struct、byte[]互相轉換

//struct轉換為byte[]
public static byte[] StructToBytes(object structObj)
{int size = Marshal.SizeOf(structObj);IntPtr buffer = Marshal.AllocHGlobal(size);try{Marshal.StructureToPtr(structObj, buffer, false);byte[] bytes = new byte[size];Marshal.Copy(buffer, bytes, 0, size);return bytes;}finally{Marshal.FreeHGlobal(buffer);}
}//byte[]轉換為struct
public static object BytesToStruct(byte[] bytes, Type type)
{int size = Marshal.SizeOf(type);IntPtr buffer = Marshal.AllocHGlobal(size);try{Marshal.Copy(bytes, 0, buffer, size);return Marshal.PtrToStructure(buffer, type);}finally{Marshal.FreeHGlobal(buffer);}
}

Intptr、byte[]互相轉換

//IntPtr轉byte[] 
IntPtr y=new IntPtr();
byte[] ys = new byte[yLength];
Marshal.Copy(y, ys, 0, yLength);//IntPtr轉byte[]
private byte[] IntPtrToByte(IntPtr unmanagedMemory, int dataSize)
{byte[] managedArray = new byte[dataSize];try{// 復制托管數組的內容到非托管內存Marshal.Copy(managedArray, 0, unmanagedMemory, managedArray.Length);}catch (Exception ex){// 處理任何異常，比如內存不足等Console.WriteLine($"Error: {ex.Message}");return managedArray;}return managedArray;
}//byte[]轉換為Intptr
public static Intptr BytesToIntptr(byte[] bytes)
{int size = bytes.Length;IntPtr buffer = Marshal.AllocHGlobal(size);try{Marshal.Copy(bytes, 0, buffer, size);return buffer;}finally{Marshal.FreeHGlobal(buffer);}
}//輸入byte[]，返回IntPtr ，不使用Marshal創建新的堆，節省內存開銷，也避免忘記釋放導致的問題
private IntPtr ArrToPtr(byte[] array)
{return System.Runtime.InteropServices.Marshal.UnsafeAddrOfPinnedArrayElement(array, 0);
}

byte[]、byte*互相轉換

//從byte*轉byte[]
byte[] barr = new byte[10];
byte* bp = (byte*)Marshal.AllocHGlobal(10);
for (int i = 0; i < 10; i++)bp[i] = (byte)i;
Marshal.Copy((IntPtr)bp, barr, 0, 10);
PrintArray(barr);
Marshal.FreeHGlobal((IntPtr)bp);//從byte[]到byte*
byte[] barr = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
byte* bp = (byte*)Marshal.AllocHGlobal(5);
PrintPtr(bp, 5);
Marshal.Copy(barr, 3, (IntPtr)bp, 5);
PrintPtr(bp, 5);
Marshal.FreeHGlobal((IntPtr)bp);static void PrintPtr(byte* bp,int n)
{for(int i=0;i<n;++i)Console.Write(bp[i] + " ");Console.WriteLine();
}

其他請參考

https://www.cnblogs.com/jhlong/p/5715015.html

https://www.cnblogs.com/castor-xu/p/14719493.html

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