public ActionResult GetPdfPageImage(int page)
{
var pdfFilePath = HttpContext.Server.MapPath("~/App_Data/Sample3.PDF");
var pdfToImg = new PdfToImageConverter();
pdfToImg.ScaleTo = 800;
var memStream = new MemoryStream();
pdfToImg.GenerateImage(pdfFilePath, page, ImageFormat.Png, memStream);
return(File(memStream.ToArray(), "image/png"));
}
public async Task <byte[]> getImagePreview(TFile file)
{
try
{
byte[] outPreview = null;
bool topImage = false;
if (file.TipoArchivo.Contains("video"))
{
try {
found:
string nameMD5 = DateTime.Now.Ticks.GetHashCode().ToString("x").ToUpper();
var VideoPath = AppDomain.CurrentDomain.BaseDirectory + @"PreviewFile\Video_" + nameMD5 + "." + file.Nombre.Split('.')[file.Nombre.Split('.').Length - 1];
if (File.Exists(VideoPath))
{
goto found;
}
File.WriteAllBytes(VideoPath, file.ArchivoData);
var imageFile = AppDomain.CurrentDomain.BaseDirectory + @"PreviewFile\VidImage_" + nameMD5 + ".JPG";
var urlFile = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
FFmpeg.SetExecutablesPath(urlFile + @"\MediaToolkit", "ffmpeg");
var infoVideo = await FFmpeg.GetMediaInfo(VideoPath);
var conversion = await FFmpeg.Conversions.FromSnippet.Snapshot(VideoPath, imageFile, infoVideo.Duration / 2.0);
await conversion.Start();
outPreview = File.ReadAllBytes(imageFile);
File.Delete(VideoPath);
File.Delete(imageFile);
}
catch (Exception e) {
outPreview = new byte[0];
}
}
else if (file.TipoArchivo.Contains("pdf"))
{
try
{
again:
string nameMD5 = DateTime.Now.Ticks.GetHashCode().ToString("x").ToUpper();
var pdfFile = AppDomain.CurrentDomain.BaseDirectory + @"PreviewFile\DocPdf_" + nameMD5 + ".pdf";
if (File.Exists(pdfFile))
{
goto again;
}
File.WriteAllBytes(pdfFile, file.ArchivoData);
var imageFile = AppDomain.CurrentDomain.BaseDirectory + @"PreviewFile\DocImg_" + nameMD5 + ".JPG";
var pdfToImg = new PdfToImageConverter();
pdfToImg.ScaleTo = 3000; // fit 200x200 box
pdfToImg.GenerateImage(pdfFile, 1, ImageFormat.Jpeg, imageFile);
outPreview = File.ReadAllBytes(imageFile);
File.Delete(pdfFile);
File.Delete(imageFile);
topImage = true;
}
catch (Exception e)
{
outPreview = new byte[0];
}
}
else
{
outPreview = file.ArchivoData;
}
Stream stream = new MemoryStream(outPreview);
Image imageIn = Image.FromStream(stream);
Bitmap bmPhoto = new Bitmap(imageIn);
// recortar imagen
int sourceWidth = bmPhoto.Width;
int sourceHeight = bmPhoto.Height;
int cuadro = 0;
int x = 0, y = 0;
// double div = (minWidth * 1.0 / minHeight * 1.0);
if (sourceWidth > sourceHeight)
{
cuadro = sourceHeight;
x = sourceWidth / 2 - sourceHeight / 2;
}
else
{
cuadro = sourceWidth;
if (topImage)
{
y = 0;
}
else
{
y = sourceHeight / 2 - sourceWidth / 2;
}
}
Rectangle cropArea = new Rectangle(x, y, cuadro, cuadro);
Bitmap bmpCrop = bmPhoto.Clone(cropArea, bmPhoto.PixelFormat);
//cambiar tamaño
Bitmap bmpRsize = resizeImage(bmpCrop);
// cambiar resolucion
bmpRsize.SetResolution(50, 50);
MemoryStream ms = new MemoryStream();
bmpRsize.Save(ms, imageIn.RawFormat);
return(ms.ToArray());
}
catch (Exception ex)
{
return(new byte[0]);
}
}
