我计划将一个c ++结构数组编组到c#中,我尝试了很多方法来做到这一点,但是函数返回的数组一直都是空数组。我不知道是什么问题。这是我的C ++代码:
# include<iostream>
typedef struct
{
float x, y, z;
}cfloat3;
extern "C" __declspec(dllexport) cfloat3* Test();
extern "C" __declspec(dllexport) void freeMemory(cfloat3 * a);
cfloat3* Test()
{
cfloat3* a = new cfloat3[5];
for (int i = 0; i < 5; i++)
{
a[i].x = 1;
a[i].y = 1;
a[i].z = 1;
}
return a;
}
void freeMemory(cfloat3* a)
{
delete[] a;
}
这是我的C#代码
namespace ConsoleApp3
{
[StructLayout(LayoutKind.Sequential)]
struct cfloat3
{
public float x, y, z;
}
class Program
{
[DllImport("Dll1.dll", EntryPoint = "Test")]
public static extern IntPtr Test();
[DllImport("Dll1.dll", EntryPoint = "freeMemory")]
public static extern void freeMemory( IntPtr a);
static void Main(string[] args)
{
int length = 5;
int size = Marshal.SizeOf(typeof(cfloat3)) * length;
IntPtr pBuff = Marshal.AllocHGlobal(size);
cfloat3[] pClass = new cfloat3[length];
pBuff=Test();
IntPtr[] bb = new IntPtr[length];
Marshal.Copy(pBuff, bb, 0, length);
for (int i = 0; i < length; i++)
{
pClass[i] = (cfloat3)Marshal.PtrToStructure(bb[i],typeof(cfloat3));
Console.WriteLine(pClass[i].x);
Console.WriteLine(pClass[i].y);
Console.WriteLine(pClass[i].z);
}
Marshal.FreeHGlobal(pBuff);
Console.ReadKey();
}
}
}
运行此程序,我得到“ System.AccessViolationException:尝试读取或写入受保护的内存。这通常表明其他内存已损坏。”
您需要在每个字段中将MarshalAs
注释与SizeConst
一起使用,并分别映射到c ++结构和返回类型的C#的返回类型