如何使用c#读取二进制文件？

Question

我有一个二进制文件.我不知道如何使用C#读取这个二进制文件.

C++中描述的二进制文件中记录的定义是:

#define SIZEOF_FILE(10*1024)
//Size of 1234.dat file is: 10480 + 32 byte (32 = size of file header)
typedef struct FileRecord
{
 WCHAR ID[56]; 
 WCHAR Name[56];
 int Gender;
 float Height;
 WCHAR Telephne[56];
 and........
}

如何在C#中读取包含这些记录的二进制文件,并在编辑后将其写回？

Answer 1

实际上有一种更好的方法可以使用struct类型并 StructLayout直接映射到二进制文件中的数据结构(我还没有测试过实际的映射,但这是查找它并检查你从哪里回来的问题阅读文件):

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 1)]
public struct FileRecord
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 56)]
    public char[] ID;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 56)]
    public char[] Name;
    public int Gender;
    public float height;
    //...
}

class Program
{
    protected static T ReadStruct<T>(Stream stream)
    {
        byte[] buffer = new byte[Marshal.SizeOf(typeof(T))];
        stream.Read(buffer, 0, Marshal.SizeOf(typeof(T)));
        GCHandle handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
        T typedStruct = (T)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(T));
        handle.Free();
        return typedStruct;
    }

    static void Main(string[] args)
    {
        using (Stream stream = new FileStream(@"test.bin", FileMode.Open, FileAccess.Read))
        {
            FileRecord fileRecord = ReadStruct<FileRecord>(stream);
        }
    }