Add method to update depth presets

Author: chuzihang

src/Device.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Runtime.InteropServices;
+using System.Text;
 
 namespace Orbbec
 {
@@ -490,6 +491,29 @@ public void DeviceUpgradeFromData(byte[] fileData, DeviceUpgradeCallback callbac
             NativeException.HandleError(error);
         }
 
+        private const int OB_PATH_MAX = 1024;
+        public void UpdateOptionalDepthPresets(string[] filePaths, int pathCount, DeviceUpgradeCallback callback)
+        {
+            _deviceUpgradeCallback = callback;
+            IntPtr error = IntPtr.Zero;
+            IntPtr filesPtr = Marshal.AllocHGlobal(filePaths.Length * OB_PATH_MAX);
+            for (int i = 0; i < filePaths.Length; i++)
+            {
+                byte[] buffer = new byte[OB_PATH_MAX];
+                byte[] pathBytes = Encoding.UTF8.GetBytes(filePaths[i]);
+                int copyLength = Math.Min(pathBytes.Length, OB_PATH_MAX - 1);
+
+                Array.Copy(pathBytes, 0, buffer, 0, copyLength);
+                buffer[copyLength] = 0;
+
+                IntPtr filePtr = IntPtr.Add(filesPtr, i * OB_PATH_MAX);
+                Marshal.Copy(buffer, 0, filePtr, OB_PATH_MAX);
+            }
+            obNative.ob_device_update_optional_depth_presets(_handle.Ptr, filesPtr, (uint)pathCount, _nativeDeviceUpgradeCallback, IntPtr.Zero, ref error);
+            Marshal.FreeHGlobal(filesPtr);
+            NativeException.HandleError(error);
+        }
+
         /**
         * \if English
         * @brief Get the current state

src/obNative.cs

@@ -216,6 +216,10 @@ internal class obNative
         [DllImport(obsdk, EntryPoint = "ob_device_update_firmware_from_data")]
         public static extern void ob_device_update_firmware_from_data(IntPtr device, IntPtr fileData, UInt32 fileSize, [MarshalAs(UnmanagedType.FunctionPtr)] NativeDeviceUpgradeCallback callback, bool asycn, IntPtr userData, ref IntPtr error);
 
+        //void ob_device_update_optional_depth_presets(ob_device *device, const char file_path_list[][OB_PATH_MAX], uint8_t path_count, ob_device_fw_update_callback callback, void* user_data, ob_error **error);
+        [DllImport(obsdk, EntryPoint = "ob_device_update_optional_depth_presets")]
+        public static extern void ob_device_update_optional_depth_presets(IntPtr device, IntPtr filePathList, uint pathCount, [MarshalAs(UnmanagedType.FunctionPtr)] NativeDeviceUpgradeCallback callback, IntPtr userData, ref IntPtr error);
+
         //ob_device_state ob_device_get_device_state( ob_device* device, ob_error** error );
         [DllImport(obsdk, EntryPoint = "ob_device_get_device_state")]
         public static extern UInt64 ob_device_get_device_state(IntPtr device, ref IntPtr error);