Is there a good library I can use in c# to take a screenshot/snapshot?
One where I can drag and drop a region of my screen, to take a screenshot/snapshot of it?
I'm not aware of any libraries that allow you to visually select a region on your screen, but a screenshot of your whole screen can be taken using the Graphics.CopyFromScreen method as follows:
var bounds = Screen.PrimaryScreen.Bounds;
using (var bmp = new Bitmap(bounds.Width,
bounds.Height,
PixelFormat.Format32bppArgb))
using (var gfx = Graphics.FromImage(bmp))
{
gfx.CopyFromScreen(bounds.X,
bounds.Y,
0,
0,
bounds.Size,
CopyPixelOperation.SourceCopy);
bmp.Save("shot.png");
}
Related
This question already has answers here:
C#: how to take a screenshot of a portion of screen
(4 answers)
Closed 1 year ago.
I want to take a screenshot of a specific part of a website using C# or .net Code, I can't create a Windows form application as it must be embedded into something else.
Here is what I got so far:
using System.Drawing.Imaging;
using System.Drawing;
using System;
using System.Windows.Forms;
try
{
//Creating a new Bitmap object
Bitmap captureBitmap = new Bitmap(1024, 768, PixelFormat.Format32bppArgb);
//Bitmap captureBitmap = new Bitmap(int width, int height, PixelFormat);
//Creating a Rectangle object which will
//capture our Current Screen
Rectangle captureRectangle = Screen.AllScreens[0].Bounds;
//Creating a New Graphics Object
Graphics captureGraphics = Graphics.FromImage(captureBitmap);
//Copying Image from The Screen
captureGraphics.CopyFromScreen(captureRectangle.Left,captureRectangle.Top,0,0,captureRectangle.Size);
//Saving the Image File (I am here Saving it in My E drive).
captureBitmap.Save(#"E:\Capture.jpg",ImageFormat.Jpeg);
//Displaying the Successfull Result
MessageBox.Show("Screen Captured");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
This code works fine as long as I am creating a windows form application, but as soon as I change it to console it doesn't work even after adding the "using System.Windows.Forms;" and it produces this error:
//Screen does not exist in the current context
So Is there any solution for this or any other way I could take a screenshot of a specific part of a website Programmatically without connecting to it at all.
Thanks in advance.
I actually found an answer one minute after posting from the suggested links "which btw didn't show in search I did for 2 days for some reason" but anyway
its This question
and its as simple as
Rectangle rect = new Rectangle(0, 0, 100, 100);
Bitmap bmp = new Bitmap(rect.Width, rect.Height, PixelFormat.Format32bppArgb);
Graphics g = Graphics.FromImage(bmp);
g.CopyFromScreen(rect.Left, rect.Top, 0, 0, bmp.Size,
CopyPixelOperation.SourceCopy);
bmp.Save(fileName, ImageFormat.Jpeg);
I need to draw a video to another window where I could get the device context hDC using GetDCEx. I can already achieve drawing using System.Drawing.Graphics:
g = Graphics.FromHdc(hdc);
// Now I need to get the video frame/bitmap here
g.DrawImage(frameBitmap, 0, 0);
However I don't think System.Drawing has any class for video rendering, so I plan to use System.Windows.Media.MediaPlayer. However, the best I could do is to get it to RenderTargetBitmap. There is a way to use an encoder to render to Bitmap file and then decoding it to System.Drawing.Image, but I think it would be too slow.
So either of these can solve my problem, please tell me if any is possible:
Can a WPF DrawingVisual draw on a hDC?
Can a DrawingVisual somehow draws on a Graphics?
A quick way to get System.Drawing.Bitmap from DrawingVisual/MediaPlayer/VideoDrawing?
I am using Bitmap data copying (LockBits) and it's fast enough. Thanks to this answer.
public Bitmap Render()
{
var bitmapRender = this.CreateRenderTargetBitmap();
using (var drawingContext = this.drawingVisual.RenderOpen())
{
drawingContext.DrawVideo(this.MediaPlayer, this.drawingRect);
drawingContext.Close();
}
bitmapRender.Render(this.drawingVisual);
var result = new Bitmap(this.Width, this.Height, DrawingPixelFormat);
var bitmapData = result.LockBits(
this.renderRect,
System.Drawing.Imaging.ImageLockMode.WriteOnly,
DrawingPixelFormat);
bitmapRender.CopyPixels(
Int32Rect.Empty,
bitmapData.Scan0,
bitmapData.Stride * bitmapData.Height,
bitmapData.Stride);
result.UnlockBits(bitmapData);
return result;
}
RenderTargetBitmap CreateRenderTargetBitmap() => new RenderTargetBitmap(
this.Width, this.Height,
this.Dpi, this.Dpi,
WpfPixelFormat);
What should I use in C# windows forms to create a app to make screenshot like Yahoo Messenger does?
This is an example:
How is that transparent cover made? A form?
First of all you need a global keyboard hook and check for the input of the printscreen key (prt sc)
Take a look at this:
Global keyboard capture in C# application
Second thing is to take a screenshot of the whole screen.
Size res = new Size(
Screen.PrimaryScreen.Bounds.Width,
Screen.PrimaryScreen.Bounds.Height
);
Point ptr = new Point(
Screen.PrimaryScreen.Bounds.X,
Screen.PrimaryScreen.Bounds.Y
);
using (var bmp = new Bitmap(res.Width, res.Height))
{
using (var gfx = Graphics.FromImage(gmp))
{
gfx.CopyFromScreen(ptr.X, ptr.Y, 0, 0, bmp.Size, CopyPixelOperation.SourceCopy);
}
}
Now all you have to is implement some way to crop the screenshot. This is not a spoonfeeding community, so the rest is up to you, besides you have to be more specific.
This one is slightly confusing...
I am using Adobe's PDF Viewer control to view PDFs but I want the user to be able to drag an image onto the PDF and then when they click save it adds the image to the PDF at that location.
Implementing the PDF viewer proved quite difficult but I decided in the end to use Adobe's control, take a picture and then allow the user to draw the image ontop of the picture of the PDF. When they click save I am going to use PDFSharp to put the image onto the PDF once I've worked out where it goes but the problem I have at the moment is that I can't get a picture of the PDF.
The following code is used to get the picture but the Panel that it is attached to just appears with a white background with a red 'X' and border...
using (Bitmap bitmap = new Bitmap(adobePDFViewer1.Width, adobePDFViewer1.Height))
{
using (Graphics g = Graphics.FromImage(bitmap))
{
g.CopyFromScreen(new Point(adobePDFViewer1.Left, adobePDFViewer1.Top), Point.Empty, adobePDFViewer1.Size);
}
panelOverPdfViewer.BackgroundImage = bitmap;
}
I don't think this is the best way of doing it but I couldn't work out any others. Any help would be appreciated!
EDIT:
Following a very helpful answer below this is working code:
Here is the code I used:
Bitmap printscreen = new Bitmap(adobePDFViewer1.Width, adobePDFViewer1.Height);
Graphics graphics = Graphics.FromImage(printscreen as Image);
int left = this.Left + 396;
int top = this.Top + 30;
graphics.CopyFromScreen(left, top, 0, 0, printscreen.Size);
pictureBoxOverPDFView.Image = printscreen;
Look at this this Print-Screen
and try this for test work of CopyFromScreen
private void PrintScreen()
{
Bitmap printscreen = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
Graphics graphics = Graphics.FromImage(printscreen as Image);
graphics.CopyFromScreen(0, 0, 0, 0, printscreen.Size);
printscreen.Save(#"C:\Temp\printscreen.jpg", ImageFormat.Jpeg);
}
How would I create an application that records the users interactions with the desktop in C# and then convert it to a video format such as avi?
To capture screenshots you can use CopyFromScreen.
Simple C# example:
Rectangle bounds = Screen.GetBounds(Point.Empty);
using(Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height))
{
using(Graphics g = Graphics.FromImage(bitmap))
{
g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);
}
// TODO: Save or use in any other way.
}
However, if you want to capture videos, it would be better to use something like this Stack Overflow question.