From fd9de6d7faa9334f403e95dbc9226e474266a0c9 Mon Sep 17 00:00:00 2001
From: impressionyang <impressionyang@example.com>
Date: Fri, 12 Jun 2026 14:54:05 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E6=B8=85=E7=A9=BA=E6=97=A5=E5=BF=97?=
 =?UTF-8?q?=E6=94=B9=E4=B8=BA=E9=80=9A=E8=BF=87=20Logger=20=E8=87=AA?=
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Logger 持有打开的文件句柄，用外部 QFile 句柄 truncate 会导致
Logger 写入位置异常，产生大量空行。现在通过 Logger::clearLogFile()
在持有锁的情况下 flush → resize(0) → seek(0)，保证句柄一致。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
---
 src/ui/settings_page.cpp | 21 +++------------------
 src/utils/logger.cpp     |  9 +++++++++
 src/utils/logger.h       |  3 +++
 3 files changed, 15 insertions(+), 18 deletions(-)

diff --git a/src/ui/settings_page.cpp b/src/ui/settings_page.cpp
index 4fc3ea8..ea2bdcf 100644
--- a/src/ui/settings_page.cpp
+++ b/src/ui/settings_page.cpp
@@ -411,24 +411,9 @@ void SettingsPage::onResetConfig() {
 }
 
 void SettingsPage::onClearLogs() {
-    // 使用与 Logger 相同的路径逻辑
-    QString logDir = configManager_->get("app.log_dir").toString();
-    if (logDir.isEmpty()) {
-        logDir = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
-    }
-
-    auto result = clearDirectoryFiles(logDir, {"*.log"}, "日志文件", TruncateMode);
-    if (result.deletedCount < 0) {
-        QMessageBox::warning(this, "清除日志", "清除失败，请检查目录权限");
-        return;
-    }
-    if (result.deletedCount == 0) {
-        QMessageBox::information(this, "清除日志", "没有可清除的日志文件");
-        return;
-    }
-    QMessageBox::information(this, "清除日志",
-        QString("已清空 %1 个日志文件的内容，释放 %2 KB 空间")
-            .arg(result.deletedCount).arg(result.freedBytes / 1024));
+    Logger::clearLogFile();
+    LOG_INFO(kTag, "日志文件已通过 Logger 清空");
+    QMessageBox::information(this, "清除日志", "日志文件已清空");
     statusLabel_->setText("日志文件已清空");
 }
 
diff --git a/src/utils/logger.cpp b/src/utils/logger.cpp
index 67451a8..b0d2335 100644
--- a/src/utils/logger.cpp
+++ b/src/utils/logger.cpp
@@ -60,6 +60,15 @@ void Logger::setLogFile(const QString& path) {
     }
 }
 
+void Logger::clearLogFile() {
+    QMutexLocker locker(&mutex_);
+    if (logFile_ && logFile_->isOpen()) {
+        logFile_->flush();
+        logFile_->resize(0);
+        logFile_->seek(0);
+    }
+}
+
 void Logger::log(LogLevel level, const QString& tag, const QString& message) {
     QMutexLocker locker(&mutex_);
     QString logLine = QString("[%1] [%2] [%3] %4")
diff --git a/src/utils/logger.h b/src/utils/logger.h
index 4fead08..2c15a14 100644
--- a/src/utils/logger.h
+++ b/src/utils/logger.h
@@ -39,6 +39,9 @@ public:
     /** @brief 设置日志文件路径（运行时切换） */
     static void setLogFile(const QString& path);
 
+    /** @brief 清空日志文件内容（线程安全） */
+    static void clearLogFile();
+
 private:
     static QString levelToString(LogLevel level);
     static QString getTimestamp();