我的示例應用越來越崩潰，註冊到Filechangeinfo通知

Question

public partial class Form1 : Form 
{ 
    [DllImport("coredll.dll")] 
    static extern int SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong); 

    [DllImport("coredll.dll")] 
    static extern IntPtr CallWindowProc(IntPtr lpPrevWndFunc, IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam); 

    [DllImport("coredll.dll")] 
    public static extern IntPtr GetWindowLong(IntPtr hWnd, int nIndex); 


    //public struct tagSHCHANGENOTIFYENTRY 
    //{ 
    // [MarshalAs(UnmanagedType.SysUInt)] 
    // public ulong dwEventMask; 

    // [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4096)] 
    // public string WatchDir; 

    // [MarshalAs(UnmanagedType.Bool)] 
    // public bool fRecursive; 
    //} 
    //tagSHCHANGENOTIFYENTRY test; 

    //[DllImport("aygshell.dll")] 
    //static extern bool SHChangeNotifyRegister(IntPtr hwnd, ref tagSHCHANGENOTIFYENTRY test); 

    const int GWL_WNDPROC = -4; 

    public delegate int WindProc(IntPtr hWnd, int msg, IntPtr Wparam, IntPtr lparam); 

    static private WindProc SampleProc; 
    IntPtr OldDefProc = IntPtr.Zero; 

    public enum SHCNE : uint 
    { 
     SHCNE_RENAMEITEM = 0x00000001, 
     SHCNE_CREATE = 0x00000002, 
     SHCNE_DELETE = 0x00000004, 
     SHCNE_MKDIR = 0x00000008, 
     SHCNE_RMDIR = 0x00000010, 
     SHCNE_MEDIAINSERTED = 0x00000020, 
     SHCNE_MEDIAREMOVED = 0x00000040, 
     SHCNE_DRIVEREMOVED = 0x00000080, 
     SHCNE_DRIVEADD = 0x00000100, 
     SHCNE_NETSHARE = 0x00000200, 
     SHCNE_NETUNSHARE = 0x00000400, 
     SHCNE_ATTRIBUTES = 0x00000800, 
     SHCNE_UPDATEDIR = 0x00001000, 
     SHCNE_UPDATEITEM = 0x00002000, 
     SHCNE_SERVERDISCONNECT = 0x00004000, 
     SHCNE_UPDATEIMAGE = 0x00008000, 
     SHCNE_DRIVEADDGUI = 0x00010000, 
     SHCNE_RENAMEFOLDER = 0x00020000, 
     SHCNE_FREESPACE = 0x00040000, 
     SHCNE_EXTENDED_EVENT = 0x04000000, 
     SHCNE_ASSOCCHANGED = 0x08000000, 
     SHCNE_DISKEVENTS = 0x0002381F, 
     SHCNE_GLOBALEVENTS = 0x0C0581E0, 
     SHCNE_ALLEVENTS = 0x7FFFFFFF, 
     SHCNE_INTERRUPT = 0x80000000, 
    } 

    public enum SHCNF 
    { 
     SHCNF_IDLIST = 0x0000, 
     SHCNF_PATHA = 0x0001, 
     SHCNF_PRINTERA = 0x0002, 
     SHCNF_DWORD = 0x0003, 
     SHCNF_PATHW = 0x0005, 
     SHCNF_PRINTERW = 0x0006, 
     SHCNF_TYPE = 0x00FF, 
     SHCNF_FLUSH = 0x1000, 
     SHCNF_FLUSHNOWAIT = 0x2000 
    } 

    public const uint WM_SHNOTIFY = 0x0401; 

    private const int WM_FILECHANGEINFO = (0x8000 + 0x101); 

    public struct SHChangeNotifyEntry 
    { 
     public IntPtr pIdl; 
     [MarshalAs(UnmanagedType.Bool)] 
     public Boolean Recursively; 
    } 



    [DllImport("coredll.dll", EntryPoint = "#2", CharSet = CharSet.Auto)] 
    private static extern uint SHChangeNotifyRegister(
     IntPtr hWnd, 
     SHCNF fSources, 
     SHCNE fEvents, 
     uint wMsg, 
     int cEntries, 
     ref SHChangeNotifyEntry pFsne); 

    [DllImport("Ceshell.dll", CharSet = CharSet.Auto)] 
    private static extern uint SHGetSpecialFolderLocation(
     IntPtr hWnd, 
     CSIDL nFolder, 
     out IntPtr Pidl); 

    public enum CSIDL 
    { 
     /// <summary> 
     /// Desktop 
     /// </summary> 
     CSIDL_DESKTOP = 0x0000, 
     /// <summary> 
     /// Internet Explorer (icon on desktop) 
     /// </summary> 
     CSIDL_INTERNET = 0x0001, 
     /// <summary> 
     /// Start Menu\Programs 
     /// </summary> 
     CSIDL_PROGRAMS = 0x0002, 
     /// <summary> 
     /// My Computer\Control Panel 
     /// </summary> 
     CSIDL_CONTROLS = 0x0003, 
     /// <summary> 
     /// My Computer\Printers 
     /// </summary> 
     CSIDL_PRINTERS = 0x0004, 
     /// <summary> 
     /// My Documents 
     /// </summary> 
     CSIDL_PERSONAL = 0x0005, 
     /// <summary> 
     /// user name\Favorites 
     /// </summary> 
     CSIDL_FAVORITES = 0x0006, 
     /// <summary> 
     /// Start Menu\Programs\Startup 
     /// </summary> 
     CSIDL_STARTUP = 0x0007, 
     /// <summary> 
     /// user name\Recent 
     /// </summary> 
     CSIDL_RECENT = 0x0008, 
     /// <summary> 
     /// user name\SendTo 
     /// </summary> 
     CSIDL_SENDTO = 0x0009, 
     /// <summary> 
     /// desktop\Recycle Bin 
     /// </summary> 
     CSIDL_BITBUCKET = 0x000a, 
     /// <summary> 
     /// user name\Start Menu 
     /// </summary> 
     CSIDL_STARTMENU = 0x000b, 
     /// <summary> 
     /// logical "My Documents" desktop icon 
     /// </summary> 
     CSIDL_MYDOCUMENTS = 0x000c, 
     /// <summary> 
     /// "My Music" folder 
     /// </summary> 
     CSIDL_MYMUSIC = 0x000d, 
     /// <summary> 
     /// "My Videos" folder 
     /// </summary> 
     CSIDL_MYVIDEO = 0x000e, 
     /// <summary> 
     /// user name\Desktop 
     /// </summary> 
     CSIDL_DESKTOPDIRECTORY = 0x0010, 
     /// <summary> 
     /// My Computer 
     /// </summary> 
     CSIDL_DRIVES = 0x0011, 
     /// <summary> 
     /// Network Neighborhood (My Network Places) 
     /// </summary> 
     CSIDL_NETWORK = 0x0012, 
     /// <summary> 
     /// user name>nethood 
     /// </summary> 
     CSIDL_NETHOOD = 0x0013, 
     /// <summary> 
     /// windows\fonts 
     /// </summary> 
     CSIDL_FONTS = 0x0014, 
     CSIDL_TEMPLATES = 0x0015, 
     /// <summary> 
     /// All Users\Start Menu 
     /// </summary> 
     CSIDL_COMMON_STARTMENU = 0x0016, 
     /// <summary> 
     /// All Users\Start Menu\Programs 
     /// </summary> 
     CSIDL_COMMON_PROGRAMS = 0X0017, 
     /// <summary> 
     /// All Users\Startup 
     /// </summary> 
     CSIDL_COMMON_STARTUP = 0x0018, 
     /// <summary> 
     /// All Users\Desktop 
     /// </summary> 
     CSIDL_COMMON_DESKTOPDIRECTORY = 0x0019, 
     /// <summary> 
     /// user name\Application Data 
     /// </summary> 
     CSIDL_APPDATA = 0x001a, 
     /// <summary> 
     /// user name\PrintHood 
     /// </summary> 
     CSIDL_PRINTHOOD = 0x001b, 
     /// <summary> 
     /// user name\Local Settings\Applicaiton Data (non roaming) 
     /// </summary> 
     CSIDL_LOCAL_APPDATA = 0x001c, 
     /// <summary> 
     /// non localized startup 
     /// </summary> 
     CSIDL_ALTSTARTUP = 0x001d, 
     /// <summary> 
     /// non localized common startup 
     /// </summary> 
     CSIDL_COMMON_ALTSTARTUP = 0x001e, 
     CSIDL_COMMON_FAVORITES = 0x001f, 
     CSIDL_INTERNET_CACHE = 0x0020, 
     CSIDL_COOKIES = 0x0021, 
     CSIDL_HISTORY = 0x0022, 
     /// <summary> 
     /// All Users\Application Data 
     /// </summary> 
     CSIDL_COMMON_APPDATA = 0x0023, 
     /// <summary> 
     /// GetWindowsDirectory() 
     /// </summary> 
     CSIDL_WINDOWS = 0x0024, 
     /// <summary> 
     /// GetSystemDirectory() 
     /// </summary> 
     CSIDL_SYSTEM = 0x0025, 
     /// <summary> 
     /// C:\Program Files 
     /// </summary> 
     CSIDL_PROGRAM_FILES = 0x0026, 
     /// <summary> 
     /// C:\Program Files\My Pictures 
     /// </summary> 
     CSIDL_MYPICTURES = 0x0027, 
     /// <summary> 
     /// USERPROFILE 
     /// </summary> 
     CSIDL_PROFILE = 0x0028, 
     /// <summary> 
     /// x86 system directory on RISC 
     /// </summary> 
     CSIDL_SYSTEMX86 = 0x0029, 
     /// <summary> 
     /// x86 C:\Program Files on RISC 
     /// </summary> 
     CSIDL_PROGRAM_FILESX86 = 0x002a, 
     /// <summary> 
     /// C:\Program Files\Common 
     /// </summary> 
     CSIDL_PROGRAM_FILES_COMMON = 0x002b, 
     /// <summary> 
     /// x86 Program Files\Common on RISC 
     /// </summary> 
     CSIDL_PROGRAM_FILES_COMMONX86 = 0x002c, 
     /// <summary> 
     /// All Users\Templates 
     /// </summary> 
     CSIDL_COMMON_TEMPLATES = 0x002d, 
     /// <summary> 
     /// All Users\Documents 
     /// </summary> 
     CSIDL_COMMON_DOCUMENTS = 0x002e, 
     /// <summary> 
     /// All Users\Start Menu\Programs\Administrative Tools 
     /// </summary> 
     CSIDL_COMMON_ADMINTOOLS = 0x002f, 
     /// <summary> 
     /// user name\Start Menu\Programs\Administrative Tools 
     /// </summary> 
     CSIDL_ADMINTOOLS = 0x0030, 
     /// <summary> 
     /// Network and Dial-up Connections 
     /// </summary> 
     CSIDL_CONNECTIONS = 0x0031, 
     /// <summary> 
     /// All Users\My Music 
     /// </summary> 
     CSIDL_COMMON_MUSIC = 0x0035, 
     /// <summary> 
     /// All Users\My Pictures 
     /// </summary> 
     CSIDL_COMMON_PICTURES = 0x0036, 
     /// <summary> 
     /// All Users\My Video 
     /// </summary> 
     CSIDL_COMMON_VIDEO = 0x0037, 
     /// <summary> 
     /// Resource Direcotry 
     /// </summary> 
     CSIDL_RESOURCES = 0x0038, 
     /// <summary> 
     /// Localized Resource Direcotry 
     /// </summary> 
     CSIDL_RESOURCES_LOCALIZED = 0x0039, 
     /// <summary> 
     /// Links to All Users OEM specific apps 
     /// </summary> 
     CSIDL_COMMON_OEM_LINKS = 0x003a, 
     /// <summary> 
     /// USERPROFILE\Local Settings\Application Data\Microsoft\CD Burning 
     /// </summary> 
     CSIDL_CDBURN_AREA = 0x003b, 
     /// <summary> 
     /// Computers Near Me (computered from Workgroup membership) 
     /// </summary> 
     CSIDL_COMPUTERSNEARME = 0x003d, 
     /// <summary> 
     /// combine with CSIDL_ value to force folder creation in SHGetFolderPath() 
     /// </summary> 
     CSIDL_FLAG_CREATE = 0x8000, 
     /// <summary> 
     /// combine with CSIDL_ value to return an unverified folder path 
     /// </summary> 
     CSIDL_FLAG_DONT_VERIFY = 0x4000, 
     /// <summary> 
     /// combine with CSIDL_ value to insure non-alias versions of the pidl 
     /// </summary> 
     CSIDL_FLAG_NO_ALIAS = 0x1000, 
     /// <summary> 
     /// combine with CSIDL_ value to indicate per-user init (eg. upgrade) 
     /// </summary> 
     CSIDL_FLAG_PER_USER_INIT = 0x0800, 
     /// <summary> 
     /// mask for all possible 
     /// </summary> 
     CSIDL_FLAG_MASK = 0xFF00, 
    } 

    public enum SHGetFolderLocationReturnValues : uint 
    { 
     /// <summary> 
     /// Success 
     /// </summary> 
     S_OK = 0x00000000, 
     /// <summary> 
     /// The CSIDL in nFolder is valid but the folder does not exist 
     /// </summary> 
     S_FALSE = 0x00000001, 
     /// <summary> 
     /// The CSIDL in nFolder is not valid 
     /// </summary> 
     E_INVALIDARG = 0x80070057 
    } 

    public static IntPtr GetPidlFromFolderID(IntPtr hWnd, CSIDL Id) 
    { 
     IntPtr pIdl = IntPtr.Zero; 
     SHGetFolderLocationReturnValues res = (SHGetFolderLocationReturnValues) 
      SHGetSpecialFolderLocation(
      hWnd, 
      Id, 
      out pIdl); 
     return (pIdl); 
    } 


    public Form1() 
    { 
     InitializeComponent(); 

     SampleProc = new WindProc (SubclassWndProc); 

     OldDefProc = GetWindowLong(this.Handle, GWL_WNDPROC); 

     SetWindowLong(this.Handle, GWL_WNDPROC, Marshal.GetFunctionPointerForDelegate(SampleProc)/*SampleProc.Method.MethodHandle.Value.ToInt32()*/); 

     //tagSHCHANGENOTIFYENTRY changeentry = new tagSHCHANGENOTIFYENTRY(); 
     //changeentry.dwEventMask = (ulong)SHCNE.SHCNE_ALLEVENTS; 
     //changeentry.fRecursive = true; 
     //changeentry.WatchDir = null; 

     //SHChangeNotifyRegister(this.Handle, ref changeentry); 

     SHChangeNotifyEntry changeentry = new SHChangeNotifyEntry(); 




     changeentry.pIdl = GetPidlFromFolderID(this.Handle, CSIDL.CSIDL_DESKTOP); 
     changeentry.Recursively = true; 

     try 
     { 
      uint notifyid = SHChangeNotifyRegister(
      this.Handle, 
      SHCNF.SHCNF_TYPE | SHCNF.SHCNF_IDLIST, 
      SHCNE.SHCNE_ALLEVENTS, 
      WM_FILECHANGEINFO, 
      1, ref changeentry); 


     } 

     catch (Exception ee) 
     { 

     } 

我在SHChangeNotifyRegister失敗，請幫助我..告訴我爲什麼我的桌面crashing..same代碼做工精細的原因..請幫助

謝謝。

Answer 1

SHChangeNotifyRegister未正確申報，下面的代碼成功返回，不知道如果我得到一個通知，當我創建一個文件雖然:)

public partial class Form1 : Form 
    { 
     public Form1() 
     { 
      InitializeComponent(); 

      SHChangeNotifyEntry changeEntry = new SHChangeNotifyEntry(); 

      changeEntry.dwEventMask = (uint)SHCNE.SHCNE_CREATE; 
      changeEntry.Recursive = false; 
      changeEntry.pszWatchDir = "\\My Documents\\"; 

      try 
      { 
       bool result = SHChangeNotifyRegister(this.Handle, ref changeEntry); 
      } 
      catch (Exception ee) 
      { 

      } 
     } 

     [DllImport("aygshell.dll")] 
     private static extern bool SHChangeNotifyRegister(IntPtr hwnd, ref SHChangeNotifyEntry test); 

     private void Form1_Load(object sender, EventArgs e) 
     { 

     } 
    } 

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] 
    struct SHChangeNotifyEntry 
    { 
     public uint dwEventMask; 
     [MarshalAs(UnmanagedType.LPWStr)] 
     public string pszWatchDir; 
     public bool Recursive; 
    } 
}