#include <Application.h>#include <Screen.h>#include <stdio.h>#include <string.h>int main(){BApplication app("application/x-vnd.BScreenTest");BScreen screen;if (!screen.IsValid()) {printf("Invalid BScreen object\n");exit(-1);}display_mode oldMode;status_t status = screen.GetMode(&oldMode);if (status < B_OK)printf("%s\n", strerror(status));elseprintf("width: %d, height: %d, space: %lu\n",oldMode.virtual_width,oldMode.virtual_height,oldMode.space);printf("Screen frame: ");screen.Frame().PrintToStream();printf("\nTrying to set mode to 800x600: ");display_mode newMode = oldMode;newMode.virtual_width = 800;newMode.virtual_height = 600;status = screen.SetMode(&newMode);if (status < B_OK)printf("FAILED (%s)\n", strerror(status));else {printf("OK\n");status_t status = screen.GetMode(&newMode);if (status < B_OK)printf("%s\n", strerror(status));else {printf("width: %d, height: %d, space: %lu\n",newMode.virtual_width,newMode.virtual_height,newMode.space);printf("Screen frame: ");screen.Frame().PrintToStream();printf("\n");}}snooze(4000000);printf("resetting video mode: ");status = screen.SetMode(&oldMode);if (status < B_OK)printf("FAILED (%s)\n", strerror(status));elseprintf("OK\n");}