c++ - 从另一个函数的 "if loop"内部调用/移动一个函数 - Qt，C++

Question

我试图在 qt 中实现一个登录页面，但遇到了一个奇怪的问题。我想检查两种类型的密码。一个是常规密码，第二个是主密码。当用户输错密码5次时，他必须输入主密码，如果他还输入了3次错误密码，则会显示错误。

我已经编写了代码，但遇到了一个我无法解决的问题。这是我的登录代码:

void FormLogin::OnLogin()
{
    QString password = passLineEdit->text();

    // Checking if username or password is empty
    if (password.isEmpty())
        {QMessageBox::information(this, tr("Warning!"), "Password field is empty!");
    } else if (password == "pass")
    {this->destroy();
    } else {
    QMessageBox::information(this, tr("Warning!"), QString("Wrong password!!! Only %1 attempt(s) left!").arg(4-attempt));
    attempt++;
    if (attempt == 5){
        QMessageBox::information(this, tr("Warning!"), QString("The device is locked due to too many failed attempts. Please enter the master password to unlock the device now."));
        connect(loginButton, SIGNAL(clicked()), this, SLOT(OnMasterLogin()));
        return;}
        }       
}

void FormLogin::OnMasterLogin()
{

    QString mpassword = passLineEdit->text();

    // Checking if username or password is empty
    if (mpassword.isEmpty())
        {QMessageBox::information(this, tr("Warning!"), "MPassword field is empty!");
    } else if (mpassword == "masterpass")
    {this->destroy();
    } else {
    QMessageBox::information(this, tr("Warning!"), QString("Wrong mpassword!!! Only %1 attempt(s) left!").arg(2-master_attempt));
    master_attempt++;
    if (master_attempt == 3){
    QMessageBox::information(this, tr("Warning!"), QString("The device is permanently locked due to too many failed attempts. Please contact the device manufacturer."));}}

}

我只想在第一个函数的尝试次数等于 5 时调用第二个函数。但是在 5 个循环之后，我的代码调用了第二个函数，但它同时运行了第一个函数和第二个函数。谁能告诉我哪里做错了？我尝试将函数组合在一起，并尝试将第二个函数用作第一个函数中的嵌套循环，但即使我将它设置在“if 循环”条件中，它仍然会调用整个函数:

void FormLogin::OnLogin()
{
    QString password = passLineEdit->text();

    // Checking if username or password is empty
    if (password.isEmpty())
        {QMessageBox::information(this, tr("Warning!"), "Password field is empty!");
    } else if (password == "pass")
    {this->destroy();
    } else {
    QMessageBox::information(this, tr("Warning!"), QString("Wrong password!!! Only %1 attempt(s) left!").arg(4-attempt));
    attempt++;
    if (attempt == 5){
        QMessageBox::information(this, tr("Warning!"), QString("The device is locked due to too many failed attempts. Please enter the master password to unlock the device now."));
        QString mpassword = passLineEdit->text(); 
        // Checking if username or password is empty
        if (mpassword.isEmpty())
            {QMessageBox::information(this, tr("Warning!"), "MPassword field is empty!");
        } else if (mpassword == "masterpass")
            {this->destroy();
        } else {
            QMessageBox::information(this, tr("Warning!"), QString("Wrong mpassword!!! Only %1 attempt(s) left!").arg(2-master_attempt));
            master_attempt++;
            if (master_attempt == 3){
            QMessageBox::information(this, tr("Warning!"), QString("The device is permanently locked due to too many failed attempts. Please contact the device manufacturer."));}}}
        }       
}

使用以下代码调用第一个函数:

connect(loginButton, SIGNAL(clicked()), this, SLOT(OnLogin()));

非常感谢任何建议。

Answer 1

我假设您已经将 loginButton::clicked() 连接到 FormLogin::OnLogin()。在该方法中，尝试五次后，您添加 另一个连接到 FormLogin::OnMasterLogin()，但您仍然保留原始连接。如果当前处于“主登录”模式，请使用 disconnect() 或向 FormLogin::OnLogin() 添加逻辑以退出。