C# byte[]、struct、intptr、byte[]和byte*等的相互转换

struct、byte[]互相转换

cs 复制代码

//struct转换为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[]转换为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[]互相转换

cs 复制代码

//IntPtr转byte[] 
IntPtr y=new IntPtr();
byte[] ys = new byte[yLength];
Marshal.Copy(y, ys, 0, yLength);

//IntPtr转byte[]
private byte[] IntPtrToByte(IntPtr unmanagedMemory, int dataSize)
{
    byte[] managedArray = new byte[dataSize];
   
    try
    {
        // 复制托管数组的内容到非托管内存
        Marshal.Copy(managedArray, 0, unmanagedMemory, managedArray.Length);
    }
    catch (Exception ex)
    {
        // 处理任何异常，比如内存不足等
        Console.WriteLine($"Error: {ex.Message}");
        return managedArray;
    }
    return managedArray;
}


//byte[]转换为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);
    }
}

//输入byte[]，返回IntPtr ，不使用Marshal创建新的堆，节省内存开销，也避免忘记释放导致的问题
private IntPtr ArrToPtr(byte[] array)
{
   return System.Runtime.InteropServices.Marshal.UnsafeAddrOfPinnedArrayElement(array, 0);
}

byte[]、byte*互相转换

cs 复制代码

//从byte*转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);


//从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();
}

其他请参考

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

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