cvSetTrackbarMax  168 modules/highgui/include/opencv2/highgui/highgui_c.h CVAPI(void) cvSetTrackbarMax(const char* trackbar_name, const char* window_name, int maxval);
cvSetTrackbarMax  211 modules/highgui/src/window.cpp     cvSetTrackbarMax(trackbarName.c_str(), winName.c_str(), maxval);