diff --git a/update.cpp b/update.cpp
index 9ab08d3..60b38ee 100644
--- a/update.cpp
+++ b/update.cpp
@@ -787,15 +787,10 @@ bool Update::doUpdate() {
         } else {
             // TODO
         }
-        char buf[128];
-        memset(buf, 0x00, sizeof(buf));
-        snprintf(buf, sizeof(buf)-1, "DONE, %*.*s, %*.*s, %*.*s\n",
-            35, 35, name.toStdString().c_str(),
-            20, 20, QDateTime::currentDateTime().toString(Qt::ISODate).toStdString().c_str(),
-            10, 10, (res == true) ? "SUCCESS" : "ERROR");
-        m_update_ctrl_file_copy.write(buf);
-
-        qInfo() << "write" << buf << "into file" << m_update_ctrl_file_copy;
+        out << "DONE, " << name << ", "
+            << QDateTime::currentDateTime().toString(Qt::ISODate) << ", "
+            << ((res == true) ? "SUCCESS" : "ERROR") << "\n";
+        out.flush();
 
     } // for (it = openLines.cbegin(); it != openLines.end(); ++it) {