英文:
Getting file content into a multidimensional string var
问题
我正在使用fsnotify包来等待json文件的更改。
我在这段代码中遇到了两个问题。第一个问题是关于ReadFile函数返回的信息。当我打印函数返回的内容时，似乎是空的。
第二个问题是关于fsnotify在第一次读取文件时不起作用，除非我对内容进行一些修改。我也必须从开头读取文件。
type Information struct {
Info []Info `json:"info"`
}
type Info struct {
Type string `json:"type"`
News []New `json:"news"`
}
type New struct {
Name string `json:"name"`
Read bool `json:"read"`
}
func ReadFile(file_name string) *Information {
jsonFile, err := os.Open(file_name)
if err != nil {
fmt.Println(err)
}
fmt.Println("Successfully Opened file_name.json")
defer jsonFile.Close()
byteValue, _ := ioutil.ReadAll(jsonFile)
var infor Information
json.Unmarshal(byteValue, &infor)
return &infor
}
// 主函数
func main() {
// 使用fsnotify读取json文件并等待更改
watcher, err := fsnotify.NewWatcher()
if err != nil {
panic(err)
}
err = watcher.Add(file_json)
if err != nil {
panic(err)
}
for {
select {
case ev, ok := <-watcher.Events:
log.Println("event:", ev)
if !ok {
return
}
if ev.Op&fsnotify.Write == fsnotify.Write {
data := ReadFile(file_name)
fmt.Print("文件信息：\n")
for _, info := range data.Info {
fmt.Printf("信息类型：%s\n", info.Type) // 这里没有打印info.Type的结果
for _, news := range info.News {
fmt.Printf("新闻名称：%s\n", news.Name) // 这里甚至没有打印"新闻名称："或"新闻已读："
fmt.Printf("新闻已读：%s\n", strconv.FormatBool(news.Read))
}
}
}
case err := <-watcher.Errors:
log.Println("错误：", err)
}
}
}
这是json文件的内容：
{
"info": [
{
"type": "general",
"news": [
{ "name": "abc", "read": true },
{ "name": "def", "read": true }
]
},
{
"type": "confidential",
"news": [
{ "name": "xxx", "read": false },
{ "name": "yyy", "read": false }
]
}
]
}
英文:
I'm using the fsnotify packet to wait for changes in a json file.
I have two problems with this code. The first one is regarding the info returned by ReadFile function. Looks like when I print something returned by the function is empty.
Second issue is regarding the fsnotify that is not reading the file the first time unless i do some modification on the content. I must read the file from the beggining as well.
type Information struct {
Info []Info `json:"info"`
}
type Info struct {
Type string `json:"type"`
News []New `json:"news"`
}
type New struct {
Name string `json:"name"`
Read bool `json:"read"`
}
func ReadFile(file_name string) *Information {
jsonFile, err := os.Open(file_name)
if err != nil {
fmt.Println(err)
}
fmt.Println("Successfully Opened file_name.json")
defer jsonFile.Close()
byteValue, _ := ioutil.ReadAll(jsonFile)
var infor Information
json.Unmarshal(byteValue, &infor)
return &infor
}
// main function
func main() {
// read json file using fsnotify to wait for changes
watcher, err := fsnotify.NewWatcher()
if err != nil {
panic(err)
}
err = watcher.Add(file_json)
if err != nil {
panic(err)
}
for {
select {
case ev, ok := <-watcher.Events:
log.Println("event:", ev)
if !ok {
return
}
if ev.Op&fsnotify.Write == fsnotify.Write {
data := ReadFile(file_name)
fmt.Print("INFORMATION ABOUT FILE:\n")
for _, info := range data.Info {
fmt.Printf("Info type: %s\n", info.Type) // Here is not printing the result of info.Type
for _, news := range info.News {
fmt.Printf("News Name: %s\n", news.Name) // Here is not printing even "News Name:" or News Read:"
fmt.Printf("News Read: %s\n", strconv.FormatBool(news.Read))
}
}
}
case err := <-watcher.Errors:
log.Println("error:", err)
}
}
}
This is the json file:
{
    "info": [
      {
        "type": "general",
        "news": [
          { "name": "abc",  "read": true },
          { "name": "def",  "read": true }
        ]
      },
{
"type": "confidential",
"news": [
{ "name": "xxx", "read": false },
{ "name": "yyy", "read": false }
]
},
]
}
答案1
得分: 1
type Information struct {
Info []Info `json:"info"`
}
type Info struct {
Type string `json:"type"`
News []New `json:"news"` // 这里应该是一个切片定义。
}
type New struct {
Name string `json:"name"`
Read bool `json:"read"`
}
func ReadFile(file_name string) *Information {
jsonFile, err := os.Open(file_name)
if err != nil {
fmt.Println(err)
}
fmt.Println("成功打开文件 file_name.json")
defer jsonFile.Close()
byteValue, _ := ioutil.ReadAll(jsonFile)
var infor Information
json.Unmarshal(byteValue, &infor)
return &infor
}
func main() {
data := ReadFile("./data.json")
for _, news := range data.Info {
for _, v := range news.News {
name := v.Name
// 添加你想要做的操作
fmt.Println(name)
}
}
}
你不能得到这样的结果：
getInfo = [general][abc, true, def, true]
[confidential][xxx, false, yyy, false]
英文:
type Information struct {
Info []Info `json:"info"`
}
type Info struct {
Type string `json:"type"`
News []New `json:"news"` // Here should be a slice define.
}
type New struct {
Name string `json:"name"`
Read bool `json:"read"`
}
func ReadFile(file_name string) *Information {
jsonFile, err := os.Open(file_name)
if err != nil {
fmt.Println(err)
}
fmt.Println("Successfully Opened file_name.json")
defer jsonFile.Close()
byteValue, _ := ioutil.ReadAll(jsonFile)
var infor Information
json.Unmarshal(byteValue, &infor)
return &infor
}
func main() {
data := ReadFile("./data.json")
for _, news := range data.Info {
for _, v := range news.News {
name := v.Name
// Add you want to do
fmt.Println(name)
}
}
}
You can not get like this:
getInfo = [general][abc, true, def, true]
[confidential][xxx, false, yyy, false]
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