FileAssociation

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原创最新推荐文章于 2026-03-11 07:04:01 发布 1.3k 阅读 AI 写同款· GEO 优化 ›

STM32 移植LwIP 实现网线插拔自动恢复 STM32 移植LwIP 之后，能正常联网通讯，但是发现2个问题， 1、上电初始化前，未插入网线，之后就无法获取到IP地址（DHCP） 2、正常通讯过程中，拔掉网线，然后插回去，不知道如何复位先看一下LWIP初始化代码 /** * LwIP initialization function */ int MX_LWIP_Init() { /* Initilialize the LwIP stack with RTOS */ tcpip_init( NULL, NULL ); 阅读详情

using System;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using Microsoft.Win32;

namespace wsWin
{
    #region [ FileAssociation ]
    public class FileAssociation
    {
        public static string Startpath()
        {
            return System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
        }

        public static void DoAssociate(string extension, string progID, string description, string icon)
        {
            if (FileAssociation.IsAssociated(extension))
            {
                RegistryKey key = Registry.ClassesRoot;
                key.DeleteSubKeyTree(extension);
                key.Close();
            }
            FileAssociation.Associate(extension, progID, description, icon, Application.ExecutablePath);
            FileAssociation.refreshSystem();
        }

        public static void DoAssociate(string extension, string progID, string description, string icon, string application)
        {
            if (FileAssociation.IsAssociated(extension))
            {
                RegistryKey key = Registry.ClassesRoot;
                key.DeleteSubKeyTree(extension);
                key.Close();
            }
            FileAssociation.Associate(extension, progID, description, icon, application);
            FileAssociation.refreshSystem();
        }

        public static void UnAssociate(string extension)
        {
            if (FileAssociation.IsAssociated(extension))
            {
                RegistryKey key = Registry.ClassesRoot;
                key.DeleteSubKeyTree(extension);
                key.Close();
                FileAssociation.refreshSystem();
            }
        }

        // Associate file extension with progID, description, icon and application
        public static void Associate(string extension, string progID, string description, string icon, string application)
        {
            Registry.ClassesRoot.CreateSubKey(extension).SetValue("", progID);
            if (progID != null && progID.Length > 0)
                using (RegistryKey key = Registry.ClassesRoot.CreateSubKey(progID))
                {
                    if (description != null)
                        key.SetValue("", description);
                    if (icon != null)
                        key.CreateSubKey("DefaultIcon").SetValue("", ToShortPathName(icon));
                    if (application != null)
                        key.CreateSubKey(@"Shell\Open\Command").SetValue("",
                                    ToShortPathName(application) + " \"%1\"");
                }
        }

        // Return true if extension already associated in registry
        public static bool IsAssociated(string extension)
        {
            return (Registry.ClassesRoot.OpenSubKey(extension, false) != null);
        }

        public static void refreshSystem()
        {
            SHChangeNotify(HChangeNotifyEventID.SHCNE_ASSOCCHANGED, HChangeNotifyFlags.SHCNF_IDLIST, IntPtr.Zero, IntPtr.Zero);
        }

        [DllImport("Kernel32.dll")]
        private static extern uint GetShortPathName(string lpszLongPath,
            [Out] StringBuilder lpszShortPath, uint cchBuffer);

        [DllImport("shell32.dll")]
        static extern void SHChangeNotify(HChangeNotifyEventID wEventId, HChangeNotifyFlags uFlags, IntPtr dwItem1, IntPtr dwItem2);

        // Return short path format of a file name
        private static string ToShortPathName(string longName)
        {
            StringBuilder s = new StringBuilder(1000);
            uint iSize = (uint)s.Capacity;
            uint iRet = GetShortPathName(longName, s, iSize);
            return s.ToString();
        }
    }

    #region public enum HChangeNotifyFlags

    [Flags]
    public enum HChangeNotifyFlags
    {

        SHCNF_DWORD = 0x0003,
        SHCNF_IDLIST = 0x0000,

        SHCNF_PATHA = 0x0001,

        SHCNF_PATHW = 0x0005,

        SHCNF_PRINTERA = 0x0002,

        SHCNF_PRINTERW = 0x0006,
        SHCNF_FLUSH = 0x1000,
        SHCNF_FLUSHNOWAIT = 0x2000
    }
    #endregion // enum HChangeNotifyFlags
    #region enum HChangeNotifyEventID
    [Flags]
    enum HChangeNotifyEventID
    {
        SHCNE_ALLEVENTS = 0x7FFFFFFF,

        SHCNE_ASSOCCHANGED = 0x08000000,

        SHCNE_ATTRIBUTES = 0x00000800,

        SHCNE_CREATE = 0x00000002,

        SHCNE_DELETE = 0x00000004,

        SHCNE_DRIVEADD = 0x00000100,

        SHCNE_DRIVEADDGUI = 0x00010000,

        SHCNE_DRIVEREMOVED = 0x00000080,

        SHCNE_EXTENDED_EVENT = 0x04000000,

        SHCNE_FREESPACE = 0x00040000,

        SHCNE_MEDIAINSERTED = 0x00000020,

        SHCNE_MEDIAREMOVED = 0x00000040,

        SHCNE_MKDIR = 0x00000008,

        SHCNE_NETSHARE = 0x00000200,

        SHCNE_NETUNSHARE = 0x00000400,

        SHCNE_RENAMEFOLDER = 0x00020000,

        SHCNE_RENAMEITEM = 0x00000001,

        SHCNE_RMDIR = 0x00000010,

        SHCNE_SERVERDISCONNECT = 0x00004000,

        SHCNE_UPDATEDIR = 0x00001000,

        SHCNE_UPDATEIMAGE = 0x00008000,

    }
    #endregion // enum HChangeNotifyEventID

    #endregion
}

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