try-catch

问题 i am making an upload with Ajaxupload plugin and i am using this function in OnComplete event of ajaxupload; function degis(){ var a = "<?php echo $id; ?>"; document.getElementById("imga").src = "../artwork/"+a+"/logo.jpg?dummy=371662"; document.getElementById("imga").style.width = "500px"; document.getElementById("imga").style.height = "175px"; } but new uploaded image doesnt appear for a reason. i tried that "?dummy=371662" but didnt work. i am also using this for Onsubmit event of

问题 I'm trying to read a bunch of csv files in SQL Server using SQL Bulk Insert and DataContext.ExecuteCommand. (Maybe this isn't the best way to do it, but it does allow me stay in the Type Provider context--as opposed to with SqlBulkCopy I think.) Now the upload is glitchy with intermittent success. Some files read in, some fail with "Data conversion error (truncation)". I think this has to do with the row terminators not always working. When the upload works, it seems to be with the '0x0A'

问题 I'm currently creating my own container Lib, but I've seen that unreachable(invalidated if statement) try-catch block increased runtime time. So here is my test, Vector.cpp : template<class Type, class Allocator > void vector<Type, Allocator >::push_back(Type&& ObjectToPushBack) { if (_capacity == _size) { #if 1 try { emplace_back(std::move(ObjectToPushBack)); } catch (NullException& n) { std::cout << n.what() << std::endl; throw n; } #endif } else emplace_back_no_except(std::move

问题 Assuming Python version >=3 and calling a list of functions. I would like to write a lambda function that handles exceptions. Thing is, it does not work, when there is an exception thrown in a function, the program returns and the call stack is not seeing the executeFunction in it. How to do so? def executeFunction(x): try: x except: print('Exception caught') executeFunction(func1()) executeFunction(func2()) executeFunction(func3()) executeFunction(func4()) executeFunction(func5())

问题 After reading the with statement section of the language documentation of Python, I was wondering if it is correct to state that this Python code: with EXPRESSION as TARGET: SUITE is equivalent to this one: try: manager = (EXPRESSION) value = manager.__enter__() TARGET = value # only if `as TARGET` is present in the with statement SUITE except: import sys if not manager.__exit__(*sys.exc_info()): raise else: manager.__exit__(None, None, None) Edit The correct equivalent Python code (the real

问题 After reading the with statement section of the language documentation of Python, I was wondering if it is correct to state that this Python code: with EXPRESSION as TARGET: SUITE is equivalent to this one: try: manager = (EXPRESSION) value = manager.__enter__() TARGET = value # only if `as TARGET` is present in the with statement SUITE except: import sys if not manager.__exit__(*sys.exc_info()): raise else: manager.__exit__(None, None, None) Edit The correct equivalent Python code (the real

问题 The problem happens with code like this: #include <cstdlib> #include <iostream> #include <stdexcept> using namespace std; int main(int argc, char** argv) { try { throw runtime_error("Message"); } catch (exception e) { cout << e.what(); } return 0; } I expect Message to appear. But the result was std::exception . I thought the subclass virtual functions can be called from the superclass reference. How can fix that? 回答1: C++ makes an explicit distinction between reference and value copy. Use

问题 I am trying to troubleshoot the following message I get when trying to use the parApply function from the parallel package: Error in unserialize(node$con) : error reading from connection The following is a mockup of what I'm doing: c0<-makeCluster(16,outfile='');clusterEvalQ(c0,library(survival)); aa <- array(rexp(1e4),c(100,50,2)); bb<-parApply(c0,aa,1,function(ii) { oo<-try(summary(coxph(Surv(c(ii))~gl(2,50)))$coef[1,]); if(class(oo)[1]=='try-error') rep(NA,5) else oo }); ... except that it

问题 I'm developing a C++ DLL that allocate an array for the main application. The function return an error code and not the pointer to the new created array, so the address of the first member will be written in a parameter of the function. Example: int foo(int** arrayPtr) { int* array = new int[10]; *arrayPtr = array; return 0; } So, in the main I call the function that way: int* myArray; int ret; ret = foo(&myArray); Now myArray points to the new created array. QUESTION 1: Is there a better way

问题 I am actually having trouble with my program. Actually I study in school (11 grade- junior college) so please explain me in very simple language. I am developing a quiz, very basic school project and so the programs goes on like this.... I want the user to enter his/her choice, by inputting numbers from 1-4. I don't want the user to enter an alphabet, letter or special character or any other no. other than 1-4. I tried using try and catch but my program stops after throwing the exception. I