golang中tabwriter输出乱码和格式不准确

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我正在尝试使用制表符打印帮助消息：

func printhelp() {
    writer := tabwriter.newwriter(os.stdout, 100, 8, 1, ' ', 0)
    fmt.println(writer, "uni outputs unicode information for characters.")
    fmt.println(writer, "usage:")
    fmt.println(writer, "  uni \toutputs unicode info for the input.\t")
    fmt.println(writer, "\tprocesses u+xxxx sequences into the appropriate characters and treats control characters as control.\t")
    fmt.println(writer, "  uni raw \toutputs unicode info on the raw unporocessed input.\t")
    fmt.println(writer, "  uni decomp \toutputs the input with all characters composed.\t")
    fmt.println(writer, "  uni short \toutputs basic info about the input, one character per line.\t")
    fmt.println(writer, "  uni rawshort \toutputs basic info about the raw unprocessed input, one character per line.\t")
    fmt.println(writer, "  uni help\tprints this help message.\t")
    writer.flush()
}

但是，输出包含大量不应打印的内部垃圾，并且未正确对齐列。

这是我得到的：

&{0xc000006018 100 8 1 [32 32 32 32 32 32 32 32] 0 [] 0 {0 0 false} 0 [[]] []} uni outputs unicode information for characters.
&{0xc000006018 100 8 1 [32 32 32 32 32 32 32 32] 0 [] 0 {0 0 false} 0 [[]] []} usage:
&{0xc000006018 100 8 1 [32 32 32 32 32 32 32 32] 0 [] 0 {0 0 false} 0 [[]] []}   uni     outputs unicode info for the input. 
&{0xc000006018 100 8 1 [32 32 32 32 32 32 32 32] 0 [] 0 {0 0 false} 0 [[]] []}  processes u+xxxx sequences into the appropriate characters and treats control characters as control.    
&{0xc000006018 100 8 1 [32 32 32 32 32 32 32 32] 0 [] 0 {0 0 false} 0 [[]] []}   uni raw     outputs unicode info on the raw unporocessed input. 
&{0xc000006018 100 8 1 [32 32 32 32 32 32 32 32] 0 [] 0 {0 0 false} 0 [[]] []}   uni decomp    outputs the input with all characters composed. 
&{0xc000006018 100 8 1 [32 32 32 32 32 32 32 32] 0 [] 0 {0 0 false} 0 [[]] []}   uni short   outputs basic info about the input, one character per line. 
&{0xc000006018 100 8 1 [32 32 32 32 32 32 32 32] 0 [] 0 {0 0 false} 0 [[]] []}   uni rawshort    outputs basic info about the raw unprocessed input, one character per line. 
&{0xc000006018 100 8 1 [32 32 32 32 32 32 32 32] 0 [] 0 {0 0 false} 0 [[]] []}   uni help   prints this help message.

这大概就是我想要的

uni outputs Unicode information for characters.
USAGE:
  uni            Outputs Unicode info for the input.
                        Processes U+xxxx sequences into the appropriate characters and treats control characters as control.
  uni raw        Outputs Unicdoe info on the raw unporocessed input.
  uni decomp       Outputs the input with all characters composed.
  uni short      Outputs basic info about the input, one character per line.
  uni rawshort   Outputs basic info about the raw unprocessed input, one character per line.
  uni help              Prints this help message.

我尝试过将最小单元格宽度更改为各种值，从 0 到数百，它改变了对齐方式，但没有达到正常工作的程度。我尝试过制表符与空格分隔符以及右对齐与默认（左）对齐，没有任何差异。

正确答案

要写入 io.writer，请使用 fmt.Fprintln（或 fmt.fprintf）而不是 fmt.Println：

// fmt.Println(writer, "uni outputs Unicode information for characters.")

fmt.Fprintln(writer, "uni outputs Unicode information for characters.")

fmt.println 将尽最大努力只渲染每个参数 - 这就是为什么您会看到制表符的内部反射状态。

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