void http_handler_Get_Download(struct evhttp_request *req, void *arg){ if (req == NULL) { return; } const char *uri = evhttp_request_get_uri(req); string strUrl(uri); string strFilePath = DPC::get_Url_path(strUrl, "path="); printf("FilePath = %s \n", strFilePath.c_str()); string strFileName = DPC::get_FileName_path(strUrl, "/"); strFileName = "attachment; filename=" + strFileName; //查看文件是否存在 if (access(strFilePath.c_str(), 0) == -1) { evhttp_send_error(req, HTTP_BADREQUEST, 0); return; } //========= std::ifstream t; t.open(strFilePath.c_str(), ios::in | ios::binary); t.seekg(0, std::ios::end); long length = t.tellg(); t.seekg(0, std::ios::beg); char *buffer = new char[length]; t.read(buffer, length); t.close(); char FileSize[10] = { ‘\0‘ }; snprintf(FileSize, sizeof(FileSize), "%d", length); time_t timep; time(&timep); char s[50]; sprintf(s, ctime(&timep)); std::string strDate = std::string(s, s + (strlen(s) - 1)); evhttp_add_header(evhttp_request_get_output_headers(req), "Server", "Unix"); evhttp_add_header(evhttp_request_get_output_headers(req), "Content-Type", "application/octet-stream; charset=utf-8"); evhttp_add_header(evhttp_request_get_output_headers(req), "Content-Disposition", strFileName.c_str()); evhttp_add_header(evhttp_request_get_output_headers(req), "Content-Length", FileSize); evhttp_add_header(evhttp_request_get_output_headers(req), "Date", strDate.c_str()); evhttp_add_header(evhttp_request_get_output_headers(req), "Connection", "close"); //========= //回响应 struct evbuffer *retbuff = NULL; retbuff = evbuffer_new(); if (retbuff == NULL) { return; } evbuffer_add(retbuff, buffer, length); //evbuffer_add_printf(retbuff, "123"); evhttp_send_reply(req, HTTP_OK, "Client", retbuff); evbuffer_free(retbuff);}