Pinvoke命令长度错误

Pinvoke command length is incorrect

本文关键字：错误 命令 Pinvoke      更新时间：2023-10-16

我试图获得FILE_ID_BOTH_DIR_INFO与GetFileInformationByHandle函数。调用后，我的所有值都被设置为零。
我得到win32错误消息:
ERROR_BAD_LENGTH程序发出命令，但命令长度不正确

IntPtr handle = CreateFile(dir, EFileAccess.GenericRead, EFileShare.Read, IntPtr.Zero, ECreationDisposition.OpenExisting, EFileAttributes.BackupSemantics | EFileAttributes.Normal, IntPtr.Zero);
FILE_ID_BOTH_DIR_INFO fileStruct = new FILE_ID_BOTH_DIR_INFO();
GetFileInformationByHandleEx(handle, FILE_INFO_BY_HANDLE_CLASS.FileIdBothDirectoryInfo, out fileStruct, (uint)Marshal.SizeOf(fileStruct));

FILE_ID_BOTH_DIR_INFO结构
    typedef struct _FILE_ID_BOTH_DIR_INFO {
    DWORD         NextEntryOffset;
    DWORD         FileIndex;
    LARGE_INTEGER CreationTime;
    LARGE_INTEGER LastAccessTime;
    LARGE_INTEGER LastWriteTime;
    LARGE_INTEGER ChangeTime;
    LARGE_INTEGER EndOfFile;
    LARGE_INTEGER AllocationSize;
    DWORD         FileAttributes;
    DWORD         FileNameLength;
    DWORD         EaSize;
    CCHAR         ShortNameLength;
    WCHAR         ShortName[12];
    LARGE_INTEGER FileId;
    WCHAR         FileName[1];
    } FILE_ID_BOTH_DIR_INFO, *PFILE_ID_BOTH_DIR_INFO
用c# 

    public struct FILE_ID_BOTH_DIR_INFO
    {
        uint NextEntryOffset;
        uint FileIndex;
        LARGE_INTEGER CreationTime;
        LARGE_INTEGER LastAccessTime;
        LARGE_INTEGER LastWriteTime;
        LARGE_INTEGER ChangeTime;
        LARGE_INTEGER EndOfFile;
        LARGE_INTEGER AllocationSize;
        uint FileAttributes;
        uint FileNameLength;
        uint EaSize;
        char ShortNameLength;
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 12)]
        string ShortName;
        LARGE_INTEGER FileId;
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 1)]
        string FileName;
    }
    [StructLayout(LayoutKind.Explicit, Size = 8)]
    struct LARGE_INTEGER
    {
        [FieldOffset(0)]
        public Int64 QuadPart;
        [FieldOffset(0)]
        public UInt32 LowPart;
        [FieldOffset(4)]
        public Int32 HighPart;
    }

ByValTStr的字符集由StructLayout属性的CharSet参数决定。由于您没有指定，因此使用默认的8位ANSI。如果您指定CharSet为CharSet。Unicode应该能解决这个问题。将这个属性添加到struct中:

[StructLayout(LayoutKind.Sequential, 
    CharSet=CharSet.Unicode)]

为了调试的目的，编写一个c++程序输出结构体的大小。确保你的c#程序匹配这个值。

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