I am trying to move my code from using System.Drawing.Image to using SkiaSharp as recommended here.
I trying to find similar operations for working with Tif files from a stream.
Currently, the following is what I have using System.Drawing.Image:
System.Drawing.Image MyImage = System.Drawing.Image.FromStream(inStream);
PdfDocument doc = new PdfDocument();
for (int PageIndex = 0; PageIndex < MyImage.GetFrameCount(FrameDimension.Page); PageIndex++)
{
MyImage.SelectActiveFrame(FrameDimension.Page, PageIndex);
XImage img = XImage.FromGdiPlusImage(MyImage);
var page = new PdfPage();
page.Width = MyImage.Width;
page.Height = MyImage.Height;
doc.Pages.Add(page);
XGraphics xgr = XGraphics.FromPdfPage(doc.Pages[PageIndex]);
xgr.DrawImage(img, 0, 0, page.Width, page.Height);
}
doc.Save(outStream);
MyImage.Dispose();
My current work with SkiaSharp is the following though it does not work correctly. Note: The following code has the following error and I am trying to figure out why in addition to how to select active frames: Unhandled exception. System.ObjectDisposedException: Cannot access a closed Stream. likely due to SKCodec codec = SkiaSharp.SKCodec.Create(inStream); but I am not sure why.
PdfDocument doc = new PdfDocument();
doc.Info.CreationDate = new DateTime();
using MemoryStream inStream = new MemoryStream(data);
using var imgStream = new SKManagedStream(inStream, false);
using var skData = SKData.Create(imgStream);
using SKCodec codec = SKCodec.Create(skData);
// TODO: codec is null!
for (int PageIndex = 0; PageIndex < codec.FrameCount; PageIndex++)
{
SKImageInfo imageInfo = new SKImageInfo(codec.Info.Width, codec.Info.Height);
// create bitmap stub
using SKBitmap skBitmap = new SKBitmap(imageInfo);
IntPtr pixelsPtr = skBitmap.GetPixels();
// decode particular frame into the bitmap
codec.GetPixels(imageInfo, pixelsPtr, new SKCodecOptions(PageIndex));
// encode bitmap back
using SKData encodedData = skBitmap.Encode(SKEncodedImageFormat.Png, 100);
using Stream frameStream = encodedData.AsStream();
XImage img = XImage.FromStream(frameStream);
var page = new PdfPage();
doc.Pages.Add(page);
XGraphics xgr = XGraphics.FromPdfPage(doc.Pages[PageIndex]);
xgr.DrawImage(img, 0, 0, page.Width, page.Height);
}
doc.Save(destination);
These are other things I have tried:
Using SKCodecOptions to set the FrameIndex but how would I use it since it used for GetPixels() not Decode().
There are no properties, I found, that control FrameIndex within a SKBitmap.
The additional conversion from Image to XImage is a bit confusing as from the source here, it appears to be a constructor that creates an XImage straight from an Image. I would need to create an XImage from a SkiaSharp.SKBitmap instead I believe thought I'm not quite sure how to do this at the moment such as use an existing method like FromStream() though I don't know the differences between the uses necesarily.
You get the exception because decoding SKBitmap with
SkiaSharp.SKBitmap MyImage = SkiaSharp.SKBitmap.Decode(inStream);
disposes the inStream.
Anyway, to get the particular frame using SkiaSharp, you need to get pixels from the codec:
using MemoryStream inStream = new MemoryStream(data);
PdfDocument doc = new PdfDocument();
doc.Info.CreationDate = new DateTime();
using SKCodec codec = SkiaSharp.SKCodec.Create(inStream);
for (int PageIndex = 0; PageIndex < codec.FrameCount; PageIndex++)
{
SKImageInfo imageInfo = new SKImageInfo(codec.Info.Width, codec.Info.Height);
// create bitmap stub
using SKBitmap skBitmap = new SKBitmap(imageInfo);
IntPtr pixelsPtr = skBitmap.GetPixels();
// decode particular frame into the bitmap
codec.GetPixels(imageInfo, pixelsPtr, new SKCodecOptions(PageIndex));
// encode bitmap back
using SKData encodedData = skBitmap.Encode(SKEncodedImageFormat.Png, 100);
using Stream frameStream = encodedData.AsStream();
XImage img = XImage.FromStream(frameStream);
var page = new PdfPage();
doc.Pages.Add(page);
XGraphics xgr = XGraphics.FromPdfPage(doc.Pages[PageIndex]);
xgr.DrawImage(img, 0, 0, page.Width, page.Height);
}
doc.Save(destination);
I am using selenium C# to take screenshots. Convert as Bitmap and then Save to specific path. After save complete. I want to delete that same screenshot. It doesn't allow me to delete and throw the file that is being used by another process.
Below is my code:
public Bitmap GetScreenshot(IWebDriver driver)
{
//Take Screenshot
Screenshot screenshot = (driver as ITakesScreenshot).GetScreenshot();
//Convert Screenshot to Bitmap
var img = Image.FromStream(new MemoryStream(screenshot.AsByteArray)) as Bitmap;
return img;
}
I used above function like this:
var img = GetScreenshot(driver);
seleniumExtras.SaveImageAsPDF(img, "fullpage.jpeg");
Here is the function SaveImageAsPDF:
public void SaveImageAsPDF(Bitmap imageData, string ImagePath)
{
imageData.Save(ImagePath, ImageFormat.Jpeg);
imageData.Dispose();
//Save as PDF
System.Drawing.Image image = System.Drawing.Image.FromFile(ImagePath);
iTextSharp.text.Document doc = new iTextSharp.text.Document(iTextSharp.text.PageSize.A4);
doc.SetPageSize(iTextSharp.text.PageSize.A4.Rotate());
iTextSharp.text.pdf.PdfWriter.GetInstance(doc, new FileStream(ImagePath.Replace(".jpeg", ".pdf"), FileMode.Create));
doc.Open();
iTextSharp.text.Image pdfImage = iTextSharp.text.Image.GetInstance(image, System.Drawing.Imaging.ImageFormat.Jpeg);
//pdfImage.SetAbsolutePosition(0, 0); // set the position to bottom left corner of pdf
pdfImage.ScaleAbsolute(iTextSharp.text.PageSize.A4.Width, iTextSharp.text.PageSize.A4.Height); // set the height and width of image to PDF page size
pdfImage.ScaleToFit(iTextSharp.text.PageSize.A4.Width, iTextSharp.text.PageSize.A4.Height);
doc.Add(pdfImage);
doc.Close();
doc.Dispose();
//Delete image file after PDF created
System.GC.Collect();
System.GC.WaitForPendingFinalizers();
//imageData.Dispose();
imageData.Dispose();
if (File.Exists(ImagePath))
File.Delete(ImagePath);
}
I'm trying to load an image into an asp image control.
That image is generated from zxing Barcode Writter.
My question is, can I load it wihtout physically saving it first?
string barcode = "xxxxxx";
BarcodeWriter writer = new BarcodeWriter() { Format = BarcodeFormat.CODE_128 };
imgBarCode.ImageUrl = writer.Write(barcode);
... How can I reference writer.Writer to image control "imgBarCode"
With the suggestion made by user1429080 I ended up with this:
string barcode = "12345"
BarcodeWriter writer = new BarcodeWriter() { Format = BarcodeFormat.CODE_128, Options = new ZXing.Common.EncodingOptions { Height = 100, Width = 300 } };
var bitmap = writer.Write(barcode);
MemoryStream ms = new MemoryStream();
bitmap.Save(ms, ImageFormat.Jpeg);
var b64 = Convert.ToBase64String(ms.ToArray());
imgBarCode.ImageUrl = "data:image/jpeg;base64," + b64;
I am trying to use PDFsharp to insert a dynamically generated bitmap of a QR Code in to a PDF document. I don't want to save the bitmap to the file but just want to insert it into the PDF. The problem I'm having is the DrawImage command is looking for a string where the image file is located. But I don't want to save the file, I just want to insert it into the PDF document. Is there a way of doing this?
var QRCode_BMP = _generalCode.QR_CodeGenerator(AddReviewPath); //This generates the bitmap
MemoryStream streamQR = new MemoryStream();
QRCode_BMP.Save(streamQR, System.Drawing.Imaging.ImageFormat.Jpeg); //save bitmap into memory stream in jpeg format System.Drawing.Image QR_Jpeg = System.Drawing.Image.FromStream(streamQR);// save memory stream to image file
XImage xImage = XImage.FromGdiPlusImage(QR_Jpeg);
gfx = XGraphics.FromPdfPage(page);
DrawImage(gfx, xImage, 0, 0, 100, 100); //This is not working
QRCode_BMP.Dispose();
streamQR.Close();
gfx.Dispose();
You create a QR code in QRCode_BMP and then you create an XImage from QR_Jpeg and write it is not working.
QRCode_BMP is only used to create a stream that is never used. We don't see where QR_Jpeg is coming from.
Provide a complete sample.
BTW: You can use XImage.FromStream to use the stream you created.
P.S.: IMHO JPEG is a bad choice for QR codes. Just use BMP and PDFsharp will use a lossless compression.
This is how I made it work;
PdfDocument pdf = PdfGenerator.GeneratePdf("<b>some html here</b>", PageSize.A4);
QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeData qrCodeData = qrGenerator.CreateQrCode("some text here", QRCodeGenerator.ECCLevel.Q);
QRCode qrCode = new QRCode(qrCodeData);
Bitmap qrCodeImage = qrCode.GetGraphic(10);
PdfPage page = pdf.Pages[0]; //I will add it to 1st page
// Get an XGraphics object for drawing
XGraphics gfx = XGraphics.FromPdfPage(page);
XImage image = XImage.FromGdiPlusImage(qrCodeImage); //you can use XImage.FromGdiPlusImage to get the bitmap object as image (not a stream)
gfx.DrawImage(image, 50, 50, 150, 150);
//save your pdf, dispose other objects
Using XImage.FromStream like #I liked the old Stack Overflow mentioned, in your posted code you should be able to just use:
var QRCode_BMP = _generalCode.QR_CodeGenerator(AddReviewPath); //This generates the bitmap
MemoryStream streamQR = new MemoryStream();
QRCode_BMP.Save(streamQR, System.Drawing.Imaging.ImageFormat.Jpeg); //save bitmap into memory stream in jpeg format System.Drawing.Image QR_Jpeg = System.Drawing.Image.FromStream(streamQR);// save memory stream to image file
//XImage xImage = XImage.FromGdiPlusImage(QR_Jpeg); // <-- Removed
gfx = XGraphics.FromPdfPage(page);
gfx.DrawImage(XImage.FromStream(streamQR), 0, 0, 100, 100); // <-- Added
//DrawImage(gfx, xImage, 0, 0, 100, 100); //This is not working // <-- Removed
QRCode_BMP.Dispose();
streamQR.Close();
gfx.Dispose();
For general usage of streams for XGraphics.DrawImage (library PDFSharp) here's some code I use to print SVG vector path data to PDF:
System.Windows.Shapes.Path path = new System.Windows.Shapes.Path();
// YouTube like button SVG vector path data:
path.Data = Geometry.Parse("M12.42,14A1.54,1.54,0,0,0,14,12.87l1-4.24C15.12,7.76,15,7,14,7H10l1.48-3.54A1.17,1.17,0,0,0,10.24,2a1.49,1.49,0,0,0-1.08.46L5,7H1v7ZM9.89,3.14A.48.48,0,0,1,10.24,3a.29.29,0,0,1,.23.09S9,6.61,9,6.61L8.46,8H14c0,.08-1,4.65-1,4.65a.58.58,0,0,1-.58.35H6V7.39ZM2,8H5v5H2Z");
// Visual check of the path:
// https://yqnn.github.io/svg-path-editor/
// Color area bordered through path of SVG vector:
path.Fill = new SolidColorBrush(Colors.Black);
// Upscale path, if final image is blurry:
double scale = 2;
path.RenderTransform = new ScaleTransform(scale, scale);
Rect bounds = path.Data.GetRenderBounds(null);
// Increase render bounds (here: "+ 4"), if parts of the path in the final image are cut off (test it with "scale = 1" before upscaling):
bounds.Width = (bounds.Width + 4) * scale;
bounds.Height = (bounds.Height + 4) * scale;
path.Measure(bounds.Size);
path.Arrange(bounds);
RenderTargetBitmap bitmap = new RenderTargetBitmap(
(int)bounds.Width, (int)bounds.Height, 96, 96, PixelFormats.Pbgra32);
bitmap.Render(path);
// Transparent areas are replaced with black pixels when using a "BmpBitmapEncoder", so instead use a "PngBitmapEncoder":
PngBitmapEncoder encoderPng = new PngBitmapEncoder();
encoderPng.Frames.Add(BitmapFrame.Create(bitmap));
using (MemoryStream stream = new MemoryStream())
{
encoderPng.Save(stream);
// Draw image to PDF using "XGraphics.DrawImage":
gfx.DrawImage(XImage.FromStream(stream), 10, 100, 14.05, 12.05);
}
i'am making a programm where i want my RichTextBox
content (text+images) to be saved as an image (jpg/png). I tried to use this solution
but i get only black filled image from
SaveUIAsGraphicFile()
I also tried to create FormattedText from my rtb control, printing it works fine, but its not possible to insert images in there. Maybe it is possible to print FlowDocument somehow?
You could use something like the following method to create a bitmap from a FlowDocument:
public BitmapSource FlowDocumentToBitmap(FlowDocument document, Size size)
{
document = CloneDocument(document);
var paginator = ((IDocumentPaginatorSource)document).DocumentPaginator;
paginator.PageSize = size;
var visual = new DrawingVisual();
using (var drawingContext = visual.RenderOpen())
{
// draw white background
drawingContext.DrawRectangle(Brushes.White, null, new Rect(size));
}
visual.Children.Add(paginator.GetPage(0).Visual);
var bitmap = new RenderTargetBitmap((int)size.Width, (int)size.Height,
96, 96, PixelFormats.Pbgra32);
bitmap.Render(visual);
return bitmap;
}
public FlowDocument CloneDocument(FlowDocument document)
{
var copy = new FlowDocument();
var sourceRange = new TextRange(document.ContentStart, document.ContentEnd);
var targetRange = new TextRange(copy.ContentStart, copy.ContentEnd);
using (var stream = new MemoryStream())
{
sourceRange.Save(stream, DataFormats.XamlPackage);
targetRange.Load(stream, DataFormats.XamlPackage);
}
return copy;
}
and then use it like shown below to save a RichTextBox's Document to an image file.
var doc = richTextBox.Document;
var bm = FlowDocumentToBitmap(doc, new Size(richTextBox.ActualWidth, richTextBox.ActualHeight));
var encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bm));
using (var stream = new FileStream("doc.jpg", FileMode.Create))
{
encoder.Save(stream);
}
You can spend HOURS chasing around trying to figure out why the width is wrong when in reality its trying to paginate in columns. Set the document's columnwidth to the full width of your output bitmap.
public Bitmap FlowDocumentToBitmap(FlowDocument document, Size size)
{
document = CloneDocument(document);
document.ColumnWidth = size.Width;// <- Add this line