diff --git a/cosclient.cpp b/cosclient.cpp
index 6d32c48..e8d01a2 100644
--- a/cosclient.cpp
+++ b/cosclient.cpp
@@ -144,7 +144,7 @@ bool COSClient::save2Local(const QString &path, const QString &localpath, const
     return true;
 }
 
-QMap<QString,QString> COSClient::headObject(const QString &path, const QString &localpath,const QString &versionId, headHeader &reqHeader)
+preResponse COSClient::headObject(const QString &path, const QString &localpath,const QString &versionId, headHeader &reqHeader)
 {
     preRequest request;
     if(!versionId.isEmpty()) {
@@ -163,10 +163,11 @@ QMap<QString,QString> COSClient::headObject(const QString &path, const QString &
         request.customHeaders.insert("If-None-Match", reqHeader.ifNoneMatch);
     }
     preResponse response = invokeHeadRequest(path, request);
-    return response.headers;
+
+    return response;
 }
 
-bool COSClient::deleteObject(const QString &path, const QString &versionId)
+preResponse COSClient::deleteObject(const QString &path, const QString &versionId)
 {
     preRequest request;
     bool haveId=!versionId.isEmpty();
@@ -184,7 +185,7 @@ bool COSClient::deleteObject(const QString &path, const QString &versionId)
     else if(!haveId && deleteMarker){
         qDebug()<<"创建了一个删除标记作为"<<path<<"的最新版本";
     }
-    return deleteMarker;
+    return response;
 }
 
 QString COSClient::multiUpload(const QString &path, const QString &localpath, QMap<QString, QString> metaDatas)
@@ -213,6 +214,11 @@ QString COSClient::multiUpload(const QString &path, const QString &localpath, QM
     return result;
 }
 
+bool COSClient::isExist(preResponse &response)
+{
+    return response.statusCode!=404;
+}
+
 // 修改后的函数实现
 
 preResponse COSClient::invokeGetFileRequest(const QString& path, const preRequest& request) {
@@ -527,6 +533,11 @@ QString COSClient::_getContentMD5(const QByteArray &data)
     return base64;
 }
 
+QString COSClient::_getContentCRC64(const QString &path)
+{
+
+}
+
 QNetworkRequest COSClient::buildGetRequest(const QString &path, const QMap<QString, QString> queryParams)
 {
     if (!preCheckSession())
diff --git a/cosclient.h b/cosclient.h
index 1a5c769..ebea1f9 100644
--- a/cosclient.h
+++ b/cosclient.h
@@ -70,9 +70,10 @@ class COSClient : public QObject
     QString completeMultipartUpload(QString path, QString uploadId, QMap<int, QString> partEtagMap);
     QByteArray getObject(const QString &path,const QString &versionId, QMap<QString,QString> &respHeaders);
     bool save2Local(const QString &path, const QString &localpath,const QString &versionId, QMap<QString,QString> &respMetaDatas);
-    QMap<QString,QString> headObject(const QString &path, const QString &localpath,const QString &versionId, headHeader &reqHeader);
-    bool deleteObject(const QString &path, const QString &versionId);
+    preResponse headObject(const QString &path, const QString &localpath,const QString &versionId, headHeader &reqHeader);
+    preResponse deleteObject(const QString &path, const QString &versionId);
     QString multiUpload(const QString &path, const QString &localpath, QMap<QString,QString> metaDatas=QMap<QString,QString>());
+    bool isExist(preResponse &response);
 
 private:
     QString bucketName;
@@ -89,6 +90,7 @@ class COSClient : public QObject
     bool preCheckSession();
     QString _getContentTypeByPath(const QString &path);
     QString _getContentMD5(const QByteArray &data);
+    QString _getContentCRC64(const QString &path);//获取本地文件crc64
     QNetworkRequest buildGetRequest(const QString& path,const QMap<QString, QString> queryParams);
     QNetworkRequest buildPutRequest(const QString& path,const QMap<QString, QString> queryParams, const QByteArray& data);
     QNetworkRequest buildHeadRequest(const QString& path,const QMap<QString, QString> queryParams);