Question

我有一个从yahoo finance下载CSV文件的powershell脚本，我的目标是将其转换为excel文件（.xlsx）。脚本是：

$path = "D:"

$client = New-Object System.Net.WebClient
$url = "http://download.finance.yahoo.com/d/quotes.csv?s=EDV,VEA,VWO,VHT,BND,VTI&f=sl1d1t1c1ohgv&e=.csv"
$csv_filename = Join-Path $path "prices.csv"
$client.DownloadFile($url, $csv_filename)

$xl_filename = Join-Path $path "prices.xlsx"

$xl = New-Object -COM "Excel.Application"
$xl.Visible = $true

$wb = $xl.Workbooks.OpenText($csv_filename)
$wb.SaveAs($xl_filename, 51)
$wb.Close()

$xl.Quit()
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($xl)

该脚本位于`D：\ get_prices.ps1＆＃39;我用

执行它

C：\ Windows \ System32 \ WindowsPowerShell \ v1.0 \ powershell.exe -ExecutionPolicy Unrestricted -File D：\ get_prices.ps1

当我运行它时，我得到两个错误：

You cannot call a method on a null-valued expression.
At D:\get_prices.ps1:14 char:11
+ $wb.SaveAs <<<< ($xl_filename, 51)
    + CategoryInfo          : InvalidOperation: (SaveAs:String) [], RuntimeExc
   eption
    + FullyQualifiedErrorId : InvokeMethodOnNull

You cannot call a method on a null-valued expression.
At D:\get_prices.ps1:15 char:10
+ $wb.Close <<<< ()
    + CategoryInfo          : InvalidOperation: (Close:String) [], RuntimeExce
   ption
    + FullyQualifiedErrorId : InvokeMethodOnNull

转换代码改编自此问答（How to export a CSV to Excel using Powershell）。

我查看了Workbook.SaveAs的文档，据我所知，我正确使用它，文件格式（51参数）也基于this。我还查看了Workbook.Close的文档，看起来一切都正确。

我在Windows 7 x64上使用PowerShell v2.0（根据get-host）和Excel 2013。

我做错了什么？

Answer 1

$xl.Workbooks.OpenText返回void而不是工作簿。

进行此更改：

$xl.Workbooks.OpenText($csv_filename)
$wb=$xl.ActiveWorkbook

使用PowerShell将csv文件转换为excel时，为什么会出现空值表达式错误？

1 个答案: