registerCallback function
When callback finish, you need to invoke unregisterCallback function by hand. OtherWise it will casue memory leak.
Implementation
void registerCallback(dynamic target, Function function, String functionName) {
if (target is! JObject) {
return;
}
Pointer<Void> targetPtr = target.pointer.cast<Void>();
Pointer<Utf8> targetName = target.className!.toNativeUtf8();
Pointer<Utf8> funNamePtr = functionName.toNativeUtf8();
CallBackManager.instance.registerCallBack(targetPtr, functionName, function);
registerNativeCallback(
targetPtr, targetName, funNamePtr, _callbackPtr, nativePort);
calloc.free(targetName);
calloc.free(funNamePtr);
}