exception

问题 I'm getting a crash EXC_Breakpoint which would indicate to me that there is a nil variable being unwrapped? The line of code it is pointing to is the definition of let obHeight : if let qs = Helper_Question.getSection(sid: self.sections[0].sid) { let obEnabled = Helper_Type.getId(id: tid)?.enableObservation == 1 for q in qs { let ans = Helper_Answer.getQuestion(aid: selectedAid!, qid: q.Id) var baseHeight : CGFloat = 300 switch(q.qtype){ case Constants.DEFAULT: let obHeight : CGFloat =

问题 Suppose a well-structured OOP Python application, where every call to a method is wrapped in a try block. Now suppose that I'm debugging this application and I want the exceptions to actually be thrown! It would be neigh impossible to replace every try: line with if True: and to comment out """ the except: portions, just to debug. Is there any way to tell the Python interpreter that an exceptions thrown by a specific portion of code should stop program execution and print the exception

问题 I'm learning reactive programming with Reactor and I want to implement registration scenario where a user can have many accounts assigned to the same profile. However the username assigned to the profile and the phone assigned to the account must be unique. As you can see in the following snippet, this scenario will be easy to implement if Reactor was offering the operator switchIfNotEmpty . public Mono<PersonalAccountResponse> createPersonalAccount(PersonalAccountRequest request) { return

问题 I'm a Java newbie and can't seem to figure out why this crude, 20 minute app is throwing that exception. Basically I am parsing a 192MB (yes, 192MB) tab-delimited text file and storing the contents into MongoDB. package get_alternatenames; import java.io.BufferedReader; import java.io.FileReader; import com.mongodb.Mongo; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.BasicDBObject; import com.mongodb.DBObject; import com.mongodb.DBCursor; import java.util.Set; /**

问题 I have a Java class pojo in which I want the Object.toString() method to return a JSON representation of the object. The users of toString() want JSON only. This is my toString(). import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.ObjectWriter; @Override public String toString(){ ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter(); String json = null; try { json = ow

问题 I am trying to write a program to ask a user to enter their age and prompt them to re-enter if they enter an improper value (such as a negative number, older than 120, an age with special characters or letters, an out of range number etc...) I tried writing a try/catch to ask the user to re-enter their age: System.out.println("Enter your age (a positive integer): "); int num; try { num = in.nextInt(); while (num < 0 || num > 120) { System.out.println("Bad age. Re-enter your age (a positive

问题 After installing SWI-Prolog in my computer, I went on to try one of its examples, and found out this particular beauty: run: Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\Program Files (x86)\swipl\bin\jpl.dll: Can't find dependent libraries at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1807) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1732) at java.lang.Runtime.loadLibrary0(Runtime.java:823) at java

问题 I want my app to show data about Gold Prices. I am able to run my app on emulators(GenyMotion) on Android 5.0,4.4.4 and 4.3 but if run on actual device I am getting the following error(attached the screenshot) (4.4.4).I am able to run on an actual device(4.0.3) .I have searched regarding this but I could not find a solution on this.can anybody help regarding this ? [SSL Handshake Exception ] : (http://s13.postimg.org/bk7m0fqc7/unnamed.jpg 来源： https://stackoverflow.com/questions/28217224

问题 We have a sample application with such handler for a combobox in "DropDownList" mode: private void comboBox1_Leave(object sender, EventArgs e) { comboBox1.SelectionStart = 0; comboBox1.SelectionLength = 0; } the code above behaves differently depending whether the application has CALLWNDPROC hook loaded or not. If application has a CALLWNDPROC hook in it - the code above would throw exception whenever combobox loses focus. Without the hook - that code doesn't throw. these are few lines from

问题 I am implementing logging of error message (It includes information of exception backtrace). I asked similar question how to do this at Reliable way to print exception backtrace in catch handler?. I decided to check out callstacks at x86 and x64 platforms. Result of stack comparisons surprised me. Here is my program: #include <iostream> #include <Windows.h> using namespace std; struct A { }; void foo3() { throw A(); } void foo2() { foo3(); } void foo1() { foo2(); } void foo() { try { foo1();