What should I do if golang cannot print?

In Golang, printing output (Print) is a very common operation. However, sometimes we encounter situations where printing output cannot be achieved when using Golang. This article will introduce the reasons and solutions for failure to print output in Golang.

1. Reasons why printout cannot be done

1. Variable types do not support output

In Golang, some variable types cannot be output directly. For example:

• chan type: The chan type is a channel type used to implement communication between coroutines. It usually blocks program execution and causes a deadlock or exception when printing output.
• Func type: In Golang, a function is also a type, but it cannot be output directly because it is a piece of executable code rather than a specific value.

2. Program exception interruption

When printing and outputting, if an exception occurs in the program, such as panic, etc., it will cause the program to be interrupted and cannot continue to execute, so it is also Printout cannot be made.

3. Encoding issues

In Golang, strings often involve encoding issues. If the string uses a non-ASCII character set encoding, such as UTF-8, GBK, etc., garbled characters or no output may appear when printing.

2. Solution

1. Convert the variable type to a type that supports output

In Golang, there are some variable types that support output. For example: int, string, bool, etc. If the variable cannot be output directly, you can consider converting it to a type that supports output, such as converting a chan type variable to a slice type variable.

2. Handling program exception

Before printing, you need to ensure that no exception occurs in the program. If an exception occurs in the program, you can use the recover function to resume program execution. For example:

defer func() {
    if err := recover(); err != nil {
        log.Println("程序发生异常：", err)
    }
}()

3. Handling encoding issues

When strings involve encoding issues, you can consider using the functions in the strconv package for encoding conversion, such as using strconv.Quote The function converts the string to ASCII encoding and then prints it.

fmt.Println(strconv.Quote(s))

The above is the method to solve the problem that Golang cannot print output. I hope it can be helpful to Golang developers.

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