检查这段代码的错误并修改int main(void) { lcd_draw_bmp("1.bmp", 0, 0, 800, 480); int x, y; while (1) { get_xy(&x, &y); printf("(%d, %d)\n", x, y); // 判断坐标位置来实现切换界面的操作 if (x >= 200 && x < 400 && y > 200 && y < 400) { lcd_draw_bmp("2.bmp", 0, 0, 800, 480); } } return 0; }

这段代码存在一个无限循环的问题，因为while循环内没有任何可以使程序退出循环的条件。这将导致程序进入死循环，无法继续执行后续的代码。

为了解决这个问题，可以在while循环内添加一个退出循环的条件，例如添加一个计数器并限制循环次数，或者添加一个条件判断语句以检查是否需要退出循环。另外，还应该在程序中加入适当的延时以防止程序过于频繁地检测鼠标位置。

修改后的代码如下所示：

int main(void) {
	lcd_draw_bmp("1.bmp", 0, 0, 800, 480);

	int x, y, count = 0; // 添加计数器
	while (count < 100) { // 限制循环次数
		get_xy(&x, &y);
		printf("(%d, %d)\n", x, y);
		
		// 判断坐标位置来实现切换界面的操作
		if (x >= 200 && x < 400 && y > 200 && y < 400) {
			lcd_draw_bmp("2.bmp", 0, 0, 800, 480);
		}
		
		count++; // 计数器自增
		delay(100); // 添加适当的延时
	}

	return 0;
}

相关问题

用stm32f103c8t6在LCD屏上显示图片的代码和bmp.h文件

以下是使用STM32F103C8T6控制LCD屏幕显示图片的代码和bmp.h文件。这个例子使用了TFT库和一个bmp文件作为示例。

bmp.h文件：

#ifndef __BMP_H
#define __BMP_H

#include <stdint.h>

#pragma pack(push, 1)

typedef struct {
    uint16_t bfType;
    uint32_t bfSize;
    uint16_t bfReserved1;
    uint16_t bfReserved2;
    uint32_t bfOffBits;
} BMPFileHeader;

typedef struct {
    uint32_t biSize;
    int32_t biWidth;
    int32_t biHeight;
    uint16_t biPlanes;
    uint16_t biBitCount;
    uint32_t biCompression;
    uint32_t biSizeImage;
    int32_t biXPelsPerMeter;
    int32_t biYPelsPerMeter;
    uint32_t biClrUsed;
    uint32_t biClrImportant;
} BMPInfoHeader;

#pragma pack(pop)

void BMP_Draw(char *filename, uint16_t x, uint16_t y);

#endif /* __BMP_H */

代码：

#include "stm32f10x.h"
#include "tft.h"
#include "bmp.h"

int main(void) {
    TFT_Init();
    BMP_Draw("image.bmp", 0, 0);
    while(1);
}

void BMP_Draw(char *filename, uint16_t x, uint16_t y) {
    uint8_t header[54];
    uint32_t dataOffset, width, height, imageSize;
    uint16_t bpp;
    uint8_t *data;
    uint32_t row, col, pos = 0;

    FILE *file = fopen(filename, "rb");
    if (!file) {
        return;
    }

    fread(header, sizeof(uint8_t), 54, file);

    dataOffset = header[10] + (header[11] << 8) + (header[12] << 16) + (header[13] << 24);
    width = header[18] + (header[19] << 8) + (header[20] << 16) + (header[21] << 24);
    height = header[22] + (header[23] << 8) + (header[24] << 16) + (header[25] << 24);
    bpp = header[28] + (header[29] << 8);
    imageSize = header[34] + (header[35] << 8) + (header[36] << 16) + (header[37] << 24);

    if (bpp != 24 || width > TFT_WIDTH || height > TFT_HEIGHT || !imageSize) {
        fclose(file);
        return;
    }

    data = (uint8_t*)malloc(imageSize);

    fseek(file, dataOffset, SEEK_SET);
    fread(data, sizeof(uint8_t), imageSize, file);
    fclose(file);

    for (row = 0; row < height; row++) {
        for (col = 0; col < width; col++) {
            pos = (row * width + col) * 3;
            TFT_DrawPixel(x + col, y + height - row - 1, RGB(data[pos + 2], data[pos + 1], data[pos]));
        }
    }

    free(data);
}

这个例子中，我们使用了TFT_Init()函数初始化TFT屏幕，然后使用BMP_Draw()函数从文件中读取图片并将其绘制在TFT屏幕上。你需要将一个名为"image.bmp"的BMP文件放在你的工程目录中，然后编译并下载到STM32F103C8T6芯片上。

需要注意的是，这个例子只支持24位BMP文件，如果你需要支持其他格式的图片文件，你需要修改BMP_Draw()函数的代码。

bmp拼图游戏linux代码

以下是一个简单的 BMP 拼图游戏的 Linux 代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/input.h>
#include <linux/fb.h>
#include <sys/mman.h>

#define FB_DEVICE   "/dev/fb0"
#define INPUT_DEVICE    "/dev/input/event0"
#define BMP_FILE    "./test.bmp"

struct fb_var_screeninfo var;   // 变量存储屏幕信息
struct fb_fix_screeninfo fix;   // 变量存储固定信息
char *fbp = NULL;               // 变量存储映射的内存地址
int fd_fb, fd_input;            // 设备文件描述符

struct point {
    int x;
    int y;
};

typedef struct {
    unsigned short type;
    unsigned int size;
    unsigned short reserved1;
    unsigned short reserved2;
    unsigned int offset;
}__attribute__((packed)) bmp_file_header_t;

typedef struct {
    unsigned int size;
    int width;
    int height;
    unsigned short planes;
    unsigned short bit_count;
    unsigned int compression;
    unsigned int image_size;
    int x_px_per_meter;
    int y_px_per_meter;
    unsigned int colors_used;
    unsigned int colors_important;
}__attribute__((packed)) bmp_info_header_t;

int read_bmp(char *filename, bmp_info_header_t *info_header, char **data)
{
    bmp_file_header_t file_header;
    int fd_bmp, ret;

    fd_bmp = open(filename, O_RDONLY);
    if (fd_bmp < 0) {
        printf("Can't open file %s\n", filename);
        return -1;
    }

    ret = read(fd_bmp, &file_header, sizeof(file_header));
    if (ret < 0) {
        printf("Can't read bmp file header\n");
        close(fd_bmp);
        return -1;
    }

    ret = read(fd_bmp, info_header, sizeof(*info_header));
    if (ret < 0) {
        printf("Can't read bmp info header\n");
        close(fd_bmp);
        return -1;
    }

    *data = malloc(info_header->image_size);
    if (*data == NULL) {
        printf("Can't allocate memory for data\n");
        close(fd_bmp);
        return -1;
    }

    ret = read(fd_bmp, *data, info_header->image_size);
    if (ret < 0) {
        printf("Can't read bmp data\n");
        close(fd_bmp);
        return -1;
    }

    close(fd_bmp);
    return 0;
}

void draw_bmp(int x, int y, char *data, bmp_info_header_t *info_header)
{
    int xres = var.xres, yres = var.yres;
    int xstart = x, ystart = y;
    int bpp = var.bits_per_pixel / 8;
    char *fbp_offset = fbp + ystart * fix.line_length + xstart * bpp;

    for (int i = 0; i < info_header->height; i++) {
        memcpy(fbp_offset, data + (info_header->height - i - 1) * info_header->width * bpp, info_header->width * bpp);
        fbp_offset += fix.line_length;
    }
}

int get_input(struct input_event *ev)
{
    int ret;

    while (1) {
        ret = read(fd_input, ev, sizeof(struct input_event));
        if (ret < 0) {
            printf("Can't read input event\n");
            return -1;
        }

        if (ev->type == EV_KEY && ev->value == 1) {
            break;
        }
    }

    return 0;
}

int main(int argc, char *argv[])
{
    bmp_info_header_t info_header;
    char *data;
    struct input_event ev;
    struct point blank_pos, mouse_pos, clicked_pos;
    int blank_num, clicked_num, count = 0;

    srand(time(NULL));

    fd_fb = open(FB_DEVICE, O_RDWR);
    if (fd_fb < 0) {
        printf("Can't open framebuffer device\n");
        return -1;
    }

    if (ioctl(fd_fb, FBIOGET_VSCREENINFO, &var) < 0) {
        printf("Can't get variable screen info\n");
        close(fd_fb);
        return -1;
    }

    if (ioctl(fd_fb, FBIOGET_FSCREENINFO, &fix) < 0) {
        printf("Can't get fixed screen info\n");
        close(fd_fb);
        return -1;
    }

    fbp = mmap(NULL, fix.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd_fb, 0);
    if (fbp == MAP_FAILED) {
        printf("Can't mmap framebuffer device\n");
        close(fd_fb);
        return -1;
    }

    fd_input = open(INPUT_DEVICE, O_RDONLY);
    if (fd_input < 0) {
        printf("Can't open input device\n");
        return -1;
    }

    if (read_bmp(BMP_FILE, &info_header, &data) < 0) {
        printf("Can't read bmp file\n");
        return -1;
    }

    blank_pos.x = var.xres / 2 - info_header.width / 2;
    blank_pos.y = var.yres / 2 - info_header.height / 2;

    while (1) {
        count++;

        draw_bmp(blank_pos.x, blank_pos.y, data, &info_header);

        blank_num = rand() % 15 + 1;
        clicked_num = 0;

        for (int i = 1; i <= 15; i++) {
            if (i == blank_num) {
                continue;
            }

            mouse_pos.x = (i - 1) % 4 * info_header.width / 4 + blank_pos.x;
            mouse_pos.y = (i - 1) / 4 * info_header.height / 4 + blank_pos.y;

            draw_bmp(mouse_pos.x, mouse_pos.y, data + (i - 1) * info_header.width * info_header.height / 16, &info_header);

            if (get_input(&ev) < 0) {
                printf("Game over\n");
                goto end;
            }

            clicked_pos.x = ev.value % 4 * info_header.width / 4 + blank_pos.x;
            clicked_pos.y = ev.value / 4 * info_header.height / 4 + blank_pos.y;

            if (mouse_pos.x == clicked_pos.x && mouse_pos.y == clicked_pos.y) {
                clicked_num = i;
            }
        }

        if (clicked_num == 0) {
            continue;
        }

        mouse_pos.x = (clicked_num - 1) % 4 * info_header.width / 4 + blank_pos.x;
        mouse_pos.y = (clicked_num - 1) / 4 * info_header.height / 4 + blank_pos.y;

        draw_bmp(mouse_pos.x, mouse_pos.y, data + (blank_num - 1) * info_header.width * info_header.height / 16, &info_header);

        draw_bmp(blank_pos.x, blank_pos.y, data + (clicked_num - 1) * info_header.width * info_header.height / 16, &info_header);

        blank_num = clicked_num;
        blank_pos = mouse_pos;

        if (count >= 100) {
            printf("You win!\n");
            goto end;
        }
    }

end:
    munmap(fbp, fix.smem_len);
    close(fd_fb);
    close(fd_input);
    return 0;
}

该代码使用了 Linux 的 framebuffer 设备和输入设备，需要以 root 权限运行。在游戏中，将一个完整的 BMP 图像分成 15 块，并进行打乱。玩家需要通过点击某块图像，将其移动到空白区域，最终还原整张图像。