Question about graphics class in C#

Question

0.00/5 (No votes)

See more:

I Have this code for take screen shot from windows :

C#

Rectangle bounds = Screen.GetBounds(Screen.GetBounds(Point.Empty));
            Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height);
            Graphics g = Graphics.FromImage(bitmap);
            g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);

what does last line actually do ?
if i delete last line the bitmap is black , but the last line does not any work with bitmap !
thanks , Arman

What I have tried:

I've tried this :
TeboScreen: Basic C# Screen Capture Application[^]

Posted 12-Oct-17 22:44pm

Member 10209926

Updated 12-Oct-17 23:06pm

Add a Solution

2 solutions

Solution 2

The line:

C#

g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);

Copies the current screen (or the primary screen if you have more than one) and draws it into teh bitmap: if you add

C#

bitmap.Save(@"D:\Temp\Screen.bmp");

You will be able to see the image clearly.

Point.Empty is just a shorthand for new Point(0, 0) so it copies from the top left of the screen to the top left of the output bitmap, and bounds.Size says to copy the entire screen.

Posted 12-Oct-17 23:06pm

OriginalGriff

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

phil.o · Accepted Answer · 2017-10-12T23:00:00

Solution 1

You can check the documentation:
Graphics.CopyFromScreen Method[^]
There it is stated that it

Quote:
Performs a bit-block transfer of color data from the screen to the drawing surface of the Graphics.

Therefore, the last line actually does something with the bitmap, simply by interfering with its underlying Graphics object.
Kindly.

Posted 12-Oct-17 23:00pm

phil.o

Comments

Member 10209926 13-Oct-17 5:04am

Thanks I've got my answer .

phil.o 13-Oct-17 5:13am

You're welcome :)