在关于窗口添加“清除”链接，直接清除滚轴张数

app/scanner/mainwindow.cpp

@@ -39,6 +39,7 @@
 #include "app_cfg.h"
 
 #define PASSWORD_KEY 4
+#define MY_URL_SCHEME       "inscanner"
 
 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
@@ -2066,6 +2067,31 @@ void MainWindow::on_act_help_triggered()
         QDesktopServices::openUrl(QUrl::fromLocalFile(filename));
 }
 
+void MainWindow::my_url_handler(const QUrl& url)
+{
+    QMessageBox::about(this, "hello", url.url());
+
+    std::string to(url.url().toStdString());
+
+    if(to.find("://clear-roller") != std::string::npos)
+    {
+        unsigned int count = 0;
+        int ret = sane_io_control(cur_dev_.handle(), IO_CTRL_CODE_CLEAR_ROLLER_COUNT, nullptr, &count);
+
+        QString info;
+        if(ret == SANE_STATUS_GOOD)
+        {
+            info = tr("Roller scanned count has been set to 0.");
+
+            // +请重新进入关于界面以获取最新值
+            info += QString::fromStdString("\350\257\267\351\207\215\346\226\260\350\277\233\345\205\245\345\205\263\344\272\216\347\225\214\351\235\242\344\273\245\350\216\267\345\217\226\346\234\200\346\226\260\345\200\274");
+        }
+        else
+            info = tr("Roller scanned count reset failed.");
+
+        QMessageBox::information(this, tr("hint"), info);
+    }
+}
 void MainWindow::on_act_about_triggered()
 {
     QString company;
@@ -2087,6 +2113,7 @@ void MainWindow::on_act_about_triggered()
                        "<p>%4%5%6%7%8%9</p>")
                    .arg(appName).arg("v2.0.9.061").arg(copyRight).arg(developer).arg(website).arg(contact).arg(afterSelesContact).arg(address).arg(navigation));
 
+    QDesktopServices::setUrlHandler(MY_URL_SCHEME, this, "my_url_handler");
     if (sane_io_control(cur_dev_.handle(), IO_CTRL_CODE_ABOUT_INFO, about, &len) == SANE_STATUS_NO_MEM)
     {
         about = (SANE_About*)malloc(len + 128);
@@ -2101,15 +2128,23 @@ void MainWindow::on_act_about_triggered()
                 for (int i = 0; about->appendix[i].key; ++i)
                 {
                     if(about->appendix[i].url)
-                        content += tr("<p>%1: <a href='%2'>%3</a></p>").arg(about->appendix[i].key).arg(about->appendix[i].url).arg(about->appendix[i].content);
+                        content += tr("<p>%1: <a href='%2'>%3</a>").arg(about->appendix[i].key).arg(about->appendix[i].url).arg(about->appendix[i].content);
                     else
-                        content += tr("<p>%1: %2</p>").arg(about->appendix[i].key).arg(about->appendix[i].content);
+                        content += tr("<p>%1: %2").arg(about->appendix[i].key).arg(about->appendix[i].content);
+                    if(strcmp(about->appendix[i].key, "\346\273\232\350\275\264\345\274\240\346\225\260") == 0)
+                    {
+                        char    url[128] = {0};
+                        sprintf(url, "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=%s://clear-roller>\346\270\205\351\231\244</a>", MY_URL_SCHEME);
+                        content += QString::fromStdString(url);
+                    }
+                    content += "</p>";
                 }
             }
             free(about);
         }
     }
     QMessageBox::about(this, title, content);
+    QDesktopServices::unsetUrlHandler(MY_URL_SCHEME);
 }
 
 void MainWindow::on_act_scannerSettings_triggered()

app/scanner/mainwindow.h

@@ -192,6 +192,9 @@ private slots:
 
     void on_scanOptions_changed(const QString &device, const QString &option, bool checked_now);
 
+public slots:
+    void my_url_handler(const QUrl& url);
+
 protected:
     virtual void closeEvent(QCloseEvent *e) override;