Simple CSV lib writen by golang solves the encoding nightmare while exporting records. Both on Windows and MacOS with Microsoft Excel, Apple Numbers.
The encoding of CSV files is a nightmare. Some old versions of Microsoft Excel drop the Unicode BOM, althrogh you try to add '0xEF, 0xBB, 0xBF' with UTF-8 encoding. For Example, Excel 2003, Excel 2007. However the newer versions have no problems. Maybe you will use "encoding/csv" lib, but it does not solve the encoding problem.
| Bytes | Encoding Form |
|---|---|
| 00 00 FE FF | UTF-32, big-endian |
| FF FE 00 00 | UTF-32, little-endian |
| FE FF | UTF-16, big-endian |
| FF FE | UTF-16, little-endian |
| EF BB BF | UTF-8 |
UTF-16 is the key point. But the comma delimiter does not work. We should replace "," with "\t". So this is not a standard CSV format as "Comma Seperated Values". And this is why when you use standard lib "encoding/csv" and encode your records with UTF-16 and the result is still not what you want. Here I choose UTF-16 little-endian.
buf := bytes.NewBuffer(nil)
w := csv.NewWriter(buf)
titles := []string{ "id", "name" }
if err := w.Write(titles); err != nil {
return err
}
// fetch data records
rows := db.getRecords()
for _, row := range rows {
row := []string{ row.ID, row.name }
if err := w.Write(row); err != nil {
return err
}
}
w.Flush()
fmt.Println(buf.String())// gin framework
func ExportCsv(ctx *gin.Context, name string, data string) {
ctx.Header("Content-Disposition", "attachment;filename="+name+".csv")
ctx.Header("Content-Transfer-Encoding", "binary")
// UTF-16LE
ctx.Data(http.StatusOK, "text/csv;charset=UTF-16LE", []byte(data))
}
ExportCsv(ctx, "file", buf.String())MIT License
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