帮我把 C++ 结构转换成 C#

Posted 2023-02-22

【中文标题】帮我把 C++ 结构转换成 C#

【英文标题】：Help me convert C++ structure into C#

【发布时间】：2010-02-08 19:12:53

【问题描述】：

我对 C# 完全陌生，需要帮助将 C++ 结构转换为 C#。 C++结构如下：

#define QUE_ADDR_BUF_LENGTH 50
#define QUE_POST_BUF_LENGTH 11

typedef struct
    
    const WCHAR *streetAddress;
    const WCHAR *city;
    const WCHAR *state;
    const WCHAR *country;
    const WCHAR *postalCode;
 QueSelectAddressType;

typedef struct
    
    WCHAR   streetAddress[QUE_ADDR_BUF_LENGTH + 1];
    WCHAR   city[QUE_ADDR_BUF_LENGTH + 1];
    WCHAR   state[QUE_ADDR_BUF_LENGTH + 1];
    WCHAR   country[QUE_ADDR_BUF_LENGTH + 1];
    WCHAR   postalCode[QUE_POST_BUF_LENGTH + 1];
     QueAddressType;

我无法更改 C++ 结构，因为它们是由我尝试与之交互的 API 定义的。任何帮助将不胜感激。

编辑： 这里有更多信息，我试图调用的 dll 中的函数声明如下：

#ifdef QUEAPI_EXPORTS
#define QueAPIExport __declspec(dllexport)
#elif defined QUEAPI_SERVER
#define QueAPIExport
#else
#define QueAPIExport __declspec(dllimport)
#endif

#ifdef __cplusplus
extern "C" 
#endif

typedef uint32 QuePointHandle;

QueAPIExport QueErrT16 QueCreatePointFromAddress
    (
    QueSelectAddressType*   addr,   // in:  Address data to search on.
    QuePointHandle*         point   // out: Handle to selected point. Must be closed with QueClosePoint.
    );

这是我定义 DllImport 的方式：

[DllImport("QueAPI.DLL", EntryPoint = "QueCreatePointFromAddress")]
public static unsafe extern QueTypesnConst.QueErrT16 QueCreatePointFromAddress(QueTypesnConst.QueSelectAddressType *address, uint *point);

编辑2： 以下代码块是该问题的解决方案： 对于结构：

[StructLayout(LayoutKind.Sequential)]
public struct QueSelectAddressType

    [MarshalAsAttribute(UnmanagedType.LPWStr)]
    public string streetAddress;
    [MarshalAsAttribute(UnmanagedType.LPWStr)]
    public string city;
    [MarshalAsAttribute(UnmanagedType.LPWStr)]
    public string state;
    [MarshalAsAttribute(UnmanagedType.LPWStr)]
    public string country;
    [MarshalAsAttribute(UnmanagedType.LPWStr)]
    public string postalCode;
;

[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Unicode)]
public struct QueAddressType

    [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst=51)]
    public string streetAddress;
    [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 51)]
    public string city;
    [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 51)]
    public string state;
    [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 51)]
    public string country;
    [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 12)]
    public string postalCode;
;

对于 DllImport：

[DllImport("QueAPI.DLL", EntryPoint = "QueCreatePointFromAddress")]
public static extern QueTypesnConst.QueErrT16 QueCreatePointFromAddress(ref QueTypesnConst.QueSelectAddressType address, ref uint point);

【问题讨论】：

你关心大小还是可以只使用字符串？

我相信尺寸很重要，但我不能确定

【参考方案1】：

试试下面的定义

public partial class NativeConstants 

    /// QUE_ADDR_BUF_LENGTH -> 50
    public const int QUE_ADDR_BUF_LENGTH = 50;

    /// QUE_POST_BUF_LENGTH -> 11
    public const int QUE_POST_BUF_LENGTH = 11;


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

    /// WCHAR*
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
    public string streetAddress;

    /// WCHAR*
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
    public string city;

    /// WCHAR*
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
    public string state;

    /// WCHAR*
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
    public string country;

    /// WCHAR*
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
    public string postalCode;


[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential, CharSet=System.Runtime.InteropServices.CharSet.Unicode)]
public struct QueAddressType 

    /// WCHAR[51]
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst=51)]
    public string streetAddress;

    /// WCHAR[51]
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst=51)]
    public string city;

    /// WCHAR[51]
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst=51)]
    public string state;

    /// WCHAR[51]
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst=51)]
    public string country;

    /// WCHAR[12]
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst=12)]
    public string postalCode;

【讨论】：

@JaredPar：您可能需要在属性中包含 SizeConst...即SizeConst = NativeConstants.QUE_ADDR_BUF_LENGTH

@tommieb75，它确实在需要它的结构上包含 SizeConst 修饰符。由于代码非常长，您必须向右滚动

我已对原帖进行了编辑，这可能有助于确定答案。

这行得通。感谢您的帮助。我会用正确的解决方案更新帖子。

【参考方案2】：

public struct QueSelectAddressType

    public readonly string StreetAddress;
    public readonly string City;
    public readonly string State;
    public readonly string Country;
    public readonly string PostalCode;

    public QueSelectAddressType(string street, string  city, string state, string country, string code)

    this.StreetAddress = street;
    this.City = city;
    this.State = state;
    this.Country = country;
    this.PostalCode = code;



public struct QueAddressType

    char[] streetAddress = new char[QUE_ADDR_BUF_LENGTH + 1];
    char[] city = new char[QUE_ADDR_BUF_LENGTH + 1];
    char[] state = new char[QUE_ADDR_BUF_LENGTH + 1];
    char[] country = new char[QUE_ADDR_BUF_LENGTH + 1];
    char[] postalCode = new char[QUE_POST_BUF_LENGTH + 1];

【讨论】：

@taylonr：我认为这行不通，因为您不能在结构中使用初始化程序...

不确定，MSDN (msdn.microsoft.com/en-us/library/aa288208(VS.71).aspx) 简单地说：结构不能具有以下形式的初始化程序：base（参数列表）。但我不这样做。授予 JaredPar 上面的那个更好......我认为他在我打字时提交了