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C ++捕获输出流

[英]C++ catch output stream

原文 2013-01-27 01:56:24 7 1 c++/ output/ stringstream

I have a c++ library that provides an object with complicated logic. 我有一个c ++库，可为对象提供复杂的逻辑。 So far, many objects print their output to std::cout when one single library command is executed. 到目前为止，执行一个库命令时，许多对象会将其输出打印到std::cout 。 I want to create a Qt GUI for this (output it in a text widget instead of console output), so std::cout has to be changed for something more flexible. 我想为此创建一个Qt GUI（在文本窗口小部件中输出而不是在控制台输出中），因此必须更改std::cout以获得更灵活的功能。 I have passed a reference to std::stringstream parameter to the main object (and it passes it down to lower objects) and replaced all "std::cout << " with "stream << " (stream is std::stringstream). 我已经将对std::stringstream参数的引用传递给了主要对象（并将其传递给较低的对象），并将所有“ std :: cout <<”替换为“ stream <<”（流是std :: stringstream）。

It doesn't work, because I lose most of the output. 它不起作用，因为我丢失了大部分输出。 When I want to fetch it from the stringstream, it's ridiculously small (just few characters). 当我想从字符串流中获取它时，它太小了（只有几个字符）。 It seems that if I do stream << var1 << var2 << var3 only var3 will be available. 看来，如果我执行stream << var1 << var2 << var3只有var3可用。

Don't know how to solve this problem. 不知道如何解决这个问题。 If I passed a reference to std::cout as the main object parameter, everything would be ok under console, but it'd not work for the GUI application (I guess I cannot fetch output from std::cout). 如果我将对std::cout的引用作为主要对象参数传递，则在控制台下一切正常，但不适用于GUI应用程序（我想我无法从std :: cout获取输出）。

Please tell me if I'm using streamstring in a bad way. 请告诉我是否以不好的方式使用了流字符串。 Or let me know if there is a better way to fetch the output (use something else instead of stringstream). 或者让我知道是否有更好的方法来获取输出（使用其他方法代替stringstream）。 Many thanks in advance. 提前谢谢了。