windows下OpenCV的两个常见报错项flann\saving.h error C4996

报错内容如下，

D:\OpenCV412\opencv-4.1.2\modules\flann\include\opencv2\flann\saving.h(101,1): error C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

遵守microsoft的安全规则，我一般项目中都不使用_CRT_SECURE_NO_WARNINGS，所以改原码，每次都改同样的地方，这次记录下，方便下次快速定位

在文件的第90行和92行，把

strcpy(header.signature, FLANN_SIGNATURE_);

strcpy(header.version, FLANN_VERSION_);

修改成

strcpy_s(header.signature, 16, FLANN_SIGNATURE_);

strcpy_s(header.version, 16, FLANN_VERSION_);

template<typename Distance>
void save_header(FILE* stream, const NNIndex<Distance>& index)
{
    IndexHeader header;
    memset(header.signature, 0, sizeof(header.signature));
    strcpy_s(header.signature, 16, FLANN_SIGNATURE_);   
    memset(header.version, 0, sizeof(header.version));
    strcpy_s(header.version, 16, FLANN_VERSION_);  
    header.data_type = Datatype<typename Distance::ElementType>::type();
    header.index_type = index.getType();
    header.rows = index.size();
    header.cols = index.veclen();
​
    std::fwrite(&header, sizeof(header),1,stream);
}
​