go连接打印机出现乱码的问题修改

最近在做go打印机票的。找了好几天的资料。终于实现了。在这里大概说下我的思路

1.使用第三方插件。连接打印机

2.接收到的字符要转成gbk

1.打印机使用的是 打印机地址 （github.com/alexbrainman/printer）

2.utf8转gbk使用谷歌自带的转换。直接贴代码如下

import (
	"sync"
	"fmt"
	"net/http"
	"io/ioutil"
	"strings"
	"crypto/md5"
	//"io"
	"encoding/hex"
	"encoding/json"
	"bytes"

	prt "github.com/alexbrainman/printer"

	"github.com/json-iterator/go" //第三方库
	"golang.org/x/text/transform"
	"golang.org/x/text/encoding/simplifiedchinese"
)
type myPrint struct{
	p *prt.Printer

}
// transform GBK bytes to UTF-8 bytes
func (p1 *myPrint) GbkToUtf8(str []byte) (b []byte, err error) {
    r := transform.NewReader(bytes.NewReader(str), simplifiedchinese.GBK.NewDecoder())
    b, err = ioutil.ReadAll(r)
    if err != nil {
        return
    }
    return
}

// transform UTF-8 bytes to GBK bytes
func (p1 *myPrint) Utf8ToGbk(str []byte) (b []byte, err error) {
    r := transform.NewReader(bytes.NewReader(str), simplifiedchinese.GBK.NewEncoder())
    b, err = ioutil.ReadAll(r)
    if err != nil {
        return
    }
    return
}

// transform GBK string to UTF-8 string and replace it, if transformed success, returned nil error, or died by error message
func (p1 *myPrint) StrToUtf8(str *string) error {
    b, err := p1.GbkToUtf8([]byte(*str))
    if err != nil {
		fmt.Println(err)
        return err
    }
    *str = string(b)
    return  nil
}

// transform UTF-8 string to GBK string and replace it, if transformed success, returned nil error, or died by error message
func (p1 *myPrint) StrToGBK(str string) string {
    b, err := p1.Utf8ToGbk([]byte(str))
    if err != nil {
		fmt.Println(err)
        return ""
    }
    str = string(b)
    return  str
}