Reading and Writing Non-UTF-8 Text Files in Go
Background
By default, the standard library in Go assumes that text files are encoded in UTF-8. However, there are scenarios where you may encounter text files encoded in different encodings, such as GBK.
Solution
To read and write non-UTF-8 text files in Go, you can use the following steps:
Reading Non-UTF-8 Files
Create an io.Reader using transform.NewReader:
f, err := os.Open(filename) if err != nil { log.Fatal(err) } r := transform.NewReader(f, simplifiedchinese.GBK.NewDecoder())
Writing Non-UTF-8 Files
Create an io.Writer using transform.NewWriter:
f, err := os.Create(filename) if err != nil { log.Fatal(err) } w := transform.NewWriter(f, simplifiedchinese.GBK.NewEncoder())
Example
The following example shows how to read and write a GBK-encoded text file:
import ( "bufio" "fmt" "log" "os" "golang.org/x/text/encoding/simplifiedchinese" "golang.org/x/text/transform" ) func main() { const filename = "example_GBK_file" exampleWriteGBK(filename) exampleReadGBK(filename) } func exampleReadGBK(filename string) { f, err := os.Open(filename) if err != nil { log.Fatal(err) } r := transform.NewReader(f, simplifiedchinese.GBK.NewDecoder()) sc := bufio.NewScanner(r) for sc.Scan() { fmt.Printf("Read line: %s\n", sc.Bytes()) } if err := sc.Err(); err != nil { log.Fatal(err) } if err := f.Close(); err != nil { log.Fatal(err) } } func exampleWriteGBK(filename string) { f, err := os.Create(filename) if err != nil { log.Fatal(err) } w := transform.NewWriter(f, simplifiedchinese.GBK.NewEncoder()) // Write some text from the Wikipedia GBK page that includes Chinese _, err = fmt.Fprintln(w, `In 1995, China National Information Technology Standardization Technical Committee set down the Chinese Internal Code Specification (Chinese: 汉字内码扩展规范(GBK); pinyin: Hànzì Nèimǎ Kuòzhǎn Guīfàn (GBK)), Version 1.0, known as GBK 1.0, which is a slight extension of Codepage 936. The newly added 95 characters were not found in GB 13000.1-1993, and were provisionally assigned Unicode PUA code points.`) if err != nil { log.Fatal(err) } if err := f.Close(); err != nil { log.Fatal(err) } }
This code opens a GBK-encoded text file, reads its contents, and writes them to another GBK-encoded text file.
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