Linux 上的 .NET Core - 元帅结构

.NET Core on Linux - Marshal structures

本文关键字:结构 Core 上的 NET Linux      更新时间:2023-10-16

我有一个.NET Core控制台应用程序,可以从C++库中调用一些函数。我试图调用的函数 simpty 在某些settings中获取并将结果输出到result中。

C++:

struct settings
{
char* input_path;
char* first_file;
char* second_file;
char* mask;
char* log_path;
int count_accepted;
double confidence;
char* device;
};
struct result
{
int count;
foo* foos;
bool is_preprocessed;
double duration;
};
bool process_input(const settings& settings, result* result);

C#:

[StructLayout(LayoutKind.Sequential)]
public struct Settings
{
[MarshalAs(UnmanagedType.LPStr)]
public string input_path;
[MarshalAs(UnmanagedType.LPStr)]
public string first_file;
[MarshalAs(UnmanagedType.LPStr)]
public string second_file;
[MarshalAs(UnmanagedType.LPStr)]
public string mask;
[MarshalAs(UnmanagedType.LPStr)]
public string log_path;
[MarshalAs(UnmanagedType.I4)]
public int count_accepted;
[MarshalAs(UnmanagedType.R8)]
public double confidence;
[MarshalAs(UnmanagedType.LPStr)]
public string device;
}
[StructLayout(LayoutKind.Sequential)]
public struct Result
{
[MarshalAs(UnmanagedType.I4)]
public int count;
[MarshalAs(UnmanagedType.SysInt)]
public IntPtr foos;
[MarshalAs(UnmanagedType.I1)]
public bool is_preprocessed;
[MarshalAs(UnmanagedType.R8)]
public double duration;
}
[DllImport("myLib", EntryPoint = "process_input", CallingConvention = CallingConvention.Cdecl)]
[return:MarshalAs(UnmanagedType.I1)]
public static extern bool ProcessInput(Settings settings, out Result result);

这一切都在Windows上运行良好,但在Linux上不起作用。当我在C++面(从process_input(打印设置时,我在 int 和 double 属性中得到完全不同的值,并且在尝试访问 char* 属性时出现分段错误。

我还尝试从C++代码(Windows和Linux(调用此库,它按预期工作。据我了解,这是一个编组问题,但我自己无法确定。我是一名 C# 开发人员,对 C++、PInvoke 或 Linux 没有太多经验。

我使用Windows 10(x64(和Ubuntu 16.04(x64(。

正如David Heffernan在评论中建议的那样,我添加了一个明确的ref关键字,它起作用了。

这是我之前的函数签名:

public static extern bool ProcessInput(Settings settings, out Result result);

之后:

public static extern bool ProcessInput(ref Settings settings, out Result result);