feat(原生桌面): 新增原生桌面与字体适配

internal/webview/webview_files_windows.go

@@ -0,0 +1,75 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package webview
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"syscall"
+	"unsafe"
+)
+
+// replaceFileProc 保留目标文件属性并替换文件内容
+var replaceFileProc = syscall.NewLazyDLL("kernel32.dll").NewProc("ReplaceFileW")
+
+// openReadFile 允许原子替换路径，同时保持已有读取句柄有效
+func openReadFile(name string) (*os.File, error) {
+	path, err := nativeFilePath(name)
+	if err != nil {
+		return nil, &os.PathError{Op: "open", Path: name, Err: err}
+	}
+	handle, err := syscall.CreateFile(path, syscall.GENERIC_READ, syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE, nil, syscall.OPEN_EXISTING, syscall.FILE_ATTRIBUTE_NORMAL, 0)
+	if err != nil {
+		return nil, &os.PathError{Op: "open", Path: name, Err: err}
+	}
+	return os.NewFile(uintptr(handle), name), nil
+}
+
+// replaceFile 替换已有文件，目标不存在时直接重命名
+func replaceFile(source, target string) error {
+	from, err := nativeFilePath(source)
+	if err != nil {
+		return err
+	}
+	to, err := nativeFilePath(target)
+	if err != nil {
+		return err
+	}
+	result, _, err := replaceFileProc.Call(uintptr(unsafe.Pointer(to)), uintptr(unsafe.Pointer(from)), 0, 0, 0, 0)
+	if result != 0 {
+		return nil
+	}
+	if err == syscall.ERROR_FILE_NOT_FOUND {
+		return os.Rename(source, target)
+	}
+	return &os.LinkError{Op: "replace", Old: source, New: target, Err: err}
+}
+
+// nativeFilePath 转换绝对路径并支持长路径与网络共享
+func nativeFilePath(name string) (*uint16, error) {
+	path, err := filepath.Abs(name)
+	if err != nil {
+		return nil, err
+	}
+	if !strings.HasPrefix(path, `\\?\`) {
+		if strings.HasPrefix(path, `\\`) {
+			path = `\\?\UNC\` + path[2:]
+		} else {
+			path = `\\?\` + path
+		}
+	}
+	return syscall.UTF16PtrFromString(path)
+}