Opening a zip file in C++ with XZIP

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C++

Visual-Studio

In my current project, I have to go to a certain user inputted directory, open that directory and read all the zip files in that directory which begin with W. I am trying to use the XZIP library for opening the ZIP files, but I am certainly doing something very wrong. I am confused whether to use UnzipItem or Openzip to open the zip file and parse through its contents. (The zip files each contain some .jpg files and I have to copy those files into another location, but that's the second part of the project)

Another major issue is the way I am calling Openzip. this is not the correct way to call the function, I would like to know the correct way to call it with respect to my code.

I would really appreciate some help, Thanks :)

Here is my code-

#include "StdAfx.h"
#include "src\XZip.h"
#include "src\XUnzip.h"
int main()
{
  std::ifstream fin;
  std::string dir, filepath;
  int num;
  DIR *dp;
  struct dirent *dirp;
  struct stat filestat;
  std::string filename;
  std::string userInput;
  std::cout <<"Input dir to get files from: ";
  getline( std::cin, dir );  // gets everything the user
  dp = opendir( dir.c_str() );
  if (dp == NULL) {
        std::cout << "Error opening " << dir << std::endl;
    }
  char test[2];
  while ((dirp = readdir( dp )) != NULL)
    {  // printf(" inside the directory ");
        filepath = dir+"/" + dirp->d_name;
        filename =dirp.d_name;
        test[0]=filename[0];
        test[1]='\0';
        if ( test[0]=='W')
        {   HZIP* z;
            DWORD File_name = std::strtoul(filename.c_str(), NULL, 16);
            OpenZip(z,0,File_name);
        }

  }
    return 0;
}