[英]Powershell “cannot index into a null array” error occurs within a function only
當我嘗試運行我創建的用於匯總流量的 function 時,出現以下錯誤。 奇怪的是,當我自己運行這段代碼(不調用函數)時,它運行良好。
當我調用 function 時,我注意到了問題是當我嘗試使用索引時(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 { $_[1]} | ...
+ ~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : NullArray
代碼是這個
function Get-incapTraffic-90Days ($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
}
變量 $humanvisits 上的數據存儲如下。 我只需要總結小的價值。
1564531200000 69 1571788800000 145 1565049600000 229 1569196800000 249 1569456000000 156 1568419200000 114 1567641600000 165
我認為您收到此錯誤是因為您使用的是 regex -match
運算符,但您沒有轉義要匹配的字符串中的點。
嘗試:
$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)
我發現了這個問題。
我將參數傳遞給用逗號分隔的函數(菜鳥錯誤),對此感到抱歉。
function 將無法索引到 null 數組錯誤,因為搜索沒有將值作為錯誤的參數返回。
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