diff --git a/server/WebApi.cpp b/server/WebApi.cpp
index 64eec188..88e4d4ea 100755
--- a/server/WebApi.cpp
+++ b/server/WebApi.cpp
@@ -1563,7 +1563,7 @@ void installWebApi() {
             }
 
             //找到截图
-            auto tm = FindField(path.data() + scan_path.size(), nullptr, ".jpeg");
+            auto tm = findSubString(path.data() + scan_path.size(), nullptr, ".jpeg");
             if (atoll(tm.data()) + expire_sec < time(NULL)) {
                 //截图已经过期，改名，以便再次请求时，可以返回老截图
                 rename(path.data(), new_snap.data());
diff --git a/src/Common/Parser.cpp b/src/Common/Parser.cpp
index b47a0013..a7be567c 100644
--- a/src/Common/Parser.cpp
+++ b/src/Common/Parser.cpp
@@ -19,11 +19,12 @@ using namespace toolkit;
 
 namespace mediakit {
 
-string FindField(const char *buf, const char *start, const char *end, size_t buf_size) {
+string findSubString(const char *buf, const char *start, const char *end, size_t buf_size) {
     if (buf_size <= 0) {
         buf_size = strlen(buf);
     }
-    const char *msg_start = buf, *msg_end = buf + buf_size;
+    auto msg_start = buf;
+    auto msg_end = buf + buf_size;
     size_t len = 0;
     if (start != NULL) {
         len = strlen(start);
@@ -253,12 +254,12 @@ std::string Parser::mergeUrl(const string &base_url, const string &path) {
 }
 
 void RtspUrl::parse(const string &strUrl) {
-    auto schema = FindField(strUrl.data(), nullptr, "://");
+    auto schema = findSubString(strUrl.data(), nullptr, "://");
     bool is_ssl = strcasecmp(schema.data(), "rtsps") == 0;
     // 查找"://"与"/"之间的字符串，用于提取用户名密码
-    auto middle_url = FindField(strUrl.data(), "://", "/");
+    auto middle_url = findSubString(strUrl.data(), "://", "/");
     if (middle_url.empty()) {
-        middle_url = FindField(strUrl.data(), "://", nullptr);
+        middle_url = findSubString(strUrl.data(), "://", nullptr);
     }
     auto pos = middle_url.rfind('@');
     if (pos == string::npos) {
@@ -273,15 +274,15 @@ void RtspUrl::parse(const string &strUrl) {
     if (user_pwd.find(":") == string::npos) {
         return setup(is_ssl, url, user_pwd, "");
     }
-    auto user = FindField(user_pwd.data(), nullptr, ":");
-    auto pwd = FindField(user_pwd.data(), ":", nullptr);
+    auto user = findSubString(user_pwd.data(), nullptr, ":");
+    auto pwd = findSubString(user_pwd.data(), ":", nullptr);
     return setup(is_ssl, url, user, pwd);
 }
 
 void RtspUrl::setup(bool is_ssl, const string &url, const string &user, const string &passwd) {
-    auto ip = FindField(url.data(), "://", "/");
+    auto ip = findSubString(url.data(), "://", "/");
     if (ip.empty()) {
-        ip = split(FindField(url.data(), "://", NULL), "?")[0];
+        ip = split(findSubString(url.data(), "://", NULL), "?")[0];
     }
     uint16_t port = is_ssl ? 322 : 554;
     splitUrl(ip, ip, port);
diff --git a/src/Common/Parser.h b/src/Common/Parser.h
index 3d81cea3..3741f4bc 100644
--- a/src/Common/Parser.h
+++ b/src/Common/Parser.h
@@ -18,7 +18,7 @@
 namespace mediakit {
 
 // 从字符串中提取子字符串
-std::string FindField(const char *buf, const char *start, const char *end, size_t buf_size = 0);
+std::string findSubString(const char *buf, const char *start, const char *end, size_t buf_size = 0);
 // 把url解析为主机地址和端口号,兼容ipv4/ipv6/dns
 void splitUrl(const std::string &url, std::string &host, uint16_t &port);
 
diff --git a/src/Extension/Factory.cpp b/src/Extension/Factory.cpp
index c85f920c..4e0b795c 100644
--- a/src/Extension/Factory.cpp
+++ b/src/Extension/Factory.cpp
@@ -45,9 +45,9 @@ Track::Ptr Factory::getTrackBySdp(const SdpTrack::Ptr &track) {
         case CodecOpus : return std::make_shared<OpusTrack>();
 
         case CodecAAC : {
-            string aac_cfg_str = FindField(track->_fmtp.data(), "config=", ";");
+            string aac_cfg_str = findSubString(track->_fmtp.data(), "config=", ";");
             if (aac_cfg_str.empty()) {
-                aac_cfg_str = FindField(track->_fmtp.data(), "config=", nullptr);
+                aac_cfg_str = findSubString(track->_fmtp.data(), "config=", nullptr);
             }
             if (aac_cfg_str.empty()) {
                 //如果sdp中获取不到aac config信息，那么在rtp也无法获取，那么忽略该Track
@@ -67,8 +67,8 @@ Track::Ptr Factory::getTrackBySdp(const SdpTrack::Ptr &track) {
             //a=fmtp:96 packetization-mode=1;profile-level-id=42C01F;sprop-parameter-sets=Z0LAH9oBQBboQAAAAwBAAAAPI8YMqA==,aM48gA==
             auto map = Parser::parseArgs(track->_fmtp, ";", "=");
             auto sps_pps = map["sprop-parameter-sets"];
-            string base64_SPS = FindField(sps_pps.data(), NULL, ",");
-            string base64_PPS = FindField(sps_pps.data(), ",", NULL);
+            string base64_SPS = findSubString(sps_pps.data(), NULL, ",");
+            string base64_PPS = findSubString(sps_pps.data(), ",", NULL);
             auto sps = decodeBase64(base64_SPS);
             auto pps = decodeBase64(base64_PPS);
             if (sps.empty() || pps.empty()) {
diff --git a/src/Http/HttpClient.cpp b/src/Http/HttpClient.cpp
index 99581ea9..328872e6 100644
--- a/src/Http/HttpClient.cpp
+++ b/src/Http/HttpClient.cpp
@@ -21,7 +21,7 @@ namespace mediakit {
 void HttpClient::sendRequest(const string &url) {
     clearResponse();
     _url = url;
-    auto protocol = FindField(url.data(), NULL, "://");
+    auto protocol = findSubString(url.data(), NULL, "://");
     uint16_t port;
     bool is_https;
     if (strcasecmp(protocol.data(), "http") == 0) {
@@ -35,11 +35,11 @@ void HttpClient::sendRequest(const string &url) {
         throw std::invalid_argument(strErr);
     }
 
-    auto host = FindField(url.data(), "://", "/");
+    auto host = findSubString(url.data(), "://", "/");
     if (host.empty()) {
-        host = FindField(url.data(), "://", NULL);
+        host = findSubString(url.data(), "://", NULL);
     }
-    _path = FindField(url.data(), host.data(), NULL);
+    _path = findSubString(url.data(), host.data(), NULL);
     if (_path.empty()) {
         _path = "/";
     }
@@ -361,8 +361,8 @@ void HttpClient::checkCookie(HttpClient::HttpHeader &headers) {
         int index = 0;
         auto arg_vec = split(it_set_cookie->second, ";");
         for (string &key_val : arg_vec) {
-            auto key = FindField(key_val.data(), NULL, "=");
-            auto val = FindField(key_val.data(), "=", NULL);
+            auto key = findSubString(key_val.data(), NULL, "=");
+            auto val = findSubString(key_val.data(), "=", NULL);
 
             if (index++ == 0) {
                 cookie->setKeyVal(key, val);
diff --git a/src/Http/HttpCookieManager.cpp b/src/Http/HttpCookieManager.cpp
index 2ce0f188..b846a3b9 100644
--- a/src/Http/HttpCookieManager.cpp
+++ b/src/Http/HttpCookieManager.cpp
@@ -158,9 +158,9 @@ HttpServerCookie::Ptr HttpCookieManager::getCookie(const string &cookie_name, co
     if (it == http_header.end()) {
         return nullptr;
     }
-    auto cookie = FindField(it->second.data(), (cookie_name + "=").data(), ";");
+    auto cookie = findSubString(it->second.data(), (cookie_name + "=").data(), ";");
     if (cookie.empty()) {
-        cookie = FindField(it->second.data(), (cookie_name + "=").data(), nullptr);
+        cookie = findSubString(it->second.data(), (cookie_name + "=").data(), nullptr);
     }
     if (cookie.empty()) {
         return nullptr;
diff --git a/src/Http/HttpFileManager.cpp b/src/Http/HttpFileManager.cpp
index 9a22e64f..af032597 100644
--- a/src/Http/HttpFileManager.cpp
+++ b/src/Http/HttpFileManager.cpp
@@ -600,8 +600,8 @@ void HttpResponseInvokerImp::responseFile(const StrCaseMap &requestHeader,
     if (!strRange.empty()) {
         //分节下载
         code = 206;
-        auto iRangeStart = atoll(FindField(strRange.data(), "bytes=", "-").data());
-        auto iRangeEnd = atoll(FindField(strRange.data(), "-", nullptr).data());
+        auto iRangeStart = atoll(findSubString(strRange.data(), "bytes=", "-").data());
+        auto iRangeEnd = atoll(findSubString(strRange.data(), "-", nullptr).data());
         auto fileSize = fileBody->remainSize();
         if (iRangeEnd == 0) {
             iRangeEnd = fileSize - 1;
diff --git a/src/Player/PlayerBase.cpp b/src/Player/PlayerBase.cpp
index 31d8e051..cb00a0da 100644
--- a/src/Player/PlayerBase.cpp
+++ b/src/Player/PlayerBase.cpp
@@ -28,7 +28,7 @@ PlayerBase::Ptr PlayerBase::createPlayer(const EventPoller::Ptr &poller, const s
         ptr->teardown();
     };
     string url = url_in;
-    string prefix = FindField(url.data(), NULL, "://");
+    string prefix = findSubString(url.data(), NULL, "://");
     auto pos = url.find('?');
     if (pos != string::npos) {
         //去除？后面的字符串
diff --git a/src/Pusher/PusherBase.cpp b/src/Pusher/PusherBase.cpp
index fa0d68e8..eddbf7b8 100644
--- a/src/Pusher/PusherBase.cpp
+++ b/src/Pusher/PusherBase.cpp
@@ -26,7 +26,7 @@ PusherBase::Ptr PusherBase::createPusher(const EventPoller::Ptr &poller,
         });
         ptr->teardown();
     };
-    std::string prefix = FindField(url.data(), NULL, "://");
+    std::string prefix = findSubString(url.data(), NULL, "://");
 
     if (strcasecmp("rtsps",prefix.data()) == 0) {
         return PusherBase::Ptr(new TcpClientWithSSL<RtspPusherImp>(poller, std::dynamic_pointer_cast<RtspMediaSource>(src)), releasePusher);
diff --git a/src/Rtmp/RtmpPlayer.cpp b/src/Rtmp/RtmpPlayer.cpp
index 71e3ecb9..1c2b335c 100644
--- a/src/Rtmp/RtmpPlayer.cpp
+++ b/src/Rtmp/RtmpPlayer.cpp
@@ -52,14 +52,14 @@ void RtmpPlayer::teardown() {
 
 void RtmpPlayer::play(const string &url)  {
     teardown();
-    string host_url = FindField(url.data(), "://", "/");
+    string host_url = findSubString(url.data(), "://", "/");
     {
         auto pos = url.find_last_of('/');
         if (pos != string::npos) {
             _stream_id = url.substr(pos + 1);
         }
     }
-    _app = FindField(url.data(), (host_url + "/").data(), ("/" + _stream_id).data());
+    _app = findSubString(url.data(), (host_url + "/").data(), ("/" + _stream_id).data());
     _tc_url = string("rtmp://") + host_url + "/" + _app;
 
     if (!_app.size() || !_stream_id.size()) {
diff --git a/src/Rtmp/RtmpPusher.cpp b/src/Rtmp/RtmpPusher.cpp
index 9379d015..e8c55f70 100644
--- a/src/Rtmp/RtmpPusher.cpp
+++ b/src/Rtmp/RtmpPusher.cpp
@@ -65,9 +65,9 @@ void RtmpPusher::onPublishResult_l(const SockException &ex, bool handshake_done)
 
 void RtmpPusher::publish(const string &url)  {
     teardown();
-    string host_url = FindField(url.data(), "://", "/");
-    _app = FindField(url.data(), (host_url + "/").data(), "/");
-    _stream_id = FindField(url.data(), (host_url + "/" + _app + "/").data(), NULL);
+    string host_url = findSubString(url.data(), "://", "/");
+    _app = findSubString(url.data(), (host_url + "/").data(), "/");
+    _stream_id = findSubString(url.data(), (host_url + "/" + _app + "/").data(), NULL);
     _tc_url = string("rtmp://") + host_url + "/" + _app;
 
     if (!_app.size() || !_stream_id.size()) {
diff --git a/src/Rtsp/Rtsp.cpp b/src/Rtsp/Rtsp.cpp
index b80a88f7..2e3618da 100644
--- a/src/Rtsp/Rtsp.cpp
+++ b/src/Rtsp/Rtsp.cpp
@@ -180,11 +180,11 @@ void SdpParser::load(const string &sdp) {
                     break;
                 }
                 case 'a': {
-                    string attr = FindField(opt_val.data(), nullptr, ":");
+                    string attr = findSubString(opt_val.data(), nullptr, ":");
                     if (attr.empty()) {
                         track->_attr.emplace(opt_val, "");
                     } else {
-                        track->_attr.emplace(attr, FindField(opt_val.data(), ":", nullptr));
+                        track->_attr.emplace(attr, findSubString(opt_val.data(), ":", nullptr));
                     }
                     break;
                 }
@@ -245,7 +245,7 @@ void SdpParser::load(const string &sdp) {
                 it = track._attr.erase(it);
                 continue;
             }
-            track._fmtp = FindField(fmtp.data(), " ", nullptr);
+            track._fmtp = findSubString(fmtp.data(), " ", nullptr);
             ++it;
         }
 
diff --git a/src/Rtsp/RtspPlayer.cpp b/src/Rtsp/RtspPlayer.cpp
index a58880d3..0dafa03a 100644
--- a/src/Rtsp/RtspPlayer.cpp
+++ b/src/Rtsp/RtspPlayer.cpp
@@ -273,7 +273,7 @@ void RtspPlayer::handleResSETUP(const Parser &parser, unsigned int track_idx) {
     if (track_idx == 0) {
         _session_id = parser["Session"];
         _session_id.append(";");
-        _session_id = FindField(_session_id.data(), nullptr, ";");
+        _session_id = findSubString(_session_id.data(), nullptr, ";");
     }
 
     auto strTransport = parser["Transport"];
@@ -469,7 +469,7 @@ void RtspPlayer::handleResPAUSE(const Parser &parser, int type) {
     // 修正时间轴
     auto strRange = parser["Range"];
     if (strRange.size()) {
-        auto strStart = FindField(strRange.data(), "npt=", "-");
+        auto strStart = findSubString(strRange.data(), "npt=", "-");
         if (strStart == "now") {
             strStart = "0";
         }
diff --git a/src/Rtsp/RtspPusher.cpp b/src/Rtsp/RtspPusher.cpp
index e0855b19..4748fb15 100644
--- a/src/Rtsp/RtspPusher.cpp
+++ b/src/Rtsp/RtspPusher.cpp
@@ -291,13 +291,13 @@ void RtspPusher::handleResSetup(const Parser &parser, unsigned int track_idx) {
     if (track_idx == 0) {
         _session_id = parser["Session"];
         _session_id.append(";");
-        _session_id = FindField(_session_id.data(), nullptr, ";");
+        _session_id = findSubString(_session_id.data(), nullptr, ";");
     }
 
     auto transport = parser["Transport"];
     if (transport.find("TCP") != string::npos || transport.find("interleaved") != string::npos) {
         _rtp_type = Rtsp::RTP_TCP;
-        string interleaved = FindField(FindField((transport + ";").data(), "interleaved=", ";").data(), NULL, "-");
+        string interleaved = findSubString(findSubString((transport + ";").data(), "interleaved=", ";").data(), NULL, "-");
         _track_vec[track_idx]->_interleaved = atoi(interleaved.data());
     } else if (transport.find("multicast") != string::npos) {
         throw std::runtime_error("SETUP rtsp pusher can not support multicast!");
@@ -305,9 +305,9 @@ void RtspPusher::handleResSetup(const Parser &parser, unsigned int track_idx) {
         _rtp_type = Rtsp::RTP_UDP;
         createUdpSockIfNecessary(track_idx);
         const char *strPos = "server_port=";
-        auto port_str = FindField((transport + ";").data(), strPos, ";");
-        uint16_t rtp_port = atoi(FindField(port_str.data(), NULL, "-").data());
-        uint16_t rtcp_port = atoi(FindField(port_str.data(), "-", NULL).data());
+        auto port_str = findSubString((transport + ";").data(), strPos, ";");
+        uint16_t rtp_port = atoi(findSubString(port_str.data(), NULL, "-").data());
+        uint16_t rtcp_port = atoi(findSubString(port_str.data(), "-", NULL).data());
         auto &rtp_sock = _rtp_sock[track_idx];
         auto &rtcp_sock = _rtcp_sock[track_idx];
 
diff --git a/src/Rtsp/RtspSession.cpp b/src/Rtsp/RtspSession.cpp
index 33c59283..15db5aa8 100644
--- a/src/Rtsp/RtspSession.cpp
+++ b/src/Rtsp/RtspSession.cpp
@@ -595,8 +595,8 @@ void RtspSession::onAuthUser(const string &realm,const string &authorization){
         return;
     }
     //请求中包含认证信息
-    auto authType = FindField(authorization.data(),NULL," ");
-    auto authStr = FindField(authorization.data()," ",NULL);
+    auto authType = findSubString(authorization.data(), NULL, " ");
+    auto authStr = findSubString(authorization.data(), " ", NULL);
     if(authType.empty() || authStr.empty()){
         //认证信息格式不合法，回复401 Unauthorized
         onAuthFailed(realm,"can not find auth type or auth string");
@@ -690,9 +690,9 @@ void RtspSession::handleReq_Setup(const Parser &parser) {
         _rtcp_socks[trackIdx] = pr.second;
 
         //设置客户端内网端口信息
-        string strClientPort = FindField(parser["Transport"].data(), "client_port=", NULL);
-        uint16_t ui16RtpPort = atoi(FindField(strClientPort.data(), NULL, "-").data());
-        uint16_t ui16RtcpPort = atoi(FindField(strClientPort.data(), "-", NULL).data());
+        string strClientPort = findSubString(parser["Transport"].data(), "client_port=", NULL);
+        uint16_t ui16RtpPort = atoi(findSubString(strClientPort.data(), NULL, "-").data());
+        uint16_t ui16RtcpPort = atoi(findSubString(strClientPort.data(), "-", NULL).data());
 
         auto peerAddr = SockUtil::make_sockaddr(get_peer_ip().data(), ui16RtpPort);
         //设置rtp发送目标地址
@@ -785,7 +785,7 @@ void RtspSession::handleReq_Play(const Parser &parser) {
     if (!strRange.empty()) {
         //这是seek操作
         res_header.emplace("Range", strRange);
-        auto strStart = FindField(strRange.data(), "npt=", "-");
+        auto strStart = findSubString(strRange.data(), "npt=", "-");
         if (strStart == "now") {
             strStart = "0";
         }
diff --git a/tests/test_bench_push.cpp b/tests/test_bench_push.cpp
index d0929a8e..b34f8b99 100644
--- a/tests/test_bench_push.cpp
+++ b/tests/test_bench_push.cpp
@@ -124,7 +124,7 @@ int main(int argc, char *argv[]) {
     auto delay_ms = cmd_main["delay"].as<int>();
     auto pusher_count = cmd_main["count"].as<int>();
     auto merge_ms = cmd_main["merge"].as<int>();
-    auto schema = FindField(out_url.data(), nullptr, "://");
+    auto schema = findSubString(out_url.data(), nullptr, "://");
     if (schema != RTSP_SCHEMA && schema != RTMP_SCHEMA) {
         cout << "推流协议只支持rtsp或rtmp！" << endl;
         return -1;
diff --git a/tests/test_pusherMp4.cpp b/tests/test_pusherMp4.cpp
index ef338344..c28845d4 100644
--- a/tests/test_pusherMp4.cpp
+++ b/tests/test_pusherMp4.cpp
@@ -114,7 +114,7 @@ int domain(const string &filePath, const string &pushUrl) {
 
     auto poller = EventPollerPool::Instance().getPoller();
     //vhost/app/stream可以随便自己填，现在不限制app应用名了
-    createPusher(poller, FindField(pushUrl.data(), nullptr, "://").substr(0, 4), DEFAULT_VHOST, "live", "stream", filePath, pushUrl);
+    createPusher(poller, findSubString(pushUrl.data(), nullptr, "://").substr(0, 4), DEFAULT_VHOST, "live", "stream", filePath, pushUrl);
     //设置退出信号处理函数
     static semaphore sem;
     signal(SIGINT, [](int) { sem.post(); });// 设置退出信号