problem with a program that should copy a file

[merdasss]

HI PROGRAMMERS!

i want to write a simple code that take a copy of the file from address below

C:\Windows\System32\telnet.exe

and then paste it into user desktop

if u want to say the code below its not working!

  system("copy C:\\Windows\\System32\\telnet.exe c:\"); 

i told this on begginer part but it seems nobody can help this is the link to it

http://www.cplusplus.com/forum/beginner/183255/

please give me the whole code tnx u all!

[JLBorges]

#include <iostream>
#include <string>
#include <shlobj.h>

std::wstring path_to_known_folder( REFIID folder_id )
{
    std::wstring result ;
    wchar_t* path = nullptr ;
    if( SHGetKnownFolderPath( folder_id, 0, nullptr, &path ) == S_OK )
    {
        result = path ;
        CoTaskMemFree(path);
    }
    return result ;
}

bool copy_from_system32_to_desktop( std::wstring file_name )
{
    const std::wstring system32_path = path_to_known_folder( FOLDERID_System ) + L'\\' + file_name ;
    const std::wstring desktop_path = path_to_known_folder( FOLDERID_Desktop ) + L'\\' + file_name ;

    if( system32_path.empty() || desktop_path.empty() ) return false ;
    else return CopyFileW( system32_path.c_str(), desktop_path.c_str(), false ) ;
}

int main()
{
    if( !copy_from_system32_to_desktop( L"telnet.exe" ) ) std::cerr << "copy failed\n" ;
}