ImageMagick 以数据流的方式保存图片

/* 图片路径 */
const char file_path[] = "D:/studyplace/workplace/cpp/resource/9.jpg";

const char result_path[] = "D:/studyplace/workplace/cpp/resource/tmp.jpg";
/* 普通图片旋转 数据流保存方式 */
int magick_rotate_stream()
{
    int rc = 0;
    PixelWand* background_color = NULL;
    MagickWand* magick_wand = NULL;
    size_t data_size = 0;
    unsigned char* image_data = NULL;
    FILE* file = NULL;
    size_t bytes_written = 0;

    // 初始化ImageMagick库
    MagickWandGenesis();

    // 创建MagickWand对象
    magick_wand = NewMagickWand();

    // 读取图片文件
    if (MagickReadImage(magick_wand, file_path) == MagickFalse) {
        printf("Failed to read image\n");
        rc = -1;
        goto l_out;
    }

    background_color = NewPixelWand();
    PixelSetColor(background_color, "#FF0"); // 这里可以设置为你想要的颜色，比如"#FFF"表示白色

    // 旋转图片（顺时针90度）
    if (MagickRotateImage(magick_wand, background_color, 90) == MagickFalse) {
        printf("Failed to rotate image\n");
        rc = -1;
        goto l_e_free;
    }

    image_data = (unsigned char*)MagickGetImageBlob(magick_wand, &data_size);

    // 打开文件以写入数据
    file = fopen("D:/studyplace/workplace/cpp/resource/output.png", "wb"); // 使用二进制模式写入文件
    if (file == NULL) {
        printf("无法打开文件。\n");
        rc = -1;
        goto l_e_free;
    }

    // 将数据流写入文件
    bytes_written = fwrite(image_data, sizeof(unsigned char), data_size, file);
    if (bytes_written != data_size) {
        printf("写入文件时出现错误。\n");      
        rc = -1;
        goto l_e_free_file;
    }

    // 关闭文件
    fclose(file);
    background_color = DestroyPixelWand(background_color);
    magick_wand = DestroyMagickWand(magick_wand);

l_out:
    MagickWandTerminus();
    return rc;

l_e_free_file:
    fclose(file);

l_e_free:
    background_color = DestroyPixelWand(background_color);
    magick_wand = DestroyMagickWand(magick_wand);
    goto l_out;
}
int main() {
    magick_rotate_stream();
    return 0;
}