Solved

Draw on screen like in screen saver

Posted on 1998-11-11
3
175 Views
Last Modified: 2013-11-20
Hello everyone out there in computerland,

I am new to programing and was wondering how I could draw on the screen?  I mean, I want to really draw on the SCREEN like so I can see the for example lines on the desktop.  I am using MFC and Visual C++.

Thank you!
0
Comment
Question by:ADK
  • 2
3 Comments
 
LVL 6

Accepted Solution

by:
thresher_shark earned 220 total points
ID: 1324516
Answer coming...
0
 
LVL 6

Expert Comment

by:thresher_shark
ID: 1324517
To do that, you must first create a window.  You see, the way it works is you take a COPY of the screen and put it in its own window.  Then, you can draw in the window and make it look like you're drawing on the screen.

Here is what you have to do:
- Create your app, using ClassWizard.  Select the dialog based setting.
- Delete all the buttons etc that are in the dialog using the resource editor.
- Change the properties of the dialog window in resource editor so that there is no title bar.

- Add:
   POINT pt;
   GetCursorPos (&pt);
   SendMessage (WM_SYSCOMMAND, SC_MAXIMIZE, pt.y << 16 | pt.x);

   in the "InitDialog" member function.

- Add:
  CPaintDC dc (this); // device context for painting
  CRect rect;
  GetClientRect(rect);

  dc.BitBlt (0, 0, rect.right, rect.bottom,
             GetDesktopWindow ()->GetDC (), 0, 0,
             SRCCOPY);

  to the "else" statement in the OnPaint member function.

At this point, you can draw on the screen using the CDC member functions like LineTo, PolyLine, SetPixel, etc.

If you have any further questions on how to implement this, please feel free to ask.  Thanks!
0
 

Author Comment

by:ADK
ID: 1324518
Good, I think that covers it nicely.  Thank you.
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
ODBC Connection Logging, ADO.NET 6 69
bigDiff challenge 17 126
withoutTen challenge 14 132
Remove Password Protection from pdf (with password) using an command line executable 5 63
Introduction: Load and Save to file, Document-View interaction inside the SDI. Continuing from the second article about sudoku.   Open the project in visual studio. From the class view select CSudokuDoc and double click to open the header …
If you use Adobe Reader X it is possible you can't open OLE PDF documents in the standard. The reason is the 'save box mode' in adobe reader X. Many people think the protected Mode of adobe reader x is only to stop the write access. But this fe…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

821 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question