blocks|key|2209016|text|如果它是从std::exception派生的，你可以通过引用来捕获：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2209017|try
{
++++//+code+that+could+cause+exception
}
catch+(const+std::exception+&exc)
{
++++//+catch+anything+thrown+within+try+block+that+derives+from+std::exception
++++std::cerr+<<+exc.what();
}|code-block|syntax|javascript|2209018|但是如果异常是某个不是从std::exception派生的类，那么您必须提前知道它的类型(即您应该捕获std::string或some_library_exception_base)。|2209019|您可以执行“全部捕获”：|2209020|try
{
}
catch+(...)
{
}|2209021|但是，你不能对异常做任何事情。|2209022|entityMap^0|5|E|0|0|C|E|1F|B|1R|R|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|15|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|Q|3|R|5|6|7|17|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|T|$]]

If it derives from <code>std::exception</code> you can catch by reference:

<pre><code>try
{
 // code that could cause exception
}
catch (const std::exception &amp;exc)
{
 // catch anything thrown within try block that derives from std::exception
 std::cerr &lt;&lt; exc.what();
}
</code></pre>

But if the exception is some class that has is not derived from <code>std::exception</code>, you will have to know ahead of time it's type (i.e. should you catch <code>std::string</code> or <code>some_library_exception_base</code>).

You can do a catch all:

<pre><code>try
{
}
catch (...)
{
}
</code></pre>

but then you can't do anything with the exception.

blocks|key|623269|text|在C%2B%2B11中有：std::current_exception|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|623270|来自站点的示例代码：|623271|#include+<iostream>
#include+<string>
#include+<exception>
#include+<stdexcept>

void+handle_eptr(std::exception_ptr+eptr)+//+passing+by+value+is+ok
{
++++try+{
++++++++if+(eptr)+{
++++++++++++std::rethrow_exception(eptr);
++++++++}
++++}+catch(const+std::exception&+e)+{
++++++++std::cout+<<+"Caught+exception+\""+<<+e.what()+<<+"\"\n";
++++}
}

int+main()
{
++++std::exception_ptr+eptr;
++++try+{
++++++++std::string().at(1);+//+this+generates+an+std::out_of_range
++++}+catch(...)+{
++++++++eptr+=+std::current_exception();+//+capture
++++}
++++handle_eptr(eptr);
}+//+destructor+for+std::out_of_range+called+here,+when+the+eptr+is+destructed|code-block|syntax|javascript|623272|entityMap|0|LINK|mutability|MUTABLE|url|http://en.cppreference.com/w/cpp/error/current_exception^0|9|M|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

In C++11 you have: <a href="http://en.cppreference.com/w/cpp/error/current_exception" rel="noreferrer">std::current_exception</a>

Example code from site:

<pre><code>#include &lt;iostream&gt;
#include &lt;string&gt;
#include &lt;exception&gt;
#include &lt;stdexcept&gt;

void handle_eptr(std::exception_ptr eptr) // passing by value is ok
{
 try {
 if (eptr) {
 std::rethrow_exception(eptr);
 }
 } catch(const std::exception&amp; e) {
 std::cout &lt;&lt; "Caught exception \"" &lt;&lt; e.what() &lt;&lt; "\"\n";
 }
}

int main()
{
 std::exception_ptr eptr;
 try {
 std::string().at(1); // this generates an std::out_of_range
 } catch(...) {
 eptr = std::current_exception(); // capture
 }
 handle_eptr(eptr);
} // destructor for std::out_of_range called here, when the eptr is destructed
</code></pre>

blocks|key|3616237|text|如果您使用ABI来表示gcc或CLANG，则可以知道未知的异常类型。但这是一个非标准的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3616238|查看此处https://stackoverflow.com/a/24997351/1859469|offset|length|3616239|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/24997351/1859469^0|0|4|18|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

If you use ABI for gcc or CLANG you can know the unknown exception type. But it is non standard solution.

See here
<a href="https://stackoverflow.com/a/24997351/1859469">https://stackoverflow.com/a/24997351/1859469</a>

blocks|key|1366046|text|先按照R+Samuel+Klatchko的建议进行尝试。如果这还不起作用，还有其他东西可能会有帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1366047|a)如果调试器支持，则在异常类型(已处理或未处理)上放置断点。|1366048|b)在某些系统上，编译器生成对(无文档？)在执行throw语句时调用。要找出您的系统使用的是什么函数，可以编写一个简单的hello+world程序，该程序抛出并捕获一个异常。启动调试器并在异常构造函数中放置断点，然后查看从何处调用该断点。缩放函数可能类似于__throw()。然后，使用要作为被调试者调查的程序再次启动调试器。在上面提到的函数(__throw或其他任何函数)上放置断点，然后运行程序。当抛出异常时，调试器将停止，您将立即找到原因。|1366049|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Try as suggested by R Samuel Klatchko first. If that doesn't help, there's something else that might help:

a) Place a breakpoint on the exception type (handled or unhandled) if your debugger supports it.

b) On some systems, the compiler generates a call to an (undocumented?) function when a throw statement is executed. to find out, what function that is for your system, write a simple hello world program, that throws and catches an exception. start a debugger and place a breakpoint in the exceptions constructor, and see from where it is being called. the caling function is probably something like __throw(). afterwards, start the debugger again with the program you want to investigate as debuggee. place breakpoint on the function mentioned above (__throw or whatever) and run the program. when the exception is thrown, the debugger stops and you are right there to find out why.

blocks|key|621207|text|受Dawid+Drozd的启发回答：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|621208|#include+<exception>
try
{
++++//+The+code+that+could+throw
}
catch(...)
{
++++auto+expPtr+=+std::current_exception();

++++try
++++{
++++++++if(expPtr)+std::rethrow_exception(expPtr);
++++}
++++catch(const+std::exception&+e)+//it+would+not+work+if+you+pass+by+value
++++{
++++++++std::cout+<<+e.what();
++++}
}|code-block|syntax|javascript|621209|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Inspired by Dawid Drozd answer:

<pre><code>#include &lt;exception&gt;
try
{
 // The code that could throw
}
catch(...)
{
 auto expPtr = std::current_exception();

 try
 {
 if(expPtr) std::rethrow_exception(expPtr);
 }
 catch(const std::exception&amp; e) //it would not work if you pass by value
 {
 std::cout &lt;&lt; e.what();
 }
}
</code></pre>

blocks|key|2209163|text|灵感来自hamaney的回答：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2209164|#include+<iostream>
#include+<string>
#include+<exception>
#include+<stdexcept>

int+main()
{
+++try
+++{+
++++++//+Your+code
+++}
+++catch+(...)
+++{
++++++try
++++++{
+++++++++std::exception_ptr+curr_excp;
+++++++++if+(curr_excp+=+std::current_exception())
+++++++++{
++++++++++++std::rethrow_exception(curr_excp);
+++++++++}
++++++}
++++++catch+(const+std::exception&+e)
++++++{
+++++++++std::cout+<<+e.what();
++++++}
+++}
}|code-block|syntax|javascript|2209165|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Inspired by hamaney answer:

<pre><code>#include &lt;iostream&gt;
#include &lt;string&gt;
#include &lt;exception&gt;
#include &lt;stdexcept&gt;

int main()
{
 try
 { 
 // Your code
 }
 catch (...)
 {
 try
 {
 std::exception_ptr curr_excp;
 if (curr_excp = std::current_exception())
 {
 std::rethrow_exception(curr_excp);
 }
 }
 catch (const std::exception&amp; e)
 {
 std::cout &lt;&lt; e.what();
 }
 }
}
</code></pre>

I have some program and everytime I run it, it throws exception and I don't know how to check what exactly it throws, so my question is, is it possible to catch exception and print it (I found rows which throws exception) thanks in advance

how to catch unknown exception and print it

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一些程序，每次我运行它时，它都会抛出异常，我不知道如何检查它到底抛出了什么，所以我的问题是，是否可以捕获异常并打印它(我发现了抛出异常的行)，谢谢提前

问如何捕获未知异常并打印出来
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回答 6

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