C ++在使用ofstream时，无法写入创建的文件

Question

此代码应该读取用户指定的文件（我使用6行.txt），从原始文件的底部抓取一些行并将它们粘贴到新文件中。

问题是我似乎无法写入我的archSal.txt。我已经验证读取了原始文件，创建了archSal，成功输入了要写入的循环，并且同步了iCount和iIgnore。我做错了什么？

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

using namespace std;

void CopiaFichero (int iNum, int iCount, ifstream & archEntrada)
{
    ofstream archSalida("archSal.txt");
    string linea;
    int iIgnora = (iCount - iNum) +1;

    archEntrada.clear();
    archEntrada.seekg(0, ios::beg);
    iCount = 0;
    archSalida.open("archSal.txt");

    // write loop
    while (getline(archEntrada, linea))
    {
        if (iIgnora == iCount)
        {
            archSalida << linea << endl;
            iIgnora++;
        }
      iCount++;
    }
    archSalida.close();
}

int main()
{
    int iNum = 0, iCount = 0;
    bool hayLineas = false;
    string nomArch, linea;
    ifstream archEntrada(nomArch);

    cout << "Type in the name of the file" << endl;
    cin >> nomArch;
    cout << "Type in the number of lines to copy " << endl;
    cin >> iNum;

    archEntrada.open(nomArch);

    // verify that lines to copy is less than or equal to actual lines
    do
    {
        while(getline(archEntrada, linea))
        {
            ++iCount;
        }
        if (iCount >= iNum)
        {
            hayLineas = true;
        }
        else
        {
            cout << "A copy cannot be made" << endl;
            cout << "Type in the number of lines to copy " << endl;
            cin >> iNum;
        }

    }while (hayLineas != true);

    // Call function with data
    CopiaFichero(iNum, iCount, archEntrada);

    archEntrada.close();

    return 0;
}