上次删除时出错[]

我不明白为什么delete[] *iopszString;有错误，你能帮我解决它吗？

尝试输入：1 3 aaa

如果我省略最后一个删除[]，它都可以工作，但它没有意义，因为为了交换指针，我需要删除前一点。代码

// Notepad.cpp
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
// Method definition
void addText(char** iopszString);
void main()
{
    // Const definition
    int const ADD    = 1;
    int const UPDATE = 2;
    int const DELETE = 3;
    int const SAVE   = 4;
    int const EXIT   = 5;
    // Variable definition
    int nUserCode;
    // Code section
    // Gets the user code
    cout << "Enter the code: " << endl;
    cin >> nUserCode;
    // + "" so 1 minimum!!!
    char* iopszString = new char[1];
    iopszString = "";
    // Runs until the exit code
    while (nUserCode != EXIT)
    {
        // Checks the exit code
        switch (nUserCode)
        {
            case ADD:
            {
                addText(&iopszString);
                cout << iopszString << endl;
                break;
            }
            case UPDATE:
            {
                break;
            }
            case DELETE:
            {
                break;
            }
            case SAVE:
            {
                break;
            }
            default:
            {
                cout << "Wrong code, try again" << endl;
                break;
            }
        }
        // Gets the user code
        cout << "Enter the code: " << endl;
        cin >> nUserCode;
    }
    // Delete the string cuz heap
    delete[] iopszString;
}
void addText(char** iopszString)
{
    // Variables definition
    int  nAddLength;
    // Code section
    // Gets the new length
    cout << "Enter the length of the added string: " << endl;
    cin >> nAddLength;
    // Always remember - the length you want+1!!
    char* szNewString = new char[nAddLength+1];
    // Gets the new string
    cout << "Enter the new string which you want to add: " << endl;
    cin >> szNewString;
    // Creating a new string (result)
    char* szResult = new char[nAddLength+1+strlen(*iopszString)];
    // Copies the old string to the new
    strcpy(szResult, *iopszString);
    strcat(szResult, szNewString);
    // Deletes the new string cuz we already copied
    delete[] szNewString;
    // Exchange pointers 
    //strcpy(*iopszString, szResult); <--- never
    // The problem!
    delete[] *iopszString;
    // Exchange pointer 
    *iopszString = szResult;
}