parameter-passing

问题 I am trying to run a shell command from within awk for each line of a file, and the shell command needs one input argument. I tried to use system() , but it didn't recognize the input argument. Each line of this file is an address of a file, and I want to run a command to process that file. So, for a simple example I want to use 'wc' command for each line and pass $1 to wc. awk '{system("wc $1")}' myfile 回答1: you are close. you have to concatenate the command line with awk variables: awk '

问题 I'm using plupload, the JQuery UI implementation. I'm trying to pass additional parameters to the server, but I can't make it work. It should be pretty straightforward, the parameters are already set when the function is executed, so that should not be a problem. I've tried this: function GetPlUploader(m) { $("#divOpplaster").plupload( { // General settings runtimes: 'flash,html5,silverlight', url: 'upload.php', max_file_size: '10mb', chunk_size: '1mb', unique_names: true, multipart: true,

问题 I'm using plupload, the JQuery UI implementation. I'm trying to pass additional parameters to the server, but I can't make it work. It should be pretty straightforward, the parameters are already set when the function is executed, so that should not be a problem. I've tried this: function GetPlUploader(m) { $("#divOpplaster").plupload( { // General settings runtimes: 'flash,html5,silverlight', url: 'upload.php', max_file_size: '10mb', chunk_size: '1mb', unique_names: true, multipart: true,

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Is Java pass by reference? public class myClass{ public static void main(String[] args){ myObject obj = new myObject("myName"); changeName(obj); System.out.print(obj.getName()); // This prints "anotherName" } public static void changeName(myObject obj){ obj.setName("anotherName"); } } I know that Java pass by value, but why does it pass obj by reference in previous example and change it? 回答1: Java always passes

问题 First apologies as there are similar questions on this site, but none of them answer this problem directly. Im using typed datasets in VS 2010. I create a TableAdapter in a Dataset with a query like: SELECT * from Table WHERE ID IN(@IDs) Now if I call: TableAdapter.Fill(MyDataTable,"1,2,3") an error occurs stating that VS cannot convert 1,2,3 to type int. Fair enough. So then i decide to change the Parameter (i.e. @IDs) type to string in the Parameter collection. Try again - still the same

问题 This question already has answers here : What does map(&:name) mean in Ruby? (15 answers) Closed 5 years ago . I saw the code from here Post.published.collect(&:views_count) I guess it equals to .collect { |p| p.views_count } But I never saw this usage before, does this have a name? Where can I find more information about it? 回答1: This is actually a rather clever hack made it into ruby 1.9. Basically, & in front of a variable in ruby coerces it into a proc. It does that by calling to_proc .

问题 Could someone please explain the difference between parameter passing in C please? According to professor notes there are 4 different ways to pass parameters Call-by-value Call-by-address (pointer) Call-by-alias Global variable / Static variable If you could please give an example, I would greatly appreciate that, and your work would be commended. 回答1: Call-by-value Passing the value to a function as a parameter. If the function modifies the variable, the actual variable won't get changed.

问题 I give a string variable a value in the normal execution of the code ,but if an exception happen I will give it another value , the problem is that in catch block the value is still the same as i assign first . Here is my code ,first I assign page value "addUser" inside try block and in catch I give it "ErrorPage" value , I send the value of page within http request to forword method and inside it i print the value of page. I cause an error in the excution of the code an i want it to go

问题 In Ruby, is it possible to pass by reference a parameter with value-type semantics (e.g. a Fixnum)? I'm looking for something similar to C#'s ' ref ' keyword. Example: def func(x) x += 1 end a = 5 func(a) #this should be something like func(ref a) puts a #should read '6' Btw. I know I could just use: a = func(a) 回答1: You can accomplish this by explicitly passing in the current binding: def func(x, bdg) eval "#{x} += 1", bdg end a = 5 func(:a, binding) puts a # => 6 回答2: Ruby doesn't support

问题 Using jQuery's 'submit' - is there a way to pass additional parameters to a form? I am NOT looking to do this with Ajax - this is normal, refresh-typical form submission. $('#submit').click(function () { $('#event').submit(function () { data: { form['attendees'] = $('#attendance').sortable('toArray').toString(); }); }); 回答1: This one did it for me: var input = $("<input>") .attr("type", "hidden") .attr("name", "mydata").val("bla"); $('#form1').append(input); is based on the Daff's answer, but