C#与非托管C库之间的互操作

我在DLL中有一个小C库,我需要调用它的一些方法.

它使用指针和一些结构,但在其他方面非常简单.问题是我对.NET与非托管世界的互操作并不是非常了解,到目前为止我的尝试仍然存在内存访问冲突异常(可能是因为我没有得到指针非常正确).

有没有人能给我一些指针(哦,一个双关语！)以最好的方式来解决这个问题？

谢谢

extern vconfig_t *Pobsopen(Ppoly_t ** obstacles, int n_obstacles);


extern int Pobspath(vconfig_t * config, Ppoint_t p0, int poly0,
            Ppoint_t p1, int poly1,
            Ppolyline_t * output_route);

extern void Pobsclose(vconfig_t * config);

struct vconfig_t {
    int Npoly;
    int N;
    Ppoint_t *P;
    int *start;
    int *next;
    int *prev;
};

typedef struct Ppoly_t {
    Ppoint_t *ps;
    int pn;
} Ppoly_t;

typedef Ppoly_t Ppolyline_t;

typedef struct Pxy_t {
    double x, y;
} Pxy_t;

typedef struct Pxy_t Ppoint_t;
typedef struct Pxy_t Pvector_t;

您应该查看本MSDN杂志 article中提供的 tool,它可以将C片段转换为C#P / Invoke签名,当然还有帖子.

为您的代码段运行该工具可以为您提供：

[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]
public struct vconfig_t {

    /// int
    public int Npoly;

    /// int
    public int N;

    /// Ppoint_t*
    public System.IntPtr P;

    /// int*
    public System.IntPtr start;

    /// int*
    public System.IntPtr next;

    /// int*
    public System.IntPtr prev;
}

[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]
public struct Ppoly_t {

    /// Ppoint_t*
    public System.IntPtr ps;

    /// int
    public int pn;
}

[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]
public struct Pxy_t {

    /// double
    public double x;

    /// double
    public double y;
}

public partial class NativeMethods {

    /// Return Type: vconfig_t*
    ///obstacles: Ppoly_t**
    ///n_obstacles: int
    [System.Runtime.InteropServices.DllImportAttribute("<Unknown>", EntryPoint="Pobsopen")]
public static extern  System.IntPtr Pobsopen(ref System.IntPtr obstacles, int n_obstacles) ;


    /// Return Type: int
    ///config: vconfig_t*
    ///p0: Ppoint_t->Pxy_t
    ///poly0: int
    ///p1: Ppoint_t->Pxy_t
    ///poly1: int
    ///output_route: Ppolyline_t*
    [System.Runtime.InteropServices.DllImportAttribute("<Unknown>", EntryPoint="Pobspath")]
public static extern  int Pobspath(ref vconfig_t config, Pxy_t p0, int poly0, Pxy_t p1, int poly1, ref Ppoly_t output_route) ;


    /// Return Type: void
    ///config: vconfig_t*
    [System.Runtime.InteropServices.DllImportAttribute("<Unknown>", EntryPoint="Pobsclose")]
public static extern  void Pobsclose(ref vconfig_t config) ;

}