Question

由于某种原因，它取代了文本文件而不是推送它。所以我们有这个例子：

#include<iostream>
#include<string>
#include<fstream>


void puttingToText(
  std::string things[3],
  double thingsPoints[3]
  ){
    std::ofstream Thefile("players.txt");
    for(int i=0; i<=2; i++){
      Thefile << things[i] << " : " << thingsPoints[i] << std::endl;
    }

  }

void printingItems(


    std::string arrayHelpfull[3],
    double arrayHelpfullPoints[3],
    std::string arrayNone[3],
    double arrayNonePoints[3],
     std::string arrayHarmfull[3],
     double arrayHarmfullPoints[3],
    std::string option

    ) {
    std::cout << option << std::endl;

    if(option.compare("Plain") == 0){
      std::cout << arrayNone[0]
                  << " : "
                   << arrayNonePoints[0]
                   <<std::endl
                   << arrayNone[1]
                  << " : "
                   << arrayNonePoints[1]
                   <<std::endl
                   << arrayNone[2]
                  << " : "
                   << arrayNonePoints[2]
                   <<std::endl;

         puttingToText(arrayNone,arrayNonePoints);

    }
    else if(option.compare("Helpfull") == 0){

      std::cout << arrayHelpfull[0]
                  << " : "
                   << arrayHelpfullPoints[0]
                   <<std::endl
                   << arrayHelpfull[1]
                  << " : "
                   << arrayHelpfullPoints[1]
                   <<std::endl
                   << arrayHelpfull[2]
                  << " : "
                   << arrayHelpfullPoints[2]
                   <<std::endl;

      puttingToText(arrayHelpfull,arrayHelpfullPoints);
    }
    else{

          std::cout << arrayHarmfull[0]
                  << " : "
                   << arrayHarmfullPoints[0]
                   <<std::endl
                   << arrayHarmfull[1]
                  << " : "
                   << arrayHarmfullPoints[1]
                   <<std::endl
                   << arrayHarmfull[2]
                  << " : "
                   << arrayHarmfullPoints[2]
                   <<std::endl;
        puttingToText(arrayHarmfull,arrayHarmfullPoints);
    }

}


int main(){
  std::string arrayHelpfull[3] = {"fruits", "soda" , "candy"};
  double arrayHelpfullPoints[3] = {20.4,50.2,30.0};

    std::string arrayNone[3] = {"chair", "shoe" , "pencil"};
  double arrayNonePoints[3] = {0,0,0};

    std::string arrayHarmfull[3] = {"meth", "dirtyneedle","ninga"};
  double arrayHarmfullPoints[3] = {-20,-50,-30};

  int userChoice = 0;
    while (userChoice != 4) {

      std::cout << "1 - Just Plain Items"
            << std::endl
            << "2 - Helpfull Items"
            << std::endl
            << "3 - Harmfull Items"
            << std::endl
            << "4 - Quit"
            << std::endl;

        std::cin >> userChoice;

        switch (userChoice) {
        case 1:
            printingItems(
            arrayHelpfull, arrayHelpfullPoints, arrayNone,
              arrayNonePoints, arrayHarmfull, arrayHarmfullPoints, "Plain"
         );
            break;
        case 2:
        printingItems(
        arrayHelpfull, arrayHelpfullPoints, arrayNone,
              arrayNonePoints, arrayHarmfull, arrayHarmfullPoints, "Helpfull"
        );

            break;
        case 3:

        printingItems(
        arrayHelpfull, arrayHelpfullPoints, arrayNone,
              arrayNonePoints, arrayHarmfull, arrayHarmfullPoints, "Harmfull"
        );

            break;
        }


    }
}

你看...当我输入1例如它的剂量推动阵列，但替换它。

当我把有害的文本文件变成这样的时候：

meth : -20
dirtyneedle : -50
ninga : -30

接下来，当我把普通物品变成这样：

chair : 0
shoe : 0
pencil : 0

我想像这样推动它：

meth : -20
dirtyneedle : -50
ninga : -30
chair : 0
shoe : 0
pencil : 0

Answer 1

您需要添加以下代码行才能将追加添加到文本文件而不是替换：

TheFile.open("FileName.Ext",ios::app);

这应该有效：

  void puttingToText(
  std::string things[3],
  double thingsPoints[3]
  ){
    std::ofstream Thefile;
    Thefile.open("players.txt",ios::app);

    for(int i=0; i<=2; i++){
    Thefile << things[i] << " : " << thingsPoints[i] << std::endl;
    }

  }

Answer 2

此行std::ofstream Thefile("players.txt");打开要创建的文件，而不是附加。如果指定的文件已存在，则将其删除并覆盖。

有关详情，请参阅ofstream documentation。

替换文本文件而不是推送数据

2 个答案: