Question

我已经使用了这个C-C＃代码：

·H

typedef struct {

  float a;
  float b;

} MyStruct;

extern MyStruct mystruct;

__declspec(dllexport) void  GetMyStruct (MyStruct* s);
__declspec(dllexport) void  SetMyStruct (MyStruct* s);

.C

    MyStruct mystruct;

    void GetMyStruct (MyStruct* s)
    {

        *s = AeroLink_IOPkt;
    }

    void SetMyStruct (MyStruct* s)
    {

        AeroLink_IOPkt = *s; 
    }

void test()
{
   // some code that update element in struct
   // mystruct.a = 0.4;
   // mystruct.a = 0.1;
}

的.cs

public struct MyStruct
{

  public float a;
  public float b;

} 


[DllImport(DLL_NAME, EntryPoint = "GetMyStruct")]
protected static extern void GetMyStruct(ref MyStruct s);

[DllImport(DLL_NAME, EntryPoint = "SetMyStruct")]
protected static extern void SetMyStruct(ref MyStruct s);

这样，每当我需要将数据从C＃设置为C时，我必须调用void SetMyStruct，反之亦然，如果我想从C（从void test更新）获取数据到C＃我必须调用{ {1}}。我必须每秒做50次。

有没有办法避免每次都致电GetMyStruct和SetMyStruct？我想一次使用GetMyStruct，然后将所有更改反映出来。我不知道这是否可能。

Answer 1

您可以使用unsafe和指针执行此操作。

你需要编译你的C＃程序＆＃34;不安全＆＃34;启用。

编辑：更好的方法：

向库中添加以下功能：

__declspec(dllexport) void  GetMyStructRef (MyStruct** s);
void GetMyStructRef(MyStruct** s)
{
    *s = &mystruct;
}

在C＃中：

[DllImport(DLL_NAME, EntryPoint = "GetMyStructRef")]
protected static extern void GetMyStructRef(ref MyStruct* s);

MyStruct* data;
GetMyStructRef(ref data);
Console.WriteLine($"{data->a} {data->b}");

旧答案：

unsafe class MyClass : IDisposable
{
    [DllImport(DLL_NAME, EntryPoint = "GetMyStruct")]
    protected static extern void GetMyStruct(MyStruct* s);

    [DllImport(DLL_NAME, EntryPoint = "SetMyStruct")]
    protected static extern void SetMyStruct(MyStruct* s);

    GCHandle handle;
    MyStruct* structRef;

    public void MyClass()
    {
        //we need to get a pinned reference to your struct
        handle = GCHandle.Alloc(new MyStruct(), GCHandleType.Pinned);
        structRef = (MyStruct*)handle.AddrOfPinnedObject().ToPointer();

        SetMyStruct(structRef);
    }

    public void Dispose()
    {
        //We need to free the handle to release memory
        //GC will not collect it without this
        handle.Free();
    }
}

C＃编组C结构

1 个答案: