文本文件问题 (Visual C++)

Question

我正在尝试让程序提示用户输入文件名，然后提示他们输入要删除的单词。 有没有办法做到这一点，而无需在 main 之外创建任何功能？ （提前致谢！） 到目前为止，这是我的代码：

ofstream outFile;
string in;
char in2[800];
char fileName = ' ';
while (in != "XXXX") {
    cout << "What do you want to name the file? Enter a name or enter XXXX to quit.\n";
    cin >> in;

    for (int i = 0; i < in.length(); i++)
    {
        fileName += in[i];
    }
    outFile.open(in + ".txt");
    if (outFile.fail())
    {
        outFile << "Can't do it.";
    }
    else
    {
        cout << "What do you want in it?\n";
        cin >> in2;
        cin.getline(in2, sizeof(in2));
        outFile << in2;
    }
    outFile.close();
    ifstream reader;
    string oneLine;
    reader.open(in + ".txt");
    if (reader.fail())
    {
        cout << "Could not read file.\n";
        return 0;
    }
    else
    {
        reader.clear();
        reader.seekg(60L, ios::beg);
        getline(reader, oneLine);
        cout << "Is there something you'd like to remove from " << in << ".txt?\n";
        cin >> in2;
        ofstream write("tmp.txt");
        while (getline(reader, oneLine)) {
            if (oneLine != in2)
                write << oneLine << endl;
        }
        reader.close();
        write.close();
        remove(fileName + ".txt");
        rename("tmp.txt", fileName + ".txt");
        return 0;
    }
    return 0;
}

Answer 1

while (in != "XXXX") {
    cout << "What do you want to name the file? Enter a name or enter XXXX to quit.\n";
    ...
}

如果您输入XXXX，则循环不会退出。它将尝试处理其余的代码。

char fileName = ' '; 声明一个字符。你想要一个字符数组。更好的是，将其声明为std::string fileName;

remove(fileName + ".txt"); 不会编译，因为remove 是一个 C 函数。 C 不支持类，也不知道如何处理诸如std::string 之类的类。你想提供一个 C 字符串，你可以用 fileName.c_str() 做到这一点以下是一些建议：

int main()
{
    ofstream outFile;
    string fileName;
    string text;
    for(;;)
    {
        cout << "What do you want to name the file?\n";
        cout << "Enter a name or enter 999 to quit.\n";
        cin >> fileName;

        if(fileName == "999")
            break;

        fileName += ".txt";
        outFile.open(fileName);
        if(outFile.fail())
        {
            cout << "Can't do it.";
            continue;
        }
        else
        {
            for(;;)
            {
                cout << "What do you want in it?\n";
                cout << "Enter a name or enter 999 to stop.\n";
                cin >> text;
                if(text == "999")
                    break;
                outFile << text << endl;
            }
        }
        outFile.close();

        ifstream reader;
        reader.open(fileName);
        if(reader.fail())
        {
            cout << "Could not read file.\n";
        }
        else
        {
            cout << "Is there something you'd like to remove from " << fileName << "?\n";
            cin >> text;

            string oneLine;
            ofstream write("tmp.txt");
            while(getline(reader, oneLine)) 
            {
                if(oneLine != text)
                    write << oneLine << endl;
            }
            reader.close();
            write.close();

            remove(fileName.c_str());
            rename("tmp.txt", fileName.c_str());
            break;
        }
    }
}