reflection

问题 I am trying to use reflection to set a pointer. elasticbeanstalk.CreateEnvironmentInput has a field SolutionStackName which is of type *string . I am getting the following error when I try to set any value: panic: reflect: call of reflect.Value.SetPointer on ptr Value Here is my code: ... newEnvCnf := new(elasticbeanstalk.CreateEnvironmentInput) checkConfig2(newEnvCnf, "SolutionStackName", "teststring") ... func checkConfig2(cnf interface{}, key string, value string) bool { log.Infof("key %v,

问题 Intro: I'm writing web interface with SQLAlchemy reflection that supports multiple databases. It turns out that authors of application defined postgresql with lowercase tables/columns, eg. job.jobstatus while sqlite has mixed case, eg Job.JobStatus . I'm using DeclarativeReflectedBase from examples to combine reflection and declarative style. The issue: Configure SQLAlchemy to work with tables/columns case insensitive with reflection I have done so far: I have changed DeclarativeReflectedBase

问题 Intro: I'm writing web interface with SQLAlchemy reflection that supports multiple databases. It turns out that authors of application defined postgresql with lowercase tables/columns, eg. job.jobstatus while sqlite has mixed case, eg Job.JobStatus . I'm using DeclarativeReflectedBase from examples to combine reflection and declarative style. The issue: Configure SQLAlchemy to work with tables/columns case insensitive with reflection I have done so far: I have changed DeclarativeReflectedBase

问题 I'm trying to workaround the difficulties in binding to a Dictionary in WinRT Xaml (also referenced here). I want to use a converter to do this rather than having to change all of my view-models or business code to return a List of a custom Key Value class. This means I need to cast an object to a List<> of some type. public object Convert(object value, Type targetType, object parameter, string temp) { if(value is IDictionary) { dynamic v = value; foreach (dynamic kvp in v) { } } return /

问题 I'm trying to workaround the difficulties in binding to a Dictionary in WinRT Xaml (also referenced here). I want to use a converter to do this rather than having to change all of my view-models or business code to return a List of a custom Key Value class. This means I need to cast an object to a List<> of some type. public object Convert(object value, Type targetType, object parameter, string temp) { if(value is IDictionary) { dynamic v = value; foreach (dynamic kvp in v) { } } return /

问题 I'm trying to workaround the difficulties in binding to a Dictionary in WinRT Xaml (also referenced here). I want to use a converter to do this rather than having to change all of my view-models or business code to return a List of a custom Key Value class. This means I need to cast an object to a List<> of some type. public object Convert(object value, Type targetType, object parameter, string temp) { if(value is IDictionary) { dynamic v = value; foreach (dynamic kvp in v) { } } return /

问题 I’m trying to implement a router pattern in Swift and can’t figure out how to dynamically call a method. For example, there’s an array of arguments: let arguments: [Any] = [100, 0.5, "Test"] And a handler which needs to be called: public class MyClass { public func handler(value1: Int, value2: Double, text: String) { print("int=\(value1), double=\(value2), string=\(text)") } } let myClass = MyClass() The router has an untyped function reference which it will use as a callback: let callback:

问题 What I mean by this, is opening a file with a Java code in it as a class, not as a file. So basically I want to: -> Open a pure text file in a self written Java application (.txt/.log/.java) -> Recognize class(es) in the file, for example: public class TestExample { private String example; public String getExample() { return example; } } I will open this in a hand-written program. Instead of recognizing the text in the file as a String or as pure text, it will find the class TestExample in it

问题 Hi I've already worked with Reflection in Java. But if you are using the java standards (e.g. injecting a private field) you have to write a lot of code to get the job done. What is the shortest way to inject a private field in a Java Object? Are there implementations in widely used and production ready libraries? 回答1: Without using external libraries you need to: get the Field instance set the field instance as accessible set the new value As follow: Field f1 = obj.getClass()

问题 I'm trying to compare this two ways to achieving the enums values (with and without reflection). So this is my test class: public class ReflectionOnEnumsTests2 { enum TestEnum { ONE, TWO, THREE; } public static void main(String[] args) { long n = 600_000_000; int stub; //test without Reflection long timeStartWithoutReflection = System.currentTimeMillis(); for (int i = 0; i < n; i++){ TestEnum[] values = TestEnum.values(); stub = values.length; } System.out.println("Time consuming with