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| Submitted on: |
12/27/2003 6:26:50 PM |
| By: |
SpaceMonkey
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| Level: |
Advanced |
| User Rating: |
By 19 Users |
| Compatibility: |
VB.NET |
| Views: |
29368 |
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ScreenCapture.vb is a .Net class that allows you take a screenshot (printscreen) of the desktop, or part of it, or of the active window, or of any window you got the HWND from.
It doesn't use sendkeys or the clipboard, this is a proper implementation with API.
Basicly the class exists out of two shared functions that are overloaded a bit, give me a vote if you like it.
Usage:
PictureBox1.Image = ScreenCapture.GrabScreen()
PictureBox1.Image = ScreenCapture.GrabActiveWindow()
PictureBox1.Image = ScreenCapture.GrabWindow(SomeHwnd)
PictureBox1.Image = ScreenCapture.GrabScreen(X, Y, Width, Height)
PictureBox1.Image = ScreenCapture.GrabScreen(Rect)
PictureBox1.Image = ScreenCapture.GrabScreen(Location, Size)
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Other 2 submission(s) by this author
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Other User Comments
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 12/28/2003 5:58:16 AM: Pietro ing. Cecchi
all we needed about capture...
I give you 5
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12/30/2003 7:14:19 AM: Sameers (theAngrycodeR)
Hello,
Is there a way to capture a hidden form? nice code BTW.
Sameers
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1/2/2004 9:42:47 PM: Fish123456
This code has a memory leak in it... It's not releasing all the memory it uses after each pass.
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1/3/2004 5:44:44 AM: SpaceMonkey
Fish123456:
There is no memory leak in the code, memory is released, but the Garbage Collector of .Net is just a bit slow to release it.
If the memory usage is a problem you can call "GC.Collect()" to have the Garbage Collector clean up immediately.
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1/4/2004 6:07:25 PM: Fish123456
Ok, you are right space monkey. The memory was released, but only after up to 60 MB's had been used. The GC.collect method works fine, but I do not know the CPU usage overhead.
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1/23/2004 3:40:28 PM:
I really like the idea, it would come in very very handy for something that I am trying to do but on the web using asp.net. I am trying to use it w/ this and I'm just getting a big black box. Is there any way to simulate a printscreen to a web browser?
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1/23/2004 3:41:25 PM:
This is a great idea. Will it work to printscreen on a web browser. I am trying to use it in a asp.net web application and my bitmap is a big black box.
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1/24/2004 4:11:23 AM: SpaceMonkey
When using ASP you are dealing with security settings and limited access to the target system, I don't think you can use an API based solution for this.
Never done ASP myself (yet), can't really help you out on that one.
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2/21/2004 5:35:38 AM:
thats gr8, 5 for you
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2/25/2004 12:07:57 AM:
its good
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5/5/2004 6:36:10 PM: Nelson Lamprecht
I have used this code, by creating a silent app and calling from a webpage using psexec to execute it on a remote webpage and then display the resulting saved imaged in that webpage. Works great for my role in helpdesk...:)
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9/7/2004 5:04:23 PM:
Please email me the code, it isn't available on Planet-Source-Code.
Thanks
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9/8/2004 3:22:22 AM: SpaceMonkey
Use the 'download code' link next to the Winzip icon to download the source code...
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2/10/2005 11:42:37 PM:
hi,
excelent code... but :)
i am using this to take screen caps of active window 5times per sec, to anaylze and interact with another program....
after ~80 minutes every time, it crashes and the interface gets quite screwey, also the line:
hOffscreenDC = CreateCompatibleDC(hWindowDC)
returns 0 to hOffscreenDC every time there after.
any idea why this might happen?
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2/19/2005 5:28:32 AM: SpaceMonkey
5 Times a second is alot, you are probaly running out of virtual memory by the slow garbage collecting by .NET.
Try calling GC.Collect() once in a while to force .NET to collect the freed memory.
Also you might recode the function so that it doesn't create new device contexes all the time. You could create them once at program start en release them at the end of the program, reusing them during runtime.
Make sure you properly release the bitmaps returned by these functions as well.
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4/5/2005 4:56:52 PM:
Trying to use the GrabWindow(somehWnd) which in your code expects an Int32. I realize that the low level Win API uses Int32 for handles, but obtaining a handle from a control in .Net provides a System.IntPtr. What procedure are you recommending to get the Handle as an Integer?
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4/6/2005 2:58:00 AM: SpaceMonkey
On of the member functions of the System.IntPtr class is ToInt32(), which will return the handle as Int32.
So you can use something like MyForm.Handle.ToInt32()
Thanks for the feedback, and remember to vote for the code if you find it useful :o)
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4/6/2005 8:45:01 AM:
Thamks for the rapid response. Your code does seem to work well at what it does. I have seen other code streams that work similarly. The one thing I have been unable to find is a method that will capture a hidden window (one that is not topmost). There was an MSKB article Q194580 that worked for VB, but does not seem effective for .Net.
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9/28/2005 4:51:31 AM: Arvin Meralpis
Is there a pure, manage, dotNet way of doing this?
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9/28/2005 9:54:49 AM: SpaceMonkey
Arvin, no there isn't
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11/5/2005 9:10:19 PM: Indra Kurniawan
awesome, you saved my time. thanks for that.
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2/25/2006 1:41:34 AM: jsa
excellent code,keep it up
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4/11/2006 2:53:33 PM: Spencer Lerch
Great code that saved me a lot of time for a project that is short on time. This will be a huge help with error resolution. Thanks
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7/31/2006 5:42:26 AM: SUN
This is wonderful.
is there any way to capture the screen of another wiondow?
i mean i open anopther website on another browser window and how can i capture only that window?
Thank you
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11/24/2006 4:59:36 PM: Jesse Yeager
Thanks. This helped me a lot, trying to move some VB6 code to .NET. I did it without the SelectObject and compatible DC stuff.
Dim desktopDC As Integer
desktopDC = GetDC(0)
Dim hBitmap As Integer
hBitmap = GetCurrentObject(desktopDC, OBJ_BITMAP)
Dim objBMP As Bitmap
objBMP = Bitmap.FromHbitmap(New IntPtr(hBitmap))
picBox.Image = objBMP
picBox.Refresh()
ReleaseDC(0, desktopDC)
objBMP = Nothing
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8/18/2007 11:31:11 PM: Jose Pablo Islas
Why not just use Graphics.CopyFromScreen
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8/18/2007 11:39:25 PM: Jose Pablo Islas
Public Shared Function GetScreenShot() As Image
Dim screenBounds As Rectangle = Screen.PrimaryScreen.Bounds
Dim theImg As New Bitmap(screenBounds.Width, screenBounds.Height)
Dim g As Graphics = Graphics.FromImage(theImg)
g.CopyFromScreen(0, 0, 0, 0, New Size(screenBounds.Width, screenBounds.Height))
Return theImg
End Function
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