Word控件Spire.Doc 转换教程(十八)： 将 RTF 转换为图像并重置图像分辨率

下载并安装 Spire.Doc for .NET，然后通过以下路径在下载的 Bin 文件夹中添加 Spire.Doc.dll 作为参考：“..Spire.DocBinNET4.0 Spire.Doc.dll”。下面详细介绍如何在 C# 中将 RTF 转换为 PNG 和重置图像分辨率。

第 1 步：创建一个新文档并从文件加载。

Document doc = new Document();doc.LoadFromFile("sample.rtf", FileFormat.Rtf);

第 2 步：将 RTF 保存到图像。

Image[] images = doc.SaveToImages(Spire.Doc.Documents.ImageType.Metafile);

第 3 步：遍历图片列表中的元素，保存为.Png格式。

for (int i = 0; i < images.Length; i++){Metafile mf = images[i] as Metafile;Image newimage = ResetResolution(mf, 200);string outputfile = String.Format("image-{0}.png", i);newimage.Save(outputfile, System.Drawing.Imaging.ImageFormat.Png);}

第 4 步：设置图像分辨率调用方法：ResetResolution。

public static Image ResetResolution(Metafile mf, float resolution){int width = (int)(mf.Width * resolution / mf.HorizontalResolution);int height = (int)(mf.Height * resolution / mf.VerticalResolution);Bitmap bmp = new Bitmap(width, height);bmp.SetResolution(resolution, resolution);using (Graphics g = Graphics.FromImage(bmp)){g.DrawImage(mf, Point.Empty);}return bmp;}

重置图片分辨率前图片的有效截图：

重置图像分辨率后的图像：

完整代码：

using Spire.Doc;using System.Drawing;using System.Drawing.Imaging;namespace RTFtoImage{class Program{static void Main(string[] args){//Create a new document and load from file.Document doc = new Document();doc.LoadFromFile("sample.rtf", FileFormat.Rtf);// save the RTF to imageImage[] images = doc.SaveToImages(Spire.Doc.Documents.ImageType.Metafile);for (int i = 0; i < images.Length; i++){Metafile mf = images[i] as Metafile;Image newimage = ResetResolution(mf, 200);string outputfile = String.Format("image-{0}.png", i);newimage.Save(outputfile, System.Drawing.Imaging.ImageFormat.Png);}}//set the image resolution by the ResetResolution() methodpublic static Image ResetResolution(Metafile mf, float resolution){int width = (int)(mf.Width * resolution / mf.HorizontalResolution);int height = (int)(mf.Height * resolution / mf.VerticalResolution);Bitmap bmp = new Bitmap(width, height);bmp.SetResolution(resolution, resolution);using (Graphics g = Graphics.FromImage(bmp)){g.DrawImage(mf, Point.Empty);}return bmp;}}}

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