parameter-passing

问题 I am trying to speed up the processing of a database. I migrated towards xargs. But I'm seriously stuck. Piping a list of arguments to xargs does not work if the command invoked by xargs isn't a built in. I can't figure out why. Here is my code: #!/bin/bash list='foo bar' test(){ echo "$1" } echo "$list" | tr '\012' '\000' | xargs -0 -n1 -I '{}' 'test' {} So there is no output at all. And test function never gets executed. But if I replace "test" in the "xargs" command with "echo" or "printf"

问题 I have this bit of code that works great: function displayVals() { var phonevals = $("#bphonesel").val(); $('#bphone').val(phonevals); } $("select").change(displayVals); displayVals(); I want to be able to reuse it for all the other select boxes I have on my site. So, I thought I'd use parameters to do it. However, I've so far been unable to get the syntax correct. Here's what I've got, but it doesn't work. Any help would be appreciated. function displayVals(inputfld, boundfld) { var nvenval

问题 The structure of my project is as follow: Proj Proj.pro --subProj --subProj.pro ----subsubProj ----subsubProj.pro Is there a way i can instance a global variable in subProj.pro and call it en e.g. subsubProj.pro like: Proj.pro: GLOBAL_VAR = true subsubProj.pro: message($$GLOBAL_VAR) Update Maybe I should more precise with my problem. The usual behavior in Qt Creator when you right-click on Proj and choose "Build project"Proj"" is that qmake Proj.pro gets invoked then qmake subProj.pro and

问题 I have a function called "tryMe" and I'm calling it without the parenthesis not precisely this but the idea is like what you would do here: setTimeout(tryMe,200); how can I pass parameters that I need? I am using a jquery plugin that enables me to call a function but I have to call it withou the parenthesis or it executes itself upon loading. 回答1: setTimeout(function() { tryMe(parm1, parm2); }, 200); A more robust offering, to ensure that the values of parm1 , parm2 don't change before the

问题 I see that CancellationToken is a struct https://docs.microsoft.com/en-us/dotnet/api/system.threading.cancellationtoken?view=netframework-4.7.1 If I pass a struct to a new function by value, it shouldn't be modified in the caller. So if i'm passing a CancellationTokenSource (by value), then I call cts.cancel(), how does the method that has a copy of that token is notified that it has been canceled? Shouldn't it work only if we pass by reference? For example: public static void Main() { var

问题 private void Method1() { //Do something Log("Something","Method1"); } private void Method2() { //Do something Log("Something","Method2"); } private void Log(string message, string method) { //Write to a log file Trace.TraceInformation(message + "happened at " + method); } I have several methods like Method1 and Method2 above, and i would like some way pass the method's name as a parameter, without manually editing the code. Is that possible? 回答1: Excellent answer from Jon Skeet. However, if

问题 I've been searching for a solution to this but couldn't find one. Not sure if its possible. Can I pass into command-line execution that passes a in a bat file which has an input file as its arguments? So from the command-line it'll look like this: C:\run.exe "C:\space folder\run.bat "C:\space folder\input.txt"" The problem is with the folders that has spaces so the quotes are required to be in there. 回答1: Try this: C:\run.exe "C:\space folder\run.bat \"C:\space folder\input.txt\"" And here is

问题 I have a litte radiobutton like this : <h:selectOneRadio value="#{test.answer}" valueChangeListener="#{TestService.changeanswer}" immediate="true" id="answer"> <f:selectItem itemValue="A" itemLabel="Absolutely True"/> <f:selectItem itemValue="B" itemLabel="True"/> <f:selectItem itemValue="C" itemLabel="Partially True"/> <f:selectItem itemValue="D" itemLabel="Not True"/> <f:selectItem itemValue="E" itemLabel="Definitely Not True"/> <f:ajax event="change" process="answer"></f:ajax></h

问题 For reasons that should not impact the current question I need to run a script, with the definition and parameters outside the command, inside a different PowerShell instance, without using PSSessions, background jobs or files (I have working examples for PSSession, background jobs and .ps1 files and I'm aware they can replace what I'm trying to do, but I need a working example with powershell.exe -Command as well). I looked at the help for powershell.exe, and it should support what I am

问题 I discovered today that in addition to objects and primitives, PHP has resources. The documentation states that by default php passes names by value. But we know that in PHP 5, objects are referenced by handle, and so while the handle is passed by value, you can treat the handles as references themselves, neatly avoiding the question. But what about resources ? Are they, like objects, just handles to be treated as references themselves, or are they actually values that get copied when they're