Question

我有一个条形码扫描脚本。它会打开手持扫描仪的RS323端口 “ DataReceived”上的注册对象事件运行动作脚本块以更新数据库字段。

这一切都正常运行时（从主线程运行），但是现在我想从运行空间执行相同操作，并将条形码返回到主线程。这样我就不会阻塞正在运行的线程。

$bcHandler =[runspacefactory]::CreateRunspace()

# set Single Threaded Apartment and reuse thread
$bcHandler.ApartmentState = "STA"
$bcHandler.ThreadOptions = "ReuseThread"      
# Open the runspace
$bcHandler.Open()

$psCmd = [PowerShell]::Create().AddScript({
    Param($ComPort="COM3")

    $port= new-Object System.IO.Ports.SerialPort $ComPort,9600,None,8,one

    Register-ObjectEvent -InputObject $port -EventName "DataReceived" -SourceIdentifier $port.PortName -Action {

        # start stopwatch for perforance measurements
        $StopWatch = [System.Diagnostics.Stopwatch]::StartNew()

        # Read scanner buffer
        $Result = ($port.ReadExisting() | Out-String).Trim()

        # Send beep to handheld scanner
        $port.Write([char]7,0,1)
    }
})


# Open the runspace
$psCmd.Runspace = $bcHandler
$Handler = $psCmd.BeginInvoke()

Answer 1

您可以使用同步哈希表存储结果数据，这将使您可以从父运行空间查看数据

$Global:syncHash = [hashtable]::Synchronized(@{})

$bcHandler =[runspacefactory]::CreateRunspace()

# set Single Threaded Apartment and reuse thread
$bcHandler.ApartmentState = "STA"
$bcHandler.ThreadOptions = "ReuseThread"   
# Open the runspace
$bcHandler.Open()
#Synch the HashTable between runspaces
$bcHandler.SessionStateProxy.SetVariable("syncHash", $syncHash)

$psCmd = [PowerShell]::Create().AddScript({
    Param($ComPort="COM3")

    $port= new-Object System.IO.Ports.SerialPort $ComPort,9600,None,8,one

    Register-ObjectEvent -InputObject $port -EventName "DataReceived" -SourceIdentifier $port.PortName -Action {

        # start stopwatch for perforance measurements
        $StopWatch = [System.Diagnostics.Stopwatch]::StartNew()

        # Read scanner buffer
        $syncHash.Result = ($port.ReadExisting() | Out-String).Trim()

        # Send beep to handheld scanner
        $port.Write([char]7,0,1)
    }
})


# Open the runspace
$psCmd.Runspace = $bcHandler
$Handler = $psCmd.BeginInvoke()

然后您可以使用$syncHash.Result

访问结果

运行空间中的Register-ObjectEvent

1 个答案: