c# - 编码包含字符串数组的结构数组-6ren

c# - 编码包含字符串数组的结构数组

转载作者：太空狗更新时间：2023-10-29 23:07:49

您好，我正在尝试从 C# 访问结构的 C++ 数组。该结构本身还包含一个字符串数组和一个字符串。详情如下。它不工作.. 不会崩溃但不会传输数据(例如，在数组中获取空值，并在结构/类的 numberOfRows 整数中获取随机数)。请参阅代码 list 末尾的评论。有什么建议吗？

c++ cppClassLib.cpp

// This is the main DLL file.



  #include "stdafx.h"
    #include <Objbase.h>

    #include "cppClassLib.h"

    #include <string.h>
    //#include <malloc.h>

    namespace cppClassLib {

    /*
    http://msdn.microsoft.com/en-us/magazine/cc164123.aspx
    http://stackoverflow.com/questions/9093292/use-a-c-library-from-c-sharp-code
    http://stackoverflow.com/questions/5671658/what-does-invalid-managed-unmanaged-type-combination-mean
    http://stackoverflow.com/questions/2338146/returning-pointers-from-unmanaged-to-managed-code
    CoTaskMemAlloc http://msdn.microsoft.com/en-us/library/windows/desktop/ms692727%28v=vs.85%29.aspx
    */

    char *createStr(char *input)
    {
        int len = strlen(input)+1;

        // can't use malloc because it needs to
        //  be accessible from another process.
        // can't use CoTaskMemAlloc because get an
        // error when trying to link, not found.
        //char *newStr = (char *)CoTaskMemAlloc(len);
        //char *newStr = (char *)malloc(len);

        char *newStr = (char *)GlobalAlloc(GPTR,len);
        //char* newStr = new char[len];
        strcpy_s(newStr, len, input);
        return newStr;
    }

    int Class1::getMatrixNumberOfRowsInColumnZero(int maxColumns, Class1::columnT *matrix)
    {
        if (maxColumns < 1) {
            return 0;
        }
        return matrix[0].numberOfRows;
    }

    int Class1::getMatrix(int maxColumns, Class1::columnT *matrix)
    {
        if (maxColumns < 2) {
            return 0;
        }
        int numberOfColumns = 2;

        //Class1::columnT *column0 = (Class1::columnT *)GlobalAlloc(GPTR,sizeof(Class1::columnT));
        Class1::columnT *column0 = &(matrix[0]);
        column0->columnName = createStr("Col0");
        int numRows = 2;
        column0->numberOfRows = numRows;
        char **rows = (char **)GlobalAlloc(GPTR,sizeof(char *)*numRows);
        rows[0] = createStr("C0R0");
        rows[1] = createStr("C0R1");
        column0->rows = rows;

        Class1::columnT *column1 = &(matrix[1]);
        //Class1::columnT *column1 = (Class1::columnT *)GlobalAlloc(GPTR,sizeof(Class1::columnT));
        column1->columnName = createStr("Col1");
        numRows = 2;
        column1->numberOfRows = numRows;
        rows = (char **)GlobalAlloc(GPTR,sizeof(char *)*numRows);
        rows[0] = createStr("C1R0");
        rows[1] = createStr("C1R1");
        column1->rows = rows;

        //matrix[0]=column0;
        //matrix[1]=column1;
        //(matrix[0])->columnName = createStr("Test0");

        return numberOfColumns; // 2
    }

    int Class1::getInt(void)
    {
        return 1234;
    }

    char* Class1::getHi(void)
    {
        //char *result = createStr("Hello");
        //return result;
        //return createStr("hello");
        return createStr("hello");
    }

    char** Class1::getHeaderList(void)
    {
        char** list;
        list = (char **)GlobalAlloc(GPTR,sizeof(char *)*2);
        list[0]=createStr("test1");
        list[1]="test2";
        return list;
    }

    int Class1::getHeaderListTwo(int maxsize, char ***result)
    {
        char** list;
        int len = 2;
        if (maxsize < len) {
            return NULL;
        }
        list = (char **)GlobalAlloc(GPTR,sizeof(char *)*maxsize);
        list[0]=createStr("test01");
        list[1]="test02";
        for (int i=2; i<maxsize; ++i) {
            list[i]="";
        }
        *result = list;
        return len;
    }

    char* Class1::getHi2(void)
    {
        return "Hi";
    }

    char* Class1::getHi3(void)
    {
        return "Hi!";
    }

    void Class1::getData(int *totalColumns,
                    char** headers[2],
                    char** items[2][3])
    {
        *totalColumns = 2;
        *headers[0]=createStr("Testing");
        *headers[1]=createStr("Pets");
        *items[0][0]=createStr("test1");
        *items[0][1]=createStr("test2");
        *items[0][2]=createStr("test3");
        *items[1][0]=createStr("Cats");
        *items[1][1]=createStr("Dogs");
        *items[1][2]=createStr("Fish");
    }

}

c++ cppClassLib.h

    // cppClassLib.h

    #pragma once

    using namespace System;

    #define DllExport   __declspec( dllexport )

    // http://msdn.microsoft.com/en-us/library/3y1sfaz2.aspx

    namespace cppClassLib {

    public class Class1 {
        public:
            struct columnT {  
                int numberOfRows;
                char **rows;
                char *columnName;
            };
            static DllExport int getMatrix(int maxColumns, columnT *matrix);
            static DllExport int getMatrixNumberOfRowsInColumnZero(int maxColumns, columnT *matrix);
            static DllExport void getData(int *totalColumns,
                    char** headers[2],
                    char** items[2][3]);
            static DllExport char *getHi(void);
            static DllExport char *getHi2(void);
            static DllExport char *getHi3(void);
            static DllExport int getInt(void);
            static DllExport char** getHeaderList(void);
            static DllExport int getHeaderListTwo(int maxsize, char ***result);
    };
}

c# Form1.cs

  using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;

    using System.Runtime.InteropServices;

    /*

    http://msdn.microsoft.com/en-us/library/aa288468%28v=vs.71%29.aspx
    http://ondotnet.com/pub/a/dotnet/2002/03/18/customcontrols.html?page=2
    http://www.codeproject.com/Articles/2995/The-Complete-Guide-to-C-Strings-Part-I-Win32-Chara
    http://msdn.microsoft.com/en-us/library/z6cfh6e6.aspx

    */

    namespace listViewFromC
    {
    public partial class Form1 : Form
    {
        /*
        [DllImport("cppClassLib.dll",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "?getInt@Class1@cppClassLib@@QAEHXZ")]
            public static extern int getInt();
        */

        // get EntryPoint using
        // "DLL Export Viewer" software

        [DllImport("cppClassLib.dll",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "?getHi2@Class1@cppClassLib@@SAPADXZ")]
            public static extern String getHi2();

        [DllImport("cppClassLib.dll",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "?getHi@Class1@cppClassLib@@SAPADXZ")]
        [return: MarshalAs(UnmanagedType.LPStr)]  
        public static extern string getHi();

        [DllImport("cppClassLib.dll",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "?getHeaderList@Class1@cppClassLib@@SAPAPADXZ")]
        [return: MarshalAs(UnmanagedType.LPArray, 
            ArraySubType=UnmanagedType.LPStr, SizeConst=2)]
        public static extern String[] getHeaderList();

        [DllImport("cppClassLib.dll",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "?getHeaderListTwo@Class1@cppClassLib@@SAHHPAPAPAD@Z")]
        public static extern int getHeaderListTwo(int maxsize,
            [MarshalAs(UnmanagedType.LPArray,
            ArraySubType = UnmanagedType.LPStr, SizeParamIndex = 0)]
            ref String[] result
            );

        [StructLayout(LayoutKind.Sequential)]  
        public class columnType
        {
            public int numberOfRows;
            [MarshalAs(UnmanagedType.LPArray,
            ArraySubType = UnmanagedType.LPStr)]
            public String[] rows;
            [MarshalAs(UnmanagedType.LPStr)]
            public String columnName;
        }  

        [DllImport("cppClassLib.dll",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "?getMatrix@Class1@cppClassLib@@SAHHPAUcolumnT@12@@Z")]
        public static extern int getMatrix(int maxColumns,
            [MarshalAs(UnmanagedType.LPArray,
            ArraySubType = UnmanagedType.Struct, SizeParamIndex = 0)]
            columnType[] matrix);

        [DllImport("cppClassLib.dll",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "?getMatrixNumberOfRowsInColumnZero@Class1@cppClassLib@@SAHHPAUcolumnT@12@@Z")]
        public static extern int getMatrixNumberOfRowsInColumnZero(int maxColumns,
            [MarshalAs(UnmanagedType.LPArray,
            ArraySubType = UnmanagedType.Struct, SizeParamIndex = 0)]
            columnType[] matrix);

        /*
        [DllImport("kernel32.dll")]
        static extern IntPtr GlobalAlloc(uint uFlags, uint dwBytes);

        const uint GMEM_FIXED = 0x0000;
        const uint GMEM_ZEROINIT = 0x0040;
        const uint GPTR = GMEM_FIXED | GMEM_ZEROINIT;
        */

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //label1.Text = getInt().ToString();
            label1.Text = getHi2();
            listView1.Items.Clear();
            listView1.Items.Add(label1.Text);
            //listView1.
        }

        private void button2_Click(object sender, EventArgs e)
        {
            label1.Text = getHi();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            const int maxsize = 2;
            String[] headerList = new String[maxsize];
            int len = getHeaderListTwo(maxsize, ref headerList);
            MessageBox.Show("Got length " + headerList.Length+" ("+len+")");
            label1.Text="";
            for (int i = 0; i < headerList.Length; ++i)
            {
                if (headerList[i].Length>0)
                {
                    label1.Text += headerList[i].ToString() + " // ";
                }
                else
                {
                    label1.Text += " // ";
                }
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            int maxColumns=5;
            int numberOfColumns = 0;
            columnType[] matrix = new columnType[maxColumns];
            for (int i = 0; i < maxColumns; ++i)
            {
                matrix[i] = new columnType();
            }
            matrix[0].numberOfRows = 1; // pick something just to see if we can get it back
            //uint sz = (uint)maxColumns*4;
            //IntPtr matrixIP = GlobalAlloc(GPTR, sz);
            //columnType[] matrix = matrixIP;

            //IntPtr pointerArr = Marshal.AllocHGlobal(maxColumns*4);

            //numberOfColumns = getMatrix(maxColumns, matrix);
            label1.Text = getMatrixNumberOfRowsInColumnZero(maxColumns,matrix).ToString();

            //label1.Text = matrix[0].columnName;
        }
    }
}

button1、button2 和 button3 单击事件工作正常，因此它表明某些 c++ 编码到 c# 的工作正常。 button4_click 不起作用。

label1.Text 应该返回 1，因为它只是返回 matrix[0].numberOfRows但实际上它返回了一些巨大的数字。

此外，如果未注释，getMatrix 调用也不起作用，它运行时不会崩溃，但数组的所有元素都为空(未填充 getMatrix 应该填充的数据)。

最佳答案

这是我的解决方案。这个解决方案的唯一怪癖是结构中需要固定长度的数组，我更喜欢可变长度的数组，但它不接受 LPArray 的 Marshall。也许这是不可能的。

我遇到的主要问题是我将其声明为类而不是结构。另一个问题是结构中的数组是 LPArray 非托管编码类型，尝试使用可变长度数组，但这没有用，因为它需要是 ByValArray(或 SafeArray)才能工作。

cpp类库.h

// cppClassLib.h

#pragma once

using namespace System;

#define DllExport   __declspec( dllexport )

// http://msdn.microsoft.com/en-us/library/3y1sfaz2.aspx

#define maxRowsCpp 100

namespace cppClassLib {

public class Class1 {
    public:
        struct columnT {  
            int numberOfRows;
            char *rows[maxRowsCpp];
            char *columnName;
        };
        struct columnT2 {  
            int numberOfRows;
        };
        static DllExport int __thiscall getMatrix(int maxColumns, int maxRows, columnT *matrix[]);
        static DllExport int __thiscall getMatrixNumberOfRowsInColumnZero(int maxColumns, columnT matrix[]);
        static DllExport int __thiscall getMatrixNumberOfRowsInColumnZero2(int maxColumns, columnT2 matrix[]);
        static DllExport void getData(int *totalColumns,
                char** headers[2],
                char** items[2][3]);
        static DllExport char *getHi(void);
        static DllExport char *getHi2(void);
        static DllExport char *getHi3(void);
        static DllExport int getInt(void);
        static DllExport char** getHeaderList(void);
        static DllExport int getHeaderListTwo(int maxsize, char ***result);
};

cpp类库.cpp

// This is the main DLL file.

#include "stdafx.h"
#include <Objbase.h>

#include "cppClassLib.h"

#include <string.h>
//#include <malloc.h>

namespace cppClassLib {

/*
http://msdn.microsoft.com/en-us/magazine/cc164123.aspx
http://stackoverflow.com/questions/9093292/use-a-c-library-from-c-sharp-code
http://stackoverflow.com/questions/5671658/what-does-invalid-managed-unmanaged-type-combination-mean
http://stackoverflow.com/questions/2338146/returning-pointers-from-unmanaged-to-managed-code
CoTaskMemAlloc http://msdn.microsoft.com/en-us/library/windows/desktop/ms692727%28v=vs.85%29.aspx
*/

char *createStr(char *input)
{
    int len = strlen(input)+1;

    // can't use malloc because it needs to
    //  be accessible from another process.
    // can't use CoTaskMemAlloc because get an
    // error when trying to link, not found.
    //char *newStr = (char *)CoTaskMemAlloc(len);
    //char *newStr = (char *)malloc(len);

    char *newStr = (char *)GlobalAlloc(GPTR,len);
    //char* newStr = new char[len];
    strcpy_s(newStr, len, input);
    return newStr;
}

int Class1::getMatrixNumberOfRowsInColumnZero(int maxColumns, Class1::columnT matrix[])
{
    if (maxColumns < 1) {
        return 0;
    }
    return (matrix[0]).numberOfRows;
}

int Class1::getMatrixNumberOfRowsInColumnZero2(int maxColumns, Class1::columnT2 matrix[])
{
    if (maxColumns < 1) {
        return 0;
    }
    return (matrix[0]).numberOfRows;
}

int Class1::getMatrix(int maxColumns, int maxRows, Class1::columnT *matrix[])
{
    // require at least able to have 2 rows and 2 columns
    if ((maxColumns < 2) || (maxRows < 2)) {
        return 0;
    }
    int numberOfColumns = 2;
    int numberOfRows = 2;
    //return matrix[0].columnName[0];

    //Class1::columnT *column0 = (Class1::columnT *)GlobalAlloc(GPTR,sizeof(Class1::columnT));
    Class1::columnT *column0 = &(*matrix[0]);
    column0->columnName = createStr("Col0");
    column0->numberOfRows = numberOfRows;
    //char **rows = (char **)GlobalAlloc(GPTR,sizeof(char *)*numRows);
    column0->rows[0] = createStr("C0R0");
    column0->rows[1] = createStr("C0R1");

    Class1::columnT *column1 = &(*matrix[1]);
    //Class1::columnT *column1 = (Class1::columnT *)GlobalAlloc(GPTR,sizeof(Class1::columnT));
    column1->columnName = createStr("Col1");
    column1->numberOfRows = numberOfRows;
    //rows = (char **)GlobalAlloc(GPTR,sizeof(char *)*numRows);
    column0->rows[0] = createStr("C1R0");
    column0->rows[1] = createStr("C1R1");

    return numberOfColumns;
}

int Class1::getInt(void)
{
    return 1234;
}

char* Class1::getHi(void)
{
    //char *result = createStr("Hello");
    //return result;
    //return createStr("hello");
    return createStr("hello");
}

char** Class1::getHeaderList(void)
{
    char** list;
    list = (char **)GlobalAlloc(GPTR,sizeof(char *)*2);
    list[0]=createStr("test1");
    list[1]="test2";
    return list;
}

int Class1::getHeaderListTwo(int maxsize, char ***result)
{
    char** list;
    int len = 2;
    if (maxsize < len) {
        return NULL;
    }
    list = (char **)GlobalAlloc(GPTR,sizeof(char *)*maxsize);
    list[0]=createStr("test01");
    list[1]="test02";
    for (int i=2; i<maxsize; ++i) {
        list[i]="";
    }
    *result = list;
    return len;
}

char* Class1::getHi2(void)
{
    return "Hi";
}

char* Class1::getHi3(void)
{
    return "Hi!";
}

void Class1::getData(int *totalColumns,
                char** headers[2],
                char** items[2][3])
{
    *totalColumns = 2;
    *headers[0]=createStr("Testing");
    *headers[1]=createStr("Pets");
    *items[0][0]=createStr("test1");
    *items[0][1]=createStr("test2");
    *items[0][2]=createStr("test3");
    *items[1][0]=createStr("Cats");
    *items[1][1]=createStr("Dogs");
    *items[1][2]=createStr("Fish");
}

c# Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Runtime.InteropServices;

/*

http://msdn.microsoft.com/en-us/library/aa288468%28v=vs.71%29.aspx
http://ondotnet.com/pub/a/dotnet/2002/03/18/customcontrols.html?page=2
http://www.codeproject.com/Articles/2995/The-Complete-Guide-to-C-Strings-Part-I-Win32-Chara
http://msdn.microsoft.com/en-us/library/z6cfh6e6.aspx

 */

namespace listViewFromC
{
public partial class Form1 : Form
{
    const int maxRows = 100;
    /*
    [DllImport("cppClassLib.dll",
    CallingConvention = CallingConvention.Cdecl,
    EntryPoint = "?getInt@Class1@cppClassLib@@QAEHXZ")]
        public static extern int getInt();
    */

    // get EntryPoint using
    // "DLL Export Viewer" software

    [DllImport("cppClassLib.dll",
    CallingConvention = CallingConvention.Cdecl,
    EntryPoint = "?getHi2@Class1@cppClassLib@@SAPADXZ")]
        public static extern String getHi2();

    [DllImport("cppClassLib.dll",
    CallingConvention = CallingConvention.Cdecl,
    EntryPoint = "?getHi@Class1@cppClassLib@@SAPADXZ")]
    [return: MarshalAs(UnmanagedType.LPStr)]  
    public static extern string getHi();

    [DllImport("cppClassLib.dll",
    CallingConvention = CallingConvention.Cdecl,
    EntryPoint = "?getHeaderList@Class1@cppClassLib@@SAPAPADXZ")]
    [return: MarshalAs(UnmanagedType.LPArray, 
        ArraySubType=UnmanagedType.LPStr, SizeConst=2)]
    public static extern String[] getHeaderList();

    [DllImport("cppClassLib.dll",
    CallingConvention = CallingConvention.Cdecl,
    EntryPoint = "?getHeaderListTwo@Class1@cppClassLib@@SAHHPAPAPAD@Z")]
    public static extern int getHeaderListTwo(int maxsize,
        [MarshalAs(UnmanagedType.LPArray,
        ArraySubType = UnmanagedType.LPStr, SizeParamIndex = 0)]
        ref String[] result
        );

    [StructLayout(LayoutKind.Sequential, Pack = 4)]
    public struct columnType
    {
        public int numberOfRows;
        // note: can't marshal rows field as LPArray must be ByValArray or SafeArray
        // for maximum of maxRows rows
        [MarshalAs(UnmanagedType.ByValArray,
        ArraySubType = UnmanagedType.LPStr,
        SizeConst=maxRows)]
        public String[] rows;
        [MarshalAs(UnmanagedType.LPStr)]
        public String columnName;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct columnType2
    {
        public int numberOfRows;
    }

    [DllImport("cppClassLib.dll",
    CallingConvention = CallingConvention.ThisCall,
    EntryPoint = "?getMatrix@Class1@cppClassLib@@SEHHHQAPAUcolumnT@12@@Z")]
    public static extern int getMatrix(int maxColumns,
        int maxRows,
        [MarshalAs(UnmanagedType.LPArray,
        ArraySubType = UnmanagedType.Struct, SizeParamIndex = 0)]
        ref columnType[] matrix);

    [DllImport("cppClassLib.dll",
    CallingConvention = CallingConvention.ThisCall,
    EntryPoint = "?getMatrixNumberOfRowsInColumnZero@Class1@cppClassLib@@SEHHQAUcolumnT@12@@Z")]
    public static extern int getMatrixNumberOfRowsInColumnZero(int maxColumns,
        [MarshalAs(UnmanagedType.LPArray,
        ArraySubType = UnmanagedType.Struct, 
        SizeParamIndex = 0)]
        columnType[] matrix);

    [DllImport("cppClassLib.dll",
    CallingConvention = CallingConvention.ThisCall,
    EntryPoint = "?getMatrixNumberOfRowsInColumnZero2@Class1@cppClassLib@@SEHHQAUcolumnT2@12@@Z")]
    public static extern int getMatrixNumberOfRowsInColumnZero2(int maxColumns,
        [MarshalAs(UnmanagedType.LPArray,
        SizeParamIndex = 0,
        ArraySubType = UnmanagedType.Struct)]
        columnType2[] matrix);

    /*
    [DllImport("kernel32.dll")]
    static extern IntPtr GlobalAlloc(uint uFlags, uint dwBytes);

    const uint GMEM_FIXED = 0x0000;
    const uint GMEM_ZEROINIT = 0x0040;
    const uint GPTR = GMEM_FIXED | GMEM_ZEROINIT;
    */

    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        //label1.Text = getInt().ToString();
        label1.Text = getHi2();
        listView1.Items.Clear();
        listView1.Items.Add(label1.Text);
        //listView1.
    }

    private void button2_Click(object sender, EventArgs e)
    {
        label1.Text = getHi();
    }

    private void button3_Click(object sender, EventArgs e)
    {
        const int maxsize = 2;
        String[] headerList = new String[maxsize];
        int len = getHeaderListTwo(maxsize, ref headerList);
        MessageBox.Show("Got length " + headerList.Length+" ("+len+")");
        label1.Text="";
        for (int i = 0; i < headerList.Length; ++i)
        {
            if (headerList[i].Length>0)
            {
                label1.Text += headerList[i].ToString() + " // ";
            }
            else
            {
                label1.Text += " // ";
            }
        }
    }

    private void button4_Click(object sender, EventArgs e)
    {
        int maxColumns=5;
        int numberOfColumns = 0;
        columnType[] matrix = new columnType[maxColumns];
        for (int i = 0; i < maxColumns; ++i)
        {
            matrix[i] = new columnType();
        }
        matrix[0].numberOfRows = 1; // pick something just to see if we can get it back
        matrix[0].columnName = "ABC";
        // numberOfRows must be less than or equal to maxRows

        columnType2[] matrix2 = new columnType2[maxColumns];
        for (int i = 0; i < maxColumns; ++i)
        {
            matrix2[i] = new columnType2();
        }
        matrix2[0].numberOfRows = 1; // pick something just to see if we can get it back

        //uint sz = (uint)maxColumns*4;
        //IntPtr matrixIP = GlobalAlloc(GPTR, sz);
        //columnType[] matrix = matrixIP;

        //IntPtr pointerArr = Marshal.AllocHGlobal(maxColumns*4);

        //int result = getMatrixNumberOfRowsInColumnZero(maxColumns,matrix);
        //label1.Text = result.ToString();

        numberOfColumns = getMatrix(maxColumns, maxRows, ref matrix);
        label1.Text = matrix[0].columnName;

    }
}
}

关于c# - 编码包含字符串数组的结构数组，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11490087/

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我是 C++ 容器模板的新手。我收集了一些记录。每条记录都有一个唯一的名称，以及一个字段/值对列表。将按名称访问记录。字段/值对的顺序很重要。因此我设计如下: typedef string
java - 谁能帮我创建方法？ mystring.replacefirst(字符串,字符串);并替换(自，直到，字符串)；对于j2me，请
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firebase - Cloud Firestore 字符串 >= 字符串
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java - 带有自定义转换器的推土机双向映射(字符串，字符串)不可能吗？
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java - 字符串 a == 字符串 b 的规则
这个问题在这里已经有了答案: How do I compare strings in Java? (23 个回答) 关闭 6 年前。我想了解字符串池的工作原理以及一个字符串等于另一个字符串的规则是
Swift 字符串 vs. 字符串!与字符串？
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这两种方法中哪一种在理论上更快，为什么？ (指向字符串的指针必须是常量。) destination[count] 和 *destination++ 之间的确切区别是什么？ destination[co
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我有一个Stream一个文件的，现在我想将相同的单词组合成 Map这很重要，这个词在 Stream 中出现的频率. 我知道我必须使用 collect(Collectors.groupingBy(..)

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