Only "MidiDemo.h" crash

General JUCE discussion
1

I downloaded JUCE 7.0.0 and trying to run DemoRunner on Windows 10. However, only “MidiDemo.h” crash.
It crashes in the same way whether I use the one from the JUCE folder or the one I compiled myself.

Is this happening only with this version? Or am I doing something wrong?

2

Where does the program crash? Please provide a stack trace at the point of the crash, along with any steps you took to trigger the crash (e.g. clicking on a specific button, plugging in or disconnecting a MIDI device).

3

c

When click “MidiDemo.h”, it crash.

I am not very good at English and programming, so please let me know if I have made any mistakes

4

MidiDemo also not running for me from DemoRunner. When I build it (MacOS) it asserts in ListBox::checkModelPtrIsValid().
jassert ((model == nullptr) == (weakModelPtr.lock() == nullptr));
Quite a lot of changes in juce_ListBox.h/cpp. If I JUCE_DISABLE_ASSERTIONS, also fails in setModel. All works fine on JUCE 6

5

Thank you for reporting.

6

Thank you for replying, but MidiDemo still cannot run from DemoRunnner.

error
error1853×837 122 KB

7

You need to rebuild the DemoRunner using the develop branch. The change has not yet been merged to the master branch.

8

Using the develop branch, I found I had to adapt my “similar to MidiDemo” program to work, by not calling:

        MidiDeviceListBox (const String& name,
                           MidiDemo& contentComponent,
                           bool isInputDeviceList)
            : ListBox (name, this),
              parent (contentComponent),
              isInput (isInputDeviceList)
        {
            setModel (this);

but
calling initializing the ListBox after the parent had been instatiated:
i.e.

        MidiDeviceListBox (const String& name,
                           MidiDemo& contentComponent,
                           bool isInputDeviceList)
            : parent (contentComponent),
              isInput (isInputDeviceList)
        {
            juce::ListBox (name, this);
            setModel (this);

Perhaps this could also improve MidiDemo.h?
It tries to dereference parent within void ListBox::updateContent().