invocation

问题 It seems most documentation or helper libraries relating to JNI (Java Native Interface) are concerned with calling native code from Java. This seems to be the main use of it, even though it is capable of more. I want to mostly work in the opposite direction: modify an existing (fairly large) portable C++ program by adding some Java libraries to it. For example, I want to make it call databases via JDBC, or message queue systems via JMS, or send emails, or call my own Java classes, etc. But

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I have an assignment in which I have to perform operations on array in Java, I have to make separate functions of each operation, which I will write but I can not figure out how to invoke a method with array parametres. I usually program in c++ but this assignment is in java. If any of

问题 I wanted to set cron job from php script file. I can able to execute php file using shell_exec() function. But Im not able to run cron job related commands. $output = shell_exec("crontab -l"); this command is not working. My cronjob located under /usr/bin/crontab. I set the file premission to 777 and im executing this command with root access. still no luck. can anyone help me? 回答1: Your "crontal -l" command just displays what's scheduled for your user in its personal crontab. It might return

问题 I have a command button on a winform. So, if I have something like: myButton.Click += MyHandler1; myButton.Click += MyHandler2; myButton.Click += MyHandler3; How can I tell if any particular MyHandler has already been added to the Click event so it doesn't get added again somewhere else in my code? I've read how you can use GetInvocationList() for your own event's information. But I get errors when trying to get the items for my command button using various combinations. It says, "The event

问题 When I try to do the following: var getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia; // now I try to invoke it with some parameters: getUserMedia(...) // not working! It throws an error "Illegal Invocation" in Chrome. But if I do: navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia; // now invoke it with the navigator navigator.getUserMedia(..) // Works I've tried searching a bit, and I

问题 I just created the following minimalistic testcase: package testcase; public class Main { public static void main( String[] args ) throws Throwable { if ( args.length == 0 ) Main.class.getMethod( "main", String[].class ).invoke( null, new String[] { "test" } ); } } It should just run, with no output and no exception. The main method should be calling itself using reflection. However I get the following exception: Exception in thread "main" java.lang.IllegalArgumentException: argument type

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: How to access the Java method in a C++ application I need to use JAR file in c++ program. i.e. from c++ i need to call java function, for example, In java there is a function who accept 2 integer and return addition of that, Now i need to call this function from c++. Please guide me Thanks in advance. 回答1: You need to use the Java Invocation API , described here. This example code (from that link) shows how to

问题 After doing some reading I understand that handlers invocation order is the same order as subscribed but it is not guaranteed . So lets say I have : public event MYDEl ev; and subscribers do : ev+=GetPaper; ev+=Print; ev+=EjectPaper; What is the best practice mechanism of preserving +assuring the execution list order ? 回答1: If it's a field-like event, it will use simple delegate combination as per Delegate.Combine, and that is guaranteed to preserve subscription order. From the docs for the

问题 I'd like to create an anonymous function and then invoke it immediately. 1) This will bring a syntax error. Why? function () { alert("hello"); }(); 2) wrap the function definition with () and it works. (function () { alert("hello"); })(); 3) or, assign the anonymous function to a variable. It works. var dummy = function() { alert("hello"); }(); Why the first way doesn't work? 回答1: The ECMAScript Language Specification, section 12.4, says: An ExpressionStatement cannot start with the function

问题 I was wondering what the 'this' value (or invocation context) is of the forEach callback function. This code doesn't seem to work: var jow = [5, 10, 45, 67]; jow.forEach(function(v, i, a){ this[i] = v + 1; }); alert(jow); Thx for explaining it to me. 回答1: MDN states: array.forEach(callback[, thisArg]) If a thisArg parameter is provided to forEach, it will be used as the this value for each callback invocation as if callback.call(thisArg, element, index, array) was called. If thisArg is