c++中有类似Java的吗

try {
    ...
}
catch (Throwable t) {
    ...
}

我试图调试Java/jni代码调用本机windows函数和虚拟机不断崩溃。本机代码在单元测试中表现良好,只有在通过jni调用时才会崩溃。一个通用的异常捕获机制将被证明是非常有用的。


当前回答

Can you run your JNI-using Java application from a console window (launch it from a java command line) to see if there is any report of what may have been detected before the JVM was crashed. When running directly as a Java window application, you may be missing messages that would appear if you ran from a console window instead. Secondly, can you stub your JNI DLL implementation to show that methods in your DLL are being entered from JNI, you are returning properly, etc? Just in case the problem is with an incorrect use of one of the JNI-interface methods from the C++ code, have you verified that some simple JNI examples compile and work with your setup? I'm thinking in particular of using the JNI-interface methods for converting parameters to native C++ formats and turning function results into Java types. It is useful to stub those to make sure that the data conversions are working and you are not going haywire in the COM-like calls into the JNI interface. There are other things to check, but it is hard to suggest any without knowing more about what your native Java methods are and what the JNI implementation of them is trying to do. It is not clear that catching an exception from the C++ code level is related to your problem. (You can use the JNI interface to rethrow the exception as a Java one, but it is not clear from what you provide that this is going to help.)

其他回答

嗯,如果你想捕获所有异常来创建一个小转储,例如…

有人做了Windows的工作。

参见http://www.codeproject.com/Articles/207464/Exception-Handling-in-Visual-Cplusplus 在这篇文章中,他解释了他如何发现如何捕获各种异常,并提供了有效的代码。

以下是你可以找到的清单:

 SEH exception
 terminate
 unexpected
 pure virtual method call
 invalid parameter
 new operator fault 
 SIGABR
 SIGFPE
 SIGILL
 SIGINT
 SIGSEGV
 SIGTERM
 Raised exception
C++ typed exception

以及用法: CCrashHandler ch; ch.SetProcessExceptionHandlers ();//为一个线程执行此操作 ch.SetThreadExceptionHandlers ();//每个thred

默认情况下,这会在当前目录(crashdump.dmp)中创建一个迷你转储。

对于无法正确调试使用JNI的程序的真正问题(或者在调试器下运行时不出现错误):

在这种情况下,在JNI调用(即所有本机方法都是私有的,类中的公共方法调用它们)周围添加Java包装器通常会有所帮助,这些包装器会做一些基本的完整性检查(检查所有“对象”都被释放,释放后“对象”没有被使用)或同步(将所有方法从一个DLL同步到单个对象实例)。让java包装器方法记录错误并抛出异常。

这通常有助于发现真正的错误(令人惊讶的是,这些错误主要出现在Java代码中,不遵守被调用函数的语义,导致一些讨厌的double-free或类似的情况),比尝试在本地调试器中调试大型并行Java程序更容易……

如果您知道原因,请将代码保存在可以避免该原因的包装器方法中。最好让你的包装器方法抛出异常,而不是你的JNI代码崩溃VM…

如果你正在寻找特定于windows的解决方案,那么有结构化异常处理: https://learn.microsoft.com/en-us/cpp/cpp/try-except-statement

代码如下所示

__try
{
   // code here may throw or make access violation
}
__except( EXCEPTION_EXECUTE_HANDLER )
{
    // after exception code here, e.g. log the error
}

它不仅可以捕获c++异常,还可以捕获访问违规或其他系统异常。

(在c++中)以可移植的方式捕获所有异常是不可能的。这是因为在c++上下文中,有些异常并不是异常。这包括除以零误差等。可以通过破解来获得在这些错误发生时抛出异常的能力,但这并不容易做到,当然也不容易以一种可移植的方式得到正确的处理。

如果你想捕获所有的STL异常,你可以这样做

try { ... } catch( const std::exception &e) { ... }

这将允许您使用e.what(),它将返回一个const char*,它可以告诉您有关异常本身的更多信息。这是与Java构造最相似的构造。

如果有人愚蠢地抛出一个不继承std::exception的异常,这将对您没有帮助。

Can you run your JNI-using Java application from a console window (launch it from a java command line) to see if there is any report of what may have been detected before the JVM was crashed. When running directly as a Java window application, you may be missing messages that would appear if you ran from a console window instead. Secondly, can you stub your JNI DLL implementation to show that methods in your DLL are being entered from JNI, you are returning properly, etc? Just in case the problem is with an incorrect use of one of the JNI-interface methods from the C++ code, have you verified that some simple JNI examples compile and work with your setup? I'm thinking in particular of using the JNI-interface methods for converting parameters to native C++ formats and turning function results into Java types. It is useful to stub those to make sure that the data conversions are working and you are not going haywire in the COM-like calls into the JNI interface. There are other things to check, but it is hard to suggest any without knowing more about what your native Java methods are and what the JNI implementation of them is trying to do. It is not clear that catching an exception from the C++ code level is related to your problem. (You can use the JNI interface to rethrow the exception as a Java one, but it is not clear from what you provide that this is going to help.)