首页 \ 问答 \ 导致Abort的未捕获异常(Uncaught exception that causes Abort)

导致Abort的未捕获异常(Uncaught exception that causes Abort)

 我正在使用我自己的继承自std::exception的Exception类。 我很确定这个课程没问题，因为它一直在努力。 我试图从构造函数中抛出一个错误：  
DataBase::DataBase()
  : _result(NULL)
{
  mysql_init(&_mysql);
  mysql_options(&_mysql,MYSQL_READ_DEFAULT_GROUP,"option");
  if(!mysql_real_connect(&_mysql,"localhost","root","","keylogger",0,NULL,0))
    throw Exception(__LINE__ - 1, __FILE__, __FUNCTION__, "Can't connect to DB");
}
 
 这是我的try / catch块：  
int main(int, char **)
{
  //[...]

  Server server([...]); // DB is a private member in Server

  try
  {
    server.fdMonitor();
  }
  catch (Exception &e)
  {
    std::cout << "Error: in " << e.file() << ", " << "function " << e.function()
          << "(line " << e.line() << ") : " << std::endl
          << "\t" << e.what() << std::endl;
  }
  return (1);
}
 
 问题是没有捕获从我的数据库构造函数抛出的异常。 这是中止消息：  
 terminate called after throwing an instance of 'Exception'
     what(): Can't connect to DB
 Aborted
 
 有任何想法吗？ 提前致谢。 

I'm using my own Exception class that inherits from std::exception. I'm pretty sure the class is okay since it has always worked up until now. I'm trying to throw an error from a constructor: 
DataBase::DataBase()
  : _result(NULL)
{
  mysql_init(&_mysql);
  mysql_options(&_mysql,MYSQL_READ_DEFAULT_GROUP,"option");
  if(!mysql_real_connect(&_mysql,"localhost","root","","keylogger",0,NULL,0))
    throw Exception(__LINE__ - 1, __FILE__, __FUNCTION__, "Can't connect to DB");
}
 
Here is my try/catch block : 
int main(int, char **)
{
  //[...]

  Server server([...]); // DB is a private member in Server

  try
  {
    server.fdMonitor();
  }
  catch (Exception &e)
  {
    std::cout << "Error: in " << e.file() << ", " << "function " << e.function()
          << "(line " << e.line() << ") : " << std::endl
          << "\t" << e.what() << std::endl;
  }
  return (1);
}
 
The problem is that the Exception thrown from my DB constructor isn't caught. Here's the abort message: 
 terminate called after throwing an instance of 'Exception'
     what(): Can't connect to DB
 Aborted
 
Any ideas? Thanks in advance.

原文：https://stackoverflow.com/questions/26777250

更新时间：2023-04-04 13:04

最满意答案

 在这种情况下，以下情况属实：  
 num1将等于索引的任何值，乘以它自己。 因此，当i从0开始运行时，它将在0,1,2,3和4上运行，直到它小于或等于4。  
 因此，num1将是：  
1) 0 * 0 = 0
2) 1 * 1 = 1
3) 2 * 2 = 4
4) 3 * 3 = 9
5) 4 * 4 = 16
 
 然后num2只计算每个的总和，即：  
0 + 1 + 4 + 9 + 16 = 30
 
 这将被分解为：  
Before for loop:
num2 = 0

1) num2 = 0 + 0 = 0
2) num2 = 0 + 1 = 1
3) num2 = 1 + 4 = 5
4) num2 = 5 + 9 = 14
5) num2 = 14 + 16 = 30
 
 它通过添加到目前为止的总数为num1来实现这一点。  
 希望这能澄清一点。  
 编辑：  
 正如sharonbn所提到的，var不是java中的有效类型，它应该是'int'。  
 此外，你有：  
int num2 = 0:
 
 在这里你以冒号结尾（:)这应该是一个分号（;）。 

In this case, the following is true: 
num1 will be equal to whatever the index is, multiplied by itself. Therefore this will run on 0, 1, 2, 3 and 4 as your i starts as 0 and runs until it is less than or equal to 4. 
Therefore, num1 will be: 
1) 0 * 0 = 0
2) 1 * 1 = 1
3) 2 * 2 = 4
4) 3 * 3 = 9
5) 4 * 4 = 16
 
Then num2 simply calculates the sum of each of these, which would be: 
0 + 1 + 4 + 9 + 16 = 30
 
This would be broken up into: 
Before for loop:
num2 = 0

1) num2 = 0 + 0 = 0
2) num2 = 0 + 1 = 1
3) num2 = 1 + 4 = 5
4) num2 = 5 + 9 = 14
5) num2 = 14 + 16 = 30
 
It does this by adding whatever num1 was to the total so far. 
Hope this clarifes it a bit. 
EDIT: 
As sharonbn has mentioned, var is not a valid type in java, this should be 'int'. 
Also, you have: 
int num2 = 0:
 
Here you have ended with a colon (:) this should be a semi-colon (;).

导致Abort的未捕获异常(Uncaught exception that causes Abort)

最满意答案

相关问答

跟踪嵌套的java for循环(Tracing a Nested java for loop)[2021-07-24]

进程互相跟踪(Processes tracing each other)[2023-03-01]

跟踪简单的递归函数(Tracing simple recursive function)[2022-01-24]

在程序集中跟踪一个简单的程序(Tracing a simple program in assembly)[2023-08-09]

2D光线追踪(2D optical ray tracing)[2022-09-18]

简单的循环(Simple for loop)[2023-06-02]

简单的喷油器追踪时间(Simple Injector tracing times)[2022-04-08]

问：简单的循环跟踪(Q: Simple Loop Tracing)[2023-03-29]

如何检测Python AST以跟踪商店运营？(How to instrument Python AST for tracing store operations?)[2021-07-27]

简单的光线追踪教程？(Simple ray tracing tutorial?)[2023-09-28]

相关文章

最新问答