diff --git a/app/src/main/cpp/MicroPhoto.cpp b/app/src/main/cpp/MicroPhoto.cpp
index abcfd73f..e624286c 100644
--- a/app/src/main/cpp/MicroPhoto.cpp
+++ b/app/src/main/cpp/MicroPhoto.cpp
@@ -186,7 +186,7 @@ jint JNI_OnLoad(JavaVM* vm, void* reserved)
 {
     JNIEnv* env = NULL;
     jint result = -1;
-    
+
     // 在 JNI_OnLoad 或其他初始化函数中注册
 #if 0
     signal(SIGSEGV, sighandler);
@@ -314,12 +314,10 @@ Java_com_xypower_mpapp_MainActivity_takePhoto(
     unsigned char id = (unsigned char)channel - 1;
 
     Camera2Reader *camera = new Camera2Reader(id);
-    const char *pathStr = env->GetStringUTFChars(path, 0);
-    const char *fileNameStr = env->GetStringUTFChars(fileName, 0);
+    std::string pathStr = jstring2string(env, path);
+    std::string fileNameStr = jstring2string(env, fileName);
 
-    camera->Open(pathStr, fileNameStr);
-    env->ReleaseStringUTFChars(fileName, fileNameStr);
-    env->ReleaseStringUTFChars(path, pathStr);
+    camera->Open(pathStr.c_str(), fileNameStr.c_str());
 
     camera->start();
 
@@ -351,12 +349,12 @@ Java_com_xypower_mpapp_MicroPhotoService_init(
     env->SetObjectField(pThis, fieldId, modelName);
 
     bool udpOrTcp = (networkProtocol != 0); // 0: tcp
-    const char *appPathStr = appPath == NULL ? NULL : env->GetStringUTFChars(appPath, 0);
-    const char *ipStr = ip == NULL ? NULL : env->GetStringUTFChars(ip, 0);
-    const char *cmdidStr = cmdid == NULL ? NULL : env->GetStringUTFChars(cmdid, 0);
-    const char *simcardStr = simcard == NULL ? NULL : env->GetStringUTFChars(simcard, 0);
-    const char *tfCardPathStr = tfCardPath == NULL ? NULL : env->GetStringUTFChars(tfCardPath, 0);
-    const char *nativeLibraryDirStr = nativeLibraryDir == NULL ? NULL : env->GetStringUTFChars(nativeLibraryDir, 0);
+    std::string appPathStr = jstring2string(env, appPath);
+    std::string ipStr = jstring2string(env, ip);
+    std::string cmdidStr = jstring2string(env, cmdid);
+    std::string simcardStr = jstring2string(env, simcard);
+    std::string tfCardPathStr = jstring2string(env, tfCardPath);
+    std::string nativeLibraryDirStr = jstring2string(env, nativeLibraryDir);
 
     JavaVM* vm = NULL;
     jint ret = env->GetJavaVM(&vm);
@@ -367,14 +365,14 @@ Java_com_xypower_mpapp_MicroPhotoService_init(
 
     CTerminal* pTerminal = NewTerminal(protocol);
 
-    CPhoneDevice* device = new CPhoneDevice(vm, pThis, MakeString(appPathStr), (uint64_t)netHandle, versionCode, MakeString(nativeLibraryDirStr));
+    CPhoneDevice* device = new CPhoneDevice(vm, pThis, appPathStr, (uint64_t)netHandle, versionCode, nativeLibraryDirStr);
     device->SetListener(pTerminal);
     device->UpdateSignalLevel(signalLevel);
     device->SetBuildTime(buildTime / 1000);
-    device->UpdateSimcard(MakeString(simcardStr));
-    device->UpdateTfCardPath(MakeString(tfCardPathStr));
+    device->UpdateSimcard(simcardStr);
+    device->UpdateTfCardPath(tfCardPathStr);
 
-    pTerminal->InitServerInfo(MakeString(appPathStr), MakeString(cmdidStr), MakeString(ipStr), port, udpOrTcp, encryptData);
+    pTerminal->InitServerInfo(appPathStr, cmdidStr, ipStr, port, udpOrTcp, encryptData);
     // pTerminal->SetPacketSize(1 * 1024);	// 1K
 #if defined(USING_NRSEC) && !defined(USING_NRSEC_VPN)
     pTerminal->InitEncryptionInfo(simcardStr, "/dev/spidev0.0", "");
@@ -386,12 +384,6 @@ Java_com_xypower_mpapp_MicroPhotoService_init(
 #ifdef _DEBUG
     ALOGD("Finish Startup");
 #endif
-    if (appPathStr != NULL) env->ReleaseStringUTFChars(appPath, appPathStr);
-    if (ipStr != NULL) env->ReleaseStringUTFChars(ip, ipStr);
-    if (cmdidStr != NULL) env->ReleaseStringUTFChars(cmdid, cmdidStr);
-    if (simcardStr != NULL) env->ReleaseStringUTFChars(simcard, simcardStr);
-    if (tfCardPathStr != NULL) env->ReleaseStringUTFChars(tfCardPath, tfCardPathStr);
-    if (nativeLibraryDirStr != NULL) env->ReleaseStringUTFChars(nativeLibraryDir, nativeLibraryDirStr);
 
     if (!res)
     {
@@ -492,11 +484,8 @@ Java_com_xypower_mpapp_MicroPhotoService_takePhoto(
     osds[2].text = cfg.osd.rightBottom;
     osds[3].text = cfg.osd.leftBottom;
 
-    const char* pathStr = env->GetStringUTFChars(path, 0);
-
-    device->TakePhoto(photoInfo, osds, MakeString(pathStr));
-
-    env->ReleaseStringUTFChars(path, pathStr);
+    std::string pathStr = jstring2string(env, path);
+    device->TakePhoto(photoInfo, osds, pathStr);
 
     // device->TurnOffCameraPower(NULL);
     // if (photoInfo.usbCamera)
@@ -730,9 +719,7 @@ Java_com_xypower_mpapp_MicroPhotoService_recoganizePicture(
         JNIEnv* env,
         jclass cls, jstring paramPath, jstring binPath, jstring blobName8, jstring blobName16, jstring blobName32, jstring picPath) {
 
-    const char* pParamPathStr = env->GetStringUTFChars(paramPath, 0);
-    std::string paramPathStr = MakeString(pParamPathStr);
-    env->ReleaseStringUTFChars(paramPath, pParamPathStr);
+    std::string paramPathStr = jstring2string(env, paramPath);
 
     const char* pBinPathStr = env->GetStringUTFChars(binPath, 0);
     std::string binPathStr = MakeString(pBinPathStr);