如何在C ++中使用列表数组 [英] How to use list array in C++

问题描述

我从sqlite3数据库中获取品牌列表，你可以在BrandCodes函数中看到，我已经编写了新函数Brands（），我不知道如何将BRCode和BRText分配给这个结果。这是正确的方法吗？伙计们，请帮助我。我知道如何在C＃中使用。

 SortedList * Util :: BrandCodes（）
 {
 SortedList * list =  new  SortedList（）; 
 
 IDbCommand * command =  0 ; 
 IDataReader * reader =  0 ; 
 
 command = m_dbConnection-> CreateCommand（）; 
 command-> CommandText = S   SELECT * FROM BrandData; 
 reader = command-> ExecuteReader（）; 
  //  阅读所有记录 
  while （reader-> Read（））
 {
  //  将项目添加到地图[market_id，description]  
 list-> Add（reader-> Item [S   BRCode]  - > ToString（），
 字符串 ::格式（S   {0}（{1}），GetFieldValue（reader，S   BRText），GetFieldValue（reader，S   BRCode）））; 
} 
品牌（）; 
 返回列表; 
} 
 
 字符串 * FuelUtil :: Brands（） __ gc  [] 
 {
 字符串 *结果 __ gc  []; 
 result =  0 ; 
 SortedList * brandList =  0 ; 
 
  if （brandList ==  0 ）
 {
 brandList = GetBrandCodes（）; 
} 
 
  for （ int  i =  0 ; i< = brandList-> Count; i ++）
 {
 result =  new  < span class =code-sdkkeyword> String  *  __ gc  [ 2 ]; 
  //  如何将BRCode和BRText分配给此结果 
  //   result [0] =  
  //   result [1] =  
} 
 
  return 结果; 
} 

我的尝试：



我试过这种方式

  String  * FuelUtil :: Brands（） __ gc  [] 
 {
  String  * result < span class =code-keyword> __ gc  []; 
 result =  0 ; 
 SortedList * brandList =  0 ; 
 
  if （brandList ==  0 ）
 {
 brandList = GetBrandCodes（）; 
} 
 
  for （ int  i =  0 ; i< = brandList-> Count; i ++）
 {
 result =  new  < span class =code-sdkkeyword> String  *  __ gc  [ 2 ]; 
  //  如何将BRCode和BRText分配给此结果 
  //   result [0] =  
  //   result [1] =  
} 
 
  return 结果; 
} 

解决方案

首先，我不确定你是否正确行事。

看起来你正在使用托管C ++，在这种情况下你应该使用 SortedList ^ 而不是 SortedList * 和也 gcnew 而不是 new 。



你应该能够使用 - brandList->值[i];

获取for循环中的值这当然会返回一个字符串格式BRText（BRCode）就像你插入列表一样。



然后你需要拆分使用 String :: Split Method（array< char> ^）将它分成单独的字符串 [ ^ ]。

I am getting the list of brands from sqlite3 database,you can see in BrandCodes function, I have written new function Brands(), I don't know how to assign BRCode and BRText to this result. Is this the right approach. Please help me, guys. I know how to use in C#.

SortedList *Util::BrandCodes()
{
    SortedList *list = new SortedList();

    IDbCommand    *command = 0;
    IDataReader *reader = 0;

    command = m_dbConnection->CreateCommand();
    command->CommandText = S"SELECT * FROM BrandData";
    reader = command->ExecuteReader();
            // Read all records
    while( reader->Read() )
    {
        // Add item to the map [ market_id, description ]
        list->Add( reader->Item[ S"BRCode" ]->ToString(),
        String::Format(S"{0}({1})",GetFieldValue(reader,S"BRText"),GetFieldValue(reader,S"BRCode")));
    }
    Brands();
    return list;
}

String *FuelUtil::Brands( ) __gc[]
{
    String *result __gc[];
    result = 0;
    SortedList  *brandList = 0;

    if (brandList == 0)
    {
        brandList = GetBrandCodes();            
    }       

    for (int i =0; i<= brandList->Count; i++)
    {
        result = new String * __gc[2];
        // how to assign BRCode and BRText to this result
        //result[0] = 
        //result[1] = 
    }

    return result;
}

What I have tried:

I tried this way

String *FuelUtil::Brands( ) __gc[]
{
    String *result __gc[];
    result = 0;
    SortedList  *brandList = 0;

    if (brandList == 0)
    {
        brandList = GetBrandCodes();            
    }       

    for (int i =0; i<= brandList->Count; i++)
    {
        result = new String * __gc[2];
        // how to assign BRCode and BRText to this result
        //result[0] = 
        //result[1] = 
    }

    return result;
}

解决方案

Fistly, I'm not sure if you're doing this right.
Looks like you're using managed C++ in which case you should be using SortedList^ instead of SortedList* and also gcnew instead of new.

You should be able to get the value inside the for loop using - brandList->Values[i];
This would of course return a string in the format "BRText(BRCode)" like you inserted into the list.

You will then need to split it into separate strings using String::Split Method (array<char>^)[^].

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