diff --git a/src/main/ets/utils/ToolsHelper.ets b/src/main/ets/utils/ToolsHelper.ets
index 20600ba..b7a8e53 100644
--- a/src/main/ets/utils/ToolsHelper.ets
+++ b/src/main/ets/utils/ToolsHelper.ets
@@ -1,6 +1,6 @@
 import promptAction from '@ohos.promptAction';
 import { BusinessError, deviceInfo } from '@kit.BasicServicesKit';
-import { HashMap, util } from '@kit.ArkTS';
+import { buffer, HashMap, util } from '@kit.ArkTS';
 import { DeviceInfo } from '../bean/DeviceInfo';
 import { common } from '@kit.AbilityKit';
 import { md5_hex } from '../util/md5';
@@ -433,6 +433,11 @@ export class ToolsHelper {
     return decoder.decodeToString(new Uint8Array(arrayBuffer))
   }
 
+  static stringToArrayBuffer(str: string): ArrayBuffer {
+    let buf = buffer.from(str, 'utf-8'); // 使用 UTF-8 编码
+    return buf.buffer;
+  }
+
   private static setTimeOutMap: Map<string, ThrottleInterface> = new Map()
   private static uniqueIdMap = new WeakMap<Function, string>();