reading files in a folder

[sitha]

Hi All,
I want to read a several (2000) files in a folder. I did as follows,
class for Readdir,

class	Readdir
{
	private:
	string		dirName;
	
	public:
	Readdir ( const string& m) { dirName = m; }
	~Readdir() {}
		
	void	readFiles() const;
};

member function coding,

#include <dirent.h>
#include <errno.h>

void	Readdir::readFiles () const
{
		DIR* dirp;
		string 	buff;
		struct dirent* dp;
		dirp = opendir( dirName.c_str());
		if (!dirp)
		{
			cout<< "Error: failure opening directory! " << endl;
			exit(1);
		}
		
		errno = 0;
		
		ofstream output;
		output.open("driftdata/drift", ios::out);
		
		while((dp = readdir (dirp))!=NULL)
		{
			if(strstr (dp->d_name, ".dat"))
			{
				ifstream input(dp->d_name);
				int lineno=0;
				
				while(getline(input, buff))
				{
					if((++lineno%25)==5)
					{
						if(lineno ==4055) break;
						
						output<<buff<<endl;
					}
				}
			}
			if(errno)
			{
				cout << " Error :readdir () failure" << endl;
				exit(1);
			}
		}
	
	output.close();
	closedir (dirp);
	
}

main,

int main(void)
{
Readdir		myDir(".");
	
	myDir.readFiles();
return 0;
}

In this case, my coding is working in linux OS (gCC compiler). But I want to run the codes in Windows OS ( Visual Studio).
Please tell me how can I do the above task in Windows.
The main problem is <dirent.h> header file is available in windows.

Please suggest me a different way to read files in a folder.

Thanks a lot in advance.