修改保存逻辑：先检查C++服务连接性再决定上传流程

- 添加checkCppServiceConnection函数用于检查C++服务是否可连接
- 修改保存逻辑：如果C++服务可连接，先发送文件内容到C++服务，只有在收到200状态码后才继续保存到服务器
- 如果C++服务不可连接，则直接使用API函数保存到服务器
- 完善输出信息，帮助用户了解当前处理流程

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

dist/localClient.js

@@ -33,9 +33,51 @@ var __importStar = (this && this.__importStar) || (function () {
     };
 })();
 Object.defineProperty(exports, "__esModule", { value: true });
+exports.checkCppServiceConnection = checkCppServiceConnection;
 exports.sendFileToCppService = sendFileToCppService;
 const http = __importStar(require("http"));
+const net = __importStar(require("net"));
 const vscode = __importStar(require("vscode"));
+/**
+ * 检查本地C++服务是否可连接
+ * @returns Promise<boolean> 是否可连接
+ */
+async function checkCppServiceConnection() {
+    // 从配置中获取端口号，默认为26000
+    const config = vscode.workspace.getConfiguration('squirrel');
+    const localServicePort = config.get('localServicePort', 26000);
+    return new Promise((resolve) => {
+        const socket = new net.Socket();
+        let isResolved = false;
+        socket.setTimeout(3000); // 3秒超时
+        socket.connect(localServicePort, '127.0.0.1', () => {
+            // 连接成功，端口可达
+            socket.destroy();
+            resolve(true);
+        });
+        socket.on('error', (error) => {
+            // 连接失败
+            if (!isResolved) {
+                isResolved = true;
+                resolve(false);
+            }
+        });
+        socket.on('timeout', () => {
+            // 连接超时
+            socket.destroy();
+            if (!isResolved) {
+                isResolved = true;
+                resolve(false);
+            }
+        });
+        socket.on('close', () => {
+            if (!isResolved) {
+                isResolved = true;
+                resolve(false);
+            }
+        });
+    });
+}
 /**
  * 构建JSON数据
  * @param filePath 文件路径