VC ++异常处理-应用程序仍然崩溃 [英] VC++ exception handling - app crashes anyway

问题描述

以下是我在学习C ++中的异常处理过程中（使用Visual Studio 2010编译器）编写的代码段。

Following is the code snippet I have written in the process of learning exception handling in C++(using visual studio 2010 compiler).

#include "stdafx.h"
#include <iostream>
using namespace std;
void multi_double() {

double first,second,product;
try{
cout << "Enter the first number\n";
cin >> first;
cout << "Enter the second number\n";
cin >> second;
product = first * second;
cout << product;
}
catch(...){cout << "Got an exceptional behaviour";}

}
void stud_age(){
int age;
try{
cout << "Enter student's age\n";
cin >> age;
if(age < 0)
    throw;
cout << endl <<age;
}
catch(...) {
    cout << "Caught here\n";
}
}
class Model{
public:
Model(){cout << "ctor\n";}
~Model(){cout << "dtor\n";}
};
int _tmain(int argc, _TCHAR* argv[]) {
//multi_double();
//stud_age();
int a;
try{
    Model obj;
    int *p = NULL;
    *p = 0;//expecting access violation exception

}
catch(...){
    cout << "caught an exception\n";
}
return 0;
}

将启用C ++异常设置为是 [/ EHsc]。
但是当我运行该应用程序时，它仍然仍然崩溃！带有以下信息：

Enable C++ exception is set to Yes[/EHsc]. But when I run the application,it is still crashing anyway ! with following information:

问题签名：
问题事件名称：APPCRASH
应用程序名称：DataTypeConversions.exe
应用程序版本：0.0。 0.0
应用程序时间戳：4ffd8c3d
故障模块名称：DataTypeConversions.exe
故障模块版本：0.0.0.0
故障模块时间戳：4ffd8c3d
异常代码：c0000005
异常偏移量：00001051

Problem signature: Problem Event Name: APPCRASH Application Name: DataTypeConversions.exe Application Version: 0.0.0.0 Application Timestamp: 4ffd8c3d Fault Module Name: DataTypeConversions.exe Fault Module Version: 0.0.0.0 Fault Module Timestamp: 4ffd8c3d Exception Code: c0000005 Exception Offset: 00001051

为什么控件不捕获块？！

Why is not control coming to catch block?!

推荐答案

访问冲突和所有其他类型的硬件异常在Windows中使用称为 C结构化异常处理（SEH）的机制进行处理。与基于Posix的系统中通常的signal（）/ sigaction（）机制相比，此方法最初旨在为C程序提供一种更加结构化的方式来处理异常。

Access Violations and all other kinds of hardware exceptions are handled in Windows using a mechanism called "C Structured Exception Handling (SEH)". This was originally designed to give C programs a more "structured" way to handle exceptions than the usual signal()/sigaction() mechanism in Posix based systems.

SEH异常 可以通过设置在SEH堆栈展开之前调用的转换函数集成到C ++异常系统中。新的翻译器功能仅引发C ++异常，并且可以证明C ++可以捕获错误！

SEH exceptions can be integrated into the C++ Exception system, by setting a translator function which is called before SEH stack unwinding takes place. The new translator function simply throws a C++ exception and, presto, C++ can catch the error!

有关所有详细信息，请参阅MSDN上的此文档：

See this Document from the MSDN for all the details:

http： //msdn.microsoft.com/de-de/library/5z4bw5h5(v=vs.80).aspx

这是一个工作示例：

#include <windows.h>
#include <iostream>
#include <eh.h>
// You need to enable the /EHa excpetion model to make this work.
// Go to 
// Project|Properties|C/C++|Code Generation|Enable C++ Exceptions
// and select "Yes with SEH Exceptions (/EHa)"

void trans_func( unsigned int u, EXCEPTION_POINTERS* pExp )
{
    // printf( "In trans_func.\n" );
    throw "Hardware exception encountered";
}

int main() 
{
    _set_se_translator(trans_func);
    try
    {
        int *p = NULL;
        *p = 0;//expecting access violation exception
    }
    catch(const char *s)
    {
        std::cout << "caught an exception:" << s << "\n";
    }
    return 0;
}

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