We Keep Coding

IronBarCode stream only

I want to create an QrCode using IronBarCode, and then save it as a Stream or Byte[].
However both methods expect the file to be saved prior to creation:
var absolute = Request.Scheme + "://" + Request.Host + url;
var qrcode = IronBarCode.QRCodeWriter.CreateQrCode(absolute);
qrcode.AddAnnotationTextAboveBarcode(device.Name);
qrcode.AddBarcodeValueTextBelowBarcode(absolute);
var f = qrcode.ToJpegStream();
var y = qrcode.ToJpegBinaryData();
ToJpegStream() and ToJpegBinaryData expects the absolute string to be an actual file path. I want to create a QrCode and save it as a Byte[] or Stream, however the error thrown is "The filename, directory name, or volume label syntax is incorrect."

AddBarcodeValueTextBelowBarcode method parameter for string is FontPath. That is why it was trying to find the font file that does not exist.
string absolute = "https://ironsoftware.com/";
string Name = "Product URL:";
//Add Annotation(text) below the generated barcode
var qrcode = QRCodeWriter.CreateQrCode(absolute);
qrcode.AddAnnotationTextBelowBarcode(Name);
qrcode.ToJpegBinaryData();
//Add Barcode value below the generated barcode
var qrcode = QRCodeWriter.CreateQrCode(absolute);
qrcode.AddBarcodeValueTextBelowBarcode();
qrcode.ToJpegBinaryData();
The below image is FontPath. FontPath is actually the directory path that actually lead to the Font file.
//This will add Barcode value into QRCode
.AddBarcodeValueTextBelowBarcode()
If you want to add absolute path to the QRCode you should use
//This will add your text to Barcode
.AddAnnotationTextBelowBarcode(absolute)
For more information on how to use the method please refer to the API reference:
https://ironsoftware.com/csharp/barcode/object-reference/api/IronBarCode.GeneratedBarcode.html#IronBarCode_GeneratedBarcode_AddBarcodeValueTextBelowBarcode

The issue mentioned isn't reproducible with the code provided. The code below is adapted from your code and the from the example. It's been tested.
Create a new Windows Forms App (.NET Framework)
Download/install NuGet package: Barcode
Add a Button to Form1 (name: btnCreateQRCode)
Add a PictureBox to Form1 (name: pictureBox1)
Add using directives:
using IronBarCode;
using System.IO;
Form1.cs:
public partial class Form1 : Form
{
private byte[] _qrCode = null;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private byte[] CreateBarCode(string url, string annotationText)
{
//create new instance
GeneratedBarcode qrCode = QRCodeWriter.CreateQrCode(url);
qrCode.AddAnnotationTextAboveBarcode(annotationText);
qrCode.AddBarcodeValueTextBelowBarcode(url);
byte[] qrCodeBytes = qrCode.ToJpegBinaryData();
return qrCodeBytes;
}
private void btnCreateQRCode_Click(object sender, EventArgs e)
{
_qrCode = CreateBarCode("https://www.google.com/search?q=how+to+search", "How To Search");
using (MemoryStream ms = new MemoryStream(_qrCode))
{
pictureBox1.Image = Image.FromStream(ms);
pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage; //fit to size
pictureBox1.Refresh();
}
}
}
Resources:
Create QR Code

Memory/Resources not being released

I am using two windows forms, first form will have multiple image files populated in datagridview and on the second form all those images are placed in another datagridview control, the second datagridview control has a button as Delete Image that will delete the file.
after i click the button exception occurs as file is being used. but i alread have disposed the datagridview and also cleared its rows but still it is causing not to release the image. I already have tried to call GC.Collect(); Method but it didn't helped. my sample code is below.
On First form:
// Commenting the code above
if (validuser)
{
dgvImages.Rows.Clear();
dgvImages.Dispose();
GC.Collect();
var form = new NewForm();
form.Show();
this.Hide();
}
and on second form:
private void dgvImages_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
try
{
if (e.ColumnIndex == 1)
{
string selectedpath = dgvImages.Rows[e.RowIndex].Cells[2].Value.ToString(); // this cell contains the full path of the image
if (File.Exists(selectedpath))
{
dgvImages.Rows.Clear();
dgvImages.Dispose();
GC.Collect();
GC.WaitForPendingFinalizers();
File.Delete(selectedpath);
LoadImages();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message); // File is in use
}
}
EDIT: Here is how i am loading images
private void LoadImages()
{
if (Directory.Exists(path))
{
DirectoryInfo dir = new DirectoryInfo(path);
FileInfo[] files = dir.GetFiles();
foreach (var f in files)
{
if (f.Extension.ToLower() == ".jpg" || f.Extension.ToLower() == ".png" || f.Extension.ToLower() == ".bmp" || f.Extension.ToLower() == ".tiff")
{
dgvImages.Rows.Add((Image.FromFile(f.FullName)), "Delete Image" ,f.FullName);
}
}
}
}

By default when you use Image.FromFile it will lock the file until the image is disposed.
As per the MSDN resources
https://msdn.microsoft.com/en-us/library/4sahykhd(v=vs.110).aspx
What you want to do is load your images as per this answer here.
Open Image from file, then release lock?
Image img;
using (var bmpTemp = new Bitmap("image_file_path"))
{
img = new Bitmap(bmpTemp, true);
}
According to the new Bitmap documentation you may need to get it to use icm.
https://msdn.microsoft.com/en-us/library/3135s427(v=vs.110).aspx
Use this constructor to open images with the following file formats: BMP, GIF, EXIF, JPG, PNG and TIFF.

Image.FromFile() method lock the file by GDI+
Load image from stream using the following code:
public Image GetmageFromStream(string path)
{
using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read)) {
var img = Image.FromStream(fs);
return img;
}
}

wpf how to save and load image from database - what approach?

I am developing a desktop application using wpf.I will need to store some pictures and show them after.I need a textbox with the link to the database,and that will be saved in a database.They told me that the best approach is to save a image path to the database,not the image itself.
Is that better then blob?I can't find any example with the path on the new,only with blob...

You can save image to the database as a link, but beforehand rename it to GUID to ensure uniqueness of reference you will be storing

/this is my code , and you can save an image into datebase/
namespace WpfApp1
{
public partial class saveImage : Window
{
public saveImage()
{
InitializeComponent();
}
OpenFileDialog Op = new OpenFileDialog();
private void Button_Click(object sender, RoutedEventArgs e)
{
Op.Title = "image selection";
Op.Filter = "JPG(.jpg)|*.jpg|PNG(.png)|*.png|JPEG(.jpeg)|*.jpeg";
if (Op.ShowDialog() == true)
{
img1.Source = new BitmapImage(new Uri(Op.FileName));
}
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
PersonAccountingdbEntities db = new PersonAccountingdbEntities();
tbl_Setting set = new tbl_Setting();
set.Image1 = File.ReadAllBytes(Op.FileName);
db.tbl_Setting.Add(set);
db.SaveChanges();
MessageBox.Show("image has been saved");
}
}
}

Deleting File which is displayed in picturebox

I am selecting file from openfiledialoge and displaying it in picturebox and its name in textbox when I click on delete button I am getting exception The process cannot access the file because it is being used by another process.
I searched a lot for this exception to get resolved but i didn't fine any of them working, when i tried closing file with imagename which is in textbox i.e the file i am displaying in picturebox ; using IsFileLocked method,this closes and deletes all files of particular directory path ,but how can I delete the only file shown in picturebox,where I am going wrong
public partial class RemoveAds : Form
{
OpenFileDialog ofd = null;
string path = #"C:\Users\Monika\Documents\Visual Studio 2010\Projects\OnlineExam\OnlineExam\Image\"; // this is the path that you are checking.
public RemoveAds()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (System.IO.Directory.Exists(path))
{
ofd = new OpenFileDialog();
ofd.InitialDirectory = path;
DialogResult dr = new DialogResult();
if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
Image img = new Bitmap(ofd.FileName);
string imgName = ofd.SafeFileName;
txtImageName.Text = imgName;
pictureBox1.Image = img.GetThumbnailImage(350, 350, null, new IntPtr());
ofd.RestoreDirectory = true;
}
}
else
{
return;
}
}
private void button2_Click(object sender, EventArgs e)
{
//Image img = new Bitmap(ofd.FileName);
string imgName = ofd.SafeFileName;
if (Directory.Exists(path))
{
var directory = new DirectoryInfo(path);
foreach (FileInfo file in directory.GetFiles())
{ if(!IsFileLocked(file))
file.Delete();
}
}
}
public static Boolean IsFileLocked(FileInfo path)
{
FileStream stream = null;
try
{ //Don't change FileAccess to ReadWrite,
//because if a file is in readOnly, it fails.
stream = path.Open ( FileMode.Open, FileAccess.Read, FileShare.None );
}
catch (IOException)
{ //the file is unavailable because it is:
//still being written to or being processed by another thread
//or does not exist (has already been processed)
return true;
}
finally
{
if (stream != null)
stream.Close();
}
//file is not locked
return false;
}
}
Thanks in advance for any help

The (previously) accepted answer to this question is very poor practice. If you read the documentation on System.Drawing.Bitmap, in particular for the overload that creates a bitmap from a file, you will find :
The file remains locked until the Bitmap is disposed.
in your code you create the bitmap and store it in a local variable but you never dispose of it when you are done. This means your image object has gone out of scope but has not released its lock on the image file you are trying to delete. For all objects that implement IDisposable (like Bitmap) you must dispose of them yourself. See this question for example (or search for others - this is a very important concept!).
To correct the problem properly you simply need to dispose of the image when you are done with it :
if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
Image img = new Bitmap(ofd.FileName); // create the bitmap
string imgName = ofd.SafeFileName;
txtImageName.Text = imgName;
pictureBox1.Image = img.GetThumbnailImage(350, 350, null, new IntPtr());
ofd.RestoreDirectory = true;
img.Dispose(); // dispose the bitmap object
}
Please do not take the advice in the answer below - you should nearly never need to call GC.Collect and if you need to do it to make things work it should be a very strong signal that you are doing something else wrong.
Also, if you only want to delete the one file (the bitmap you have displayed) your deletion code is wrong and will delete every file in the directory as well (this is just repeating Adel's point). Further, rather than keep a global OpenFileDialog object alive simply to store the file name, I would suggest getting rid of that and saving just the file info :
FileInfo imageFileinfo; //add this
//OpenFileDialog ofd = null; Get rid of this
private void button1_Click(object sender, EventArgs e)
{
if (System.IO.Directory.Exists(path))
{
OpenFileDialog ofd = new OpenFileDialog(); //make ofd local
ofd.InitialDirectory = path;
DialogResult dr = new DialogResult();
if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
Image img = new Bitmap(ofd.FileName);
imageFileinfo = new FileInfo(ofd.FileName); // save the file name
string imgName = ofd.SafeFileName;
txtImageName.Text = imgName;
pictureBox1.Image = img.GetThumbnailImage(350, 350, null, new IntPtr());
ofd.RestoreDirectory = true;
img.Dispose();
}
ofd.Dispose(); //don't forget to dispose it!
}
else
{
return;
}
}
Then in your second button handler you can just delete the one file you are interested in.
private void button2_Click(object sender, EventArgs e)
{
if (!IsFileLocked(imageFileinfo))
{
imageFileinfo.Delete();
}
}

I had the same problem : I loaded a file in a PictureBox and when trying to delete it I got the same exception.
This occurred only when the image was displayed.
I tried them all :
picSelectedPicture.Image.Dispose();
picSelectedPicture.Image = null;
picSelectedPicture.ImageLocation = null;
and still got the same exception.
Then I found this on CodeProject : [c#] delete image which is opened in picturebox.
Instead of using PictureBox.Load() it creates an Image from the file and sets it as PictureBox.Image:
...
// Create image from file and display it in the PictureBox
Image image = GetCopyImage(imagePath);
picSelectedPicture.Image = image;
...
private Image GetCopyImage(string path) {
using (Image image = Image.FromFile(path)) {
Bitmap bitmap = new Bitmap(image);
return bitmap;
}
}
No more exceptions when I delete the file.
IMHO, this is the most suitable solution.
EDIT
I forgot to mention that you can safely delete the file immediately after display :
...
// Create image from file and display it in the PictureBox
Image image = GetCopyImage(imagePath);
picSelectedPicture.Image = image;
System.IO.File.Delete(imagePath);
...

use this code
string imgName = ofd.SafeFileName;
if (Directory.Exists(path))
{
var directory = new DirectoryInfo(path);
foreach (FileInfo file in directory.GetFiles())
{
GC.Collect();
GC.WaitForPendingFinalizers();
file.Delete();
}
}

Your button2_Click event handler is cycling through all the files inside your directory & doing the deletes.
You need to change your code like the following:
public partial class RemoveAds : Form
{
OpenFileDialog ofd = null;
string path = #"C:\Users\Monika\Documents\Visual Studio 2010\Projects\OnlineExam\OnlineExam\Image\"; // this is the path that you are checking.
string fullFilePath;
public RemoveAds()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (System.IO.Directory.Exists(path))
{
ofd = new OpenFileDialog();
ofd.InitialDirectory = path;
DialogResult dr = new DialogResult();
if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
Image img = new Bitmap(ofd.FileName);
string imgName = ofd.SafeFileName;
txtImageName.Text = imgName;
pictureBox1.Image = img.GetThumbnailImage(350, 350, null, new IntPtr());
fullFilePath = ofd.FilePath;
ofd.RestoreDirectory = true;
}
}
else
{
return;
}
}
private void button2_Click(object sender, EventArgs e)
{
FileInfo file = new FileInfo(fullFilePath);
if(!IsFileLocked(file))
file.Delete();
}
}
public static Boolean IsFileLocked(FileInfo path)
{
FileStream stream = null;
try
{ //Don't change FileAccess to ReadWrite,
//because if a file is in readOnly, it fails.
stream = path.Open ( FileMode.Open, FileAccess.Read, FileShare.None );
}
catch (IOException)
{ //the file is unavailable because it is:
//still being written to or being processed by another thread
//or does not exist (has already been processed)
return true;
}
finally
{
if (stream != null)
stream.Close();
}
//file is not locked
return false;
}
}

By using GetThumnailImage you have to specify the width and height which is static.
Use the Load method instead.
eg: pictureBox1.Load(Path to the image); by using this u will have no problem in deleting the image or the folder before closing the app. no other methods need to be created.
hope this helps

Drag and Drop file transfer in WPF. How to get file name of the dropped content in a window

I'm creating a local file transfer app. I would like the user to drag-drop an item into the file transfer application to initiate the file transfer just like skype or other messengers.
While dropping an item. The drop event was triggered. But, I don't know where to get the details of the item such as Location, Size etc., eg., If I drop an Image. I want to read the details mentioned above.
Note:I have enabled the AllowDrop & Subsribed to Drop event.[If that helps]

Do you mean Size of file or Size of image in pixel?
Anyway, use this code:
private void Window_Drop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop, true))
{
string[] droppedFilePaths = e.Data.GetData(DataFormats.FileDrop, true) as string[];
foreach (var path in droppedFilePaths)
{
string location = null;
int pxWidth = 0, pxHeight = 0;
FileInfo fi = new FileInfo(path);
//fi.Length //File size
//fi.DirectoryName //Directory
using (var fs = fi.OpenRead())
{
try
{
var bmpFrame = BitmapFrame.Create(fs);
var m = bmpFrame.Metadata as BitmapMetadata;
if (m != null)
location = m.Location;
pxWidth = bmpFrame.PixelWidth;
pxHeight = bmpFrame.PixelHeight;
}
catch
{
//File isn't image
}
}
this.fileList.Items.Add(string.Format("({0}x{1}), location: {2}", pxWidth, pxHeight, location));
}
}
}