wkhtmltopdf 与 .Net Core

news2024/10/6 10:35:16

wkhtmltopdf 是使用webkit引擎转化为pdf的开源小插件.
其有.NET CORE版本的组件,DinkToPdf,但该控件对跨平台支持有限。
故打算在Linux上安装相关插件直接调用.

准备工作

虚拟机：Linux version 3.10.0-1160.el7.x86_64
wkhtmltox开发包：wkhtmltox_0.12.6.1-2.bullseye_amd64.deb
运行环境：mcr.microsoft.com/dotnet/aspnet:6.0

Dockerfile

# 微软Debian 11 镜像
FROM mcr.microsoft.com/dotnet/sdk:6.0
WORKDIR /app
# 设置清华源
RUN sed -i 's/deb.debian.org/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list
RUN sed -i 's/security.debian.org/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list
# 安装依赖项
RUN apt-get update && apt-get install -y \
    fontconfig \
    libfreetype6 \
    libjpeg62-turbo \
    libpng16-16 \
    libx11-6 \
    libxcb1 \
    libxext6 \
    libxrender1 \
    xfonts-75dpi \
    xfonts-base

# 安装wkhtmltox
COPY wkhtmltox_0.12.6.1-2.bullseye_amd64.deb .
RUN dpkg -i wkhtmltox_0.12.6.1-2.bullseye_amd64.deb


# 设置环境变量
ENV LD_LIBRARY_PATH=/usr/local/lib:/usr/lib:/usr/local/lib64:/usr/lib64

CMD ["/bin/bash"]

生成测试类

using System.Runtime.InteropServices;

public class Program
{
    // 声明CAPI函数
    [DllImport("libwkhtmltox.so", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
    public static extern int wkhtmltopdf_init(int use_graphics);

    [DllImport("libwkhtmltox.so", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
    public static extern IntPtr wkhtmltopdf_create_global_settings();

    [DllImport("libwkhtmltox.so", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
    public static extern IntPtr wkhtmltopdf_create_object_settings();

    [DllImport("libwkhtmltox.so", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
    public static extern void wkhtmltopdf_set_global_setting(IntPtr settings, string name, string value);

    [DllImport("libwkhtmltox.so", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
    public static extern void wkhtmltopdf_set_object_setting(IntPtr settings, string name, string value);

    [DllImport("libwkhtmltox.so", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
    public static extern IntPtr wkhtmltopdf_create_converter(IntPtr settings);

    [DllImport("libwkhtmltox.so", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
    public static extern void wkhtmltopdf_add_object(IntPtr converter, IntPtr objectSettings, byte[] data);

    [DllImport("libwkhtmltox.so", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
    public static extern int wkhtmltopdf_convert(IntPtr converter);

    [DllImport("libwkhtmltox.so", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
    public static extern void wkhtmltopdf_destroy_converter(IntPtr converter);

    [DllImport("libwkhtmltox.so", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
    public static extern void wkhtmltopdf_deinit();

    public static void Main(string[] args)
    {

        Console.WriteLine("123");
        try
        {
            // 初始化wkhtmltopdf库
            wkhtmltopdf_init(0);

            // 创建全局设置和对象设置
            IntPtr gs = wkhtmltopdf_create_global_settings();
            IntPtr os = wkhtmltopdf_create_object_settings();

            // 设置全局设置和对象设置
            wkhtmltopdf_set_global_setting(gs, "out", "output.pdf");
            wkhtmltopdf_set_object_setting(os, "page", "1.html");

            // 创建转换器
            IntPtr converter = wkhtmltopdf_create_converter(gs);

            // 添加要转换的对象
            wkhtmltopdf_add_object(converter, os, null);

            // 执行转换
            wkhtmltopdf_convert(converter);


            // 清理资源
            wkhtmltopdf_destroy_converter(converter);
            wkhtmltopdf_deinit();
        }catch(Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
       
    }
}