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InspectAppWithGammaRay.md

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React Native Desktop project support stopped..

There is a tool for inspecting Qt apps - GammaRay from KDAB It can be very convenient to investigate QQuickItems hierarchy in the app.

Building

Steps to build it (inside cloned src folder):

mkdir build
cd build
cmake -DCMAKE_PREFIX_PATH=PATH_TO_YOUR_QT_FOLDER/5.12.2/gcc_64/lib/cmake ..
make
make install

After build gammaray binary can be found in GAMMARAY_PATH/build/bin

Usage

  1. Start gammaray
  2. Open Attach tab in gammaray UI
  3. Set Access mode combo box to Out-of-process, local debugging only
  4. Start your react-native-desktop application
  5. Wait until it is listed in processes on gammaray Attach screen
  6. Press Attach button
  7. Wait until gammaray attached
  8. Select Quick scenestab and inspect QQuickItems hierarchy in your app

Troubleshooting

For Ubuntu

If you get a error on attaching gammaray to app, here is what can be done:

  1. edit /etc/sysctl.d/10-ptrace.conf and change the line: kernel.yama.ptrace_scope = 1 To kernel.yama.ptrace_scope = 0

  2. To apply changes call sudo service procps restart