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#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <tchar.h>

void RefreshDirectory(LPTSTR);
void RefreshTree(LPTSTR);

void WatchDirectory(LPTSTR lpDir)
{
   DWORD dwWaitStatus; 
   HANDLE dwChangeHandles[2]; 
   TCHAR lpDrive[4];
   TCHAR lpFile[_MAX_FNAME];
   TCHAR lpExt[_MAX_EXT];

   _tsplitpath(lpDir, lpDrive, NULL, lpFile, lpExt);

   lpDrive[2] = (TCHAR)'//';
   lpDrive[3] = (TCHAR)'/0';
 
// Watch the directory for file creation and deletion. 
 
   dwChangeHandles[0] = FindFirstChangeNotification( 
      lpDir,                         // directory to watch 
      FALSE,                         // do not watch subtree 
      FILE_NOTIFY_CHANGE_FILE_NAME); // watch file name changes 
 
   if (dwChangeHandles[0] == INVALID_HANDLE_VALUE) 
      ExitProcess(GetLastError()); 
 
// Watch the subtree for directory creation and deletion. 
 
   dwChangeHandles[1] = FindFirstChangeNotification( 
      lpDrive,                       // directory to watch 
      TRUE,                          // watch the subtree 
      FILE_NOTIFY_CHANGE_DIR_NAME);  // watch dir. name changes 
 
   if (dwChangeHandles[1] == INVALID_HANDLE_VALUE) 
      ExitProcess(GetLastError()); 
 
// Change notification is set. Now wait on both notification 
// handles and refresh accordingly. 
 
   while (TRUE) 
   { 
   // Wait for notification.
 
      dwWaitStatus = WaitForMultipleObjects(2, dwChangeHandles, 
         FALSE, INFINITE); 
 
      switch (dwWaitStatus) 
      { 
         case WAIT_OBJECT_0: 
 
         // A file was created or deleted in the directory.
         // Refresh this directory and restart the notification.
 
            RefreshDirectory(lpDir); 
            if ( FindNextChangeNotification( 
                    dwChangeHandles[0]) == FALSE ) 
                ExitProcess(GetLastError()); 
            break; 
 
         case WAIT_OBJECT_0 + 1: 
 
         // A directory was created or deleted in the subtree.
         // Refresh the tree and restart the notification.
 
            RefreshTree(lpDrive); 
            if (FindNextChangeNotification( 
                    dwChangeHandles[1]) == FALSE) 
                ExitProcess(GetLastError()); 
            break; 
 
        default: 
            ExitProcess(GetLastError()); 
      }
   }
}

void RefreshDirectory(LPTSTR lpDir)
{
   _tprintf(TEXT("Refresh the directory (%s)./n"), lpDir);
}

void RefreshTree(LPTSTR lpDrive)
{
   _tprintf(TEXT("Refresh the directory tree (%s)./n"), lpDrive);
}

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from msdn:
Monitoring Changes in a Directory or Directory Tree
The following example monitors the directory tree starting at C:/ for directory name changes. It also monitors the C:/WINDOWS directory for file name changes. 

The example uses the FindFirstChangeNotification function to create two notification handles and the WaitForMultipleObjects function to wait on the handles. Whenever a directory is created or deleted in the tree starting at C:/ , the example updates the entire directory tree. Whenever a file is created or deleted in the C:/WINDOWS directory, the example refreshes the WINDOWS directory. The FindNextChangeNotification function restarts the change notification each time the example processes a change. 

DWORD dwWaitStatus; 
HANDLE dwChangeHandles[2]; 
 
// Watch the C:/WINDOWS directory for file creation and 
// deletion. 
 
dwChangeHandles[0] = FindFirstChangeNotification( 
    "C://WINDOWS",                 // directory to watch 
    FALSE,                         // do not watch the subtree 
    FILE_NOTIFY_CHANGE_FILE_NAME); // watch file name changes 
 
if (dwChangeHandles[0] == INVALID_HANDLE_VALUE) 
    ExitProcess(GetLastError()); 
 
// Watch the C:/ subtree for directory creation and 
// deletion. 
 
dwChangeHandles[1] = FindFirstChangeNotification( 
    "C://",                        // directory to watch 
    TRUE,                          // watch the subtree 
    FILE_NOTIFY_CHANGE_DIR_NAME);  // watch dir. name changes 
 
if (dwChangeHandles[1] == INVALID_HANDLE_VALUE) 
    ExitProcess(GetLastError()); 
 
// Change notification is set. Now wait on both notification 
// handles and refresh accordingly. 
 
while (TRUE) 
{ 
 
    // Wait for notification.
 
    dwWaitStatus = WaitForMultipleObjects(2, dwChangeHandles, 
        FALSE, INFINITE); 
 
    switch (dwWaitStatus) 
    { 
        case WAIT_OBJECT_0: 
 
        // A file was created or deleted in C:/WINDOWS. 
        // Refresh this directory and restart the 
        // change notification. RefreshDirectory is an 
        // application-defined function. 
 
            RefreshDirectory("C://WINDOWS") 
            if ( FindNextChangeNotification( 
                    dwChangeHandles[0]) == FALSE ) 
                ExitProcess(GetLastError()); 
            break; 
 
        case WAIT_OBJECT_0 + 1: 
 
        // A directory was created or deleted in C:/. 
        // Refresh the directory tree and restart the 
        // change notification. RefreshTree is an 
        // application-defined function. 
 
            RefreshTree("C://"); 
            if (FindNextChangeNotification( 
                    dwChangeHandles[1]) == FALSE) 
                ExitProcess(GetLastError()); 
            break; 
 
        default: 
            ExitProcess(GetLastError()); 
    } 
}