linux6.5安装png

ldconfig -p | grep libpng

#include <stdio.h>
#include <png.h>

int main(int argc, char **argv) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <file.png>
", argv[0]);
        return 1;
    }

    FILE *fp = fopen(argv[1], "rb");
    if (!fp) {
        perror("fopen");
        return 1;
    }

    png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    if (!png) {
        fprintf(stderr, "png_create_read_struct failed
");
        fclose(fp);
        return 1;
    }

    png_infop info = png_create_info_struct(png);
    if (!info) {
        fprintf(stderr, "png_create_info_struct failed
");
        png_destroy_read_struct(&png, NULL, NULL);
        fclose(fp);
        return 1;
    }

    if (setjmp(png_jmpbuf(png))) {
        fprintf(stderr, "Error during init_io
");
        png_destroy_read_struct(&png, &info, NULL);
        fclose(fp);
        return 1;
    }

    png_init_io(png, fp);
    png_read_info(png, info);

    int width = png_get_image_width(png, info);
    int height = png_get_image_height(png, info);
    png_byte color_type = png_get_color_type(png, info);
    png_byte bit_depth = png_get_bit_depth(png, info);

    printf("Width: %d, Height: %d, Color Type: %d, Bit Depth: %d
",
           width, height, color_type, bit_depth);

    png_destroy_read_struct(&png, &info, NULL);
    fclose(fp);

    return 0;
}

gcc -o read_png read_png.c -lpng
./read_png example.png