from http://www.cnblogs.com/baishahe/archive/2010/03/18/1688995.html
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; using System.IO; namespace StructTest { public partial class Form1 : Form { string filename = @"d:\poi.st"; #region 结构体 //90 [StructLayout(LayoutKind.Sequential), Serializable] public struct MY_STRUCT { public double x; //点的经度坐标 public double y; //点的纬度坐标 [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 40)] public string Name; //Name[40]; //名称 public long PointID; //点的ID号 public long TypeCode; //客户不使用该字段 } #endregion public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { MY_STRUCT[] arr = new MY_STRUCT[2]; MY_STRUCT np = new MY_STRUCT(); np.x = 114.123456; np.y = 23.56789; np.Name = "珠海市政府"; np.PointID = Convert.ToInt64(1234); np.TypeCode = Convert.ToInt64(65); arr[0] = np; np = new MY_STRUCT(); np.x = 115.123456; np.y = 24.56789; np.Name = "珠海市政府2"; np.PointID = Convert.ToInt64(1235); np.TypeCode = Convert.ToInt64(66); arr[1] = np; int structSize = Marshal.SizeOf(typeof(MY_STRUCT)); byte[] temp = new byte[structSize * arr.Length]; byte[] temp1 = Struct2Byte(arr[0]); byte[] temp2 = Struct2Byte(arr[1]); Array.Copy(temp1, 0, temp, 0, temp1.Length); Array.Copy(temp2, 0, temp, structSize, temp2.Length); WriteInfo(temp); } public void WriteInfo(byte[] bt) { if (File.Exists(filename)) { File.Delete(filename); return; } FileStream fs = new FileStream(filename, FileMode.Create); BinaryWriter bw = new BinaryWriter(fs); bw.Write(bt); bw.Flush(); bw.Close(); fs.Close(); MessageBox.Show("保存成功!"); } public byte[] ReadInfo(string file) { FileStream fs = new FileStream(file, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bt = br.ReadBytes(144); br.Close(); fs.Close(); return bt; } private void button2_Click(object sender, EventArgs e) { byte[] bt = ReadInfo(filename); int structSize = Marshal.SizeOf(typeof(MY_STRUCT)); int num = bt.Length / structSize; for (int i = 0; i < num; i++) { byte[] temp = new byte[structSize]; Array.Copy(bt, i * structSize, temp, 0, structSize); MY_STRUCT np = new MY_STRUCT(); np = Byte2Struct(temp); } } private MY_STRUCT Byte2Struct(byte[] arr) { int structSize = Marshal.SizeOf(typeof(MY_STRUCT)); IntPtr ptemp = Marshal.AllocHGlobal(structSize); Marshal.Copy(arr, 0, ptemp, structSize); MY_STRUCT rs = (MY_STRUCT)Marshal.PtrToStructure(ptemp, typeof(MY_STRUCT)); Marshal.FreeHGlobal(ptemp); return rs; } private byte[] Struct2Byte(MY_STRUCT s) { int structSize = Marshal.SizeOf(typeof(MY_STRUCT)); byte[] buffer = new byte[structSize]; //分配结构体大小的内存空间 IntPtr structPtr = Marshal.AllocHGlobal(structSize); //将结构体拷到分配好的内存空间 Marshal.StructureToPtr(s, structPtr, false); //从内存空间拷到byte数组 Marshal.Copy(structPtr, buffer, 0, structSize); //释放内存空间 Marshal.FreeHGlobal(structPtr); return buffer; } } } |
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