Question

您好我已经取得了一些进展我将信息从文本文件写入二进制文件，但现在我无法将其从二进制文件显示到控制台。知道我做错了什么。我尝试过很多东西。我一直在网上查找东西。这是我用于主要目标的代码。

int main(){

ifstream("Input2.txt");
primary.writePrimary();
secondary.writeSecondary();
int input = 0;
// the main function will be used to display the main menu on screen
while (input != 8){
    std::cout << "Main Menu" << endl
        << "1---Add a Record" << endl
        << "2---Change a record" << endl
        << "3---Delete a record" << endl
        << "4---Print a record or records" << endl
        << "5---Sell a Title" << endl
        << "6---Sold value" << endl
        << "7---Build binary file" << endl
        << "8---Quit" << endl;


    std::cout << "Choose a number: ";
    cin >> input;
    // here are the cases based on what number is entered
    switch (input){
    case 1:
        addRecord();
        break;
    case 2:

        editRecord();
        break;
    case 3:
        remove();
        break;
    case 4:
        printRecord();
    case 5:
        sellRecord();
        break;
    case 6:
        soldValue();
        break;
    case 7:
        makefile();
        break;
    case 8:
        primary.writePrimary();
        secondary.writeSecondary();
        system("exit");
        break;
    }
}
system("pause");
};

     void printRecord(){
int input = 0;
while (input != 7){
    std::cout << "1---Print Record alphebetically" << endl
        << "2---Print record reverse alphabetically" << endl
        << "3---Print by title " << endl
        << "4---Print by type" << endl
        << "5---Print by sorted year ascending order" << endl
        << "6---Print Summary" << endl
        << "7---Go back" << endl;

    std::cout << "Choose a number: ";
    cin >> input;
    // here are the cases based on what number is entered
    switch (input){
    case 1:
        show();
        break;
    case 2:

        break;
    case 3:
        printbyTitle();
        break;
    case 4:

        break;
    case 5:
        break;
    case 6:
        break;
    case 7:
        system("CLS");
        return;
        break;
    }
}
}
void addRecord(){
system("CLS"); //clears screen

fstream fout;
Data inv;
char ch;

fout.open("output.bin", ios::out | ios::binary | ios::app);

do
{
    inv = EnterInventory();

    //write record to file
    fout.write(reinterpret_cast<char*>(&inv), sizeof(inv));
    system("Pause");
    std::cout << "Do you want to add another record? " << endl;
    cin >> ch;
} while (tolower(ch) == 'y');

//close the file
fout.close();
if (tolower(ch) == 'n'){
    return;
}

}
       void editRecord(){
system("CLS");

int x;
Data inv;
fstream fout;

fout.open("output.bin", ios::in | ios::binary);
fout.seekg(0, ios::end);
int count = fout.tellg() / sizeof(inv);
std::cout << "\n There are " << count << " record in the file";
std::cout << "\n Enter Record Number to edit: ";
cin >> x;

fout.seekg((x - 1)*sizeof(inv));
fout.read(reinterpret_cast<char*>(&inv), sizeof(inv));

std::cout << "Record " << x << " has following data: " << endl;

PrintInventory(inv);

fout.seekp((x - 1)*sizeof(inv));

std::cout << "\nEnter data to Modify: " << endl;
inv = EnterInventory();
fout.write(reinterpret_cast <char*>(&inv), sizeof(inv));

    }
void sellRecord(){
system("CLS");

Data inv;
fstream fout;
int x;//to hold the record number the user wishes to sell

fout.open("output.bin", ios::in | ios::out | ios::binary);
fout.seekg(0, ios::end);
int count = fout.tellg() / sizeof(inv);
cout << "\n There are " << count << " record in the file";
cout << "\n Enter Record Number to sell: ";
cin >> x;

fout.seekg((x - 1)*sizeof(inv));
fout.read(reinterpret_cast<char*>(&inv), sizeof(inv));

cout << "Selected entry:\n";

PrintInventory(inv);

int yes;

cout << "Is this correct?\n1. Yes\n2. No\n>";

cin >> yes;

if (yes == 1)
{
    inv.count--;

    Data::sum += inv.price;
    Data::sold += 1;

    fout.seekp((x - 1) * sizeof(inv));

    fout.write((char*)&inv, sizeof(inv));

    cout << "SOLD!" << endl;

    system("pause");
    system("CLS");
    return;

}
system("pause");
}
void soldValue(){
system("CLS");

Data inv;
fstream fout;
int x; //to display the value of sold records
fout.open("output.bin", ios::in | ios::out | ios::binary);
fout.seekg(0, ios::end);
int count = fout.tellg() / sizeof(inv);
cout << "\n There are " << count << " record in the file";
cout << "\nThe total value of the " << Data::sold << " records sold are: $" << Data::sum << endl;

system("PAUSE");

}

按标题打印功能只按标题打印

}
void printbyTitle(){

ifstream titl("primary.txt");
if (!titl.is_open()){
    std::cout << "file not found" << endl;
    return;
}
while (!titl.eof()){
    string title;
    int key = 0;
    std::cout << title << " " << key << endl;
    titl >> title >> key;
}
}

这将从列表中删除一行。

 void remove()
     {
system("CLS");

Data inv;
fstream fout;
int x;//to hold the record number the user wishes to delete

fout.open("output.bin", ios::in | ios::out | ios::binary);
fout.seekg(0, ios::end);
int count = fout.tellg() / sizeof(inv);
std::cout << "\n There are " << count << " record in the file";
std::cout << "\n Enter Record Number to delete: ";
cin >> x;

fout.seekg((x - 1)*sizeof(inv));
fout.read(reinterpret_cast<char*>(&inv), sizeof(inv));

inv.dead_flag = true;

fout.seekp(fout.tellg() - fstream::pos_type(sizeof(Data)));;  

fout.write(reinterpret_cast<char*>(&inv), sizeof(inv));

fout.close();


}

这是我用来让它在控制台上显示二进制文件信息的函数

 void show(){
system("CLS");

Data inv;
fstream fout;



fout.open("output.bin", ios::binary | ios::in);
fout.clear();
fout.read((char*)&inv, sizeof(inv));
int tag = 1;
while (fout.good() && !fout.eof())
{
    PrintInventory(inv);

    fout.read((char*)&inv, sizeof(inv));

}

fout.close();

system("PAUSE");


 }

任何想法我应该做什么？

让它显示二进制文件中的信息

0 个答案: