How to build a full path string (safely) from separate strings?

c++ qt filepath
sas4740 picture sas4740 · Jun 9, 2011 · Viewed 81.1k times · Source

Does C++ have any equivalent to python's function os.path.join? Basically, I'm looking for something that combines two (or more) parts of a file path so that you don't have to worry about making sure the two parts fit together perfectly. If it's in Qt, that would be cool too.

Basically I spent an hour debugging some code and at least part of it was because root + filename had to be root/ + filename, and I'm looking to avoid that in the future.

Answer

user405725 picture user405725 · Jun 9, 2011

Only as part of Boost.Filesystem library. Here is an example:

#include <iostream>
#include <boost/filesystem.hpp>

namespace fs = boost::filesystem;

int main ()
{
    fs::path dir ("/tmp");
    fs::path file ("foo.txt");
    fs::path full_path = dir / file;
    std::cout << full_path << std::endl;
    return 0;
}

Here is an example of compiling and running (platform specific):

$ g++ ./test.cpp -o test -lboost_filesystem -lboost_system
$ ./test 
/tmp/foo.txt

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