Question

I am trying to convert a file path which just have one slash to double slash as shown on the code below.
but it gives me the error shown at the end

    #include<algorithm>

    std::string file_path;
    using std::replace;
     while(fgets(fname_buffer,1024,flist))
   {
    token = strtok( fname_buffer," ,\t");
    file_size=atol(token);

    token = strtok(NULL, " ,\t"); 
   strncpy((char*)file_fp,token,32);
   file_fp[32]='\0';

    token = strtok(NULL, "\n");
    file_path=token;
    replace(file_path.begin(),file_path.end(),'\\',"\\\\");
    //file_path.replace(file_path.begin(),file_path.end(),'\\','\\\\');

error C2664: ‘std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::replace(unsigned int,unsigned int,const _Elem *,unsigned int)’ : cannot convert parameter 1 from ‘std::_String_iterator<_Elem,_Traits,_Alloc>’ to ‘unsigned int’

Answer 1

replace cannot replace one character '\\' with two characters "\\\\". The signature of the template method requires const T& for the last two parameters, but you are passing a string instead of a character.

Here is how you can do what you need:

int p = 0;
while ((p = file_path.find('\\', p)) != string::npos) {
    file_path.insert(p, "\\");
    p += 2;
}