public static string PDFToBMP(string pdfFilePath, string bmpFilePath)
{
var stream = new FileStream(pdfFilePath, FileMode.Open);
var pdfConvert = new Aspose.Pdf.Facades.PdfConverter();
var pdfDoc = new Aspose.Pdf.Document(stream);
pdfConvert.BindPdf(pdfDoc);
pdfConvert.DoConvert();
pdfConvert.GetNextImage(bmpFilePath, new Aspose.Pdf.PageSize(200, 150), System.Drawing.Imaging.ImageFormat.Bmp);
pdfConvert.Close();
pdfConvert.Dispose();
stream.Flush();
stream.Close();
return(bmpFilePath);
}
public MemoryStream ConvertPDFToImage(string filepath, int page)
{
var converter = new Aspose.Pdf.Facades.PdfConverter();
converter.BindPdf(filepath);
converter.StartPage = page;
converter.EndPage = page;
converter.Resolution = new Aspose.Pdf.Devices.Resolution(300);
converter.DoConvert();
MemoryStream imageStream = new MemoryStream();
while (converter.HasNextImage())
{
converter.GetNextImage(imageStream, System.Drawing.Imaging.ImageFormat.Png);
imageStream.Position = 0;
}
return(imageStream);
}
/// <summary>
/// 生成缩略图，只生成第一张页面的缩略图
/// </summary>
/// <param name="fileBuffer">文件的字节数组</param>
/// <param name="fileType">文件类型，目前支持：Word、Excel、PDF</param>
public static byte[] ConvertToSnap(byte[] fileBuffer, string fileType)
{
var snapStream = new MemoryStream();
if (fileType == "xls" || fileType == "xlsx")
{
var book = new Aspose.Cells.Workbook(new MemoryStream(fileBuffer));
var sheet = book.Worksheets[0];
var imgOptions = new Aspose.Cells.Rendering.ImageOrPrintOptions
{
OnePagePerSheet = true,
VerticalResolution = 400,
HorizontalResolution = 300,
ImageFormat = System.Drawing.Imaging.ImageFormat.Jpeg
};
var sr = new Aspose.Cells.Rendering.SheetRender(sheet, imgOptions);
sr.ToImage(0, snapStream);
}
else if (fileType == "doc" || fileType == "docx")
{
var doc = new Aspose.Words.Document(new MemoryStream(fileBuffer));
var imgOptions = new Aspose.Words.Saving.ImageSaveOptions(Aspose.Words.SaveFormat.Jpeg)
{
Resolution = 400,
};
doc.Save(snapStream, imgOptions);
}
else if (fileType == "pdf")
{
var converter = new Aspose.Pdf.Facades.PdfConverter();
converter.BindPdf(new Aspose.Pdf.Document(new MemoryStream(fileBuffer)));
converter.DoConvert();
converter.GetNextImage(snapStream, new Aspose.Pdf.PageSize(200, 150), System.Drawing.Imaging.ImageFormat.Jpeg);
}
var result = snapStream.ToArray();
snapStream.Close();
return(result);
}