将字节数组封送到C#结构
我正在做一个C#项目，用于读取FAT32引导扇区和BPB，问题是我正在使用封送机制将字节数组转换为自定义FAT32数据结构。 我收到一条错误消息，上面说： 无法从程序集“FAT32Management，版本=1.0.0.0，区域性=中性，PublicKeyToken=null”加载类型“FAT32Management.Fat32BootSector”，因为它在偏移量3处包含一个对象字段，该字段未正确对齐或与非对象字段重叠 我无法解决这个问题 这是密码将字节数组封送到C#结构,c#,unmanaged,marshalling,C#,Unmanaged,Marshalling,我正在做一个C#项目，用于读取FAT32引导扇区和BPB，问题是我正在使用封送机制将字节数组转换为自定义FAT32数据结构。 我收到一条错误消息，上面说： 无法从程序集“FAT32Management，版本=1.0.0.0，区域性=中性，PublicKeyToken=null”加载类型“FAT32Management.Fat32BootSector”，因为它在偏移量3处包含一个对象字段，该字段未正确对齐或与非对象字段重叠 我无法解决这个问题 这是密码 using System; using Sy
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
namespace FAT32Management
{
[StructLayout(LayoutKind.Explicit)]//, CharSet = CharSet.Ansi, Size = 96, Pack = 1)]
public struct Fat32BootSector
{
#region Common Region With all FAT systems
/// <summary>
/// First 3 Bytes of the Jump insctructions.
/// Offset 0x00
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
[FieldOffset(0x00)]
public byte[] JumpBootInstructions;
/// <summary>
/// 8 Bytes of the OemName
/// Offset 0x03
/// </summary>
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 8)]
[FieldOffset(0x03)]
public string OemName;
#region BIOS Parameter Block (BPB)
/// <summary>
/// 2 Bytes of the BytesPerSector parameter. The BIOS Paramter Block Starts here
/// Offset 0x0b
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x0b)]
public ushort BpbBytesPerSector;
/// <summary>
/// 1 Byte containing the number of sectors per cluster. This must be a power of 2 from 1 to 128
/// Offset 0x0d
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x0d)]
public byte BpbSectorsPerCluster;
/// <summary>
/// 2 Bytes for the Bpb reserved sectors count, Usually 32 for FAT32.
/// Offset 0x0e
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x0e)]
public ushort BpbReservedSectorsCount;
/// <summary>
/// 1 Byte Number of file allocation tables. Almost always 2.
/// Offset 0x10
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x10)]
public byte BpbFatCount;
/// <summary>
/// 2 Bytes, Maximum number of root directory entries. Only used on FAT12 and FAT16
/// Offset 0x11
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x11)]
public ushort BpbMaxRootDirectoriesCount;
/// <summary>
/// 2 Bytes, Total sectors (if zero, use 4 byte value at offset 0x20) used only for FAT12 AND FAT16 Systems
/// Offset 0x13
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x13)]
public ushort BpbTotalSectors16;
/// <summary>
/// 1 Byte, the media descriptor
/// Offset 0x15
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x15)]
public MediaDescriptor BpbMediaDescriptor;
/// <summary>
/// 2 Bytes, Sectors per File Allocation Table for FAT12/FAT16
/// Offset 0x16
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x16)]
public ushort BpbSectorsPerFat16;
/// <summary>
/// 2 Bytes, Sectors per track
/// Offset 0x18
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x18)]
public ushort BpbSectorsPerTrack;
/// <summary>
/// 2 Bytes Number of heads.
/// Offset 0x1a
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x1a)]
public ushort BpbNumberOfHeads;
/// <summary>
/// 4 Bytes Hidden sectors.
/// Offset 0x1c
/// </summary>
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(0x1c)]
public uint BpbHiddenSectors;
/// <summary>
/// 4 Bytes, Total sectors (if greater than 65535; otherwise, see offset 0x13)
/// Offset 0x20
/// </summary>
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(0x20)]
public uint BpbTotalSectors32;
#endregion
#endregion
#region Extended BIOS Parameter Block: FAT32 Specific
/// <summary>
/// 4 Bytes for the number of sectors occupied by ONE FAT.
/// Offset 0x24
/// </summary>
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(0x24)]
public uint FatSize32;
/// <summary>
/// 2 Bytes
/// This field is only defined for FAT32 media and does not exist on FAT12 and FAT16 media.
/// Bits 0-3 -- Zero-based number of active FAT. Only valid if mirroring is disabled.
/// Bits 4-6 -- Reserved.
/// Bit 7 -- 0 means the FAT is mirrored at runtime into all FATs.
/// -- 1 means only one FAT is active; it is the one referenced in bits 0-3.
/// Bits 8-15 -- Reserved.
/// Offset 0x28
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x28)]
public ushort ExtendedFlags;
/// <summary>
/// 2 Bytes for the file system version. The high byte is major revision number. Low byte is minor revision number.
/// Offset 0x2a
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
[FieldOffset(0x24)]
public byte[] FileSystemVersion;
/// <summary>
/// 4 Bytes for the first cluster number of the root directory
/// Offset 0x2c
/// </summary>
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(0x2c)]
public uint RootDirFirstClusterNumber;
/// <summary>
/// 2 Bytes for the Sector number of FS Information Sector.
/// Offset 0x30
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x30)]
public ushort FSInfoSectorNumber;
/// <summary>
/// 2 Bytes. If non-zero, indicates the sector number in the reserved area of the volume of a copy of the boot record. Usually 6.
/// Offset 0x32
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x32)]
public ushort BackupBootSectorNumber;
/// <summary>
/// 12 Reserved Bytes.
/// Offset 0x34
/// </summary>
[MarshalAs(UnmanagedType.ByValArray,SizeConst = 12)]
[FieldOffset(0x34)]
public byte[] Reserved;
/// <summary>
/// 1 Byte for the physical drive number.
/// Offset 0x40
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x40)]
public byte PhysicalDriveNumber;
/// <summary>
/// 1 Reserved byte.
/// Offset 0x41
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x41)]
public byte Reserved1;
/// <summary>
/// 1 Byte. The boot signature
/// Offset 0x42
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x42)]
public byte ExtendedBootSignature;
/// <summary>
/// 4 Bytes for the volume serial number.
/// Offset 0x43
/// </summary>
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(0x43)]
public uint VolumeID;
/// <summary>
/// 11 Byte for the volume label.
/// Offset 0x47
/// </summary>
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 11)]
[FieldOffset(0x47)]
public string VolumeLabel;
/// <summary>
/// 8 Bytes for the file system type string.
/// Offset 0x52
/// </summary>
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 8)]
[FieldOffset(0x52)]
public string FileSystemType;
#endregion
/// <summary>
/// Gets the boot sector for the specified drive.
/// <remarks>The drive letter must have this pattern X: </remarks>
/// </summary>
/// <param name="driveLetter">The </param>
/// <returns>The boot sector for the specified drive.</returns>
public static Fat32BootSector GetBootSectorForDrive(string driveLetter)
{
byte[] bootSector = new byte[Marshal.SizeOf(typeof(Fat32BootSector))];
string drive = @"\\.\" + driveLetter;
IntPtr hardDiskPointer = SystemIOCalls.OpenFile(drive);
// Seeks to the start of the partition
SystemIOCalls.SeekAbsolute(hardDiskPointer, 0, 0);
// Read the first reserved sector of the drive data (Boot Sector)
// The data should be read with a chunk of 512 X byte.
SystemIOCalls.ReadBytes(hardDiskPointer, bootSector, 512);
SystemIOCalls.CloseHandle(hardDiskPointer);
// Marshaling the bytes array to a valid struct
GCHandle pinnedInfos = GCHandle.Alloc(bootSector, GCHandleType.Pinned);
var infos = (Fat32BootSector)Marshal.PtrToStructure(pinnedInfos.AddrOfPinnedObject(), typeof(Fat32BootSector));
pinnedInfos.Free();
return infos;
}
}
}
使用系统；
使用System.Collections.Generic；
使用System.Linq；
使用System.Runtime.InteropServices；
使用系统文本；
名称空间管理
{
[StructLayout（LayoutKind.Explicit）]/，CharSet=CharSet.Ansi，Size=96，Pack=1]
公共结构FAT32B扇区
{
#区域所有FAT系统的公共区域
///
///跳转指令的前3个字节。
///偏移量0x00
///
[Marshallas（UnmanagedType.ByValArray，SizeConst=3）]
[字段偏移量（0x00）]
公共字节[]指令；
///
///OemName的8个字节
///偏移量0x03
///
[Marshallas（UnmanagedType.ByValTStr，SizeConst=8）]
[字段偏移量（0x03）]
公共字符串OemName；
#区域BIOS参数块（BPB）
///
///BytePersector参数的2字节。BIOS参数块从这里开始
///偏移量0x0b
///
[Marshallas（UnmanagedType.U2）]
[字段偏移量（0x0b）]
公共ushort BpbBytesPerSector；
///
///1字节，包含每个群集的扇区数。这必须是1到128之间的2的幂
///偏移量0x0d
///
[Marshallas（UnmanagedType.U1）]
[字段偏移量（0x0d）]
公共字节BpbSectorsPerCluster；
///
///Bpb保留扇区计数为2字节，FAT32通常为32字节。
///偏移量0x0e
///
[Marshallas（UnmanagedType.U2）]
[字段偏移量（0x0e）]
公共ushort BpbReservedSectorsCount；
///
///文件分配表的1字节数。几乎总是2字节。
///偏移量0x10
///
[Marshallas（UnmanagedType.U1）]
[字段偏移量（0x10）]
公共字节BpbFatCount；
///
///2字节，最大根目录条目数。仅用于FAT12和FAT16
///偏移量0x11
///
[Marshallas（UnmanagedType.U2）]
[字段偏移量（0x11）]
公共ushort BpbMaxRootDirectoriesCount；
///
///2字节，总扇区（如果为零，则在偏移量0x20处使用4字节值），仅用于FAT12和FAT16系统
///偏移量0x13
///
[Marshallas（UnmanagedType.U2）]
[字段偏移量（0x13）]
公共卫生服务部门BPBtotalSector 16；
///
///1字节，媒体描述符
///偏移量0x15
///
[Marshallas（UnmanagedType.U1）]
[字段偏移量（0x15）]
公共媒体描述符BpbMediaDescriptor；
///
///FAT12/FAT16的每个文件分配表2字节、扇区
///偏移量0x16
///
[Marshallas（UnmanagedType.U2）]
[字段偏移量（0x16）]
公共ushort BPBSectorPerfat16；
///
///2字节，每个磁道扇区
///偏移量0x18
///
[Marshallas（UnmanagedType.U2）]
[字段偏移量（0x18）]
公共ushort BpbSectorsPerTrack；
///
///2字节的头数。
///偏移量0x1a
///
[Marshallas（UnmanagedType.U2）]
[字段偏移量（0x1a）]
公共ushort BPB头数；
///
///4字节隐藏扇区。
///偏移量0x1c
///
[Marshallas（UnmanagedType.U4）]
[字段偏移量（0x1c）]
公共部门；
///
///4字节，总扇区（如果大于65535；否则，请参阅偏移量0x13）
///偏移量0x20
///
[Marshallas（UnmanagedType.U4）]
[字段偏移量（0x20）]
公共单位BPB总公司32；
#端区
#端区
#区域扩展BIOS参数块：FAT32特定
///
///4字节表示一个FAT占用的扇区数。
///偏移量0x24
///
[Marshallas（UnmanagedType.U4）]
[字段偏移量（0x24）]
公共单位FatSize32；
///
///2字节
///此字段仅为FAT32介质定义，在FAT12和FAT16介质上不存在。
///位0-3—从零开始的活动FAT数。仅在禁用镜像时有效。
///位4-6——保留。
///位7--0表示FAT在运行时镜像到所有FAT中。
///--1表示只有一个FAT处于活动状态；它是位0-3中引用的FAT。
///位8-15——保留。
///偏移量0x28
///
[Marshallas（UnmanagedType.U2）]
[字段偏移量（0x28）]
美国国旗；
///
///文件系统版本为2字节。高字节为主要版本号。低字节为次要版本号。
///偏移量0x2a
///
[Marshallas（UnmanagedType.ByValArray，SizeConst=2）]
[字段偏移量（0x24）]
公共字节[]文件系统版本；
///
///根目录的第一个群集编号为4字节
///偏移量0x2c
///
[Marshallas（UnmanagedType.U4）]
[字段偏移量（0x2c）]
公共uint RootDirFirstClusterNumber；
///
///FS信息扇区的扇区号为2字节。
///偏移量0x30
///
[Marshallas（UnmanagedType.U2）]
[字段偏移量（0x30）]
公共ushort FSInfoSectorNumber；
///
///2字节。如果非零，则表示引导记录副本卷的保留区域中的扇区号。
[FieldOffset(0x03)]
public fixed byte OemName[8]
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
namespace FAT32Management
{
[StructLayout(LayoutKind.Explicit, CharSet = CharSet.Ansi, Size = 96, Pack = 1)]
public unsafe struct Fat32BootSector
{
#region Common Region With all FAT systems
/// <summary>
/// First 3 Bytes of the Jump insctructions.
/// Offset 0x00
/// </summary>
//[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
[FieldOffset(0x00)]
public fixed byte JumpBootInstructions[3];
/// <summary>
/// 8 Bytes of the OemName
/// Offset 0x03
/// </summary>
[FieldOffset(0x03)]
public fixed char OemName[8];
#region BIOS Parameter Block (BPB)
/// <summary>
/// 2 Bytes of the BytesPerSector parameter. The BIOS Paramter Block Starts here
/// Offset 0x0b
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x0b)]
public ushort BpbBytesPerSector;
/// <summary>
/// 1 Byte containing the number of sectors per cluster. This must be a power of 2 from 1 to 128
/// Offset 0x0d
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x0d)]
public byte BpbSectorsPerCluster;
/// <summary>
/// 2 Bytes for the Bpb reserved sectors count, Usually 32 for FAT32.
/// Offset 0x0e
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x0e)]
public ushort BpbReservedSectorsCount;
/// <summary>
/// 1 Byte Number of file allocation tables. Almost always 2.
/// Offset 0x10
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x10)]
public byte BpbFatCount;
/// <summary>
/// 2 Bytes, Maximum number of root directory entries. Only used on FAT12 and FAT16
/// Offset 0x11
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x11)]
public ushort BpbMaxRootDirectoriesCount;
/// <summary>
/// 2 Bytes, Total sectors (if zero, use 4 byte value at offset 0x20) used only for FAT12 AND FAT16 Systems
/// Offset 0x13
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x13)]
public ushort BpbTotalSectors16;
/// <summary>
/// 1 Byte, the media descriptor
/// Offset 0x15
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x15)]
public MediaDescriptor BpbMediaDescriptor;
/// <summary>
/// 2 Bytes, Sectors per File Allocation Table for FAT12/FAT16
/// Offset 0x16
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x16)]
public ushort BpbSectorsPerFat16;
/// <summary>
/// 2 Bytes, Sectors per track
/// Offset 0x18
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x18)]
public ushort BpbSectorsPerTrack;
/// <summary>
/// 2 Bytes Number of heads.
/// Offset 0x1a
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x1a)]
public ushort BpbNumberOfHeads;
/// <summary>
/// 4 Bytes Hidden sectors.
/// Offset 0x1c
/// </summary>
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(0x1c)]
public uint BpbHiddenSectors;
/// <summary>
/// 4 Bytes, Total sectors (if greater than 65535; otherwise, see offset 0x13)
/// Offset 0x20
/// </summary>
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(0x20)]
public uint BpbTotalSectors32;
#endregion
#endregion
#region Extended BIOS Parameter Block: FAT32 Specific
/// <summary>
/// 4 Bytes for the number of sectors occupied by ONE FAT.
/// Offset 0x24
/// </summary>
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(0x24)]
public uint FatSize32;
/// <summary>
/// 2 Bytes
/// This field is only defined for FAT32 media and does not exist on FAT12 and FAT16 media.
/// Bits 0-3 -- Zero-based number of active FAT. Only valid if mirroring is disabled.
/// Bits 4-6 -- Reserved.
/// Bit 7 -- 0 means the FAT is mirrored at runtime into all FATs.
/// -- 1 means only one FAT is active; it is the one referenced in bits 0-3.
/// Bits 8-15 -- Reserved.
/// Offset 0x28
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x28)]
public ushort ExtendedFlags;
/// <summary>
/// 2 Bytes for the file system version. The high byte is major revision number. Low byte is minor revision number.
/// Offset 0x2a
/// </summary>
[FieldOffset(0x2a)]
public fixed byte FileSystemVersion[2];
/// <summary>
/// 4 Bytes for the first cluster number of the root directory
/// Offset 0x2c
/// </summary>
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(0x2c)]
public uint RootDirFirstClusterNumber;
/// <summary>
/// 2 Bytes for the Sector number of FS Information Sector.
/// Offset 0x30
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x30)]
public ushort FSInfoSectorNumber;
/// <summary>
/// 2 Bytes. If non-zero, indicates the sector number in the reserved area of the volume of a copy of the boot record. Usually 6.
/// Offset 0x32
/// </summary>
[MarshalAs(UnmanagedType.U2)]
[FieldOffset(0x32)]
public ushort BackupBootSectorNumber;
/// <summary>
/// 12 Reserved Bytes.
/// Offset 0x34
/// </summary>
[FieldOffset(0x34)]
public fixed byte Reserved[12];
/// <summary>
/// 1 Byte for the physical drive number.
/// Offset 0x40
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x40)]
public byte PhysicalDriveNumber;
/// <summary>
/// 1 Reserved byte.
/// Offset 0x41
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x41)]
public byte Reserved1;
/// <summary>
/// 1 Byte. The boot signature
/// Offset 0x42
/// </summary>
[MarshalAs(UnmanagedType.U1)]
[FieldOffset(0x42)]
public byte ExtendedBootSignature;
/// <summary>
/// 4 Bytes for the volume serial number.
/// Offset 0x43
/// </summary>
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(0x43)]
public uint VolumeID;
/// <summary>
/// 11 Byte for the volume label.
/// Offset 0x47
/// </summary>
[FieldOffset(0x47)]
public fixed char VolumeLabel[11];
/// <summary>
/// 8 Bytes for the file system type string.
/// Offset 0x52
/// </summary>
[FieldOffset(0x52)]
public fixed char FileSystemType[8];
#endregion
/// <summary>
/// Gets the boot sector for the specified drive.
/// <remarks>The drive letter must have this pattern X: </remarks>
/// </summary>
/// <param name="driveLetter">The </param>
/// <returns>The boot sector for the specified drive.</returns>
public static Fat32BootSector GetBootSectorForDrive(string driveLetter)
{
byte[] bootSector = new byte[Marshal.SizeOf(typeof(Fat32BootSector))];
string drive = @"\\.\" + driveLetter;
IntPtr hardDiskPointer = SystemIOCalls.OpenFile(drive);
// Seeks to the start of the partition
SystemIOCalls.SeekAbsolute(hardDiskPointer, 0, 0);
// Read the first reserved sector of the drive data (Boot Sector)
// The data should be read with a chunk of 512 X byte.
SystemIOCalls.ReadBytes(hardDiskPointer, bootSector, 512);
SystemIOCalls.CloseHandle(hardDiskPointer);
// Marshaling the bytes array to a valid struct
GCHandle pinnedInfos = GCHandle.Alloc(bootSector, GCHandleType.Pinned);
var infos = (Fat32BootSector)Marshal.PtrToStructure(pinnedInfos.AddrOfPinnedObject(), typeof(Fat32BootSector));
pinnedInfos.Free();
return infos;
}
}
}