【问题】
折腾:
期间,用如下代码:
var logFilename string = filenameOnly + ".log"; //logfile,err: = os.OpenFile("/Users/cybercare/tmp/test.log",os.O_RDWR|os.O_CREATE,0666) logFile, err: = os.OpenFile(logFilename, os.O_RDWR|os.O_CREATE, 0777) if err!=nil{ fmt.Printf("open file error=%s\r\n",err.Error()) os.Exit(-1) } defer logFile.Close() logger:=log.New(logFile,"\r\n", log.Ldate | log.Ltime | log.Llongfile) logger.Println("hello") logger.Println("oh....") logger.Fatal("test") logger.Fatal("test2")
结果出错:
D:\tmp\tmp_dev_root\go\src\github.com\user\EmulateLoginBaidu>go run EmulateLoginBaidu.go # command-line-arguments .\EmulateLoginBaidu.go:55: syntax error: unexpected :, expecting := or = or comma
如图:
即:
syntax error: unexpected :, expecting := or = or comma |
【解决过程】
1.去把import中的os加上,改为:
package main import ( "fmt" //"log" "os" //"io/ioutil" //"net/http" "runtime" "path" "strings" ) // GetCurFilename // Get current file name, without suffix func GetCurFilename() string { // var currentDir string // currentDir, err := os.Getwd() // fmt.Println("currentDir=%s", currentDir) // if err != nil { // fmt.Println("get current directory error=%s\n", err) // } _, fulleFilename, _, _ := runtime.Caller(0) //fmt.Println(fulleFilename) var filenameWithSuffix string filenameWithSuffix = path.Base(fulleFilename) //fmt.Println("filenameWithSuffix=", filenameWithSuffix) var fileSuffix string fileSuffix = path.Ext(filenameWithSuffix) //fmt.Println("fileSuffix=", fileSuffix) //filenameWithSuffix = "EmulateLoginBaidu" //fileSuffix = ".go" //filenameWithSuffix = "EmulateLoginBaidu.go.go.go" //fileSuffix = ".go" //filenameWithSuffix = "EmulateLoginBaidu.go.txt" //fileSuffix = ".go" var filenameOnly string filenameOnly = strings.TrimSuffix(filenameWithSuffix, fileSuffix) //fmt.Println("filenameOnly=", filenameOnly) return filenameOnly } func main() { fmt.Printf("this is EmulateLoginBaidu.go\n") var filenameOnly string filenameOnly = GetCurFilename() fmt.Println("filenameOnly=", filenameOnly) var logFilename string = filenameOnly + ".log"; //logfile,err: = os.OpenFile("/Users/cybercare/tmp/test.log",os.O_RDWR|os.O_CREATE,0666) logFile, err: = os.OpenFile(logFilename, os.O_RDWR | os.O_CREATE, 0777) if err!=nil{ fmt.Printf("open file error=%s\r\n",err.Error()) os.Exit(-1) } defer logFile.Close() logger:=log.New(logFile,"\r\n", log.Ldate | log.Ltime | log.Llongfile) logger.Println("hello") logger.Println("oh....") logger.Fatal("test") logger.Fatal("test2") //var baiduMainUrl string //baiduMainUrl = "http://www.baidu.com/"; //baiduMainUrl := "http://www.baidu.com/"; // var baiduMainUrl string = "http://www.baidu.com/"; // fmt.Printf("baiduMainUrl=%s\n", baiduMainUrl) // resp, err := http.Get(baiduMainUrl) // if err != nil { // fmt.Printf("http get response errror=%s\n", err) // } // defer resp.Body.Close() // body, err := ioutil.ReadAll(resp.Body) // fmt.Printf("body=%s\n", body) }
结果:
错误依旧。
2.再改为:
//logFile, err: = os.OpenFile(logFilename, os.O_RDWR | os.O_CREATE, 0777) logFile, err: = os.OpenFile(logFilename, os.O_RDWR | os.O_CREATE, 0777);
结果错误依旧。
3.参考:
In an import clause: "syntax error: unexpected :, expecting := or = or comma" — wot?
结果也是没有太大帮助。
4.此处,经过自己认真看代码,发现错误了:
自己不小心,把
:=
写成了
: =
即,冒号和等号之间,多了个空格。
所以出现语法错误,改为:
//logfile,err: = os.OpenFile("/Users/cybercare/tmp/test.log",os.O_RDWR|os.O_CREATE,0666) //logFile, err: = os.OpenFile(logFilename, os.O_RDWR | os.O_CREATE, 0777) //logFile, err: = os.OpenFile(logFilename, os.O_RDWR | os.O_CREATE, 0777); logFile, err := os.OpenFile(logFilename, os.O_RDWR | os.O_CREATE, 0777)
即可。
【总结】
此处,go代码:
logFile, err: = os.OpenFile(logFilename, os.O_RDWR | os.O_CREATE, 0777)
出现:
syntax error: unexpected :, expecting := or = or comma |
的错误,原因是:
自己的笔误,在给原先参考别人的代码,没有空格,而自己手动去加空格的时候,不小心把:
冒号等于号
弄成了:
冒号空格等于号
所以出错了。
改为正确的:
:=
即可。
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