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[英]How to create structure at runtime and convert byte[] pointer to created structure?
[英]how to convert byte pointer to structure
我在將字節指針轉換為結構時遇到麻煩(雖然當字節指針作為參數時它隱式工作,但從不強制轉換為新對象)
假設我有
[StructLayout(LayoutKind.Sequential)]
public struct x
{
public y;
public zType;
}
這是一個順序結構,將表示一個byte [],因此當我可以將該byte []分配給此結構並像xy一樣使用它時,不必擔心偏移量
我的問題是,當我將字節指針byte * ptr = byte []傳遞給具有此結構作為參數的方法時,它可以工作,但是當我嘗試將其正常轉換時,它不起作用
//this example works fine
{
byte[] myByteArray = new byte[];
fixed (byte* ptr = myByteArray)
someMethod(ptr)
}
someMethod(x myStruct)
//the next example however doesn't work
{
byte[] myByteArray = new byte[];
fixed (byte* ptr = myByteArray)
x myStruct = (myStruct)ptr
}
我希望我有道理,知道如何投射嗎?
重載隱式運算符,如下所示
public unsafe static implicit operator X (byte* ptr)
{
var myX = new x();
x.y = *((type*)(ptr + offset));
return myX;
}
也將byte []運算符重載為類似
public unsafe static implicit operator byte[] (X myX)
{
var myBuffer = new byte[size];
fixed(byte* ptr = myBuffer)
{
*((type*)(ptr + offset)) = myX.y;
}
return myBuffer;
}
現在您幾乎可以執行以下操作
byte[] B = new byte[];
fixed(byte* ptr = B)
{
X myX = ptr;
byte[] C = X;
}
我不確定這是否是您想要的,但是是這樣的;
using System.Runtime.InteropServices;
namespace ConsoleApplication1
{
class Program
{
[StructLayout(LayoutKind.Sequential)]
public struct x
{
public byte y;
public byte zType;
}
static unsafe void Main(string[] args)
{
var myByteArray = new byte[4];
myByteArray[0] = 1;
myByteArray[1] = 2;
myByteArray[2] = 3;
myByteArray[3] = 4;
fixed (byte* ptr = myByteArray)
{
var myStruct = (x*)ptr;
//myStruct now contain
//myStruct.y == 1
//myStruct.ztype == 2
}
}
}
}
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