Question

我正在将文本文件从Excel发送到Raspberry Pi，树莓派将在其中读取该文件并在其中输入内容。输入只是一行，它是一个简单的数字，仅此而已（40,38等）

当我运行此宏时，我可以在PC上完美地看到输入文件，但是当我在Pi中打开它时，例如：

我PC中的输入文件是：

Raspberry中的输入文件为：

ÿþ6

我如何确保此号码按原样发送给Pi。或者如何将其解码为我的python脚本可以理解的内容。我不会在此数字上使用小数，并且它是否作为字符串发送也没有关系，因为以后我可以在python代码中对其进行解析。

下面是我的Excel宏

Sub Send()

    Dim sleeptime As String
    sleeptime = InputBox("Duration between each reading in seconds?")

    Dim fso As Object
    Set fso = CreateObject("Scripting.FileSystemObject")

    Dim Fileout As Object
    Set Fileout = fso.CreateTextFile("C:\Users\xx\Desktop\VBA\input.txt", True, True)
    Fileout.Write sleeptime
    Fileout.Close
    Set fso = Nothing
    Set Fileout = Nothing


    Const cstrSftp As String = """C:\Program Files\PuTTY\pscp.exe"""
    Dim strCommand As String
    Dim pUser As String
    Dim pPass As String
    Dim pHost As String
    Dim pFile As String
    Dim pRemotePath As String

    pUser = "pi" '//user on remote system
    pPass = "xx" '//user's password on remote system
    pHost = "192.168.x.xx" '//ip address of remote system
    pFile = "C:\Users\xx\Desktop\VBA\input.txt" '//file to transfer
    pRemotePath = "/home/pi/Temp_Codes" '//directory where file will be transferred to

    strCommand = cstrSftp & " -sftp -l " & pUser & " -pw " & pPass & _
        " " & pFile & " " & pHost & ":" & pRemotePath
    Debug.Print strCommand
    Shell strCommand, 0 ' vbHide

End Sub

这些是我使用此输入文件的Raspberry Pi脚本内的行。稍后，我在time.sleep中使用此sleeptime值。

with open('input.txt', 'r') as myfile:
    sleeptime = myfile.read()

sleeptime = float(sleeptime.strip())

这是一个简单的代码，我正在运行以测试此编码内容：

#!/usr/bin/env python

import io

with io.open('input.txt', 'r', encoding='utf-8-sig') as myfile:
    sleeptime = myfile.read()

sleeptime = float(sleeptime.strip())

这是我到目前为止遇到的错误。

pi@raspberrypi:~/Temp_Codes $ python try.py
Traceback (most recent call last):
  File "try.py", line 6, in <module>
    sleeptime = myfile.read()
  File "/usr/lib/python2.7/codecs.py", line 314, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
  File "/usr/lib/python2.7/encodings/utf_8_sig.py", line 66, in _buffer_decode
    return codecs.utf_8_decode(input, errors, final)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xff in position 0: invalid start byte

Answer 1

Excel / VBA通过“ CreateTextFile”创建Unicode文件时，会将其保存为UTF-16编码。您将看到的是BOM（字节顺序标记）。

您可以更改

export class TableFilteringExample implements OnInit
{
  displayedColumns: string[] = ['position', 'name', 'weight', 'symbol'];
  dataSource = new MatTableDataSource(ELEMENT_DATA);

  positionFilter = new FormControl();
  nameFilter = new FormControl();

  filteredValues =
  {
    position: '',
    name: '',
    weight: '',
    symbol: ''
  };

  ngOnInit()
  {
    this.positionFilter.valueChanges.subscribe((positionFilterValue) =>
    {
      this.filteredValues['position'] = positionFilterValue;
      this.dataSource.filter = JSON.stringify(this.filteredValues);
    });

    this.nameFilter.valueChanges.subscribe((nameFilterValue) =>
    {
      this.filteredValues['name'] = nameFilterValue;
      this.dataSource.filter = JSON.stringify(this.filteredValues);
    });

    this.dataSource.filterPredicate = this.customFilterPredicate();
  }

  applyFilter(filterValue: string)
  {
    this.dataSource.filter = filterValue.trim().toLowerCase();
    this.dataSource.filter = filterValue;
  }

  customFilterPredicate()
  {
    const myFilterPredicate = function(data: PeriodicElement, filter: string): boolean
    {
      let searchString = JSON.parse(filter);

      return data.position.toString().trim().indexOf(searchString.position) !== -1 && data.name.toString().trim().toLowerCase().indexOf(searchString.name)!== -1;
    }

    return myFilterPredicate;
  }
}

到

CreateTextFile("C:\Users\xx\Desktop\VBA\input.txt", True, True)

这将另存为ASCII文本文件。或者，您可以使用

在Pi / Python方面进行更改

CreateTextFile("C:\Users\xx\Desktop\VBA\input.txt", True, False)

将输入文件从Excel VBA发送到Raspberry Pi，而不更改内容

1 个答案: