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| Submitted on: |
6/5/2002 6:16:56 AM |
| By: |
Masoud (M.D)
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| Level: |
Intermediate |
| User Rating: |
By 15 Users |
| Compatibility: |
VB.NET |
| Views: |
82600 |
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(About the author) |
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This code can make a picture from Screen. (API)
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Other 3 submission(s) by this author
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Other User Comments
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 7/1/2002 3:08:37 AM: Bug bitch
Good code. Only very little mistake... Const SRCCOPY is not used... the numeric equivalent is. No big deal. I rated a 5 anyway. Keep sharing with us more code. Thanks
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7/1/2002 5:08:18 AM: Masoud (M.D)
Thank you for your registration.
There isn't SRCCOPY in .NET or i don't know.
anyway thank you.
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9/29/2002 6:53:08 PM:
Any way to make this work in c#.net?
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10/31/2002 7:04:39 AM: Zoltan Kasnya
The code is nice...
It's very clear and tight.
Keep up.
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10/31/2002 1:51:49 PM: Masoud (M.D)
Thanks a lot for your attention and support.
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11/10/2002 5:30:12 PM:
+5 for newbie help that will be used by many!
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11/25/2002 8:15:36 AM: Dave Andrews
5/5 from me. I am surprised that this can't be done without API calls. Great job.
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12/3/2002 1:46:42 AM: Masoud (M.D)
Thanks a lot for your attention.
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2/28/2003 9:37:08 AM: Tropical Wire
Hey, ure code is good. But you can use the sendkeys
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3/10/2003 8:50:16 AM: Masoud (M.D)
Thanks a lot for your supporting.
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6/7/2003 9:46:06 PM:
Hi, found one problem with the code. This code will not capture a form that has an opacity of anything other than 100%. Even if it has 100% opacity then it gets changed.
what i'm trying to is trying to load a form without it flickering as follows:
me.opacity = 0
me.show
application.doevents()
me.opacity = 100
once i try running the screen capture code after this, it does not capture my actual screen. It seems to capture what is behind it (folders, desktop, etc).
Once i comment out the line me.opacity = 0, the capture works perfectly.
I do need to have that line to stop my program from flickering when it loads.
Any suggestions?
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6/10/2003 3:45:24 PM: Masoud (M.D)
I've sent the answer for you dearest.
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6/10/2003 6:41:18 PM:
This is another method which captures screen shots. It works well. Need any info, let me know.
Cheers
Jason
Public Function GetScreenCapture( _
Optional ByVal FullScreen As Boolean = False) As Bitmap
' Captures the current screen and returns as an Image
' object
Dim objSK As SendKeys
Dim imgCapture As Image
If FullScreen = True Then
' Print Screen pressed twice here as some systems
' grab active window "accidentally" on first run
objSK.SendWait("{PRTSC 2}")
Else
objSK.SendWait("%{PRTSC}")
End If
Dim objData As IDataObject = Clipboard.GetDataObject()
Return objData.GetData(DataFormats.Bitmap)
End Function
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6/10/2003 6:42:37 PM:
Sorry about the formatting above. If you cant get it to work, email me.
Cheers
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10/14/2003 9:04:19 PM: Jon Davis
Converted this to C#: http://www.planetsourcecode.com/vb/scripts/ShowCode.asp?txtCodeId=1663&lngWId=10
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11/3/2003 6:22:14 PM:
Memory Leek?
If you run the code and hit the capture button, approximatly 3K of memory is stolen each time. Memory seems to be stolen in the "Image.FromHbitmap" statement. Is there a memory hole in this method? I cant seem to find a way around this memory leek. Any ideas?
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11/3/2003 6:42:57 PM:
gc.Collect seems to fix my memory leek. I can seem to figure out why it was a problem in the first place. Silly Garbage Collection!
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12/4/2003 11:57:34 AM:
hi, I've try your capture screen code and I see that first the capturing the mouse pointer was hide and show then.
There is a function that non hide the pointer during the capture.
Thanks
Sandro
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12/11/2003 2:34:56 PM:
First off- code works great and is much faster than using a print screen to capture and copy to the clipboard. However, I also am experiencing a memory leak- mine is 3MB each time the screenshot runs. I've tried using the gc.collect(), but my code bombs out when I do (some kind of null pointer exception or something). It still bombs out after a long period of running without gc.collect(), but I'm guessing its due to the memory leak (in my tests, I'm taking quite a few screenshots).
Any suggestions?
Thanks again.
Tony
When I finish I'll probably upload what I have for anyone that's interested. Its a very thorough and complete monitoring solution which can be used or modified in many ways.
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12/19/2003 6:12:26 AM:
Do you have any idea about how to use mouse pointer to capture a portion of the window or screen. Currntly it is capturing whole desktop area.
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3/20/2004 2:45:00 AM:
Nice code. But one hitch. If I use this in a VB.Net Service project to capture the screen at regular interval, BitBlt function fails with error 6. Any clues.
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5/7/2004 5:44:35 AM:
that work with the exec("...HQScreen.exe....")
but apache have to be started not as service
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7/4/2004 9:19:30 PM: mrchan
use getcursorpos() api to get cursor api and bitblt with the positions. this is cool code man.
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8/2/2004 4:21:25 AM:
Hi All,
The screen capture code works fine for stand-alone applications. But if you try to run it from a service, it will show a black square instead of a screenshot. Sometimes changing display mode solves the problem. Does anybody know why that happens and how to fix that?
Best regards
MK
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10/7/2004 5:20:17 AM: Nabil Bou Diab
Very neat very cool code ... i'll give you another 5
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10/7/2004 9:17:30 AM: Masoud (M.D)
That's kind of all of you that download this code and even use it.
I'm really happy that this code could help some of you.
Thanks a million.
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11/25/2004 6:06:18 AM:
Well, the code was good as long as I ran it on my desktop. I ran it on another desktop and then closed the rdesktop connection, letting the program run. All I got was black screens
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11/25/2004 6:07:41 AM:
Screen capture or window capture works fine if I run it on my desktop. However if I lock my screen and let the program run, everything is black. Same if I run it on a rdesktop and minimize the rdesktop window. Any way to get around these ?
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11/25/2004 10:42:14 AM: Masoud (M.D)
You should use remoting and send your pictures in bytes from server to the client. In this way you have to draw mouse pointer on your own. Drawing mouse pointer is very easy.
Thank you.
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11/26/2004 5:42:35 AM:
I dont have a server or a client system, I just need to record whatever is going on in a window onto an avi file so I send successive bmp captures into an avi file. The problem is, if that window is not shown, or it is overlapped by another one, or is simply not visible because the screen is locked, this method of capture is not working. I'd really appreciate if you could suggest us a work-around wherein, given a window handle, I can grab the screenshot irrespective of whether that window is visible or not. Thanks
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11/26/2004 9:45:58 AM: Masoud (M.D)
You can use another APIs to see whether that window is visible or not or to see that window is minimize or not. I think searching for these kind of APIs will help you.
Thank you.
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12/23/2004 8:07:44 PM: SAndrewH
Anyone have fix for the memory leak, yet?
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2/16/2005 5:25:51 PM:
First off, awesome code for a stand alone app. I'm rating it 5 stars, if for nothing else but as a great learning tool.
That said, I'm also having the problem with capturing only a black image if I try to run this in the code behind of an asp.net web page (or from directly on the page, for that matter). It doesn't matter what image format I choose, either.
From what I've seen in searching other locations on the net, this seems to be a common problem. Has anyone found or developed a good workaround/solution for this?
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2/24/2006 10:54:01 AM: jsa
hi can any 1 suggest method to avoid memory leak(its approx 3MB of memory)every time i click on capture button
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8/1/2006 4:24:14 PM: Rohit
VB 2005 has an even easier way to do this
bmpScreenshot = New Bitmap(Screen.PrimaryScreen.Bounds..Width, Screen.PrimaryScreen.Bounds..Height, PixelFormat.Format32bppArgb)
' Create a graphics object from the bitmap
gfxScreenshot = Graphics.FromImage(bmpScreenshot)
' Take the screenshot from the upper left corner to the right bottom corner
gfxScreenshot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy)
' Save the screenshot to the specified path that the user has chosen
bmpScreenshot.Save("c:\test.png", ImageFormat.Png)
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8/5/2006 5:02:55 AM: Masoud (M.D)
Yes, this is added to .NET Framework 2 and is really easy but we had not it in .NET Framework 1.
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10/17/2006 9:38:54 AM: nsrijo
That said, I'm also having the problem with capturing only a black image if I try to run this in the code behind of an asp.net web page (or from directly on the page, for that matter). It doesn't matter what image format I choose, either.
From what I've seen in searching other locations on the net, this seems to be a common problem. Has anyone found or developed a good workaround/solution for this?
How Can i solve this problem. I want Screen shot capture in asp.net (web Application)
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12/8/2006 12:13:04 PM: Shyam
Hi
I have an application which lists all the active applications in a combo box and lets the user select an application. I am trying to get the handle to this selected application and calling the CaptureWindowToFile function and trying to save it as a bmp. Unfortunately I am unable to get the screen shot of my selected application.
Any help in this regard will be greatly appreciated.
I am using Microsoft Dev Environment 2003, ver 7.1.3088 and .NET framework 1.1
Thanks in Advance,
Shyam
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