c# - C++ DLL 和 C# Unity 之间的集成

Question

我在使用 C++ Dll 与 Unity 集成时遇到问题。我在网上找到了一些代码(文章末尾的链接)，但它不起作用。

这是我的C++ DLL代码(我想给unity发送一个有一些点的结构):

struct Pontos {
int i;
float f;
};
Pontos **pontos;
DllExport bool SetPoints(Pontos *** a, int *i)
{

    pontos = new Pontos*[4];
    for (int j = 0; j < 4; j++) {
            pontos[j] = new Pontos; // Actually create each object.
            pontos[j]->i = j;
            pontos[j]->f = (float)j;
        }
        *a = pontos;
        *i = 4;
        return true;
    }

从统一代码中，我得到以下错误:

No MonoBehaviour scripts in the file, or their names do not match the file name

我不知道这是什么意思。在这里，我尝试获取这些点并将它们保存在 c# 中:

[DllImport("dll")]
private static extern bool SetPoints(out IntPtr ptrResultVerts, out int resultVertLength);
public struct Pontos
{
    int i;
    float f;
};     
void Start()
{ 
    IntPtr ptrNativeData = IntPtr.Zero;
    int itemsLength = 0;

    bool success = SetPoints(out ptrNativeData, out itemsLength);
    if (!success)
    {
        return;
    }

    Pontos[] SArray = new Pontos[itemsLength];  // Where the final data will be stored.
    IntPtr[] SPointers = new IntPtr[itemsLength];

    Debug.Log("Length: " + itemsLength); // Works!
    Marshal.Copy(ptrNativeData, SPointers, 0, itemsLength); // Seems not to work.

    for (int i = 0; i < itemsLength; i++)
    {
        Debug.Log("Pointer: " + SPointers[i]);
        SArray[i] = (Pontos)Marshal.PtrToStructure(SPointers[i], typeof(Pontos));
    }

我从 Can't marshal array of stucts from C++ to C# in Unity 得到了这段代码.

Answer 1

您必须导入指定调用约定的dll

[DllImport("MyDLL.dll", CallingConvention = CallingConvention.Cdecl)]

我认为没有错误

No MonoBehaviour scripts in the file, or their names do not match the file name

与您的代码有任何关系。检查您的类(class)名称和脚本名称。它们对应吗？

最后，我不确定方法签名中的 out 修饰符，因为我从不需要在 C++ 端处理三重指针。如果您的目标是填充 Pontos 结构数组，那么您不需要它。

另见 Pass structure (or class) from C++ dll to C# (Unity 3D)