C++ JEnv::GetStringUTFChars方法代码示例

vector<string> NativeScriptRuntime::GetTypeMetadata(const string& name, int index)
{
	JEnv env;

	string canonicalName = Util::ConvertFromJniToCanonicalName(name);

	JniLocalRef className(env.NewStringUTF(canonicalName.c_str()));
	jint idx = index;

	JniLocalRef pubApi(env.CallStaticObjectMethod(PlatformClass, GET_TYPE_METADATA, (jstring) className, idx));

	jsize length = env.GetArrayLength(pubApi);

	assert(length > 0);

	vector<string> result;

	for (jsize i=0; i<length; i++)
	{
		JniLocalRef s(env.GetObjectArrayElement(pubApi, i));
		const char *pc = env.GetStringUTFChars(s, nullptr);
		result.push_back(string(pc));
		env.ReleaseStringUTFChars(s, pc);
	}

	return result;
}

std::string ArgConverter::jstringToString(jstring value)
{
	if (value == nullptr) {
		return string();
	}

	jsize utfLength;
	bool readInBuffer = ReadJStringInBuffer(value, utfLength);
	if(readInBuffer) {
		string s(charBuffer, utfLength);
		return s;
	}

	JEnv env;

	jboolean f = false;
	const char* chars = env.GetStringUTFChars(value, &f);
	string s(chars);
	env.ReleaseStringUTFChars(value, chars);

	return s;
}

void FieldAccessor::SetJavaField(Isolate *isolate, const Local<Object>& target, const Local<Value>& value, FieldCallbackData *fieldData)
{
	JEnv env;

	HandleScope handleScope(isolate);
	auto runtime = Runtime::GetRuntime(isolate);
	auto objectManager = runtime->GetObjectManager();

	JniLocalRef targetJavaObject;

	const auto& fieldTypeName = fieldData->signature;
	auto isStatic = fieldData->isStatic;

	auto isPrimitiveType = fieldTypeName.size() == 1;
	auto isFieldArray = fieldTypeName[0] == '[';

	if (fieldData->fid == nullptr)
	{
		auto fieldJniSig = isPrimitiveType
							? fieldTypeName
								:
								(isFieldArray
									? fieldTypeName
										:
										("L" + fieldTypeName + ";"));

		if (isStatic)
		{
			fieldData->clazz = env.FindClass(fieldData->declaringType);
			assert(fieldData->clazz != nullptr);
			fieldData->fid = env.GetStaticFieldID(fieldData->clazz, fieldData->name, fieldJniSig);
			assert(fieldData->fid != nullptr);
		}
		else
		{
			fieldData->clazz = env.FindClass(fieldData->declaringType);
			assert(fieldData->clazz != nullptr);
			fieldData->fid = env.GetFieldID(fieldData->clazz, fieldData->name, fieldJniSig);
			assert(fieldData->fid != nullptr);
		}
	}

	if (!isStatic)
	{
		targetJavaObject = objectManager->GetJavaObjectByJsObject(target);

		if (targetJavaObject.IsNull())
		{
			stringstream ss;
			ss << "Cannot access property '" << fieldData->name << "' because there is no corresponding Java object";
			throw NativeScriptException(ss.str());
		}
	}

	auto fieldId = fieldData->fid;
	auto clazz = fieldData->clazz;

	if (isPrimitiveType)
	{
		switch (fieldTypeName[0])
		{
			case 'Z': //bool
			{
				//TODO: validate value is a boolean before calling
				if (isStatic)
				{
					env.SetStaticBooleanField(clazz, fieldId, value->BooleanValue());
				}
				else
				{
					env.SetBooleanField(targetJavaObject, fieldId, value->BooleanValue());
				}
				break;
			}
			case 'B': //byte
			{
				//TODO: validate value is a byte before calling
				if (isStatic)
				{
					env.SetStaticByteField(clazz, fieldId, value->Int32Value());
				}
				else
				{
					env.SetByteField(targetJavaObject, fieldId, value->Int32Value());
				}
				break;
			}
			case 'C': //char
			{
				//TODO: validate value is a single char
				String::Utf8Value stringValue(value->ToString());
				JniLocalRef value(env.NewStringUTF(*stringValue));
				const char* chars = env.GetStringUTFChars(value, 0);

				if (isStatic)
				{
					env.SetStaticCharField(clazz, fieldId, chars[0]);
				}
				else
				{
//.........这里部分代码省略.........

//.........这里部分代码省略.........
					result = env.GetBooleanField(targetJavaObject, fieldId);
				}
				fieldResult = Boolean::New(isolate, (result == JNI_TRUE));
				break;
			}
			case 'B': //byte
			{
				jbyte result;
				if (isStatic)
				{
					result = env.GetStaticByteField(clazz, fieldId);
				}
				else
				{
					result = env.GetByteField(targetJavaObject, fieldId);
				}
				fieldResult = handleScope.Escape(Int32::New(isolate, result));
				break;
			}
			case 'C': //char
			{
				jchar result;
				if (isStatic)
				{
					result = env.GetStaticCharField(clazz, fieldId);
				}
				else
				{
					result = env.GetCharField(targetJavaObject, fieldId);
				}

				JniLocalRef str(env.NewString(&result, 1));
				jboolean bol = true;
				const char* resP = env.GetStringUTFChars(str, &bol);
				fieldResult = handleScope.Escape(ConvertToV8String(resP, 1));
				env.ReleaseStringUTFChars(str, resP);
				break;
			}
			case 'S': //short
			{
				jshort result;
				if (isStatic)
				{
					result = env.GetStaticShortField(clazz, fieldId);
				}
				else
				{
					result = env.GetShortField(targetJavaObject, fieldId);
				}
				fieldResult = handleScope.Escape(Int32::New(isolate, result));
				break;
			}
			case 'I': //int
			{
				jint result;
				if (isStatic)
				{
					result = env.GetStaticIntField(clazz, fieldId);
				}
				else
				{
					result = env.GetIntField(targetJavaObject, fieldId);
				}
				fieldResult = handleScope.Escape(Int32::New(isolate, result));
				break;

void FieldAccessor::SetJavaField(const Local<Object>& target, const Local<Value>& value, FieldCallbackData *fieldData)
{
	JEnv env;

	auto isolate = Isolate::GetCurrent();
	HandleScope handleScope(isolate);

	jweak targetJavaObject;

	const auto& fieldTypeName = fieldData->signature;
	auto isStatic = fieldData->isStatic;

	auto isPrimitiveType = fieldTypeName.size() == 1;
	auto isFieldArray = fieldTypeName[0] == '[';


	if (fieldData->fid == nullptr)
	{
		auto fieldJniSig = isPrimitiveType
								? fieldTypeName
								: (isFieldArray
									? fieldTypeName
									: ("L" + fieldTypeName + ";"));

		if (isStatic)
		{
			fieldData->clazz = env.FindClass(fieldData->declaringType);
			assert(fieldData->clazz != nullptr);
			fieldData->fid = env.GetStaticFieldID(fieldData->clazz, fieldData->name, fieldJniSig);
			assert(fieldData->fid != nullptr);
		}
		else
		{
			fieldData->clazz = env.FindClass(fieldData->declaringType);
			assert(fieldData->clazz != nullptr);
			fieldData->fid = env.GetFieldID(fieldData->clazz, fieldData->name, fieldJniSig);
			assert(fieldData->fid != nullptr);
		}
	}

	if (!isStatic)
	{
		targetJavaObject = objectManager->GetJavaObjectByJsObject(target);
	}

	auto fieldId = fieldData->fid;
	auto clazz = fieldData->clazz;

	if (isPrimitiveType)
	{
		switch (fieldTypeName[0])
		{
			case 'Z': //bool
			{
				//TODO: validate value is a boolean before calling
				if (isStatic)
				{
					env.SetStaticBooleanField(clazz, fieldId, value->BooleanValue());
				}
				else
				{
					env.SetBooleanField(targetJavaObject, fieldId, value->BooleanValue());
				}
				break;
			}
			case 'B': //byte
			{
				//TODO: validate value is a byte before calling
				if (isStatic)
				{
					env.SetStaticByteField(clazz, fieldId, value->Int32Value());
				}
				else
				{
					env.SetByteField(targetJavaObject, fieldId, value->Int32Value());
				}
				break;
			}
			case 'C': //char
			{
				//TODO: validate value is a single char
				String::Utf8Value stringValue(value->ToString());
				JniLocalRef value(env.NewStringUTF(*stringValue));
				const char* chars = env.GetStringUTFChars(value, 0);

				if (isStatic)
				{
					env.SetStaticCharField(clazz, fieldId, chars[0]);
				}
				else
				{
					env.SetCharField(targetJavaObject, fieldId, chars[0]);
				}
				env.ReleaseStringUTFChars(value, chars);
				break;
			}
			case 'S': //short
			{
				//TODO: validate value is a short before calling
				if (isStatic)
//.........这里部分代码省略.........

Local<Value> ArrayElementAccessor::GetArrayElement(const Local<Object>& array, uint32_t index, const string& arraySignature)
{
	JEnv env;

	Isolate* isolate = Isolate::GetCurrent();
	EscapableHandleScope handleScope(isolate);

	jweak arr = objectManager->GetJavaObjectByJsObject(array);

	Local<Value> value;
	jsize startIndex = index;
	const jsize length = 1;

	const string elementSignature = arraySignature.substr(1);
	jboolean isCopy = false;

	if (elementSignature == "Z")
	{
		jbooleanArray boolArr = reinterpret_cast<jbooleanArray>(arr);
		jboolean boolArrValue;
		env.GetBooleanArrayRegion(boolArr, startIndex, length, &boolArrValue);
		value = ConvertToJsValue(env, elementSignature, &boolArrValue);
	}
	else if (elementSignature == "B")
	{
		jbyteArray byteArr = reinterpret_cast<jbyteArray>(arr);
		jbyte byteArrValue;
		env.GetByteArrayRegion(byteArr, startIndex, length, &byteArrValue);
		value = ConvertToJsValue(env, elementSignature, &byteArrValue);
	}
	else if (elementSignature == "C")
	{
		jcharArray charArr = reinterpret_cast<jcharArray>(arr);
		jchar charArrValue;
		env.GetCharArrayRegion(charArr, startIndex, length, &charArrValue);
		JniLocalRef s(env.NewString(&charArrValue, 1));
		const char* singleChar = env.GetStringUTFChars(s, &isCopy);
		value = ConvertToJsValue(env, elementSignature, singleChar);
		env.ReleaseStringUTFChars(s, singleChar);
	}
	else if (elementSignature == "S")
	{
		jshortArray shortArr = reinterpret_cast<jshortArray>(arr);
		jshort shortArrValue;
		env.GetShortArrayRegion(shortArr, startIndex, length, &shortArrValue);
		value = ConvertToJsValue(env, elementSignature, &shortArrValue);
	}
	else if (elementSignature == "I")
	{
		jintArray intArr = reinterpret_cast<jintArray>(arr);
		jint intArrValue;
		env.GetIntArrayRegion(intArr, startIndex, length, &intArrValue);
		value = ConvertToJsValue(env, elementSignature, &intArrValue);
	}
	else if (elementSignature == "J")
	{
		jlongArray longArr = reinterpret_cast<jlongArray>(arr);
		jlong longArrValue;
		env.GetLongArrayRegion(longArr, startIndex, length, &longArrValue);
		value = ConvertToJsValue(env, elementSignature, &longArrValue);
	}
	else if (elementSignature == "F")
	{
		jfloatArray floatArr = reinterpret_cast<jfloatArray>(arr);
		jfloat floatArrValue;
		env.GetFloatArrayRegion(floatArr, startIndex, length, &floatArrValue);
		value = ConvertToJsValue(env, elementSignature, &floatArrValue);
	}
	else if (elementSignature == "D")
	{
		jdoubleArray doubleArr = reinterpret_cast<jdoubleArray>(arr);
		jdouble doubleArrValue;
		env.GetDoubleArrayRegion(doubleArr, startIndex, length, &doubleArrValue);
		value = ConvertToJsValue(env, elementSignature, &doubleArrValue);
	}
	else
	{
		jobject result = env.GetObjectArrayElement(reinterpret_cast<jobjectArray>(arr), index);
		value = ConvertToJsValue(env, elementSignature, &result);
		env.DeleteLocalRef(result);
	}

	return handleScope.Escape(value);
}

void ArrayElementAccessor::SetArrayElement(const Local<Object>& array, uint32_t index, const string& arraySignature, Local<Value>& value)
{
	JEnv env;

	Isolate* isolate = Isolate::GetCurrent();
	HandleScope handleScope(isolate);

	jweak arr = objectManager->GetJavaObjectByJsObject(array);

	const string elementSignature = arraySignature.substr(1);
	jboolean isCopy = false;

	if (elementSignature == "Z") //bool
	{
		jboolean boolElementValue = (jboolean) value->BooleanValue();
		jbooleanArray boolArr = reinterpret_cast<jbooleanArray>(arr);
		env.SetBooleanArrayRegion(boolArr, index, 1, &boolElementValue);
	}
	else if (elementSignature == "B") //byte
	{
		jbyte byteElementValue = (jbyte) value->Int32Value();
		jbyteArray byteArr = reinterpret_cast<jbyteArray>(arr);
		env.SetByteArrayRegion(byteArr, index, 1, &byteElementValue);
	}
	else if (elementSignature == "C") //char
	{
		String::Utf8Value utf8(value->ToString());
		JniLocalRef s(env.NewString((jchar*) *utf8, 1));
		const char* singleChar = env.GetStringUTFChars(s, &isCopy);
		jchar charElementValue = *singleChar;
		env.ReleaseStringUTFChars(s, singleChar);
		jcharArray charArr = reinterpret_cast<jcharArray>(arr);
		env.SetCharArrayRegion(charArr, index, 1, &charElementValue);
	}
	else if (elementSignature == "S") //short
	{
		jshort shortElementValue = (jshort) value->Int32Value();
		jshortArray shortArr = reinterpret_cast<jshortArray>(arr);
		env.SetShortArrayRegion(shortArr, index, 1, &shortElementValue);
	}
	else if (elementSignature == "I") //int
	{
		jint intElementValue = value->Int32Value();
		jintArray intArr = reinterpret_cast<jintArray>(arr);
		env.SetIntArrayRegion(intArr, index, 1, &intElementValue);
	}
	else if (elementSignature == "J") //long
	{
		jlong longElementValue;
		if (value->IsObject())
		{
			longElementValue = (jlong) ArgConverter::ConvertToJavaLong(value);
		}
		else
		{
			longElementValue = (jlong) value->IntegerValue();
		}
		jlongArray longArr = reinterpret_cast<jlongArray>(arr);
		env.SetLongArrayRegion(longArr, index, 1, &longElementValue);
	}
	else if (elementSignature == "F") //float
	{
		jfloat floatElementValue = (jfloat) value->NumberValue();
		jfloatArray floatArr = reinterpret_cast<jfloatArray>(arr);
		env.SetFloatArrayRegion(floatArr, index, 1, &floatElementValue);
	}
	else if (elementSignature == "D") //double
	{
		jdouble doubleElementValue = (jdouble) value->NumberValue();
		jdoubleArray doubleArr = reinterpret_cast<jdoubleArray>(arr);
		env.SetDoubleArrayRegion(doubleArr, index, 1, &doubleElementValue);
	}
	else //string or object
	{
		bool isReferenceType = value->IsObject() || value->IsString();
		if (isReferenceType)
		{
			auto object = value.As<Object>();

			JsArgToArrayConverter argConverter(value, false, (int)Type::Null);
			if (argConverter.IsValid())
			{
				jobjectArray objArr = reinterpret_cast<jobjectArray>(arr);
				jobject objectElementValue = argConverter.GetConvertedArg();
				env.SetObjectArrayElement(objArr, index, objectElementValue);
			}
			else
			{
				JsArgToArrayConverter::Error err = argConverter.GetError();
				throw NativeScriptException(string(err.msg));
			}
		}
		else
		{
			throw NativeScriptException(string("Cannot assign primitive value to array of objects."));
		}
	}
}

//.........这里部分代码省略.........
			if (isStatic)
			{
				result = env.CallStaticByteMethodA(clazz, mid, javaArgs);
			}
			else if (isSuper)
			{
				result = env.CallNonvirtualByteMethodA(callerJavaObject, clazz, mid, javaArgs);
			}
			else
			{
				result = env.CallByteMethodA(callerJavaObject, mid, javaArgs);
			}
			args.GetReturnValue().Set(result);
			break;
		}
		case MethodReturnType::Char:
		{
			jchar result;
			if (isStatic)
			{
				result = env.CallStaticCharMethodA(clazz, mid, javaArgs);
			}
			else if (isSuper)
			{
				result = env.CallNonvirtualCharMethodA(callerJavaObject, clazz, mid, javaArgs);
			}
			else
			{
				result = env.CallCharMethodA(callerJavaObject, mid, javaArgs);
			}

			JniLocalRef str(env.NewString(&result, 1));
			jboolean bol = true;
			const char* resP = env.GetStringUTFChars(str, &bol);
			args.GetReturnValue().Set(ConvertToV8String(resP, 1));
			env.ReleaseStringUTFChars(str, resP);
			break;
		}
		case MethodReturnType::Short:
		{
			jshort result;
			if (isStatic)
			{
				result = env.CallStaticShortMethodA(clazz, mid, javaArgs);
			}
			else if (isSuper)
			{
				result = env.CallNonvirtualShortMethodA(callerJavaObject, clazz, mid, javaArgs);
			}
			else
			{
				result = env.CallShortMethodA(callerJavaObject, mid, javaArgs);
			}
			args.GetReturnValue().Set(result);
			break;
		}
		case MethodReturnType::Int:
		{
			jint result;
			if (isStatic)
			{
				result = env.CallStaticIntMethodA(clazz, mid, javaArgs);
			}
			else if (isSuper)
			{
				result = env.CallNonvirtualIntMethodA(callerJavaObject, clazz, mid, javaArgs);

//.........这里部分代码省略.........
			if (isStatic)
			{
				result = env.CallStaticByteMethodA(clazz, mid, javaArgs);
			}
			else if (isSuper)
			{
				result = env.CallNonvirtualByteMethodA(callerJavaObject, clazz, mid, javaArgs);
			}
			else
			{
				result = env.CallByteMethodA(callerJavaObject, mid, javaArgs);
			}
			args.GetReturnValue().Set(result);
			break;
		}
		case 'C': //char
		{
			jchar result;
			if (isStatic)
			{
				result = env.CallStaticCharMethodA(clazz, mid, javaArgs);
			}
			else if (isSuper)
			{
				result = env.CallNonvirtualCharMethodA(callerJavaObject, clazz, mid, javaArgs);
			}
			else
			{
				result = env.CallCharMethodA(callerJavaObject, mid, javaArgs);
			}

			JniLocalRef str(env.NewString(&result, 1));
			jboolean bol = true;
			const char* resP = env.GetStringUTFChars(str, &bol);
			args.GetReturnValue().Set(ConvertToV8String(resP, 1));
			env.ReleaseStringUTFChars(str, resP);
			break;
		}
		case 'S': //short
		{
			jshort result;
			if (isStatic)
			{
				result = env.CallStaticShortMethodA(clazz, mid, javaArgs);
			}
			else if (isSuper)
			{
				result = env.CallNonvirtualShortMethodA(callerJavaObject, clazz, mid, javaArgs);
			}
			else
			{
				result = env.CallShortMethodA(callerJavaObject, mid, javaArgs);
			}
			args.GetReturnValue().Set(result);
			break;
		}
		case 'I': //int
		{
			jint result;
			if (isStatic)
			{
				result = env.CallStaticIntMethodA(clazz, mid, javaArgs);
			}
			else if (isSuper)
			{
				result = env.CallNonvirtualIntMethodA(callerJavaObject, clazz, mid, javaArgs);