文件监视_能用_但似乎不太完善

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <Windows.h>
#include <ShellAPI.h>
#include <ShlObj.h>
#include <ShTypes.h>

#define WM_USERDEF_FILECHANGED 0x1000

LRESULT CALLBACK WindowProc(HWND hWnd, int uMsg, WPARAM wParam, LPARAM lParam)
{
switch(uMsg)
{
case WM_KEYDOWN:
  if(wParam == VK_ESCAPE)
  {
   PostQuitMessage(0);
  }
  break;
case WM_USERDEF_FILECHANGED:
  switch(lParam)
  {
  case SHCNE_RENAMEITEM: MessageBoxA(0, "重命名文件", "提示", MB_OK); break;
  case SHCNE_CREATE: MessageBoxA(0, "建立文件", "提示", MB_OK); break;
  case SHCNE_DELETE: MessageBoxA(0, "删除文件", "提示", MB_OK); break;
  case SHCNE_MKDIR: MessageBoxA(0, "新建目录", "提示", MB_OK); break;
  case SHCNE_RMDIR: MessageBoxA(0, "删除目录", "提示", MB_OK); break;
  case SHCNE_MEDIAINSERTED: MessageBoxA(0, "插入可移动存储介质", "提示", MB_OK); break;
  case SHCNE_MEDIAREMOVED: MessageBoxA(0, "移去可移动存储介质", "提示", MB_OK); break;
  case SHCNE_DRIVEREMOVED: MessageBoxA(0, "移去驱动器", "提示", MB_OK); break;
  case SHCNE_DRIVEADD: MessageBoxA(0, "添加驱动器", "提示", MB_OK); break;
  case SHCNE_NETSHARE: MessageBoxA(0, "改变目录", "提示", MB_OK); break;
  case SHCNE_ATTRIBUTES: MessageBoxA(0, "改变文件目录属性", "提示", MB_OK); break;
  case SHCNE_UPDATEDIR: MessageBoxA(0, "更新目录", "提示", MB_OK); break;
  case SHCNE_UPDATEITEM: MessageBoxA(0, "更新文件", "提示", MB_OK); break;
  case SHCNE_SERVERDISCONNECT: MessageBoxA(0, "断开与服务器的连接", "提示", MB_OK); break;
  case SHCNE_UPDATEIMAGE: MessageBoxA(0, "SHCNE_UPDATEIMAGE", "提示", MB_OK); break;
  case SHCNE_DRIVEADDGUI: MessageBoxA(0, "SHCNE_DRIVEADDGUI", "提示", MB_OK); break;
  case SHCNE_RENAMEFOLDER: MessageBoxA(0, "重命名文件", "提示", MB_OK); break;
  case SHCNE_FREESPACE: MessageBoxA(0, "磁盘空间大小改变", "提示", MB_OK); break;
  case SHCNE_ASSOCCHANGED: MessageBoxA(0, "改变文件关联", "提示", MB_OK); break;
  }
  ShowWindow(hWnd, SW_HIDE);
  UpdateWindow(hWnd);
  break;
}
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}

int main()
{
//Register And Create Window
WNDCLASS wc;
ZeroMemory(&wc,sizeof(wc));
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wc.hCursor = LoadCursor(0, IDC_ARROW);
wc.hIcon = LoadIcon(0, IDI_APPLICATION);
wc.hInstance = 0;
wc.lpfnWndProc = (WNDPROC)WindowProc;
wc.lpszClassName = L"Music";
wc.lpszMenuName = NULL;
wc.style = CS_HREDRAW | CS_VREDRAW;
if(RegisterClassW(&wc) == 0) return 0;
HWND hWnd = CreateWindowW(wc.lpszClassName, L"文件监视", WS_OVERLAPPED, 633, 334, 100, 50, 0, 0, 0, 0);
if(hWnd == INVALID_HANDLE_VALUE) return 0;
ShowWindow(hWnd, SW_HIDE);
UpdateWindow(hWnd);

//监视文件
SHChangeNotifyEntry shEntry = {0};
shEntry.fRecursive = TRUE;
shEntry.pidl = 0;
ULONG g_ulNotifyId = SHChangeNotifyRegister( hWnd, SHCNRF_InterruptLevel | SHCNRF_ShellLevel, SHCNE_ALLEVENTS, WM_USERDEF_FILECHANGED, 1, &shEntry );
if(g_ulNotifyId == 0)
{
MessageBoxA(0, "Register failed!","ERROR",MB_OK|MB_ICONERROR);
return -1;
}

//Msg Looping
MSG msg;
ZeroMemory(&msg, sizeof(MSG));
while(msg.message != WM_QUIT)
{
  if(PeekMessageA(&msg, 0, 0, 0, PM_REMOVE))
  {
   TranslateMessage(&msg);
   DispatchMessageA(&msg);
  }
  else Sleep(200);
}

//解除监视
if(g_ulNotifyId != 0)
{
  SHChangeNotifyDeregister(g_ulNotifyId);
}

return 0;
}

//对于消息中wParam还不明白什么意思

//SHCNRF_InterruptLevel和SHCNRF_ShellLevel也不太理解