重定向输出一个函数打印到控制台到字符串 [英] redirect output of an function printing to console to string
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问题描述
让我们说,我们有一个函数,它打印文本到控制台,我们不能控制源,但我们能够调用它。例如
lets say we have a function which prints text to the console and in which we do not have control over the source but we are able to call it. For example
void foo() {
std::cout<<"hello world"<<std::endl;
print_to_console(); // this could be printed from anything
}
上面的函数到一个字符串,而不改变函数本身?
is it possible to redirect the output of the above function to a string without changing the function itself?
我不是在寻找一个办法通过终端
I'm not looking for a way to do this via terminal
推荐答案
是的。这可以做到。下面是一个小演示:
Yes. That can be done. Here is a little demo:
#include <sstream>
#include <iostream>
void print_to_console() {
std::cout << "Hello from print_to_console()" << std::endl;
}
void foo(){
std::cout<<"hello world"<<std::endl;
print_to_console(); // this could be printed from anything
}
int main()
{
std::stringstream ss;
//change the underlying buffer and save the old buffer
auto old_buf = std::cout.rdbuf(ss.rdbuf());
foo(); //all the std::cout goes to ss
std::cout.rdbuf(old_buf); //reset
std::cout << "<redirected-output>\n"
<< ss.str()
<< "</redirected-output>" << std::endl;
}
输出:
<redirected-output>
hello world
Hello from print_to_console()
</redirected-output>
查看在线演示。
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