fopen在c++已经由有iostream来取代，对于popen呢？ libexecstream正是这样一个库，它能够把运行的一个外部程序的输入、输出、错误当做一个iostream一样的对象来处理。-fopen in c++ by iostream has replaced it for popen? libexecstream is such a database, it is able to run an external program input, output, error as