(C++) CopyFile

 

CopyFile is a file I/O code snippet to copy a file.

 

• Download the Qt Creator project 'CppCopyFile' (zip)

Technical facts

 

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• Console application

C++ standard:

• C++98

Compiler(s):

• G++ 4.9.2

Libraries used:

• STL: GNU ISO C++ Library, version 4.9.2

 

 

 

 

 

Qt project file: ./CppCopyFile/CppCopyFile.pro

 

---

include(../../ConsoleApplication.pri) #Or use the code below # QT += core # QT += gui # greaterThan(QT_MAJOR_VERSION, 4): QT += widgets # CONFIG   += console # CONFIG   -= app_bundle # TEMPLATE = app # CONFIG(release, debug|release) { #   DEFINES += NDEBUG NTRACE_BILDERBIKKEL # } # QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++ # unix { #   QMAKE_CXXFLAGS += -Werror # } include(../../Libraries/Boost.pri) #Or use the code below # win32 { #   INCLUDEPATH += \ #     ../../Libraries/boost_1_54_0 # } SOURCES += main.cpp

 

 

 

 

 

./CppCopyFile/main.cpp

 

---

#include <cassert> #include <fstream> #include <stdexcept> #ifdef BOOST_H #include <boost/filesystem.hpp> #endif #ifdef VCL_H #include <SysUtils.hpp> #endif ///Determines if a filename is a regular file ///From http://www.richelbilderbeek.nl/CppIsRegularFile.htm bool IsRegularFile(const std::string& filename) {   std::fstream f;   f.open(filename.c_str(),std::ios::in);   return f.is_open(); } //From http://www.richelbilderbeek.nl/CppCopyFile.htm void CopyFileStl(const std::string& fileNameFrom, const std::string& fileNameTo) {   assert(IsRegularFile(fileNameFrom));   if(IsRegularFile(fileNameTo))   {     throw std::logic_error("Cannot copy over an existing file");   }   std::ifstream in (fileNameFrom.c_str());   std::ofstream out(fileNameTo.c_str());   out << in.rdbuf();   out.close();   in.close(); } #ifdef BOOST_H //From http://www.richelbilderbeek.nl/CppCopyFile.htm void CopyFileBoost(const std::string& from, const std::string& to) {   assert(IsRegularFile(fileNameFrom));   //Boost will check if the copy is made over an existing file   boost::filesystem::copy_file(from,to); } #endif #ifdef VCL_H //From http://www.richelbilderbeek.nl/CppCopyFile.htm void CopyFileVcl(const std::string& from, const std::string& to, const bool failIfExists) {   //Use VCL its CopyFile   CopyFile("FileFrom.txt","FileTo.txt",failIfExists); } #endif int main(int, char* argv[]) {   const std::string tmp_filename = "temp.txt";   //Delete file (in case it exists)   std::remove(tmp_filename.c_str());   //Copy file   CopyFileStl(argv[0],tmp_filename);   assert(IsRegularFile(tmp_filename));   //Clean up temp file by deleting it   std::remove(tmp_filename.c_str()); }