用c语言写一个模块化的GEC6818电子相册代码,使用交叉开发原理,使用文件IO接口函数,能够打开文件设备、读写文件设备;来读取BMP图片文件得信息,通过算法实现转换后把数据正确得显示到开发板上去----图片显示程序,可以正确打开触摸屏设备文件,捕捉触摸事件的产生并能判断手指滑动的方向来实现图片的切换----图片切换程序,用数据结构中的双向循环链表来存储图片文件。
时间: 2024-03-05 14:48:07 浏览: 33
很高兴回答您的问题。以下是一个使用交叉开发原理、文件IO接口函数和双向循环链表实现的模块化GEC6818电子相册C语言代码示例:
```c
// 头文件 album.h
#ifndef ALBUM_H
#define ALBUM_H
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/fb.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
typedef struct {
char name[20];
char path[100];
int width;
int height;
unsigned char *data;
} Image;
typedef struct node {
Image *image;
struct node *prev;
struct node *next;
} Node;
typedef struct {
Node *head;
Node *tail;
int count;
} Album;
int openTouchScreen();
int readTouchEvent(int fd, int *x, int *y);
void closeTouchScreen(int fd);
Album createAlbum(int count);
void addImage(Album *album, char *name, char *path);
void showImage(Image *image);
void showAlbum(Album *album, int fbfd);
void destroyAlbum(Album *album);
#endif
// 源文件 album.c
#include "album.h"
#define BMP_HEADER_SIZE 54
#define BMP_WIDTH_OFFSET 18
#define BMP_HEIGHT_OFFSET 22
#define BMP_DATA_OFFSET 54
int openTouchScreen() {
int fd = open("/dev/input/event0", O_RDONLY);
if (fd < 0) {
printf("Failed to open touch screen device\n");
exit(1);
}
return fd;
}
int readTouchEvent(int fd, int *x, int *y) {
struct input_event event;
int n = read(fd, &event, sizeof(event));
if (n < sizeof(event)) {
printf("Failed to read touch event\n");
return -1;
}
if (event.type == EV_ABS && event.code == ABS_X) {
*x = event.value;
} else if (event.type == EV_ABS && event.code == ABS_Y) {
*y = event.value;
} else if (event.type == EV_KEY && event.code == BTN_TOUCH && event.value == 0) {
return 1;
}
return 0;
}
void closeTouchScreen(int fd) {
close(fd);
}
Album createAlbum(int count) {
Album album;
album.head = NULL;
album.tail = NULL;
album.count = 0;
for (int i = 0; i < count; i++) {
Image *image = (Image *) malloc(sizeof(Image));
image->name[0] = '\0';
image->path[0] = '\0';
image->width = 0;
image->height = 0;
image->data = NULL;
Node *node = (Node *) malloc(sizeof(Node));
node->image = image;
node->prev = NULL;
node->next = NULL;
if (album.tail == NULL) {
album.head = node;
album.tail = node;
node->prev = node;
node->next = node;
} else {
album.tail->next = node;
node->prev = album.tail;
node->next = album.head;
album.head->prev = node;
album.tail = node;
}
album.count++;
}
return album;
}
void addImage(Album *album, char *name, char *path) {
for (Node *node = album->head; node != album->tail; node = node->next) {
if (node->image->name[0] == '\0') {
sprintf(node->image->name, "%s", name);
sprintf(node->image->path, "%s", path);
int fd = open(path, O_RDONLY);
if (fd < 0) {
printf("Failed to open image file\n");
exit(1);
}
char header[BMP_HEADER_SIZE];
int n = read(fd, header, BMP_HEADER_SIZE);
if (n < BMP_HEADER_SIZE) {
printf("Failed to read BMP header\n");
exit(1);
}
node->image->width = *(int *) (header + BMP_WIDTH_OFFSET);
node->image->height = *(int *) (header + BMP_HEIGHT_OFFSET);
int size = node->image->width * node->image->height * 3;
node->image->data = (unsigned char *) malloc(size);
n = read(fd, node->image->data, size);
if (n < size) {
printf("Failed to read BMP data\n");
exit(1);
}
close(fd);
break;
}
}
}
void showImage(Image *image, int fbfd) {
struct fb_var_screeninfo vinfo;
ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo);
unsigned char *fbp = (unsigned char *) mmap(NULL, vinfo.yres_virtual * vinfo.xres_virtual * vinfo.bits_per_pixel / 8, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
unsigned char *bmp = image->data;
int bmpWidth = image->width;
int bmpHeight = image->height;
int fbWidth = vinfo.xres;
int fbHeight = vinfo.yres;
int xoffset = (fbWidth - bmpWidth) / 2;
int yoffset = (fbHeight - bmpHeight) / 2;
for (int y = 0; y < bmpHeight; y++) {
for (int x = 0; x < bmpWidth; x++) {
int fbIndex = ((y + yoffset) * fbWidth + (x + xoffset)) * vinfo.bits_per_pixel / 8;
int bmpIndex = (y * bmpWidth + x) * 3;
unsigned char b = bmp[bmpIndex];
unsigned char g = bmp[bmpIndex + 1];
unsigned char r = bmp[bmpIndex + 2];
unsigned int color = ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | ((b & 0xF8) >> 3);
*((unsigned int *) (fbp + fbIndex)) = color;
}
}
munmap(fbp, vinfo.yres_virtual * vinfo.xres_virtual * vinfo.bits_per_pixel / 8);
}
void showAlbum(Album *album, int fbfd) {
int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
int touchfd = openTouchScreen();
Node *node = album->head;
showImage(node->image, fbfd);
while (1) {
int ret = readTouchEvent(touchfd, &x2, &y2);
if (ret == 1) {
int dx = x2 - x1;
int dy = y2 - y1;
if (dx > 0 && abs(dx) > abs(dy)) {
node = node->next;
showImage(node->image, fbfd);
} else if (dx < 0 && abs(dx) > abs(dy)) {
node = node->prev;
showImage(node->image, fbfd);
}
}
x1 = x2;
y1 = y2;
}
closeTouchScreen(touchfd);
}
void destroyAlbum(Album *album) {
for (Node *node = album->head; node != album->tail; node = node->next) {
free(node->image->data);
free(node->image);
free(node);
}
free(album->tail->image->data);
free(album->tail->image);
free(album->tail);
album->head = NULL;
album->tail = NULL;
album->count = 0;
}
// 主程序 main.c
#include "album.h"
int main() {
int fbfd = open("/dev/fb0", O_RDWR);
if (fbfd < 0) {
printf("Failed to open framebuffer device\n");
return 1;
}
Album album = createAlbum(10);
addImage(&album, "Image1", "/path/to/image1.bmp");
addImage(&album, "Image2", "/path/to/image2.bmp");
showAlbum(&album, fbfd);
destroyAlbum(&album);
close(fbfd);
return 0;
}
```
这个示例程序定义了一个`Image`结构体表示图片,以及一个`Node`结构体表示双向循环链表中的节点,以及一个`Album`结构体表示相册,其中`Album`结构体包含头尾指针和节点数量。`createAlbum`函数用于创建相册和节点,`addImage`函数用于向相册中添加图片,并使用文件IO接口函数读取BMP图片文件的信息,`showImage`函数用于将图片数据正确显示到开发板上,`showAlbum`函数用于打开触摸屏设备文件,捕捉触摸事件的产生并判断手指滑动的方向来实现图片的切换。在主程序中,我们创建一个包含10张图片的相册,并向其中添加两张图片,最后使用双向循环链表实现图片文件的存储。需要注意的是,这个示例程序只是一个简单的模块化代码示例,实际开发中需要根据实际需求进行改进和优化。