基于cocos2d-x 3.x版本修改的Assets Manager,加几行代码就能实现断线续传功能…so easy

 bool AssetsManager::downLoad()
 {
     // Create a file to save package.
     const string outFileName = _storagePath + TEMP_PACKAGE_FILE_NAME;
-    FILE *fp = fopen(outFileName.c_str(), "wb");
+    ssize_t outFileLength = 0;
+    FILE *fp = fopen(outFileName.c_str(), "rb");
+    if(fp)
+    {
+        fseek(fp, 0, SEEK_END);
+        outFileLength = ftell(fp);
+        fclose(fp);
+    }
+    
+    fp = fopen(outFileName.c_str(), "ab");

然后在下面设置curl的地方

     curl_easy_setopt(_curl, CURLOPT_FOLLOWLOCATION, 1 );
+    if(outFileLength > 0)
+        curl_easy_setopt(_curl, CURLOPT_RESUME_FROM, outFileLength);
 
     res = curl_easy_perform(_curl);