铸造为矢量<2f>(Casting as a vector<2f>)
我正在使用OpenCV的highgui包括能够在我的图像上获得鼠标点击位置。 我已经定义了一个向量<2f>,我想存储已被点击的点,但不幸的是,我认为我做错了什么:
void on_mouse(int mouseEvent, int x, int y, int flags, void* param) { if( mouseEvent == CV_EVENT_LBUTTONDOWN) { printf("Clicked image at (%d,%d)\n", x, y); (vector<Point2f>*)param.push_back(Point2f(x,y)); } }我的编译器在param上给出了一个错误,并说错误:Expression必须具有类类型。 任何人都可以建议如何投射为矢量结构? 或者我做错了什么?
I'm using OpenCV's highgui include to be able to get mouse click locations on my image. I've defined a vector<2f> that I would like to store the points that have been clicked within, but unfortunately, I think I'm doing something wrong:
void on_mouse(int mouseEvent, int x, int y, int flags, void* param) { if( mouseEvent == CV_EVENT_LBUTTONDOWN) { printf("Clicked image at (%d,%d)\n", x, y); (vector<Point2f>*)param.push_back(Point2f(x,y)); } }My compiler gives me an error on param and says Error: Expression must have class type. Can anyone suggest how else to cast as a vector structure? or what I am doing incorrectly?
最满意答案
(vector<Point2f>*)param.push_back(Point2f(x,y));应该:
reinterpret_cast<vector<Point2f>*>(param)->push_back(Point2f(x,y)); (vector<Point2f>*)param.push_back(Point2f(x,y));Should be:
reinterpret_cast<vector<Point2f>*>(param)->push_back(Point2f(x,y));更多推荐
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