Add Windows form in visual c++ 2012
step1

step2

step3

step4

step5

step6
[STAThread]
void main(array<String^>^ args) {
Application::EnableVisualStyles();
Application::SetCompatibleTextRenderingDefault(false);
OpenCV_windows_from_gray::Form1 form;
Application::Run(%form);
}

step7
Modify the entry point

finish