public async void SpireChange(string url) { //url = "https://openapi.bestsign.info/openapi/v2/storage/contract/download/?developerId=1552635811012161536&rtick=15879806269530&signType=rsa&sign=QIAwfvzYdj2VyEZiPQq10TkDhxxwnBPZQzuvfjSeER9qNcuff6fp6zI34UrnRyM8FQURyRaEt98H37Ntnccdv12SZ0KN1CRu1w3%2F0EODcZVfUMFucotHOGgoAagBHrZQS6Zc9rvDWaNazYQFRW8hYS3XnmDaQkCqSJ%2FOt%2BRqcNVX8hvyZkYqSuU6GDz7JbtdKV%2B2glUfGJyeNPQcLuzTFTqrLGwOIwRrela6f0CafNkwfpOURvkiTUgf0Hd4Gt5OXw22%2FL2EDYvEaXlIjyastkGc2WXLcNGMnTAk7HTKfULcmEFyBzVKYeuvhAt6pCDW01M7kQQPXi%2Fi6KA5KhZ%2F%2Bw%3D%3D&contractId=158797930501000001"; url = "https://openapi.bestsign.info/openapi/v2/storage/contract/download/?developerId=1552635811012161536&rtick=15895128046650&signType=rsa&sign=Gh6GoWVXqfB%2FvGSn1TcXKfr%2Fjl4TdaQggmDSLfDHaUoduJXvns1r7ZlVFi9Q2HVtipuSiqYl0DnfTSoRDdd42LQOgB9BL56N9UJXB0D8tK4u3CZd7xtNCi%2Fwr%2BeyXi%2FvaiupJeIZnaXGL1rfsE%2BowLGJyFmbBhnpWMZze9v2Q3rXm49YvXrVZam0yYXU56v3UfLAwZh1zwGj5mVbLgW1UMAqfLRJnP%2FJVfRJZQrJ7Zl1uQxgZGRQjjilghbijTkA3Z3%2Fy9I1fV4JCW7QPbciBFyrg7wXFSAnKnuqGPbBRXsQpxdEdYYRAyw4H%2Be3kOE1ccOoROpxH%2Bc7qEiJRdVgkA%3D%3D&contractId=158797930501000001"; //加载文档 Spire.Pdf.PdfDocument doc = new Spire.Pdf.PdfDocument(); byte[] buffer = await GetStream(url); doc.LoadFromBytes(buffer); StringBuilder str = new StringBuilder(); List <Image> ListImage = new List <Image>(); foreach (PdfPageBase page in doc.Pages) { // 获取所有pages里面的图片 Image[] images = page.ExtractImages(); if (images != null && images.Length > 0) { ListImage.AddRange(images); } str.Append(page.ExtractText().Replace("Evaluation Warning : The document was created with Spire.PDF for .NET.", "")); /*PdfTextFind[] result = page.FindText("使用人确认签字", TextFindParameter.None).Finds; * foreach (PdfTextFind text in result) * { * //获取文字的坐标,宽度和高度 * PointF pf = text.Position; * SizeF size = text.Size; * pf.X = pf.X; * pf.Y = pf.Y; * str.Append(pf + " size:" + size + Environment.NewLine); * }*/ } // 将提取到的图片保存到本地路径 //if (ListImage.Count > 0) { for (int i = 0; i < ListImage.Count; i++) { Image image = ListImage[i]; image.Save("image" + (i + 1).ToString() + ".png", System.Drawing.Imaging.ImageFormat.Png); } } doc.SaveToFile("PDF.html", FileFormat.HTML); doc.SaveToFile("下载.pdf", FileFormat.PDF); this.richTextBox1.Text = str.ToString(); }