int (*lcd)[800] = NULL; //打开帧缓存设备文件 //映射内存 void lcd_lnit(){ int lcd_fd = open("/dev/fb0",O_RDWR); //系统io可以访问任何类型文件 if(lcd_fd < 0){ perror("打开lcd设备文件失败"); return ; } lcd = mmap(NULL,800 * 480 * 4,PROT_READ | PROT_WRITE,MAP_SHARED,lcd_fd,0); if(lcd == NULL){ perror("映射失败"); return ; } close(lcd_fd); } //打开bmp文件，把图片放到缓存区 void bmp_init(char *bmp_path){ int bmp_fd = open("./1.bmp",O_RDWR); if(bmp_fd <0){perror("打开图片失败");return ;} struct bitmap_header head; read(bmp_fd,&head,14); struct bitmap_info info; read(bmp_fd,&info,40); char rgb[800*480*3]; read(bmp_fd,&rgb,sizeof(rgb)); char argb[800*480*4]; for(int i = 0; i < 480 * 800 ;i++){ argb[0+i*4] = rgb[0+i*3]; argb[1+i*4] = rgb[1+i*3]; argb[2+i*4] = rgb[2+i*3]; argb[3+i*4] = 0; //透明度 } //转换成二维数组 int (*p)[800] = (void*)argb; for(int y = 0; y < 480; y++){ for(int x = 0; x < 800; x++){ lcd[y][x] = p[479-y][x]; } } close(bmp_fd); } //插入双向链表 struct node{ char path[1024]; struct node *next; struct node *prev; }; void insert_node(struct node *head,char *path){ //新建结点 struct node *xnew = malloc(sizeof(struct node)); //初始化数据域 strcpy(xnew -> path ,path); //初始化地址域 xnew -> next = xnew; xnew -> prev = xnew; //插入节点到链表中 xnew -> prev = head -> prev; xnew -> next = head; head -> prev -> next = xnew; head -> next = xnew; } //打开触摸屏设备文件 void event_init(struct node *pos){ int fd = open("/dev/input/event0",O_RDWR); if(fd < 0){perror("打开触摸屏设备文件失败");return ;} int tx,ty; int touch_x,touch_y; while(1){ struct input_event ev; read(fd,&ev,sizeof(ev)); if(ev.type == EV_SYN){ // printf("-----------SYN------------\n"); } if(ev.type == EV_ABS && ev.code == ABS_X){ // printf("x = %d\n",ev.value); //ev.value*800/1024 tx = ev.value; } if(ev.type == EV_ABS && ev.code == ABS_Y){ // printf("y = %d\n",ev.value); //ev.value*480/600 ty = ev.value; } if(ev.type == EV_KEY && ev.code == BTN_TOUCH){ if(ev.value > 0){ printf("按下x =%d,y=%d\n",tx,ty); touch_x = tx; touch_y = ty; } else{ printf("松开x =%d,y=%d\n",tx,ty); if(touch_x - tx < -100) {printf("向右滑动\n"); if(strcmp(pos -> path, "NULL") != 0){ pos = pos -> next; bmp_init(pos -> path); } } else if(touch_x -tx > 100) { printf("向左滑动\n"); if(strcmp(pos -> path, "NULL") != 0){ pos = pos -> prev; bmp_init(pos -> path); } } else if(touch_y - ty < -100) {printf("向下滑动\n");} else if(touch_y -ty > 100) {printf("向上滑动\n");} } } } close(fd); } //获取信息 //实现左右滑动显示坐标，根据向左划还是向右滑动切换图片 int main(){ //创建头节点 struct node *head = malloc(sizeof(struct node)); strcpy(head -> path,"NULL"); head -> next = head; head -> prev = head; //插入结点 insert_node(head,"dihuangxia1.bmp"); insert_node(head,"mouyitian.bmp"); lcd_lnit(); struct node *pos =head; event_init(pos); }为什么滑动之后没有显示图片