Finding files in a directory

I'm trying to write code that searches through a folder and retrieves the names of the files in the folder.

So far I have the following code. When I run it, I just keep getting the Usage portion of the code. Why does argc need to be equal to 2 for the code to not print the usage portion. Also, where in the code would I specify the name of the directory I want to search?

Code:

---

#define _WIN32_WINNT 0x0501

#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <strsafe.h>
#include <conio.h>

int _tmain(int argc, TCHAR *argv[])
{
  WIN32_FIND_DATA ffd;
  TCHAR szDir[MAX_PATH];
  size_t length_of_arg;
  HANDLE hFind = INVALID_HANDLE_VALUE;
  DWORD dwError=0;
 
  // If the directory is not specified as a command-line argument,
  // print usage.
       
  if(argc != 2)
  {
      _tprintf(TEXT("Usage: %s <dir>\n"), argv[0]);
      return (-1);
  }

  // Check that the input path plus 2 is not longer than MAX_PATH.

  StringCchLength(argv[1], MAX_PATH, &length_of_arg);

  if (length_of_arg > (MAX_PATH - 2))
  {
      _tprintf(TEXT("Directory path is too long.\n"));
      return (-1);
  }

        _tprintf (TEXT("Target directory is %s\n\n"), argv[1]);

  // Prepare string for use with FindFile functions.  First, copy the
  // string to a buffer, then append '\*' to the directory name.

  StringCchCopy (szDir, MAX_PATH, argv[1]);
  StringCchCat (szDir, MAX_PATH, TEXT("\\*"));

  // Find the first file in the directory.

  hFind = FindFirstFile(szDir, &ffd);

  if (INVALID_HANDLE_VALUE == hFind)
  {
      dwError = GetLastError();

      _tprintf (TEXT("FindFirstFile failed (%u)\n"), dwError);
      return dwError;
  }
  else
  {
      _tprintf (TEXT("First file: %s\n"), ffd.cFileName);
 
      // List all the other files in the directory.

      while (FindNextFile(hFind, &ffd) != 0)
      {
        _tprintf (TEXT(" Next file: %s\n"), ffd.cFileName);
      }
   
      dwError = GetLastError();
      if (dwError != ERROR_NO_MORE_FILES)
      {
        _tprintf (TEXT("FindNextFile error (%u)\n"), dwError);
        goto Cleanup;
      }
  }

Cleanup:
  FindClose(hFind);
  return dwError;
}

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The first argument of the command-line is the directory specification. You can specify that with "myprog somedir" if you use a command prompt to run your code, or if you use visual studio or similar, you need to set the command line argument somewhere in the project config settings - I find it much easier to use the command prompt, in 99% of the case.

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Mats