i am using this code in my asp.net website. its barcode generation code.. problem this code is depend on (IDAutomationHC39M) this font. so on localhost i have installed this font in my fonts folder and code is working successfully in local. but i do not know how to install this on server
string barCode = Request.QueryString["id"].ToString();
System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
using (Bitmap bitMap = new Bitmap(barCode.Length * 40, 80))
{
using (Graphics graphics = Graphics.FromImage(bitMap))
{
Font oFont = new Font("IDAutomationHC39M", 16);
PointF point = new PointF(2f, 2f);
SolidBrush blackBrush = new SolidBrush(Color.Black);
SolidBrush whiteBrush = new SolidBrush(Color.White);
graphics.FillRectangle(whiteBrush, 0, 0, bitMap.Width, bitMap.Height);
graphics.DrawString("*" + barCode + "*", oFont, blackBrush, point);
}
using (MemoryStream ms = new MemoryStream())
{
bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
byte[] byteImage = ms.ToArray();
Convert.ToBase64String(byteImage);
imgBarCode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
}
plBarCode.Controls.Add(imgBarCode);
}
Assuming a web based font will not work (ie you need to render your barcode server side and possibly embed it with other graphics / images), you can take the following approach. I didn't write this code but have used it and it does work.
You will need to load your font from a resource or possibly via a URL. Then pass the bits to the following. If loading from a resource, google that as there are a fair number of examples.
You can also use fontCollection.AddFontFile() and simplify your code but that will require access to the local (on server) filesystem.
public FontFamily GetFontFamily(byte[] bytes)
{
FontFamily fontFamily = null;
var handle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
try
{
var ptr = Marshal.UnsafeAddrOfPinnedArrayElement(bytes, 0);
var fontCollection = new PrivateFontCollection();
fontCollection.AddMemoryFont(ptr, bytes.Length);
fontFamily = fontCollection.Families[0];
}
finally
{
// don't forget to unpin the array!
handle.Free();
}
return fontFamily;
}
if you are developing for relatively modern browsers you can read up on #font-face
or, it may be just a simple matter of installing the font on your web server, typically you just need to copy the font file over to some folder on the server, say the desktop, and it should just be a simple matter of right clicking and selecting "install font"
Related
I can dynamically create a barcode using sample tutorials.
This block of code is in a loop and generates a number of images determined by user input. The image is in a place holder and is displayed on the same webpage.
I want the user to be able to have all the images on a separate page or file for them to print, but I'm not quite sure the best approach to do that. I tried placing it in a session, but I only get 1 image as opposed to the amount the user entered.
System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
using (Bitmap bitMap = new Bitmap(barCode.Length * 27, 100))
{
using (Graphics graphics = Graphics.FromImage(bitMap))
{
Font oFont = new Font("IDAutomationHC39M", 16);
PointF point = new PointF(2f, .2f);
SolidBrush blackBrush = new SolidBrush(Color.Black);
SolidBrush whiteBrush = new SolidBrush(Color.White);
graphics.FillRectangle(whiteBrush, 0, 0, bitMap.Width, bitMap.Height);
graphics.DrawString("*" + barCode + "*", oFont, blackBrush, point);
}
using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
bitMap.Save(ms, ImageFormat.Png);
byte[] byteImage = ms.ToArray();
Convert.ToBase64String(byteImage);
imgBarCode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
}
plBarCode.Controls.Add(imgBarCode);
}
i have an asp.net website, and i want to print some barcodes in c#. i use "IDAutomationHC39M" font as bellow:
public static void PrintSmallBarcode(HtmlGenericControl divBarCode, string barCode)
{
System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
using (Bitmap bitMap = new Bitmap(75, 18))
{
using (Graphics graphics = Graphics.FromImage(bitMap))
{
Font oFont = new Font("IDAutomationHC39M", 7);
PointF point = new PointF(0, 0);
SolidBrush blackBrush = new SolidBrush(Color.Black);
SolidBrush whiteBrush = new SolidBrush(Color.White);
graphics.FillRectangle(whiteBrush, 0, 0, bitMap.Width, bitMap.Height);
graphics.DrawString(barCode, oFont, blackBrush, point);
}
using (MemoryStream ms = new MemoryStream())
{
bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
byte[] byteImage = ms.ToArray();
Convert.ToBase64String(byteImage);
imgBarCode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
imgBarCode.CssClass = "cssbarcode";
}
}
div.Controls.Add(imgBarCode);
}
it works, but the quality of barcode is sow low, and my barcode reader device failed to read it. i can not increase the size of image, and of course i see a lot of good barcodes smaller than my size. i replace "IDAutomationHC39M" font with "free3of9.ttf", but this font just draw the number and no barcode line!.
how can i get a better barcode?
This is a long-standing problem with barcode fonts; they are enormous and scan horribly because printers try to anti-alias the bars.
Use images, not fonts, to draw barcodes. There are many packages available, for example Barcode Rendering Framework.
You can use other datas to change the size of the barcode.I used keepautomation barcode generator for asp.net to create barcode images in Visual C# ASP.NET project.After my settings,i can preview the size of the barcode.
I have created a bitmap and I want to save it in my upload folder. How can I do this?
My Code:
public FileResult image(string image)
{
var bitMapImage = new Bitmap(Server.MapPath("/Content/themes/base/images/photo.png"));
Graphics graphicImage = Graphics.FromImage(bitMapImage);
graphicImage.SmoothingMode = SmoothingMode.AntiAlias;
graphicImage.DrawString(image, new Font("Trebuchet MS,Trebuchet,Arial,sans-serif", 10, FontStyle.Bold), SystemBrushes.WindowFrame, new Point(15, 5));
graphicImage.DrawArc(new Pen(Color.Red, 3), 90, 235, 150, 50, 0, 360);
MemoryStream str = new MemoryStream();
bitMapImage.Save(str, ImageFormat.Png);
return File(str.ToArray(), "image/png");
}
The path I will use:
string mynewpath = Request.PhysicalApplicationPath + "Upload\\";
The Bitmap class has several overloads of the Save method. One of them takes a file name as parameter which means that you can use
bitMapImage.Save(mynewpath + "somefilename.png", ImageFormat.Png);
the question seems to be in conflict with your code (there you load a file from your images and return it) - anyway: there is a "Save" method on your Image-classes so just use this with the same Server.MapPath trick ... just make sure that the ASP.NET account has access/write rights for your target-folder:
string mynewpath = Request.PhysicalApplicationPath + "Upload\\myFile.png";
bitMapImage.Save(mynewpath);
remark: this is using your path but I don't know if this is really the right choice for your problem - as I said: MapPath should be the saver bet.
I created a function to allow uploaded transparent .png files to be inserted into a SQL Server database and the displayed on a web page via an HttpHandler.
While this all works, the png transparency changes to black when it's viewed on the web page. Is there a way of preserving the transparency?
Here's my image service which inserts into the database from the MVC controller:
public void AddImage(int productId, string caption, byte[] bytesOriginal)
{
string jpgpattern = ".jpg|.JPG";
string pngpattern = ".png|.PNG";
string pattern = jpgpattern;
ImageFormat imgFormat = ImageFormat.Jpeg;
if (caption.ToLower().EndsWith(".png"))
{
imgFormat = ImageFormat.Png;
pattern = pngpattern;
}
ProductImage productImage = new ProductImage();
productImage.ProductId = productId;
productImage.BytesOriginal = bytesOriginal;
productImage.BytesFull = Helpers.ResizeImageFile(bytesOriginal, 600, imgFormat);
productImage.BytesPoster = Helpers.ResizeImageFile(bytesOriginal, 198, imgFormat);
productImage.BytesThumb = Helpers.ResizeImageFile(bytesOriginal, 100, imgFormat);
productImage.Caption = Common.RegexReplace(caption, pattern, "");
productImageDao.Insert(productImage);
}
And here's the "ResizeImageFile" helper function:
public static byte[] ResizeImageFile(byte[] imageFile, int targetSize, ImageFormat imageFormat)
{
using (System.Drawing.Image oldImage = System.Drawing.Image.FromStream(new MemoryStream(imageFile)))
{
Size newSize = CalculateDimensions(oldImage.Size, targetSize);
using (Bitmap newImage = new Bitmap(newSize.Width, newSize.Height, PixelFormat.Format24bppRgb))
{
using (Graphics canvas = Graphics.FromImage(newImage))
{
canvas.SmoothingMode = SmoothingMode.AntiAlias;
canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
canvas.PixelOffsetMode = PixelOffsetMode.HighQuality;
canvas.DrawImage(oldImage, new Rectangle(new Point(0, 0), newSize));
MemoryStream m = new MemoryStream();
newImage.Save(m, imageFormat);
return m.GetBuffer();
}
}
}
}
What do I need to do to preserve the png transparency? Please show examples. I'm seriously not an expert with image manipulation.
Thanks.
Maybe try changing pixel format form PixelFormat.Format24bppRgb to PixelFormat.Format32bppRgb. You need the extra 8 bits to hold the alpha channel.
Using PixelFormat.Format32bppRgb didn't work for me. What worked however is using oldImage.PixelFormat when drawing the new image. So the corresponding line of code becomes:
using (Bitmap newImage = new Bitmap(newSize.Width, newSize.Height, oldImage.PixelFormat))
I want to write a small program in .NET 4.0 that will open a .jpg (or .jpeg) file, add a line of text to the image, and then resave the image as a .jpg. Does anyone know the easiest way to do this?
Thanks for any help.
Something like this:
var filePath = #"D:\Pictures\Backgrounds\abc.jpg";
Bitmap bitmap = null;
// Create from a stream so we don't keep a lock on the file.
using (var stream = File.OpenRead(filePath))
{
bitmap = (Bitmap)Bitmap.FromStream(stream);
}
using (bitmap)
using (var graphics = Graphics.FromImage(bitmap))
using (var font = new Font("Arial", 20, FontStyle.Regular))
{
// Do what you want using the Graphics object here.
graphics.DrawString("Hello World!", font, Brushes.Red, 0, 0);
// Important part!
bitmap.Save(filePath);
}
var myBitmap = new Bitmap("C:\\myImage.jpg");
var g = Graphics.FromImage(myBitmap);
g.DrawString("My\nText", new Font("Tahoma", 40), Brushes.White, new PointF(0, 0));