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首页 > 解决方案 > Powershell“无法索引到空数组”错误仅在函数内发生

arrays - Powershell“无法索引到空数组”错误仅在函数内发生

问题描述

当我尝试运行我创建的用于汇总流量的函数时，出现以下错误。奇怪的是，当我自己运行这段代码（不调用函数）时，它运行良好。

我在调用函数时注意到问题是当我尝试使用索引时（例如：$_[1]）

Cannot index into a null array.
At line:13 char:79
+         $sumhumanvisits = ($humanvisits[0..($humanvisits.Length)] | foreach { $_ ...
+                                                                               ~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : NullArray

Cannot index into a null array.
At line:16 char:73
+         $sumbotvisits = ($botvisits[0..($botvisits.Length)] | foreach { $_[1]} | ...
+                                                                         ~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : NullArray

代码是这个

function Get-incapTraffic-90Days ($site_id,$id,$key){

        #Incapsula visits in last 90 days
        $r2 = Invoke-WebRequest ("https://my.incapsula.com/api/stats/v1?api_id=" + $id + "&api_key=" + $key + "&time_range=last_90_days&site_id=" + $site_id + "&stats=visits_timeseries") -Method Post
        $visits = $r2.Content | ConvertFrom-Json

        $humanvisits = @(($visits.visits_timeseries | Where-Object {$_.id -match "api.stats.visits_timeseries.human"} | Select-Object data).data)
        #$humanvisits = $visits.visits_timeseries[0].data
        $botvisits = @(($visits.visits_timeseries | Where-Object {$_.id -match "api.stats.visits_timeseries.bot"} | Select-Object data).data)
        #$botvisits = $visits.visits_timeseries[1].data

        #Summarize Human visits
        $sumhumanvisits = ($humanvisits[0..($humanvisits.Length)] | foreach { $_[1]} | measure -Sum).Sum

        #Summarize Bot visits
        $sumbotvisits = ($botvisits[0..($botvisits.Length)] | foreach { $_[1]} | measure -Sum).Sum


        if (($sumhumanvisits -gt 0) -and ($sumbotvisits -gt 0)){

            $traffic = $sumhumanvisits.ToString() + " Human + " + $sumbotvisits + " Bots Traffic"
        }
        elseif($sumhumanvisits -gt 0){

            $traffic = ($sumhumanvisits.ToString() + " Human traffic")

        }
        elseif($sumbotvisits -gt 0){

            $traffic = ($sumbotvisits.ToString() + " Bot traffic")
        }
        else{

            $traffic = "No traffic"
        }
        Return $traffic
}

变量 $humanvisits 上的数据存储如下。我只需要总结小的价值。

1564531200000
69
1571788800000
145
1565049600000
229
1569196800000
249
1569456000000
156
1568419200000
114
1567641600000
165

标签： arraysfunctionpowershell

解决方案

我认为您收到此错误是因为您使用的是正则表达式-match运算符，但您没有转义要匹配的字符串中的点。

尝试：

$reHuman = [regex]::Escape("api.stats.visits_timeseries.human")
$reBot   = [regex]::Escape("api.stats.visits_timeseries.bot")
$humanvisits = @(($visits.visits_timeseries | Where-Object {$_.id -match $reHuman} | Select-Object data).data)
$botvisits = @(($visits.visits_timeseries | Where-Object {$_.id -match $reBot} | Select-Object data).data)

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