1 //! \example tutorial-event-keyboard.cpp 2 #include <visp3/gui/vpDisplayOpenCV.h> 3 #include <visp3/gui/vpDisplayX.h> 4 #include <visp3/gui/vpDisplayGTK.h> 5 #include <visp3/gui/vpDisplayGDI.h> 6 #include <visp3/gui/vpDisplayD3D.h> 7 main()8int main() 9 { 10 vpImage<unsigned char> I(240, 320); // Create a black image 11 #if defined(VISP_HAVE_X11) 12 vpDisplay *d = new vpDisplayX; 13 #elif defined(VISP_HAVE_GTK) 14 vpDisplay *d = new vpDisplayGTK; 15 #elif defined(VISP_HAVE_GDI) 16 vpDisplay *d = new vpDisplayGDI; 17 #elif defined(VISP_HAVE_D3D9) 18 vpDisplay *d = new vpDisplayD3D; 19 #elif defined(VISP_HAVE_OPENCV) 20 vpDisplay *d = new vpDisplayOpenCV; 21 #else 22 std::cout << "Sorry, no video device is available" << std::endl; 23 return -1; 24 #endif 25 // Initialize the display with the image I. Display and image are 26 // now link together. 27 #ifdef VISP_HAVE_DISPLAY 28 d->init(I); 29 #endif 30 // Set the display background with image I content 31 vpDisplay::display(I); 32 // Flush the foreground and background display 33 vpDisplay::flush(I); 34 // Wait for keyboard event 35 std::cout << "Waiting a keyboard event..." << std::endl; 36 vpDisplay::getKeyboardEvent(I, true); 37 std::cout << "A keyboard event was detected" << std::endl; 38 // Non blocking keyboard event loop 39 int cpt_event = 0; 40 char key[10]; 41 std::cout << "Enter a non blocking keyboard event detection loop..." << std::endl; 42 do { 43 bool event = vpDisplay::getKeyboardEvent(I, &key[0], false); 44 if (event) { 45 std::cout << "Key detected: " << key << std::endl; 46 cpt_event ++; 47 } 48 vpTime::wait(5); // wait 5 ms 49 } while(cpt_event < 5); 50 #ifdef VISP_HAVE_DISPLAY 51 delete d; 52 #endif 53 } 54