增加日志，完善逻辑

WIN10_WinISP_SrcCode_For_MOKA_20250416_1/WinISP/BaseClass/GraphicCardI2CCtrl.cs

@@ -144,15 +144,165 @@ namespace WinISP.BaseClass
             }
         }
 
+        private readonly object _graphicsCardLock = new object();
+        private volatile bool _isDisposing = false;
+
         private void FreeGraphicsCardCtrl()
         {
-            // Free the GCHandle.
-            frmISP.WriteLog("Free the GCHandle.", "debug");
-            if (gch.IsAllocated)
-                gch.Free();
-            DisposeGraphicCardCtrl();
-            pGraphicCardCtrl = IntPtr.Zero;
-            _IsInit = false;
+            lock (_graphicsCardLock)
+            {
+                // 防止重复释放
+                if (_isDisposing)
+                {
+                    frmISP.WriteLog("Graphics card control is already being disposed, skipping.", "warn");
+                    return;
+                }
+
+                if (!_IsInit)
+                {
+                    frmISP.WriteLog("Graphics card control is not initialized, nothing to free.", "debug");
+                    return;
+                }
+
+                _isDisposing = true;
+
+                try
+                {
+                    // 第一步：释放 GCHandle
+                    FreeGCHandle();
+
+                    // 第二步：释放图形卡控制资源
+                    DisposeGraphicsCardControl();
+
+                    // 第三步：清空指针
+                    pGraphicCardCtrl = IntPtr.Zero;
+
+                    // 第四步：更新状态
+                    _IsInit = false;
+
+                    frmISP.WriteLog("Graphics card control freed successfully.", "info");
+                }
+                catch (Exception ex)
+                {
+                    frmISP.WriteLog($"Error freeing graphics card control: {ex.GetType().Name} - {ex.Message}", "error");
+                    // 即使出错也要尝试清理状态
+                    try
+                    {
+                        pGraphicCardCtrl = IntPtr.Zero;
+                        _IsInit = false;
+                    }
+                    catch (Exception cleanupEx)
+                    {
+                        frmISP.WriteLog($"Error during cleanup after exception: {cleanupEx.Message}", "error");
+                    }
+                }
+                finally
+                {
+                    _isDisposing = false;
+                }
+            }
+        }
+
+        /// <summary>
+        /// 安全释放 GCHandle
+        /// </summary>
+        private void FreeGCHandle()
+        {
+            try
+            {
+                if (gch.IsAllocated)
+                {
+                    frmISP.WriteLog("Freeing GCHandle...", "debug");
+                    gch.Free();
+                    frmISP.WriteLog("GCHandle freed successfully.", "debug");
+                }
+                else
+                {
+                    frmISP.WriteLog("GCHandle is not allocated, skipping free operation.", "debug");
+                }
+            }
+            catch (InvalidOperationException ex)
+            {
+                frmISP.WriteLog($"InvalidOperationException when freeing GCHandle: {ex.Message}", "warn");
+            }
+            catch (Exception ex)
+            {
+                frmISP.WriteLog($"Unexpected exception when freeing GCHandle: {ex.GetType().Name} - {ex.Message}", "error");
+            }
+        }
+
+        /// <summary>
+        /// 安全释放图形卡控制资源
+        /// </summary>
+        private void DisposeGraphicsCardControl()
+        {
+            try
+            {
+                if (pGraphicCardCtrl != IntPtr.Zero)
+                {
+                    frmISP.WriteLog("Disposing graphics card control...", "debug");
+                    DisposeGraphicCardCtrl();
+                    frmISP.WriteLog("Graphics card control disposed successfully.", "debug");
+                }
+                else
+                {
+                    frmISP.WriteLog("Graphics card control pointer is null, skipping dispose.", "debug");
+                }
+            }
+            catch (AccessViolationException ex)
+            {
+                frmISP.WriteLog($"AccessViolationException when disposing graphics card control: {ex.Message}", "error");
+            }
+            catch (ObjectDisposedException ex)
+            {
+                frmISP.WriteLog($"ObjectDisposedException when disposing graphics card control: {ex.Message}", "warn");
+            }
+            catch (Exception ex)
+            {
+                frmISP.WriteLog($"Unexpected exception when disposing graphics card control: {ex.GetType().Name} - {ex.Message}", "error");
+            }
+        }
+
+        /// <summary>
+        /// 验证图形卡控制是否已正确释放
+        /// </summary>
+        public bool IsGraphicsCardControlFreed()
+        {
+            lock (_graphicsCardLock)
+            {
+                return !_IsInit && pGraphicCardCtrl == IntPtr.Zero && !gch.IsAllocated;
+            }
+        }
+
+        /// <summary>
+        /// 强制清理（用于异常恢复）
+        /// </summary>
+        public void ForceCleanupGraphicsCardCtrl()
+        {
+            lock (_graphicsCardLock)
+            {
+                try
+                {
+                    frmISP.WriteLog("Performing force cleanup of graphics card control...", "warn");
+
+                    // 强制释放 GCHandle
+                    if (gch.IsAllocated)
+                    {
+                        try { gch.Free(); }
+                        catch { }
+                    }
+
+                    // 强制清空指针
+                    pGraphicCardCtrl = IntPtr.Zero;
+                    _IsInit = false;
+
+                    frmISP.WriteLog("Force cleanup completed.", "info");
+                }
+                catch (Exception ex)
+                {
+                    frmISP.WriteLog($"Error during force cleanup: {ex.Message}", "error");
+                }
+            }
         }
 
         public GraphicCardI2CCtrl()
@@ -254,27 +404,24 @@ namespace WinISP.BaseClass
             Byte slvAddr = data[0];
             Byte[] wrBuf = new Byte[data.Length - 1];
             Array.Copy(data, 1, wrBuf, 0, wrBuf.Length);
-            const Byte maxWrLen = 16;
-            int idx = 0;
-            unsafe
-            {
-                fixed (Byte* pArr = wrBuf)
-                {
-                    return DDCWrite(pGraphicCardCtrl, slvAddr, (uint)(wrBuf.Length), wrBuf);
-                }
-            }
+
+            bool ret = DDCWrite(pGraphicCardCtrl, slvAddr, (uint)wrBuf.Length, wrBuf);
+            frmISP.WriteLog($"[DDCWrite] card={GraphicCardType} slv=0x{slvAddr:X2} len={wrBuf.Length} ret={ret}", ret ? "debug" : "error");
+            return ret;
         }
 
         public bool ReadData(byte[] data, byte[] wrCmds = null)
         {
-            uint revlen = (uint)data.Length;
-            unsafe
+            if (wrCmds == null || wrCmds.Length == 0)
             {
-                fixed (Byte* pArr = data)
-                {
-                    return DDCRead(pGraphicCardCtrl, wrCmds[0], revlen, data);
-                }
+                frmISP.WriteLog($"[DDCRead] card={GraphicCardType} wrCmds is NULL/empty!", "error");
+                return false;
             }
+            uint revlen = (uint)data.Length;
+            bool ret = DDCRead(pGraphicCardCtrl, wrCmds[0], revlen, data);
+            frmISP.WriteLog($"[DDCRead] card={GraphicCardType} slv=0x{wrCmds[0]:X2} rdLen={revlen} ret={ret} " +
+                            $"first4={(data.Length >= 4 ? BitConverter.ToString(data, 0, 4) : "n/a")}", ret ? "debug" : "error");
+            return ret;
         }
 
         public bool Init()

WIN10_WinISP_SrcCode_For_MOKA_20250416_1/WinISP/BaseClass/MTKDebugCmd.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Linq;
+using WinISP;
 
 namespace MTK
 {
@@ -72,6 +74,12 @@ namespace MTK
                 strData = "";
                 if (_i2cCtrl.ReadData(recvBuf, wrCmds) == true)
                 {
+                    frmISP.WriteLog(
+                            $"[DDC_Read RAW] cmd=0x{data[1]:X2} recvLen={recvLen} " +
+                            $"raw=[{string.Join(" ", recvBuf.Select(b => b.ToString("X2")))}]",
+                            "debug");
+
+                    // ────────
                     for (int i = 0; i < recvBuf.Length; ++i)
                         strData += recvBuf[i].ToString("X2") + " ";
 
@@ -102,6 +110,29 @@ namespace MTK
             return null;
         }
 
+        /// <summary>
+        /// 从 DDC 0x6F 继续读取数据（不重新发送命令）。
+        /// 用于 N卡 DP AUX 通道 16 字节限制导致截断时的分段续读。
+        /// 在 DDC_Read 成功返回后立即调用，尝试读取响应缓冲区中尚未消费的剩余字节。
+        /// </summary>
+        /// <param name="recvLen">要读取的字节数</param>
+        /// <returns>读取到的字节数组，失败返回 null</returns>
+        public static Byte[] DDC_ReadContinue(int recvLen)
+        {
+            const Byte dest = 0x6F;
+            Byte[] wrCmds = { dest };
+            Byte[] recvBuf = new Byte[recvLen];
+            if (_i2cCtrl.ReadData(recvBuf, wrCmds))
+            {
+                frmISP.WriteLog(
+                    $"[DDC_ReadContinue] rdLen={recvLen} raw=[{string.Join(" ", recvBuf.Select(b => b.ToString("X2")))}]",
+                    "debug");
+                return recvBuf;
+            }
+            frmISP.WriteLog($"[DDC_ReadContinue] rdLen={recvLen} read failed", "debug");
+            return null;
+        }
+
         private static Byte CalCheckSum(Byte[] data, int startIdx = 0)
         {
             Byte chkSum = 0;

WIN10_WinISP_SrcCode_For_MOKA_20250416_1/WinISP/frmISP.cs

@@ -1859,21 +1859,38 @@ namespace WinISP
         private static string resultFolder = System.IO.Directory.GetCurrentDirectory() + "\\";
         private static System.IO.StreamWriter _logWriter = null;
         private static string _logPath = null;
+        private static readonly object _logLock = new object();
         [Conditional("DEBUG")]
-        public static void WriteLog(string str, string fileName)
+        public static void WriteLog(string str, string level)
         {
-            if (!System.IO.Directory.Exists(resultFolder))
-                System.IO.Directory.CreateDirectory(resultFolder);
-
-            string path = resultFolder + (fileName == "" ? "" : fileName + "_") + DateTime.Now.ToString("yyyy-MM-dd") + ".log";
-            if (_logWriter == null || _logPath != path)
+            try
             {
-                if (_logWriter != null) { _logWriter.Flush(); _logWriter.Close(); }
-                _logPath = path;
-                _logWriter = new System.IO.StreamWriter(path, append: true);
+                if (!System.IO.Directory.Exists(resultFolder))
+                    System.IO.Directory.CreateDirectory(resultFolder);
+
+                string path = resultFolder + (level == "" ? "" : level + "_") + DateTime.Now.ToString("yyyy-MM-dd") + ".log";
+
+                lock (_logLock)   // >>> 新增：同进程内串行化，避免自家多线程争用
+                {
+                    if (_logWriter == null || _logPath != path)
+                    {
+                        if (_logWriter != null)
+                        {
+                            try { _logWriter.Flush(); _logWriter.Close(); } catch { }
+                        }
+                        _logPath = path;
+                        var stream = new FileStream(path, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
+                        _logWriter = new System.IO.StreamWriter(stream);
+                    }
+                    _logWriter.WriteLine(DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss.fff: ") + str);
+                    _logWriter.Flush();
+                }
+            }
+            catch (Exception)   // >>> 改动：IOException → Exception，吞掉一切日志异常
+            {
+                // 日志写入失败绝不能影响主流程。可选：降级写到 Debug 输出
+                try { System.Diagnostics.Debug.WriteLine("[LOG-FALLBACK] " + str); } catch { }
             }
-            _logWriter.WriteLine(DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss.fff: ") + str);
-            _logWriter.Flush();
         }
 
         private void cboConnectedMonitor_SelectedIndexChanged(object sender, EventArgs e)