C++ 库的 C# 绑定(bind)

Question

我已经为 libpostal 库 ( link to LibPostalNet ) 创建了一个 c# 绑定(bind)。

我使用 CppSharp 创建绑定(bind)。它有效，但我不知道如何转换此代码:

typedef struct libpostal_address_parser_response
{
    size_t num_components;
    char** components;
    char** labels;
}
libpostal_address_parser_response_t;

CppSharp 以这种方式转换代码:

public sbyte** Components
{
    get
    {
        return (sbyte**)((global::LibPostalNet.LibpostalAddressParserResponse.__Internal*)__Instance)->components;
    }

    set
    {
        ((global::LibPostalNet.LibpostalAddressParserResponse.__Internal*)__Instance)->components = (global::System.IntPtr)value;
    }
}

public sbyte** Labels
{
    get
    {
        return (sbyte**)((global::LibPostalNet.LibpostalAddressParserResponse.__Internal*)__Instance)->labels;
    }

    set
    {
        ((global::LibPostalNet.LibpostalAddressParserResponse.__Internal*)__Instance)->labels = (global::System.IntPtr)value;
    }
}

代码应该返回一个长度为 num_components 的字符串数组。

你能帮我解决这个问题吗？

Answer 1

这有点复杂，因为它们是指向字符指针列表的指针，非常类似于字符串数组。

您需要迭代指针、检索内部指针并将其转换为字符串(我假设您可以使用非托管代码):

libpostal_address_parser_response response = (retrieve from the library);

List<string> components = new List<string>();
List<string> labels = new List<string>();

//Not sure the name of num_components as you haven't added it to the question
//check if the name is correct
for(int buc = 0; buc < response.NumComponents; buc++)
{
    sbyte* pLabel = response.Labels[buc];
    sbyte* pComponent = response.Components[buc];

    labels.Add(Marshal.PtrToStringAuto((IntPtr)pLabel));
    components.Add(Marshal.PtrToStringAuto((IntPtr)pComponent));
}

//Now you have the components and the labels in their respective lists ready for usage.