Listing all findfirstfiles in Windows

#include <windows.h>#include <tchar.h> #include <stdio.h>#include <strsafe.h>#pragma comment(lib, "User32.lib")void DisplayErrorBox(LPTSTR lpszFunction);int _tmain(int argc, TCHAR *argv[]){   WIN32_FIND_DATA ffd;   LARGE_INTEGER filesize;   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("\nUsage: %s <directory name>\n"), argv[0]);      return (-1);   }   // Check that the input path plus 3 is not longer than MAX_PATH.   // Three characters are for the "\*" plus NULL appended below.   StringCchLength(argv[1], MAX_PATH, &length_of_arg);   if (length_of_arg > (MAX_PATH - 3))   {      _tprintf(TEXT("\nDirectory path is too long.\n"));      return (-1);   }   _tprintf(TEXT("\nTarget 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)    {      DisplayErrorBox(TEXT("FindFirstFile"));      return dwError;   }       // List all the files in the directory with some info about them.   do   {      if (ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)      {         _tprintf(TEXT("  %s   <DIR>\n"), ffd.cFileName);      }      else      {         filesize.LowPart = ffd.nFileSizeLow;         filesize.HighPart = ffd.nFileSizeHigh;         _tprintf(TEXT("  %s   %ld bytes\n"), ffd.cFileName, filesize.QuadPart);      }   }   while (FindNextFile(hFind, &ffd) != 0);    dwError = GetLastError();   if (dwError != ERROR_NO_MORE_FILES)    {      DisplayErrorBox(TEXT("FindFirstFile"));   }   FindClose(hFind);   return dwError;}void DisplayErrorBox(LPTSTR lpszFunction) {     // Retrieve the system error message for the last-error code    LPVOID lpMsgBuf;    LPVOID lpDisplayBuf;    DWORD dw = GetLastError();     FormatMessage(        FORMAT_MESSAGE_ALLOCATE_BUFFER |         FORMAT_MESSAGE_FROM_SYSTEM |        FORMAT_MESSAGE_IGNORE_INSERTS,        NULL,        dw,        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),        (LPTSTR) &lpMsgBuf,        0, NULL );    // Display the error message and clean up    lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT,         (lstrlen((LPCTSTR)lpMsgBuf)+lstrlen((LPCTSTR)lpszFunction)+40)*sizeof(TCHAR));     StringCchPrintf((LPTSTR)lpDisplayBuf,         LocalSize(lpDisplayBuf) / sizeof(TCHAR),        TEXT("%s failed with error %d: %s"),         lpszFunction, dw, lpMsgBuf);     MessageBox(NULL, (LPCTSTR)lpDisplayBuf, TEXT("Error"), MB_OK);     LocalFree(lpMsgBuf);    LocalFree(lpDisplayBuf);}