SendMessage 导致脚本挂起 [英] SendMessage is causing script to hang

问题描述

我遇到了一个问题，即 SendMessage() 函数导致脚本挂起，因此虽然它正在像它应该的那样运行 SendMessage(它的任务完成)但永远不会退出.有没有办法解决这个问题，因为我有一段时间从主脚本中杀死它.

I am having an issue where the SendMessage() function is causing a script to hang and thus never exiting though it is running the SendMessage like it should (Its task completes). Is there anyway to get around this because I am having a heck of a time killing it from the master script.

Stop-job -name offmon

或

Remove-job -name offmon -force

不会杀死它.如果没有对 remove-job 施加强制力，它报告说它无法杀死它，因为它还没有完成.

will not kill it. With out the force on remove-job it reports it cannot kill it because it is not finished.

我每天需要多次调用此方法，每次调用都会生成一个新的 powershell.exe，占用大约 30M 的内存.

I need to call this many times per day and each time I do it spawns a new powershell.exe eating about 30M of memory.

注意:如果您运行该代码，代码将关闭您的显示器，并且@"需要位于行首(不能将其标记为好看).

Note: The code will turn of your monitors if you run it and the "@ needs to be at the beginning of the line (can't tab it over to look nice).

start-job -Name offmon -ScriptBlock { 
$HWND = -1
$WM_SYSCOMMAND = 0x0112
$SC_MONITORPOWER = 0xF170
$MONITOR_ON = -1
$MONITOR_OFF = 2
#Store the C# signature of the SendMessage function. 
$signature = @"
[DllImport("user32.dll")]
public static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);
"@
#Add the SendMessage function as a static method of a class
$SendMessage = Add-Type -MemberDefinition $signature -Name "Win32SendMessage" -Namespace Win32Functions -PassThru
#Invoke the SendMessage Function
$SendMessage::SendMessage($HWND, $WM_SYSCOMMAND, $SC_MONITORPOWER, $MONITOR_OFF)
exit}

此外，如果没有启动作业，这也会挂起，所以我认为它与 start-job 导致脚本挂起. MS 支持.此外，这是 Win7Ent/2008R2.

Also this hangs just the same without start-job so I do not believe it is related to start-job causes scripts to hang. MS Support. Further this is Win7Ent/2008R2.

谢谢！

错别字

推荐答案

将 SendMessage 更改为 PostMessage.它对我有用.

Change SendMessage to PostMessage. It worked for me.

区别在于 PostMessage 是异步，不需要等待任何响应.

The difference is that PostMessage is asynchronous and it doesn't have to wait for any response.

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