/// <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")
{
//aspose有性能问题
//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,30);
//换用ghostscript
//GhostscriptRasterizer rasterizer = new GhostscriptRasterizer();
//rasterizer.Open(new MemoryStream(fileBuffer));
//Image page = rasterizer.GetPage(96, 96, 1);
//page.Save(snapStream, ImageFormat.Jpeg);
PDFFile pdfFile = PDFFile.Open(new MemoryStream(fileBuffer));
Bitmap bitmap = pdfFile.GetPageImage(0, 56 * (int)Definition.Two);
bitmap.Save(snapStream, ImageFormat.Jpeg);
}
var result = snapStream.ToArray();
snapStream.Close();
return(result);
}
private static void DocumentToImage()
{
Document doc = new Document(@"C:\test.doc");
var inputFileName = @"C:\test.docx";
Aspose.Cloud.Words.DocumentBuilder builder = new Aspose.Cloud.Words.DocumentBuilder();
builder.insertWatermarkImage(fileName, watermarkImage, rotationAngle);
Aspose.Words.Saving.ImageSaveOptions options = new Aspose.Words.Saving.ImageSaveOptions(Aspose.Words.SaveFormat.Jpeg);
options.PageCount = 1;
for (int pageIndex = 0; pageIndex < doc.PageCount; pageIndex++)
{
string outputFileName = @"C:\" + string.Format("DOCUMENT{0}_{1}.jpeg", "Test", pageIndex + 1);
options.PageIndex = pageIndex;
doc.Save(outputFileName, options);
}
}
/// <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);
}
