GetPath is a file I/O std::string code snippet to obtain the path of a certain full filename.

GetPath using the STL only


#include <string>

#include <cassert>



//From http://www.richelbilderbeek.nl/CppGetPath.htm

//Returns the path, without a trailing backslash '\'

const std::string GetPath(const std::string& fileName)

{

  #ifndef USE_WINDOWS

  const int endOfPathIndex = fileName.rfind("/",fileName.size());

  #else

  const int endOfPathIndex = fileName.rfind("\\",fileName.size());

  #endif

  assert(endOfPathIndex < static_cast<int>(fileName.size()));

  return fileName.substr(0,endOfPathIndex);

}



int main()

{

  //For non-Windows users

  assert(GetPath("/any_path/any_file.cpp")=="/any_path");

}

GetPath using Boost.Filesystem

This version is more elegant and portable.


#include <cassert>

#include <string>

#include <boost/filesystem.hpp>



//From http://www.richelbilderbeek.nl/CppGetPath.htm

const std::string GetPath(const std::string& filename)

{

  return boost::filesystem::path(filename).parent_path().string();

}



int main()

{

  assert(GetPath("/any_path/any_file.cpp")=="/any_path"); //non-Windows

}

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(C++) GetPath

GetPath using the STL only

GetPath using Boost.Filesystem