How to parse command line parameters in Go language?

Go language is an open source programming language that is efficient, concise, and easy to read. As a system-level programming language, Go language has a wide range of application scenarios, including network programming, cloud computing, artificial intelligence, blockchain and other fields. In Go language, it is often necessary to pass parameters through command line parameters. Let's discuss the parsing implementation of command line parameters in Go language.

In the Go language, the standard library flag is the best choice for handling command line parameters. flag Helps us parse the corresponding values ​​​​from the command line parameters and store them in the defined structure. Let's take a look at how to use the flag package to process command line parameters.

First, we define a structure Config to store the value of the command line parameter:

type Config struct {
    Host    string
    Port    int
    Debug   bool
}

Then, we use the flag package to define the command line parameters and store the values ​​into Config. The following is an example:

func ParseCmdLineArgs() *Config {
    config := &Config{}
    flag.StringVar(&config.Host, "host", "localhost", "服务器地址")
    flag.IntVar(&config.Port, "port", 8080, "服务器端口")
    flag.BoolVar(&config.Debug, "debug", false, "是否开启调试模式")
    flag.Parse()
    return config
}

In the above code, we use functions such as flag.StringVar, flag.IntVar and flag.BoolVar to Define different types of command line parameters and store their values ​​in the Config structure respectively. Among them, the first parameter is the pointer of the variable that receives the command line parameter, the second parameter is the name of the command line parameter, the third parameter is the default value of the command line parameter, and the fourth parameter is the description of the command line parameter. Finally, we call the flag.Parse() function to parse the command line parameters.

Now, we can use the variables in the config structure to get the values ​​of the command line parameters in the code. For example, we can use config.Debug in the code to check whether debugging mode is enabled.

To summarize, in Go language, we can use the standard library flag to parse command line parameters. Define a structure to store the value of the command line parameter, and then use the flag function to save the value of the command line parameter into the structure. In this way, we can easily use the value of the command line parameter in the code.

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