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opencv:readimage Async - change newed mat to local class to try to prevent mem leak; also try-catch to signal failure through callback

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This commit is contained in:
Simon Hailes 2017-11-10 14:07:20 +00:00
parent fdd0c97a3c
commit 6d09f70367
1 changed files with 37 additions and 12 deletions
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49
src/OpenCV.cc
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@ -24,30 +24,54 @@ public:
Nan::AsyncWorker(callback),
buf(buf),
len(len),
flags(flags){
flags(flags),
success(0){
}
~AsyncImDecodeWorker() {
}
void Execute() {
// Local<Object> img_to_return =
// Nan::NewInstance(Nan::GetFunction(Nan::New(Matrix::constructor)).ToLocalChecked()).ToLocalChecked();
// img = Nan::ObjectWrap::Unwrap<Matrix>(img_to_return);
cv::Mat *mbuf = new cv::Mat(len, 1, CV_64FC1, buf);
outputmat = cv::imdecode(*mbuf, flags);
try{
// don't new; just have a local class which will be removed.
cv::Mat mbuf(len, 1, CV_64FC1, buf);
outputmat = cv::imdecode(mbuf, flags);
success = 1;
} catch(...){
success = 0;
}
}
void HandleOKCallback() {
Nan::HandleScope scope;
Local<Object> im_to_return= Nan::NewInstance(Nan::GetFunction(Nan::New(Matrix::constructor)).ToLocalChecked()).ToLocalChecked();
Matrix *img = Nan::ObjectWrap::Unwrap<Matrix>(im_to_return);
img->mat = outputmat;
if (success){
Nan::HandleScope scope;
try{
Local<Object> im_to_return= Nan::NewInstance(Nan::GetFunction(Nan::New(Matrix::constructor)).ToLocalChecked()).ToLocalChecked();
Matrix *img = Nan::ObjectWrap::Unwrap<Matrix>(im_to_return);
img->mat = outputmat;
Local<Value> argv[] = {
Nan::Null(),
im_to_return
};
Nan::TryCatch try_catch;
callback->Call(2, argv);
if (try_catch.HasCaught()) {
Nan::FatalException(try_catch);
}
return;
} catch (...){
}
}
// fall through here is !success or failed trying to callback.
Local<Value> argv[] = {
Nan::Null(),
im_to_return
Nan::New("C++ exception executing imdecode").ToLocalChecked(), // err
Nan::Null()
};
Nan::TryCatch try_catch;
@ -62,6 +86,7 @@ private:
unsigned len;
int flags;
cv::Mat outputmat;
int success;
//Matrix *img;
};