Qt编写的列车运行预警系统（包含.pro文件）。主要功能为收到定位信息并显示本车和前车的速度里程，对距离过近，紧急停车等情况做出报警。-Written in Qt train warning system (including the. Pro file). Main function is to receive location information and displays the speed of vehicles and mileage of the vehicle in front,