整形转换成字节2位 func IntToBytes2(n int) []byte { m := int32(n) bytesBuffer := bytes.NewBuffer([]byte{}) binary.Write(bytesBuffer, binary.BigEndian, m) gbyte := bytesBuffer.Bytes() //c++ 高低位转换 k := 2 x := len(gbyte) nb := make([]byte, k) for i := 0; i < k; i++ { nb[i] = gbyte[x-i-1] } return nb } //字节转换成整形 func BytesToInt(b []byte) int { bytesBuffer := bytes.NewBuffer(b) var x int32 binary.Read(bytesBuffer, binary.BigEndian, &x) return int(x) } //4个字节转换成整形 func Bytes4ToInt(b []byte) int { xx := make([]byte, 4) if len(b) == 2 { xx = []byte{b[0], b[1], 0, 0} } else { xx = b } m := len(xx) nb := make([]byte, 4) for i := 0; i < 4; i++ { nb[i] = xx[m-i-1] } bytesBuffer := bytes.NewBuffer(nb) var x int32 binary.Read(bytesBuffer, binary.BigEndian, &x) return int(x) }
调用
p := new(Protocol) p.Format = []string{"H", "H", "I", "16s", "I", "I", "I"} h_byte := p.Pack(1, 1, 1, "abc", 1, 0, len(request_buf)) conn.Write(h_byte)
附加：
int 转 二进制 fmt.Printf("%08b\n", 97) // 01100001 二进制转int i, _ := strconv.ParseInt("1100001", 2, 32) //97 int 转 []byte IntToBytes(1000) // [0 0 3 232] 3*256+232=1000 func IntToBytes(n int) []byte { m := int32(n) bytesBuffer := bytes.NewBuffer([]byte{}) binary.Write(bytesBuffer, binary.BigEndian, m) gbyte := bytesBuffer.Bytes() return gbyte } []byte 转int BytesToInt([]byte{0,0,3,232}) //1000 func BytesToInt(b []byte) int { bytesBuffer := bytes.NewBuffer(b) var x int32 binary.Read(bytesBuffer, binary.BigEndian, &x) return int(x) } int 转 byte byte(97) //97
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原文地址：http://www.cnblogs.com/wangxusummer/p/4397529.html
