Develop Reference

Convert PDF to TIFF using ImageMagick & C#

I have an existing program that does some processing a .pdf file and splitting it into multiple .pdf files based on looking for barcodes on the pages.
The program uses ImageMagick and C#.
I want to change it from outputting pdfs to outputting tifs. Look for the comment in the code below for where I would guess the change would be made.
I included the ImageMagick tag because someone might offer a commandline option that someone else can help me convert to C#.
private void BurstPdf(string bigPdfName, string targetfolder)
{
bool outputPdf = true; // change to false to output tif.
string outputExtension = "";
var settings = new MagickReadSettings { Density = new Density(200) };
string barcodePng = Path.Combine("C:\TEMP", "tmp.png");
using (MagickImageCollection pdfPageCollection = new MagickImageCollection())
{
pdfPageCollection.Read(bigPdfName, settings);
int inputPageCount = 0;
int outputPageCount = 0;
int outputFileCount = 0;
MagickImageCollection resultCollection = new MagickImageCollection();
string barcode = "";
string resultName = "";
IBarcodeReader reader = new BarcodeReader();
reader.Options.PossibleFormats = new List<BarcodeFormat>();
reader.Options.PossibleFormats.Add(BarcodeFormat.CODE_39);
reader.Options.TryHarder = false;
foreach (MagickImage pdfPage in pdfPageCollection)
{
MagickGeometry barcodeArea = getBarCodeArea(pdfPage);
IMagickImage barcodeImg = pdfPage.Clone();
barcodeImg.ColorType = ColorType.Bilevel;
barcodeImg.Depth = 1;
barcodeImg.Alpha(AlphaOption.Off);
barcodeImg.Crop(barcodeArea);
barcodeImg.Write(barcodePng);
inputPageCount++;
using (var barcodeBitmap = new Bitmap(barcodePng))
{
var result = reader.Decode(barcodeBitmap);
if (result != null)
{
// found a first page because it has bar code.
if (result.BarcodeFormat.ToString() == "CODE_39")
{
if (outputFileCount != 0)
{
// write out previous pages.
if (outputPdf) {
outputExtension = ".pdf";
} else {
// What do I put here to output a g4 compressed tif?
outputExtension = ".tif";
}
resultName = string.Format("{0:D4}", outputFileCount) + "-" + outputPageCount.ToString() + "-" + barcode + outputExtension;
resultCollection.Write(Path.Combine(targetfolder, resultName));
resultCollection = new MagickImageCollection();
}
barcode = standardizePhysicalBarCode(result.Text);
outputFileCount++;
resultCollection.Add(pdfPage);
outputPageCount = 1;
}
else
{
Console.WriteLine("WARNING barcode is not of type CODE_39 so something is wrong. check page " + inputPageCount + " of " + bigPdfName);
if (inputPageCount == 1)
{
throw new Exception("barcode not found on page 1. see " + barcodePng);
}
resultCollection.Add(pdfPage);
outputPageCount++;
}
}
else
{
if (inputPageCount == 1)
{
throw new Exception("barcode not found on page 1. see " + barcodePng);
}
resultCollection.Add(pdfPage);
outputPageCount++;
}
}
if (File.Exists(barcodePng))
{
File.Delete(barcodePng);
}
}
if (resultCollection.Count > 0)
{
if (outputPdf) {
outputExtension = ".pdf";
} else {
// What do I put here to output a g4 compressed tif?
outputExtension = ".tif";
}
resultName = string.Format("{0:D4}", outputFileCount) + "-" + outputPageCount.ToString() + "-" + barcode + outputExtension;
resultCollection.Write(Path.Combine(targetfolder, resultName));
outputFileCount++;
}
}
}
[EDIT] The above code is what I am using (which some untested modifications) to split a .pdf into other .pdfs. I want to know how to modify this code to output tiffs. I put a comment in the code where I think the change would go.
[EDIT] So encouraged by #fmw42 I just ran the code with the .tif extension enabled. Looks like it did convert to a .tif, but the tif is not compressed. I am surprised that IM just configures the output based on the extension name of the file. Handy I guess, but just seems a little loose.
[EDIT] I figured it out. Although counter-intuitive ones sets the compression on the read of the file. I am reading a .pdf but I set the compression to Group for like this:
var settings = new MagickReadSettings { Density = new Density(200), Compression = CompressionMethod.Group4 };
The thing I learned was that simply naming the output file .tif tells IM to output a tif. That is a handy way to do it, but it just seems sloppy.

Asp.Net Mvc Delete file issue

I have an issue with Files.
I am doing an image importer so clients put their files on an FTP server and then they can import it in the application.
During the import process I copy the file in the FTP Folder to another folder with File.copy
public List<Visuel> ImportVisuel(int galerieId, string[] images)
{
Galerie targetGalerie = MemoryCache.GetGaleriById(galerieId);
List<FormatImage> listeFormats = MemoryCache.FormatImageToList();
int i = 0;
List<Visuel> visuelAddList = new List<Visuel>();
List<Visuel> visuelUpdateList = new List<Visuel>();
List<Visuel> returnList = new List<Visuel>();
foreach (string item in images)
{
i++;
Progress.ImportProgress[Progress.Guid] = "Image " + i + " sur " + images.Count() + " importées";
string extension = Path.GetExtension(item);
string fileName = Path.GetFileName(item);
string originalPath = HttpContext.Current.Request.PhysicalApplicationPath + "Uploads\\";
string destinationPath = HttpContext.Current.Server.MapPath("~/Images/Catalogue") + "\\";
Visuel importImage = MemoryCache.GetVisuelByFilName(fileName);
bool update = true;
if (importImage == null) { importImage = new Visuel(); update = false; }
Size imageSize = importImage.GetJpegImageSize(originalPath + fileName);
FormatImage format = listeFormats.Where(f => f.width == imageSize.Width && f.height == imageSize.Height).FirstOrDefault();
string saveFileName = Guid.NewGuid() + extension;
File.Copy(originalPath + fileName, destinationPath + saveFileName);
if (format != null)
{
importImage.format = format;
switch (format.key)
{
case "Catalogue":
importImage.fileName = saveFileName;
importImage.originalFileName = fileName;
importImage.dossier = targetGalerie;
importImage.dossier_id = targetGalerie.id;
importImage.filePath = "Images/Catalogue/";
importImage.largeur = imageSize.Width;
importImage.hauteur = imageSize.Height;
importImage.isRoot = true;
if (update == false) { MemoryCache.Add(ref importImage); returnList.Add(importImage); }
if (update == true) visuelUpdateList.Add(importImage);
foreach (FormatImage f in listeFormats)
{
if (f.key.StartsWith("Catalogue_"))
{
string[] keys = f.key.Split('_');
string destinationFileName = saveFileName.Insert(saveFileName.IndexOf('.'), "-" + keys[1].ToString());
string destinationFileNameDeclinaison = destinationPath + destinationFileName;
VisuelResizer declinaison = new VisuelResizer();
declinaison.Save(originalPath + fileName, f.width, f.height, 1000, destinationFileNameDeclinaison);
Visuel visuel = MemoryCache.GetVisuelByFilName(fileName.Insert(fileName.IndexOf('.'), "-" + keys[1].ToString()));
update = true;
if (visuel == null) { visuel = new Visuel(); update = false; }
visuel.parent = importImage;
visuel.filePath = "Images/Catalogue/";
visuel.fileName = destinationFileName;
visuel.originalFileName = string.Empty;
visuel.format = f;
//visuel.dossier = targetGalerie; On s'en fout pour les déclinaisons
visuel.largeur = f.width;
visuel.hauteur = f.height;
if (update == false)
{
visuelAddList.Add(visuel);
}
else
{
visuelUpdateList.Add(visuel);
}
//importImage.declinaisons.Add(visuel);
}
}
break;
}
}
}
MemoryCache.Add(ref visuelAddList);
// FONCTION à implémenter
MemoryCache.Update(ref visuelUpdateList);
return returnList;
}
After some processes on the copy (the original file is no more used)
the client have a pop-up asking him if he wants to delete the original files in the ftp folder.
If he clicks on Ok another method is called on the same controller
and this method use
public void DeleteImageFile(string[] files)
{
for (int i = 0; i < files.Length; i++)
{
File.Delete(HttpContext.Current.Request.PhysicalApplicationPath + files[i].Replace(#"/", #"\"));
}
}
This method works fine and really delete the good files when I use it in other context.
But here I have an error message:
Process can't acces to file ... because it's used by another process.
Someone have an idea?
Thank you.
Here's the screenshot of Process Explorer

There are couple of thing you can do here.
1) If you can repro it, you can use Process Explorer at that moment and see which process is locking the file and if the process is ur process then making sure that you close the file handle after your work is done.
2) Use try/catch around the delete statement and retry after few seconds to see if the file handle was released.
3) If you can do it offline you can put in some queue and do the deletion on it later on.

You solve this by using c# locks. Just embed your code inside a lock statement and your threads will be safe and wait each other to complete processing.

I found the solution:
in my import method, there a call to that method
public void Save(string originalFile, int maxWidth, int maxHeight, int quality, string filePath)
{
Bitmap image = new Bitmap(originalFile);
Save(ref image, maxWidth, maxHeight, quality, filePath);
}
The bitmap maintains the file opened blocking delete.
just added
image.Dispose();
in the methos and it work fine.
Thank you for your help, and thank you for process explorer. Very useful tool

Directory.GetFiles or DirectoryInfo.GetFiles returns empty list

I've got some strange behavior during execution in a ASP.NET application.
It doesn't matter if I set workingFolder (see code below) to System.IO.Path.GetTempPath or any other public folder (current case).
I receive a ZIP file, unpack that file (using SharpZipLib) and try to digest the files in that folder, but the System.IO GetFiles returns an empty list.
I've tried to use DirectoryInfo.GetFiles and Directory.GetFiles : both an empty list.
If I breakpoint on the Directory.Delete and look at the folder I can see the files, they're not locked and I can do anything with the files - even if I set the "run from cursor" point at the beginning of the foreach no luck - the GetFiles still return an empty list (although I can see the files in explorer).
private const string EXTENSION_LOG_FILE = ".txt";
private const string VALID_EXTENSION_MASK = "*." + EXTENSION_LOG_FILE;
var zipFolder = unpackZip(filePath, workingFolder);
foreach (var zipFileInfo in new DirectoryInfo(zipFolder).GetFiles(VALID_EXTENSION_MASK, SearchOption.TopDirectoryOnly))
{
// never get's here
value.AddRange(getLogItems(zipFileInfo.FullName));
File.Delete(zipFileInfo.FullName);
}
// this fails: folder is not empty
Directory.Delete(zipFolder);
and the unpackZip method:
private static string unpackZip(string zipFile, string workingFolder)
{
// doesn't matter what name I use, GUID or no GUID the GetFiles still returns an empty lists
var tempFolder = Path.Combine(workingFolder, Guid.NewGuid().ToString());
Directory.CreateDirectory(tempFolder);
using (var unzipStream = new ZipInputStream(File.OpenRead(zipFile)))
{
ZipEntry entry;
while ((entry = unzipStream.GetNextEntry()) != null)
{
var fileName = Path.GetFileName(entry.Name);
if (fileName == string.Empty) continue;
using (var streamWriter = File.Create(Path.Combine(tempFolder, Path.GetFileName(entry.Name))))
{
var size = 2048;
var data = new byte[2048];
while (size > 0)
{
size = unzipStream.Read(data, 0, data.Length);
streamWriter.Write(data, 0, size);
}
}
}
}
return tempFolder;
}
any suggestions?

Problem which I guessed in
private const string VALID_EXTENSION_MASK = "*." + EXTENSION_LOG_FILE;
retruns *..txt because EXTENSION_LOG_FILE = ".txt"

Image uploading in images folder issue in Asp.net

I am trying to upload JPG file to a folder I have created in my project.
The image does not get saved in the images folder. It displays my image when I upload but the image itself is not present in images folder.
Here is the code i am using:
private void btnUpload_Click(object sender, System.EventArgs e)
{
// Initialize variables
string sSavePath;
string sThumbExtension;
int intThumbWidth;
int intThumbHeight;
// Set constant values
sSavePath = "images/";
sThumbExtension = "_thumb";
intThumbWidth = 160;
intThumbHeight = 120;
// If file field isn’t empty
if (filUpload.PostedFile != null)
{
// Check file size (mustn’t be 0)
HttpPostedFile myFile = filUpload.PostedFile;
int nFileLen = myFile.ContentLength;
if (nFileLen == 0)
{
lblOutput.Text = "No file was uploaded.";
return;
}
// Check file extension (must be JPG)
if (System.IO.Path.GetExtension(myFile.FileName).ToLower() != ".jpg")
{
lblOutput.Text = "The file must have an extension of JPG";
return;
}
// Read file into a data stream
byte[] myData = new Byte[nFileLen];
myFile.InputStream.Read(myData,0,nFileLen);
// Make sure a duplicate file doesn’t exist. If it does, keep on appending an
// incremental numeric until it is unique
string sFilename = System.IO.Path.GetFileName(myFile.FileName);
int file_append = 0;
while (System.IO.File.Exists(Server.MapPath(sSavePath + sFilename)))
{
file_append++;
sFilename = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName)
+ file_append.ToString() + ".jpg";
}
// Save the stream to disk
System.IO.FileStream newFile
= new System.IO.FileStream(Server.MapPath(sSavePath + sFilename),
System.IO.FileMode.Create);
newFile.Write(myData,0, myData.Length);
newFile.Close();
// Check whether the file is really a JPEG by opening it
System.Drawing.Image.GetThumbnailImageAbort myCallBack =
new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
Bitmap myBitmap;
try
{
myBitmap = new Bitmap(Server.MapPath(sSavePath + sFilename));
// If jpg file is a jpeg, create a thumbnail filename that is unique.
file_append = 0;
string sThumbFile = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName)
+ sThumbExtension + ".jpg";
while (System.IO.File.Exists(Server.MapPath(sSavePath + sThumbFile)))
{
file_append++;
sThumbFile = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) +
file_append.ToString() + sThumbExtension + ".jpg";
}
// Save thumbnail and output it onto the webpage
System.Drawing.Image myThumbnail
= myBitmap.GetThumbnailImage(intThumbWidth,
intThumbHeight, myCallBack, IntPtr.Zero);
myThumbnail.Save (Server.MapPath(sSavePath + sThumbFile));
imgPicture.ImageUrl = sSavePath + sThumbFile;
// Displaying success information
lblOutput.Text = "File uploaded successfully!";
// Destroy objects
myThumbnail.Dispose();
myBitmap.Dispose();
}
catch (ArgumentException errArgument)
{
// The file wasn't a valid jpg file
lblOutput.Text = "The file wasn't a valid jpg file.";
System.IO.File.Delete(Server.MapPath(sSavePath + sFilename));
}
}
}
public bool ThumbnailCallback()
{
return false;
}

I'd be surprised if the line myThumbnail.Save (Server.MapPath(sSavePath + sThumbFile)); works...
You are trying to map a file which doesn't exist yet!
Try
myThumbnail.Save(Server.MapPath(sSavePath) + sThumbFile));

Insert signature data into SQL Server in MVC 2 C#

I have working code that uses signature pad data to create and save a signature bmp image to a file location. My question is: how can I modify this code to insert the image into a SQL Server 2008 image field?
The following from my Controller obtains signature data from a signature tablet and creates a bmp image and saves it to a file location.
[PrincipalPermission(SecurityAction.Demand, Authenticated = true)]
public ActionResult SaveSignature2(IPrincipal principal) {
int userId = ((ScoutIdentity)principal.Identity).UserId.Value;
//Put user code to initialize the page here
SIGPLUSLib.SigPlus sigObj = new SIGPLUSLib.SigPlus();
sigObj.InitSigPlus();
sigObj.AutoKeyStart();
string visitorname = Request.Form["visitorname"];
visitorname = visitorname.Replace(" ", ""); //combines the first name with last name with no spaces
visitorname = visitorname.Trim();
string thevrvIDstr = Request.Form["vrvID"];
int thevrvID = Convert.ToInt32(thevrvIDstr);
//use the same data to decrypt signature
sigObj.AutoKeyData = Request.Form["SigText"];
sigObj.AutoKeyFinish();
sigObj.SigCompressionMode = 1;
sigObj.EncryptionMode = 2;
//Now, get sigstring from client
//Sigstring can be stored in a database if
//a biometric signature is desired rather than an image
sigObj.SigString = Request.Form["hidden"];
if (sigObj.NumberOfTabletPoints() > 0) {
sigObj.ImageFileFormat = 0;
sigObj.ImageXSize = 500;
sigObj.ImageYSize = 150;
sigObj.ImagePenWidth = 8;
sigObj.SetAntiAliasParameters(1, 600, 700);
sigObj.JustifyX = 5;
sigObj.JustifyY = 5;
sigObj.JustifyMode = 5;
long size;
byte[] byteValue;
sigObj.BitMapBufferWrite();
size = sigObj.BitMapBufferSize();
byteValue = new byte[size];
byteValue = (byte[])sigObj.GetBitmapBufferBytes();
sigObj.BitMapBufferClose();
System.IO.MemoryStream ms = new System.IO.MemoryStream(byteValue);
System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
String path;
path = System.AppDomain.CurrentDomain.BaseDirectory;
path = path + "/uploadFiles/Signatures/"+thevrvIDstr+".bmp";
img.Save(path, System.Drawing.Imaging.ImageFormat.Bmp);
ViewData["Result"] = ("Image saved successfully to " + path);
}
else {
ViewData["Result"] = "signature has not been returned successfully!";
}
ViewData["Result"] = sigObj.SigString;
//return RedirectToAction("vrSignIn");
return View();
}
I also have code elsewhere in my controller that gets an uploaded file and inserts it into the database. This code works OK.
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult UploadTempFiles(string id, string u)
{
//this method temporarily stores files
string userIdString = Cryptographer.DecryptSymmetric("RijndaelManaged", SecurityImpl.UrlToBase64(u));
int userId = Convert.ToInt32(userIdString);
if (Request.Files.Count > 0)
{
for (int i = 0; i < Request.Files.Count; i++)
{
HttpPostedFileBase file = Request.Files[i];
int contentlength = file.ContentLength;
byte[] b = new byte[contentlength];
Stream s;
s = file.InputStream;
s.Read(b, 0, contentlength);
VisitRequest.AddVisitorSignature(userId, b);
}
}
return View("UploadFiles");
}
I'm thinking that I can use some part of the second code to interrupt the image creation process in the first code and insert the image into the database INSTEAD of saving the image to a file location. I don't know how to do that.

I had same problem, and I solved it:
Comment these three lines:
//path = System.AppDomain.CurrentDomain.BaseDirectory;
//path = path + "/uploadFiles/Signatures/"+thevrvIDstr+".bmp";
//img.Save(path, System.Drawing.Imaging.ImageFormat.Bmp);
Convert image to String data (assumed that your variable 'strSignature' was declared before):
strSignature = img.ToString();
Save it with your Stored Procedure.
Hope this help you!