编组包含字符串的结构 [英] marshalling a struct containing string

问题描述

我基本上想在 c# 中从用户那里获取 int 名称和字符串年龄，并将其发送到用 c 编写的 dll 方法，其中使用 int 和 char[50] 参数并返回字符串.我创建了以下场景，但我失败了，任何机构都有代码

我有一个用 c 开发的 dll，它有一个结构

struct 参数{年龄；字符名称[50];};

和方法

extern "C"{__declspec(dllexport) 参数 FillData(参数数据){参数 mydata;mydata.age=data.age;for(int i=0;i<=sizeof(data);i++){mydata.name[i]=data.name[i];}返回我的数据；}

我在 Cs_dll.cs 中的 c# 中声明它

[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Ansi)]公共结构参数{公开年龄；[MarshalAs(UnmanagedType.TBStr)]//公共字符名称；公共字符[] 名称；};公共类 Cs_Dll{[DllImport("TestLib.dll")]public static extern Argument FillData(参数数据)；}

现在又出现了一个我想做的按钮

 private void button1_Click(object sender, EventArgs e){参数数据=新参数()；data.age=Convert.ToInt32(textBox_age.Text);char[] name={'a','b','r','a','r', ' ', 'a', 'h', 'm', 'e', 'd', '' };for (int i = 0; i <= name.Length; i++){数据名称[i] = 名称[i];}//Array.Copy(name, data.name, name.Length);参数结果 = Cs_Dll.FillData(data);textBox_get.Text = result.age.ToString();textBox_age.Text = result.name.ToString();}

但我遇到了错误

解决方案

您需要将 Argument 的结构定义更改为任一

<前><代码>[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]公共结构参数{公开年龄；[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 50)]公共字符串名称；}

- 或 -

<前><代码>[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]不安全的公共结构参数{公开年龄；固定字符名称[50]；}

您可能还会发现文章字符串的默认封送处理很有帮助.

i basically want to take int name and string age from user in c# and send it to dll method written in c which take int and char[50] arguments in it and return string .i created following scenario but i am failed ,any body has the code

i have a dll developed in c which ahas a structure

struct Argument 
{
int age;
char name[50];
} ;

and a method

extern "C"
{
    __declspec(dllexport) Argument FillData(Argument data)
 {
        Argument mydata;

        mydata.age=data.age;
        for(int i=0;i<=sizeof(data);i++)
        {
            mydata.name[i]=data.name[i];

        }
        return mydata;

 }

i declare it in c# in Cs_dll.cs

[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Ansi)]
    public struct Argument
    {
        public int age;
        [MarshalAs(UnmanagedType.TBStr)]
        //public char name;
       public char[] name;

    };
  public  class Cs_Dll
    {
      [DllImport("TestLib.dll")]
            public static extern Argument FillData (Argument data);


    }

now againts a button iwant to do

 private void button1_Click(object sender, EventArgs e)
        {
            Argument data=new Argument();
            data.age=Convert.ToInt32(textBox_age.Text);
            char[] name={'a','b','r','a','r', ' ', 'a', 'h', 'm', 'e', 'd', '' };
            for (int i = 0; i <= name.Length; i++)
            {
                data.name[i] = name[i];
            }

               // Array.Copy(name, data.name, name.Length);


            Argument result = Cs_Dll.FillData(data);
            textBox_get.Text = result.age.ToString();
            textBox_age.Text = result.name.ToString();

        }

but i am stuck with error

解决方案

You need to change your struct definition of Argument to either

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct Argument
{
    public int age;

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 50)]
    public string name;
}

- or -

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
unsafe public struct Argument
{
    public int age;
    fixed char name[50];
}

You might also find the article Default Marshaling for Strings helpful.

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