复制文件在 C++ 中没有任何作用

Question

I'm a beginner in C++ and I'm trying to make a file manager used with commands. Everything was good except for the copy function.

#include <stdlib.h>
int main(int argc, char * argv[])
{
    system(*"copy \"" + argv[0] + *"\" \"C:/Users/doubl/Desktop\"");
}

There isn't an error when compiling and running, but it never actually transfers anything.

Is there a better way to do this? if not what am I doing wrong here?

Answer 1

A possible way to copy files in C++ is to learn then use some existing C++ library or framework, like Qt or POCO .

Another way is to use C++ std::string -s, documented here to build your command line.

Newer C++ standards have std::filesystem documented here .

Of course, you will spend days in reading documentation.

My recommendation is to read the documentation of your C++ compiler (eg GCC , that you might invoke as g++ -Wall -Wextra -g - all warnings and debug info). Then read the documentation of your debugger (eg GDB ).

You probably also want to read the documentation of your version control system (eg git ).

Notice that your code (even improved a bit) won't work on my computers (they all run Linux), since copy (as a program) does not exist on them. The near equivalent program is called /bin/cp part of GNU coreutils .

I heard that copy is a Windows specific program. It existed on MSDOS.

At last, some computers (eg RaspberryPi ) might be programmable in C++ and not even have any files.