1：
int with = GetSystemMetrics(SM_CXSCREEN);
int heigh = GetSystemMetrics(SM_CYSCREEN);
int cap = GetSystemMetrics(SM_CYCAPTION); //获取标题栏宽度
2：
DEVMODE dm;
dm.dmSize = sizeof(DEVMODE);
EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
dm.dmPelsWidth = 1920; //这里实现分辨率的宽度
dm.dmPelsHeight = 1080; //分辨率的高度
LONG result = ChangeDisplaySettings(&dm, 0);
