异常处理在Windows上不能与Qt一起使用 [英] Exception handling doesn't work with Qt on Windows

问题描述

我面临着奇怪的问题。也就是说，Qt以某种方式关闭我的程序中的异常处理。我不能捕获任何异常，当我抛出异常应用程序崩溃。

I'm facing strange problem. Namely, Qt somehow turns off exception handling in my program. I can't catch any exception, and when I throw an exception application crashes.

我使用来自Qt SDK v2010.05的Qt 4.7.0（32位）在Windows 7（64位），g ++（GCC）4.5.1从MinGW ，NetBeans 6.9.1。
但是我也用g ++ 3.4.5（也来自MinGW）和Qt Creator 2.0.1 - 这个奇怪的行为。

I'm using Qt 4.7.0 (32 bit) from Qt SDK v2010.05 on Windows 7 (64 bit), g++ (GCC) 4.5.1 from MinGW, NetBeans 6.9.1. But I also cheked this with g++ 3.4.5 (also from MinGW) and Qt Creator 2.0.1 - same strange behavior.

例如（最简单的case ）：

For example (simplest case):

#include <Qt/QApplication.h>
#include <iostream>
#include <stdexcept>
#include <cstdlib>

using namespace std;


int main(int argc, char* argv[]) {
    QApplication app(argc, argv);

    try {
        cout << "Before exception" << endl;
        throw runtime_error("Exception occured");
        cout << "After exception" << endl;
    } catch (runtime_error& exc) {
        cout << exc.what() << endl;
        exit(1);
    }

    return 0;
}

当我执行上面的程序时，我得到这个输出：

When I execute above program I've got this output:

例外之前

Before exception

此应用程序已请求运行时以异常方式终止它。 br>
请与应用程序的支持小组联系以获取更多信息。

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

我试图添加标志-fexceptions

I've tried to add flag "-fexceptions" to g++ but it hasn't changed anything.

当我不使用Qt时，一切正常：

When I don't use Qt, everything is OK:

#include <Qt/QApplication.h> // It is not caused only by including Qt header
                             // so it doesn't matter if I comment this out or not
#include <iostream>
#include <stdexcept>
#include <cstdlib>

using namespace std;


int main(int argc, char* argv[]) {
    // QApplication app(argc, argv);

    try {
        cout << "Before exception" << endl;
        throw runtime_error("Exception occured");
        cout << "After exception" << endl;
    } catch (runtime_error& exc) {
        cout << exc.what() << endl;
        exit(1);
    }

    return 0;
}

输出：

异常之前

异常发生

Before exception
Exception occured

有人知道为什么会发生这种情况那种方式和如何解决这个问题？是否与Qt构建时使用的异常处理方法类型（SJLJ或Dwarf-2）有关？

Does anybody know why is this happen that way and how to fix this? Has it something to do with type of exception handling method (SJLJ or Dwarf-2) used when Qt was build?

推荐答案

'res reconfigured and recompiled Qt with flag -exceptions ：

D：\Qt\2010.05\qt> mingw32 -make confclean&& configure -exceptions&&& mingw32-make

现在一切正常！

I've reconfigured and recompiled Qt with flag -exceptions:
D:\Qt\2010.05\qt>mingw32-make confclean && configure -exceptions && mingw32-make
and now everything is ok!

感谢所有人的帮助，特别是对Nick D！

Thanks all for help, especially to Nick D!

反正很奇怪，我有Qt build没有这个标志。我从官方网站下载了二进制形式的Qt SDK。

Anyway, it's very strange that I had Qt build without this flag. I had downloaded Qt SDK in binary form from official site.

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