修改符号链接详情：CreateFilePrivate调用报错问题排查

问题场景 #

通过PowerShell调用自定义Win32类的setFileDetails方法，代码如下：

$path = "D:\temporal\t1.txt"
$item = Get-Item -LiteralPath $path -Force
[Win32]::setFileDetails($path, $item.CreationTimeUtc.ToFileTime(), $item.LastAccessTimeUtc.ToFileTime(), $item.LastWriteTimeUtc.AddDays(1).ToFileTime())

对应的C# Win32类实现代码：

using System;       // 依赖该程序集的部分内容
using System.Runtime.InteropServices;       // 用于DllImport和Marshal相关操作
using Microsoft.Win32.SafeHandles;      // 引入SafeFileHandle
using System.IO;        // 引入FileShare、FileMode

public class Win32 {

    struct FILE_BASIC_INFO {
        internal long CreationTime;
        internal long LastAccessTime;
        internal long LastWriteTime;
        internal long ChangeTime;
        internal uint FileAttributes;       // 文件属性（二进制值）
    };

    [Flags]
    enum AccessRights: uint {       // Windows PowerShell的`Add-Type`不支持System.Messaging.GenericAccessRights
        // 通用访问权限
        Read = 0x80000000,      // 2147483648，对应十进制-2147483648
        Write = 0x40000000,     // 1073741824
        Execute = 0x20000000,   // 536870912
        All = 0x10000000,       // 268435456
        None = 0x00000000       // 0
    };

    [Flags]
    enum CreateFile_Options: uint {
        // 标志位
        ReparsePoint = 0x00200000,      // 若为符号链接则不跟随，对应OPEN_REPARSE_POINT
        BACKUP_SEMANTICS = 0x02000000,
        DELETE_ON_CLOSE = 0x04000000,
        NO_BUFFERING = 0x20000000,
        OPEN_NO_RECALL = 0x00100000,
        OVERLAPPED = 0x40000000,
        POSIX_SEMANTICS = 0x01000000,
        RANDOM_ACCESS = 0x10000000,
        SESSION_AWARE = 0x00800000,
        SEQUENTIAL_SCAN = 0x08000000,
        WRITE_THROUGH = 0x80000000
    };

    [DllImport("kernel32.dll", SetLastError = true)]
    static extern bool SetFileInformationByHandle(
        SafeFileHandle item,
        int Type_v,     // 对应枚举FILE_INFO_BY_HANDLE_CLASS
        ref FILE_BASIC_INFO sho_v,      // 指针类型参数
        uint size_v
    );
    [DllImport("kernel32.dll", SetLastError = true)]
    static extern bool GetFileInformationByHandleEx(
        SafeFileHandle item,
        int Type_v,     // 对应枚举FILE_INFO_BY_HANDLE_CLASS
        ref FILE_BASIC_INFO sho_v,      // 指针类型参数
        uint size_v
    );
    [DllImport("kernel32.dll", EntryPoint = "CreateFileW", SetLastError = true)]
    static extern SafeFileHandle CreateFilePrivate(
        string path,
        AccessRights v_Access,
        FileShare v_Share,
        IntPtr v_Security,      // 传IntPtr.Zero使用默认安全设置，也可传入SECURITY_ATTRIBUTES结构体引用
        FileMode a,
        CreateFile_Options v_Options,
        IntPtr Template     // 不能传SafeFileHandle类型的null，改用IntPtr.Zero
    );
    
    public static void setFileDetails (
        string path,
        long CreationEventTime,
        long ReadingEventTime,
        long WritingEventTime
        // System.IO.FileAttributes FileAttributes
    ) {
        SafeFileHandle item = CreateFilePrivate(path , AccessRights.Read | AccessRights.Write , FileShare.Read , IntPtr.Zero , FileMode.Open , CreateFile_Options.ReparsePoint , IntPtr.Zero);

        Console.WriteLine(path);     // 输出的路径100%指向符号链接
        Console.WriteLine(Marshal.GetLastWin32Error());     // 返回错误码2，对应ERROR_FILE_NOT_FOUND
        
        var BasicInfo = new FILE_BASIC_INFO();
        GetFileInformationByHandleEx(item, (int) 0, ref BasicInfo, (uint) Marshal.SizeOf(BasicInfo));
        
        BasicInfo = new FILE_BASIC_INFO() {
            CreationTime = CreationEventTime,
            LastAccessTime = ReadingEventTime,
            LastWriteTime = WritingEventTime,
            ChangeTime = BasicInfo.ChangeTime,
            FileAttributes = (uint) 0       // 设为0表示不修改文件属性
        };
        SetFileInformationByHandle(item, (int) 0, ref BasicInfo, (uint) Marshal.SizeOf(BasicInfo));
    }
}

当前问题 #

已根据@Dai的建议修复代码，但问题依旧：调用后返回错误码2（ERROR_FILE_NOT_FOUND），且已确认路径指向的是符号链接。

内容的提问来源于stack exchange，提问作者irvnriir