# Newbie question about GUI in conbination with gen~and Juce **URL:** \ **Category:** Audio Plugins\ **Created:** [January 25, 2018, 6:27pm UTC](https://forum.juce.com/t/newbie-question-about-gui-in-conbination-with-gen-and-juce/26125 "2018-01-25T18:27:14Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![amsyn](https://avatars.discourse-cdn.com/v4/letter/a/b9e5f3/32.png) [@amsyn](https://forum.juce.com/u/amsyn)\ **Post date:** [January 25, 2018, 6:27pm UTC](https://forum.juce.com/t/newbie-question-about-gui-in-conbination-with-gen-and-juce/26125/1 "2018-01-25T18:27:14Z")
Hello, i’am an absolut beginner with Juce and C++. I build an Audio plugin in Max/gen~ and i want automate my sliders/dials in my DAW as AU/VST. The plugin works, it opens and make sound and the params to be automate are shown in Live but they are not accessible. I use these lines of code: In PluginProcessor.cpp sliderAttach = new AudioProcessorValueTreeState::SliderAttachment (processor.treeState, GAIN\_ID, inputDial); In PluginProsessor.cpp C74GenAudioProcessor::C74GenAudioProcessor() : m\_CurrentBufferSize(0), treeState(\*this, nullptr) In PluginEditor.h i use this: ScopedPointer AudioProcessorValueTreeState::SliderAttachment sliderAttach; In PluginProcessor.h #define GAIN\_ID “inputDial” #define GAIN\_NAME "inputDial" AudioProcessorValueTreeState treeState; Xcode give these errors back: No matching constructor for initialization of 'AudioProcessorValueTreeState::SliderAttachment’ Errors in juce\_AudioProcessorValueTreeState.h 1. Candidate constructor not viable: no known conversion from ‘ScopedPointerjuce::Slider’ to ‘juce::Slider &’ for 3rd argument 2. Candidate constructor not viable: requires 1 argument, but 3 were provided I stuck here. I hope this is a simple error 🙂 cheers in advance and best from Hamburg ---
**Author:** ![ed95](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/ed95/32/7635_2.png) [@ed95](https://forum.juce.com/u/ed95)\ **Post date:** [January 26, 2018, 9:04am UTC](https://forum.juce.com/t/newbie-question-about-gui-in-conbination-with-gen-and-juce/26125/2 "2018-01-26T09:04:10Z")
It’s difficult to figure out what’s going on without seeing more code (also please format your code properly by surrounding it with ``` or indenting by 4 spaces!) But it looks like your are passing a `ScopedPointer` to an `AudioProcessorValueTreeState::SliderAttachment` when it expects a reference, so you need to dereference it by using \*. ---
**Author:** ![amsyn](https://avatars.discourse-cdn.com/v4/letter/a/b9e5f3/32.png) [@amsyn](https://forum.juce.com/u/amsyn)\ **Post date:** [January 26, 2018, 12:06pm UTC](https://forum.juce.com/t/newbie-question-about-gui-in-conbination-with-gen-and-juce/26125/3 "2018-01-26T12:06:53Z")
Hello ed95, cheers for your reply 🙂 I try to format more Code, i hope it`s enough to see what happens here . 🙂 PluginProcessor.cpp ```auto C74GenAudioProcessor::C74GenAudioProcessor() : m_CurrentBufferSize(0), treeState(*this, nullptr) { // use a default samplerate and vector size here, reset it later m_C74PluginState = (CommonState *)C74_GENPLUGIN::create(44100, 64); C74_GENPLUGIN::reset(m_C74PluginState); m_InputBuffers = new t_sample *[C74_GENPLUGIN::num_inputs()]; m_OutputBuffers = new t_sample *[C74_GENPLUGIN::num_outputs()]; for (int i = 0; i < C74_GENPLUGIN::num_inputs(); i++) { m_InputBuffers[i] = NULL; } for (int i = 0; i < C74_GENPLUGIN::num_outputs(); i++) { m_OutputBuffers[i] = NULL; } NormalisableRange gainRange (0.0f, 1.0f); treeState.createAndAddParameter(GAIN_ID, GAIN_NAME, GAIN_NAME, gainRange, 1.0f, nullptr, nullptr); NormalisableRange depthRange (0.0f, 15.0f); treeState.createAndAddParameter(Depth_ID, Depth_NAME, Depth_NAME, depthRange, 10.0f, nullptr, nullptr); } ``` PluginProcessor.h ```auto #define GAIN_ID "inputDial" #define GAIN_NAME "inputDial" #define Depth_ID "depth" #define Depth_NAME "depth" //============================================================================== /** */ class C74GenAudioProcessor : public AudioProcessor { public: //============================================================================== C74GenAudioProcessor(); ~C74GenAudioProcessor(); //============================================================================== void prepareToPlay (double sampleRate, int samplesPerBlock) override; void releaseResources() override; void processBlock (AudioSampleBuffer&, MidiBuffer&) override; //============================================================================== AudioProcessorEditor* createEditor() override; bool hasEditor() const override; //============================================================================== const String getName() const override; int getNumParameters() override; float getParameter (int index) override; void setParameter (int index, float newValue) override; const String getParameterName (int index) override; const String getParameterText (int index) override; const String getInputChannelName (int channelIndex) const override; const String getOutputChannelName (int channelIndex) const override; bool isInputChannelStereoPair (int index) const override; bool isOutputChannelStereoPair (int index) const override; bool acceptsMidi() const override; bool producesMidi() const override; bool silenceInProducesSilenceOut() const override; double getTailLengthSeconds() const override; //============================================================================== int getNumPrograms() override; int getCurrentProgram() override; void setCurrentProgram (int index) override; const String getProgramName (int index) override; void changeProgramName (int index, const String& newName) override; //============================================================================== void getStateInformation (MemoryBlock& destData) override; void setStateInformation (const void* data, int sizeInBytes) override; AudioProcessorValueTreeState treeState; ``` PluginEditor.cpp ```auto C74GenAudioProcessorEditor::C74GenAudioProcessorEditor (C74GenAudioProcessor& p) : AudioProcessorEditor (&p), processor (p) { //[Constructor_pre] You can add your own custom stuff here.. //[/Constructor_pre] sliderAttach = new AudioProcessorValueTreeState::SliderAttachment (processor.treeState, GAIN_ID, inputDial); addAndMakeVisible (inputDial = new Slider ("inputDial")); inputDial->setRange (0, 1, 0.01); inputDial->setSliderStyle (Slider::RotaryHorizontalVerticalDrag); inputDial->setTextBoxStyle (Slider::TextBoxBelow, false, 58, 20); inputDial->setColour (Slider::thumbColourId, Colour (0xff5c6061)); inputDial->setColour (Slider::rotarySliderFillColourId, Colour (0xff57588b)); inputDial->setColour (Slider::rotarySliderOutlineColourId, Colour (0xff444646)); inputDial->setColour (Slider::textBoxTextColourId, Colour (0xffa7aaa9)); inputDial->setColour (Slider::textBoxOutlineColourId, Colour (0x002b2c2c)); inputDial->addListener (this); } PluginEditor.h ``` #include “…/JuceLibraryCode/JuceHeader.h” #include “PluginProcessor.h” //============================================================================== /\*\* \*/ class C74GenAudioProcessorEditor : public AudioProcessorEditor, public Slider::Listener, public Button::Listener { public: C74GenAudioProcessorEditor (C74GenAudioProcessor&); ~C74GenAudioProcessorEditor(); ``` //============================================================================== void paint (Graphics&) override; void resized() override; void sliderValueChanged (Slider* sliderThatWasMoved) override; void buttonClicked (Button* buttonThatWasClicked) override; ScopedPointer sliderAttach; // Binary resources: static const char* dialBackround_jpg; static const int dialBackround_jpgSize; ``` private: // This reference is provided as a quick way for your editor to // access the processor object that created it. C74GenAudioProcessor& processor; ``` ScopedPointer delayDial; ScopedPointer depthDial; ScopedPointer rateDial; ScopedPointer spreadDial; ScopedPointer phaseLevelDial; ScopedPointer crossDial; ScopedPointer offsetDial; ScopedPointer inputDial; ScopedPointer feedbackDial; ScopedPointer noiseButton; ScopedPointer deflectionButton; Image cachedImage_dialBackround_jpg_1; Image cachedImage_dialBackround_jpg_2; Image cachedImage_dialBackround_jpg_3; Image cachedImage_dialBackround_jpg_4; Image cachedImage_dialBackround_jpg_5; Image cachedImage_dialBackround_jpg_6; Image cachedImage_dialBackround_jpg_7; Image cachedImage_dialBackround_jpg_8; Image cachedImage_dialBackround_jpg_9; JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (C74GenAudioProcessorEditor) ``` }; ```auto ``` ---
**Author:** ![ed95](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/ed95/32/7635_2.png) [@ed95](https://forum.juce.com/u/ed95)\ **Post date:** [January 26, 2018, 12:11pm UTC](https://forum.juce.com/t/newbie-question-about-gui-in-conbination-with-gen-and-juce/26125/4 "2018-01-26T12:11:07Z")
Like I said before, in this line: ```auto sliderAttach = new AudioProcessorValueTreeState::SliderAttachment (processor.treeState, GAIN_ID, inputDial); ``` you are passing a `ScopedPointer` as the 3rd argument to the `AudioProcessorValueTreeState::SliderAttachment` constructor when it is expecting a `Slider&` so you need to dereference `inputDial` like this: ```auto sliderAttach = new AudioProcessorValueTreeState::SliderAttachment (processor.treeState, GAIN_ID, *inputDial); ``` ---
**Author:** ![amsyn](https://avatars.discourse-cdn.com/v4/letter/a/b9e5f3/32.png) [@amsyn](https://forum.juce.com/u/amsyn)\ **Post date:** [January 26, 2018, 1:06pm UTC](https://forum.juce.com/t/newbie-question-about-gui-in-conbination-with-gen-and-juce/26125/5 "2018-01-26T13:06:33Z")
The Compiler error is now gone but now Live crashes instantly when i open the plugin. Following errors from Live: ```auto Application Specific Information: dyld: in dlopen() Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.cycling74.C74GenPlugin 0x000000012afa857c juce::ScopedPointer::operator->() const + 12 (juce_ScopedPointer.h:173) 1 com.cycling74.C74GenPlugin 0x000000012af9c98b juce::Slider::setRange(double, double, double) + 43 (juce_Slider.cpp:1478) 2 com.cycling74.C74GenPlugin 0x000000012acd00b7 juce::AudioProcessorValueTreeState::SliderAttachment::Pimpl::Pimpl(juce::AudioProcessorValueTreeState&, juce::String const&, juce::Slider&) + 343 (juce_AudioProcessorValueTreeState.cpp:416) 3 com.cycling74.C74GenPlugin 0x000000012acbbfed juce::AudioProcessorValueTreeState::SliderAttachment::Pimpl::Pimpl(juce::AudioProcessorValueTreeState&, juce::String const&, juce::Slider&) + 45 (juce_AudioProcessorValueTreeState.cpp:424) 4 com.cycling74.C74GenPlugin 0x000000012acbbf73 juce::AudioProcessorValueTreeState::SliderAttachment::SliderAttachment(juce::AudioProcessorValueTreeState&, juce::String const&, juce::Slider&) + 99 (juce_AudioProcessorValueTreeState.cpp:461) 5 com.cycling74.C74GenPlugin 0x000000012acbc07d juce::AudioProcessorValueTreeState::SliderAttachment::SliderAttachment(juce::AudioProcessorValueTreeState&, juce::String const&, juce::Slider&) + 45 (juce_AudioProcessorValueTreeState.cpp:463) 6 com.cycling74.C74GenPlugin 0x000000012ac4c6fa C74GenAudioProcessorEditor::C74GenAudioProcessorEditor(C74GenAudioProcessor&) + 906 (PluginEditor.cpp:24) 7 com.cycling74.C74GenPlugin 0x000000012ac4f8bd C74GenAudioProcessorEditor::C74GenAudioProcessorEditor(C74GenAudioProcessor&) + 29 (PluginEditor.cpp:155) 8 com.cycling74.C74GenPlugin 0x000000012ac4bd4d C74GenAudioProcessor::createEditor() + 61 (PluginProcessor.cpp:232) 9 com.cycling74.C74GenPlugin 0x000000012aca865d juce::AudioProcessor::createEditorIfNeeded() + 93 (juce_AudioProcessor.cpp:1013) 10 com.cycling74.C74GenPlugin 0x000000012ac17a44 JuceAU::JuceUICreationClass::uiViewForAudioUnit(objc_object*, objc_selector*, ComponentInstanceRecord*, CGSize) + 116 (juce_AU_Wrapper.mm:1620) ``` damned 😃 I think we are on the right way…thanks a lot ed95 😉 ---
**Author:** ![ed95](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/ed95/32/7635_2.png) [@ed95](https://forum.juce.com/u/ed95)\ **Post date:** [January 26, 2018, 2:03pm UTC](https://forum.juce.com/t/newbie-question-about-gui-in-conbination-with-gen-and-juce/26125/6 "2018-01-26T14:03:11Z")
You need to swap these lines: ```auto sliderAttach = new AudioProcessorValueTreeState::SliderAttachment (processor.treeState, GAIN_ID, inputDial); addAndMakeVisible (inputDial = new Slider ("inputDial")); ``` as your `inputDial` member isn’t pointing to anything valid when you pass it to the `SliderAttachment`. ---
**Author:** ![amsyn](https://avatars.discourse-cdn.com/v4/letter/a/b9e5f3/32.png) [@amsyn](https://forum.juce.com/u/amsyn)\ **Post date:** [January 27, 2018, 11:57am UTC](https://forum.juce.com/t/newbie-question-about-gui-in-conbination-with-gen-and-juce/26125/7 "2018-01-27T11:57:14Z")
Hello ed95, this works Live doesn’t crash now…cheers 🙂 The next challenge is to bring the params to work. I try to make a small vid to describe the problem. Many thanks to you…you win a Beer 🙂