dart-ffi

问题 I'm trying to use Google Oboe for a 3D audio processing app due to it's low latency. The app will have a C++ backend, which does the processing, and the frontend is done with Flutter. I'm running a couple of tests to see if it'll work but I'm having issues loading assets from Flutter to Oboe. I checked the example RhythmGame in Oboe's repo, done with Java, but couldn't quiet find a way of doing that straight from Dart to C++. The connection between front and backend is through dart::ffi Here

问题 I've been trying to use the Android NDK's AssetManager class in my Flutter app, that works with Google Oboe, to access to audio files. Following this example in the Oboe repository, I learned that they obtain the AssetManager from Java like this: JNIEXPORT void JNICALL Java_com_google_oboe_sample_rhythmgame_MainActivity_native_1onStart(JNIEnv *env, jobject instance, jobject jAssetManager) { AAssetManager *assetManager = AAssetManager_fromJava(env, jAssetManager); if (assetManager == nullptr)

问题 I've been trying to use the Android NDK's AssetManager class in my Flutter app, that works with Google Oboe, to access to audio files. Following this example in the Oboe repository, I learned that they obtain the AssetManager from Java like this: JNIEXPORT void JNICALL Java_com_google_oboe_sample_rhythmgame_MainActivity_native_1onStart(JNIEnv *env, jobject instance, jobject jAssetManager) { AAssetManager *assetManager = AAssetManager_fromJava(env, jAssetManager); if (assetManager == nullptr)

问题 I've been trying to use the Android NDK's AssetManager class in my Flutter app, that works with Google Oboe, to access to audio files. Following this example in the Oboe repository, I learned that they obtain the AssetManager from Java like this: JNIEXPORT void JNICALL Java_com_google_oboe_sample_rhythmgame_MainActivity_native_1onStart(JNIEnv *env, jobject instance, jobject jAssetManager) { AAssetManager *assetManager = AAssetManager_fromJava(env, jAssetManager); if (assetManager == nullptr)

问题 My app's backend is written in C++ and the frontend in Dart/flutter. I'd love to have the backend notify frontend whenever data is ready. This requires implementing an async callback scheme between Dart and C++. Environment $ flutter doctor -v [✓] Flutter (Channel stable, 1.20.1, on Mac OS X 10.15.5 19F101, locale en-CN) • Flutter version 1.20.1 at /Applications/Android/flutter • Framework revision 2ae34518b8 (2 days ago), 2020-08-05 19:53:19 -0700 • Engine revision c8e3b94853 • Dart version

问题 I am trying to send an image to my Custom C++ code which I am planning to run using dart:ffi. I have successfully run the hello world problem where I send two integers and get the some of them as another intiger. Now I want to send a whole image to it and process it on my C++ code. I am able to get Uint8List from the CameraImage using the below code Future<ui.Image> convertCameraImageToUiImage(CameraImage image) async { imglib.Image libImage = imglib.Image.fromBytes( image.width, image.height

问题 I am trying to send an image to my Custom C++ code which I am planning to run using dart:ffi. I have successfully run the hello world problem where I send two integers and get the some of them as another intiger. Now I want to send a whole image to it and process it on my C++ code. I am able to get Uint8List from the CameraImage using the below code Future<ui.Image> convertCameraImageToUiImage(CameraImage image) async { imglib.Image libImage = imglib.Image.fromBytes( image.width, image.height

来源： https://stackoverflow.com/questions/60888021/dart-c-interoperability-pass-an-array-of-integers-to-c-function

来源： https://stackoverflow.com/questions/60888021/dart-c-interoperability-pass-an-array-of-integers-to-c-function

问题 Hello I am using dart:ffi to build an interface with my native c/c++ library. and I needed a way to get a callback from c to dart as an example in sqlite: int sqlite3_exec( sqlite3*, /* An open database */ const char *sql, /* SQL to be evaluated */ int (*callback)(void*,int,char**,char**), /* Callback function */ void *, /* 1st argument to callback */ char **errmsg /* Error msg written here */ ); the third parameter in sqlite3_exec is function pointer to a callback. so if I called this