请教C#中读取这种文件格式方法

//using System.Media; //using System.Runtime.InteropServices; [StructLayout(LayoutKind.Sequential, Pack = 1)] public struct SECTION { public byte Type; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 0x20)] public double[] S3; } private void button1_Click(object sender, EventArgs e) { FileStream fileStream = new FileStream(@"c:\temp\temp.dat", FileMode.Open, FileAccess.Read); byte[] buffer = new byte[Marshal.SizeOf(typeof(SECTION))]; fileStream.Read(buffer, 0, buffer.Length); SECTION section = (SECTION)Marshal.PtrToStructure( Marshal.UnsafeAddrOfPinnedArrayElement(buffer, 0), typeof(SECTION)); fileStream.Close(); fileStream.Dispose(); Console.WriteLine("Type={0}, S3[0]={1}, S3[1]={2}, S3[2]={3}", section.Type, section.S3[0], section.S3[1], section.S3[2]); }

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发表于：2008-08-23 23:03:0318楼得分:10

这个文件打开分析了下，有五段数据，每段44字节：

详情01 1F 00 40 00 00 00 00 00 00 59 40 00 00 00 00 00 40 8F 40 00 00 00 00 00 40 8F 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
02 00 00 00 00 00 00 00 00 C0 62 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 10 34 00 40 01 00 00 00
03 00 00 00 00 00 00 00 00 C0 82 40 3B 70 CE 88 D2 73 8D 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
04 00 00 00 00 00 00 00 00 00 79 40 00 00 00 00 00 C0 82 40 00 00 00 00 00 00 89 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
02 1F 00 40 00 00 00 00 00 E0 85 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 10 34 00 40 04 00 00 00

1(char)+5*8(double)=41
看来多3个字节，第一char对齐估计是4.

C# code

[StructLayout(LayoutKind.Sequential, Pack = 4)]
public class SECTION
{
    public byte Type;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)]
    public double[] D5 = new double[5];
}

private void button2_Click(object sender, EventArgs e)
{
    FileStream fileStream = new FileStream(@"c:\temp\123.HAL",
        FileMode.Open, FileAccess.Read);
    byte[] buffer = new byte[Marshal.SizeOf(typeof(SECTION))];
    while (fileStream.Read(buffer, 0, buffer.Length) >= buffer.Length)
    {
        SECTION section = new SECTION();
        Marshal.PtrToStructure(
            Marshal.UnsafeAddrOfPinnedArrayElement(buffer, 0), section);

        Console.WriteLine(
            "Type={0}, D5[0]={1}, D5[1]={2}, D5[2]={3}, D5[3]={4}, D5[4]={5}",
            section.Type, section.D5[0], section.D5[1], section.D5[2],
            section.D5[3], section.D5[4]);
    }
    fileStream.Close();
    fileStream.Dispose();
}

输出Type=1, D5[0]=100, D5[1]=1000, D5[2]=1000, D5[3]=0, D5[4]=0
Type=2, D5[0]=150, D5[1]=0, D5[2]=0, D5[3]=0, D5[4]=2.65250132361352E-314
Type=3, D5[0]=600, D5[1]=942.4778, D5[2]=0, D5[3]=0, D5[4]=0
Type=4, D5[0]=400, D5[1]=600, D5[2]=800, D5[3]=0, D5[4]=0
Type=2, D5[0]=700, D5[1]=0, D5[2]=0, D5[3]=0, D5[4]=9.01848869650934E-314

修改删除举报引用回复

[StructLayout(LayoutKind.Sequential, Pack = 4)] public class SECTION { public byte Type; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)] public double[] D5 = new double[5]; } private void button1_Click(object sender, EventArgs e) { FileStream fileStream = new FileStream(@"c:\temp\temp.dat", FileMode.Create, FileAccess.Write); byte[] buffer = new byte[Marshal.SizeOf(typeof(SECTION))]; SECTION section = new SECTION(); section.Type = 13; section.D5[0] = 12.34; section.D5[1] = 56.78; section.D5[2] = 90.12; section.D5[3] = 34.56; section.D5[4] = 78.90; Marshal.StructureToPtr(section, Marshal.UnsafeAddrOfPinnedArrayElement(buffer, 0), false); fileStream.Write(buffer, 0, buffer.Length); // ...写入多条数据，就重复上面的执行。 fileStream.Close(); fileStream.Dispose(); }