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 <input>\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 <input>\toutputs unicode info on the raw unporocessed input.\t")
    fmt.println(writer, "  uni decomp <input\toutputs the input with all characters decomposed.\t")
    fmt.println(writer, "  uni comp <input>\toutputs the input with all characters composed.\t")
    fmt.println(writer, "  uni short <input>\toutputs basic info about the input, one character per line.\t")
    fmt.println(writer, "  uni rawshort <input>\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 <input>    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 <input>    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 <input  outputs the input with all characters decomposed.   
&{0xc000006018 100 8 1 [32 32 32 32 32 32 32 32] 0 [] 0 {0 0 false} 0 [[]] []}   uni comp <input>   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 <input>  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 <input>   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 <input>           Outputs Unicode info for the input.
                        Processes U+xxxx sequences into the appropriate characters and treats control characters as control.
  uni raw <input>       Outputs Unicdoe info on the raw unporocessed input.
  uni decomp <input     Outputs the input with all characters decomposed.
  uni comp <input>      Outputs the input with all characters composed.
  uni short <input>     Outputs basic info about the input, one character per line.
  uni rawshort <input>  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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