Properly close app on welcome back cancel

src/mainwindow.cpp

@@ -388,11 +388,14 @@ void MainWindow::closeEvent(QCloseEvent* event) {
     s.sync();
 
     // Let the RPC know to shut down any running service.
-    rpc->shutdownhushd();
-    int passphraselenght = DataStore::getChatDataStore()->getPassword().length();
+    if(rpc){
+        rpc->shutdownhushd();
+    }
+
+    int passphraselength = DataStore::getChatDataStore()->getPassword().length();
 
     // Check is encryption is ON for SDl
-    if(passphraselenght > 0) {
+    if(passphraselength > 0) {
         // delete old file before
 
         //auto dirHome =  QDir(QStandardPaths::writableLocation(QStandardPaths::HomeLocation));
@@ -631,25 +634,28 @@ void MainWindow::removeWalletEncryption() {
 
 void MainWindow::removeWalletEncryptionStartUp() {
     qDebug() << __func__ << ": removing wallet encryption";
-   QDialog d(this);
+    QDialog d(this);
     Ui_startup ed;
     ed.setupUi(&d);
 
-     QObject::connect(ed.new_restore, &QPushButton::clicked, [&] {
+    // Connect cancel button to close app on queued connection
+    QObject::connect(ed.buttonBox, &QDialogButtonBox::rejected, qApp, &QCoreApplication::quit, Qt::QueuedConnection);
 
-     d.close();
-     QFile wallet(dirwallet);
-     QFile walletenc(dirwalletenc);
+    // Connect new/restore button click
+    QObject::connect(ed.new_restore, &QPushButton::clicked, [&] {
 
-     wallet.remove();
-     walletenc.remove();
+        d.close();
+        QFile wallet(dirwallet);
+        QFile walletenc(dirwalletenc);
 
-       auto cl = new ConnectionLoader(this, rpc);
-       cl->loadConnection();       
-   });
-  
-    if (d.exec() == QDialog::Accepted) 
-    {
+        wallet.remove();
+        walletenc.remove();
+
+        auto cl = new ConnectionLoader(this, rpc);
+        cl->loadConnection();
+    });
+
+    if (d.exec() == QDialog::Accepted){
         QString passphraseBlank = ed.txtPassword->text(); // data comes from user inputs
 
         QString passphrase = QString("HUSH3") + passphraseBlank + QString("SDL");
@@ -666,49 +672,48 @@ void MainWindow::removeWalletEncryptionStartUp() {
         sequence1 = new char[length+1];
         strncpy(sequence1, passphraseHash.toUtf8(), length+1);
 
-        #define MESSAGE ((const unsigned char *) sequence)
-        #define MESSAGE_LEN length
-        #define hash ((const unsigned char *) sequence1)
+#define MESSAGE ((const unsigned char *) sequence)
+#define MESSAGE_LEN length
+#define hash ((const unsigned char *) sequence1)
 
-        #define PASSWORD sequence
-        #define KEY_LEN crypto_box_SEEDBYTES
+#define PASSWORD sequence
+#define KEY_LEN crypto_box_SEEDBYTES
 
-    unsigned char key[KEY_LEN];
+        unsigned char key[KEY_LEN];
 
-    if (crypto_pwhash(key, sizeof key, PASSWORD, strlen(PASSWORD), hash,
-     crypto_pwhash_OPSLIMIT_SENSITIVE, crypto_pwhash_MEMLIMIT_SENSITIVE,
-     crypto_pwhash_ALG_DEFAULT) != 0) {
-        /* out of memory */
-        qDebug() << __func__ << ": crypto_pwhash failed! Possibly out of memory";
-        return;
-    }
+        if (crypto_pwhash(key, sizeof key, PASSWORD, strlen(PASSWORD), hash,
+                          crypto_pwhash_OPSLIMIT_SENSITIVE, crypto_pwhash_MEMLIMIT_SENSITIVE,
+                          crypto_pwhash_ALG_DEFAULT) != 0) {
+            /* out of memory */
+            qDebug() << __func__ << ": crypto_pwhash failed! Possibly out of memory";
+            return;
+        }
 
-    QString passphraseHash1 = QByteArray(reinterpret_cast<const char*>(key), KEY_LEN).toHex();
-    DataStore::getChatDataStore()->setPassword(passphraseHash1);
+        QString passphraseHash1 = QByteArray(reinterpret_cast<const char*>(key), KEY_LEN).toHex();
+        DataStore::getChatDataStore()->setPassword(passphraseHash1);
 
-    auto dir =  QDir(QStandardPaths::writableLocation(QStandardPaths::AppDataLocation));
+        auto dir =  QDir(QStandardPaths::writableLocation(QStandardPaths::AppDataLocation));
 
-    QString target_encwallet_file = dirwalletenc;
-    QString target_decwallet_file = dirwallet;
+        QString target_encwallet_file = dirwalletenc;
+        QString target_decwallet_file = dirwallet;
 
-    FileEncryption::decrypt(target_decwallet_file, target_encwallet_file, key);
+        FileEncryption::decrypt(target_decwallet_file, target_encwallet_file, key);
 
-    auto dirHome =  QDir(QStandardPaths::writableLocation(QStandardPaths::HomeLocation));
-    QFile wallet(dirwallet);
-    qDebug() << __func__ << ": wallet size=" << wallet.size();
-    
-    if (wallet.size() == 0) {
-         QMessageBox::critical(this, tr("Wallet Encryption Failed"),
-                    QString("false password please try again"),
-                    QMessageBox::Ok
-                );
-                 this->removeWalletEncryptionStartUp();
-        }else{}   
+        auto dirHome =  QDir(QStandardPaths::writableLocation(QStandardPaths::HomeLocation));
+        QFile wallet(dirwallet);
+        qDebug() << __func__ << ": wallet size=" << wallet.size();
+
+        if (wallet.size() == 0) {
+            QMessageBox::critical(this, tr("Wallet Encryption Failed"),
+                                  QString("false password please try again"),
+                                  QMessageBox::Ok
+                                  );
+            this->removeWalletEncryptionStartUp();
+        }else{}
 
     }else{
         this->doClosePw();
     }
-
 }
 
 QString MainWindow::getPassword()