一 这里命令行参数解析使用的是第三方包 go-flags
github地址 https://github.com/jessevdk/go-flags
在README.md文件中，有部分关于bool类型的说明
var opts struct {
// Slice of bool will append 'true' each time the option
// is encountered (can be set multiple times, like -vvv)
Verbose []bool `short:"v" long:"verbose" description:"Show verbose debug information"`
}This specifies one option with a short name -v and a long name –verbose. When either -v or –verbose is found on the command line, a ‘true’ value will be appended to the Verbose field. e.g. when specifying -vvv, the resulting value of Verbose will be {[true, true, true]}.
【只要在命令行中找到 -v 或–verbose，那么，参数对应的值就是 true】
【如果需要设置false，则 去掉 -v 或–verbose 就好】
// Make some fake arguments to parse.
args := []string{
"-vv",
}
fmt.Printf("Verbosity: %vn", opts.Verbose)
// Output: Verbosity: [true true]二 在 vscode中的具体使用
-
launch.json 中设置
"configurations": [ { "name": "lobby_server", "type": "go", "request": "launch", "mode": "auto", "program": "${workspaceFolder}/cmd/lobby_server", "args": [ "--debug",//bool flag只要设置 short或long,值就是true "--lobby_config_file","lobby_8101.toml", ] },
main.go 文件
import(
"github.com/jessevdk/go-flags"
)
// 命令行参数
type CmdParams struct {
Debug bool `short:"d" long:"debug" description:"是否debug"`
Lobby_config_file string `short:"l" long:"lobby_config_file" description:"大厅配置文件"`
}
func main() {
defer func() {
if err := recover(); err != nil {
fmt.Println(err)
}
}()
//解析参数
var cmd_params CmdParams
if _, err := flags.Parse(&cmd_params); err != nil {
panic("Parse err:" + err.Error())
}
if !cmd_params.Debug {
xdebug.Set_release()
}
//...
}三 调试跟踪代码
具体可详细查看 函数 parseOption
func (p *Parser) parseOption(s *parseState, name string, option *Option, canarg bool, argument *string) (err error) {
if !option.canArgument() {//bool类型 不能带参数
if argument != nil {
return newErrorf(ErrNoArgumentForBool, "bool flag `%s' cannot have an argument", option)
}
err = option.set(nil)
} else if argument != nil || (canarg && !s.eof()) {
//...
}
//....
}
func (option *Option) canArgument() bool {
if u := option.isUnmarshaler(); u != nil {
return true
}
return !option.isBool()
}
//运行参数是否是bool类型
func (option *Option) isBool() bool {
tp := option.value.Type()
for {
switch tp.Kind() {
case reflect.Slice, reflect.Ptr:
tp = tp.Elem()
case reflect.Bool:
return true
case reflect.Func:
return tp.NumIn() == 0
default:
return false
}
}
}–the end
