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C# 添加、删除PPT水印

2018-10-30 16:34 本站整理 浏览(4)

【前言】

水印是一种有效的文档防伪手段,在工作中非常实用。在接下来的示例中,将介绍如何通过C#编程语言来实现Power Point幻灯片添加水印。我们知道,水印可以分为文本水印、图片水印,在此也将分别介绍实现两种水印效果的具体方法。另外,水印幻灯片中已经存在的水印,如果我们想要去除水印效果,也可以参考下面的关于删除水印的方法。

【工具】

 

代码示例

【示例1】添加PPT文本水印

using System;
using System.Text;
using Spire.Presentation;
using System.Drawing;
using Spire.Presentation.Drawing;
using System.Windows.Forms;

namespace InsertWatermark_PPT
{
    class Program
    {
        static void Main(string[] args)
        {
            //初始化一个Presentation类实例并加载文档
            Presentation ppt = new Presentation();
            ppt.LoadFromFile("test.pptx", FileFormat.Pptx2010);

            //初始化一个Font类字体实例并实例化字体格式
            Font stringFont = new Font("Arial", 90);
            Size size = TextRenderer.MeasureText("内部资料", stringFont);

            //绘制一个Shape并指定大小、填充颜色、边框颜色和旋转度
            RectangleF rect = new RectangleF((ppt.SlideSize.Size.Width - size.Width) / 2, (ppt.SlideSize.Size.Height - size.Height) / 2, size.Width, size.Height);
            IAutoShape shape = ppt.Slides[0].Shapes.AppendShape(Spire.Presentation.ShapeType.Rectangle, rect);
            shape.Fill.FillType = FillFormatType.None;
            shape.ShapeStyle.LineColor.Color = Color.White;
            shape.Rotation = -45;

            //设定形状保护属性、填充模式
            shape.Locking.SelectionProtection = true;
            shape.Line.FillType = FillFormatType.None;

            //设置文本水印文字,并设置水印填充模式、水印颜色、大小等
            shape.TextFrame.Text = "内部资料";
            TextRange textRange = shape.TextFrame.TextRange;
            textRange.Fill.FillType = Spire.Presentation.Drawing.FillFormatType.Solid;
            textRange.Fill.SolidColor.Color = Color.FromArgb(150, Color.LightBlue);
            textRange.FontHeight = 90;

            //保存并打开文档
            ppt.SaveToFile("TextWatermark.pptx", FileFormat.Pptx2010);
            System.Diagnostics.Process.Start("TextWatermark.pptx");
        }
    }
}

 

文本水印添加效果:


 

【示例2】添加图片水印

using System;
using System.Drawing;
using Spire.Presentation;
using Spire.Presentation.Drawing;

namespace ImageWatermark_PPT
{
    class Program
    {
        static void Main(string[] args)
        {
            //初始化一个Presentation类实例并加载文档
            Presentation ppt = new Presentation();
            ppt.LoadFromFile("test.pptx", FileFormat.Pptx2010);

            //为第一张幻灯片设置背景图片类型和样式
            ppt.Slides[0].SlideBackground.Type = Spire.Presentation.Drawing.BackgroundType.Custom;
            ppt.Slides[0].SlideBackground.Fill.FillType = FillFormatType.Picture;
            ppt.Slides[0].SlideBackground.Fill.PictureFill.FillType = PictureFillType.Stretch;

            //加载图片并为第一张幻灯片设置水印效果
            Image img = Image.FromFile("1.jpg");
            IImageData image = ppt.Images.Append(img);
            ppt.Slides[0].SlideBackground.Fill.PictureFill.Picture.EmbedImage = image;

            //保存并打开文档
            ppt.SaveToFile("ImageWatermark.pptx", FileFormat.Pptx2010);
            System.Diagnostics.Process.Start("ImageWatermark.pptx");
        }
    }
}

 

 图片水印添加效果:

 


 

【示例3】删除文本水印效果

using Spire.Presentation;

namespace DeleteTextWatermark_PPT
{
    class Program
    {
        static void Main(string[] args)
        {
            //实例化Presentation类,加载有水印的PowerPoint文档
            Presentation ppt = new Presentation();
            ppt.LoadFromFile("TextWatermark.pptx");

            //遍历每一张幻灯片, 查找水印文字内容所在的形状并删除
            for (int i = 0; i < ppt.Slides.Count; i++)
            {
                for (int j = 0; j < ppt.Slides[i].Shapes.Count; j++)
                {
                    if (ppt.Slides[i].Shapes[j] is IAutoShape)
                    {
                        IAutoShape shape = ppt.Slides[i].Shapes[j] as IAutoShape;
                        if (shape.TextFrame.Text.Contains("内部资料"))
                        {
                            ppt.Slides[i].Shapes.Remove(shape);
                        }
                    }
                }
            }

            //保存并打开文档
            ppt.SaveToFile("RemoveTextWatermak.pptx", FileFormat.Pptx2010);
            System.Diagnostics.Process.Start("RemoveTextWatermak.pptx");
        }
    }
}

 

文本删除效果:

 

【示例4】删除图片水印效果

using Spire.Presentation;
using Spire.Presentation.Drawing;

namespace DeleteImageWatermark_PPT
{
    class Program
    {
        static void Main(string[] args)
        {
            //实例化Presentation类,加载有图片水印的PowerPoint文档
            Presentation ppt = new Presentation();
            ppt.LoadFromFile("ImageWatermark.pptx");

            //遍历每一张幻灯片, 设置背景填充类型为None
            for (int i = 0; i < ppt.Slides.Count; i++)
            {
                ppt.Slides[0].SlideBackground.Fill.FillType = FillFormatType.None;
            }

            //保存结果文档到本地并打开
            ppt.SaveToFile("RemovePicWatermak.pptx", FileFormat.Pptx2010);
            System.Diagnostics.Process.Start("RemovePicWatermak.pptx");
        }
    }
}

 

图片删除效果:

 


 

(本文完)