我正在尝试将 cv::LineSegmentDetector 集成到 opencv4nodejs，这是 opencv 的一个 Node 插件(链接:https://github.com/justadudewhohacks/opencv4nodejs)。我已经成功编译了一个由 require 加载的 opencv4nodejs 模块。最初在将 opencv4nodejs.node 模块加载到 js 时遇到了 opencv_core.dll 和 opencv_imgproc.dll 的问题。但是 cv::createLineSegmentDetector() 崩溃 catch( std::exception &e) 不起作用但 catch(...) 异常捕获它。但它仍然不起作用。

这是代码。

#include <nan.h> 
#include <opencv2/core.hpp> 
#include <opencv2/imgproc.hpp> 
#include "macros.h" 
 
class LineSegmentDetector : public Nan::ObjectWrap 
{ 
public: 
    cv::Ptr<cv::LineSegmentDetector> m_plsd; 
 
    static NAN_MODULE_INIT(Init); 
    static NAN_METHOD(New); 
    static NAN_METHOD(Detect); 
    static Nan::Persistent<v8::FunctionTemplate> constructor; 
}; 

#include "LineSegmentDetector.h" 
#include "Mat.h" 
#include "Vec4.h" 
 
Nan::Persistent<v8::FunctionTemplate> LineSegmentDetector::constructor; 
// Nan::Persistent<v8::FunctionTemplate> Mat::constructor; 
// Nan::Persistent<v8::FunctionTemplate> Vec4::constructor; 
 
NAN_MODULE_INIT(LineSegmentDetector::Init) 
{ 
    v8::Local<v8::FunctionTemplate> ctor = Nan::New<v8::FunctionTemplate>(LineSegmentDetector::New); 
    constructor.Reset(ctor); 
    ctor->InstanceTemplate()->SetInternalFieldCount(1); 
    ctor->SetClassName(Nan::New("LineSegmentDetector").ToLocalChecked()); 
 
    Nan::SetPrototypeMethod(ctor, "detect", LineSegmentDetector::Detect); 
 
    target->Set(Nan::New("LineSegmentDetector").ToLocalChecked(), ctor->GetFunction()); 
} 
 
std::string handle_eptr(std::exception_ptr eptr) // passing by value is ok 
{ 
    try 
    { 
        if (eptr) 
        { 
            std::rethrow_exception(eptr); 
        } 
    } 
    catch (const std::exception &e) 
    { 
        return std::string("Caught exception \"") + e.what() + std::string("\"\n"); 
    } 
} 
 
NAN_METHOD(LineSegmentDetector::New) 
{ 
    // throw an error if constructor is called without new keyword 
    if (!info.IsConstructCall()) 
    { 
        return Nan::ThrowError(Nan::New("LineSegmentDetector::New - called without new keyword").ToLocalChecked()); 
    } 
    LineSegmentDetector *self = new LineSegmentDetector(); 
    if (self == nullptr) 
    { 
        return Nan::ThrowError(Nan::New("LineSegmentDetector::New - self was null").ToLocalChecked()); 
    } 
    try 
    { 
        self->m_plsd = cv::createLineSegmentDetector(); 
    } 
    catch (...) 
    { 
        // std::exception_ptr eptr = std::current_exception(); 
        return Nan::ThrowError(Nan::New("LineSegmentDetector::New - cv::createLineSegmentDetector failed").ToLocalChecked()); 
    } 
    self->Wrap(info.Holder()); 
 
    // return the wrapped javascript instance 
    info.GetReturnValue().Set(info.Holder()); 
} 
 
NAN_METHOD(LineSegmentDetector::Detect) 
{ 
    FF::TryCatch tryCatch("LineSegmentDetector::Detect"); 
    cv::Mat gray; 
    if (Mat::Converter::arg(0, &gray, info)) 
    { 
        return tryCatch.reThrow(); 
    } 
 
    LineSegmentDetector *self = Nan::ObjectWrap::Unwrap<LineSegmentDetector>(info.This()); 
    std::vector<cv::Vec4f> lines; 
    self->m_plsd->detect(gray, lines); 
    v8::Local<v8::Value> val = Vec4::ArrayWithCastConverter<cv::Vec4f>::wrap(lines); 
    info.GetReturnValue().Set(val); 
} 

请您参考如下方法:

据我了解，我的代码没有问题，版本 3.4 中不存在实现。

   LineSegmentDetectorImpl::LineSegmentDetectorImpl(int _refine, double _scale, double _sigma_scale, double _quant, 
double _ang_th, double _log_eps, double _density_th, int _n_bins) 
{ 
CV_Assert(_scale > 0 && _sigma_scale > 0 && _quant >= 0 && 
_ang_th > 0 && _ang_th < 180 && _density_th >= 0 && _density_th < 1 && 
_n_bins > 0); 
CV_UNUSED(_refine); CV_UNUSED(_log_eps); 
CV_Error(Error::StsNotImplemented, "Implementation has been removed due original code license issues"); 
}