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ImageEnView1.IO.CaptureFromScreen

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T O P I C R E V I E W
w2m	Posted - Aug 27 2012 : 13:32:46 Before calling ImageEnView1.IO.CaptureFromScreen(iecsForegroundWindow) is there any API to determine if there is a foreground window? A question posted at StackOverflow failed to produce any code that works. I created a work-around for the problem that seems to work, but some windows API would be better. If you call ImageEnView1.IO.CaptureFromScreen(iecsForegroundWindow) and there is no foreground window a large completely black bitmap is returned. The work-around uses imageen to determine if the dominantcolor of the capturedimage is 100%. If the dominantcolor is 100 then you can display an error message and blank the image. iPercentage := ImageEnView1.Proc.GetDominantColor(iColor); //the image is all one color! if iPercentage = 100 then begin ImageEnView1.Blank; MessageBox(0, 'There is no foreground window.' + #10#13 + 'Make a window the foreground window, then try again.', 'No Active Window', MB_ICONWARNING or MB_OK); end; It is also interesting that if there is no foreground window, the ImageEnView1.IO.CaptureFromScreen(iecsForegroundWindowClient) returns a bitmap of the start button on the taskbar. William Miller Adirondack Software & Graphics Email: w2m@frontiernet.net EBook: http://www.imageen.com/ebook/ Apprehend: http://www.frontiernet.net/~w2m/index.html
7 L A T E S T R E P L I E S (Newest First)
fab	Posted - Sep 05 2012 : 10:12:41 To what window GetForegroundWindow refers returning 263058? Is that "minimized"? In this case you could check the window status (minimized, hided, etc...).
w2m	Posted - Sep 04 2012 : 11:24:59 Hi Fabrizio, With Windows 7, GetForegroundWindow = 263058 and GetShellWindow = 65866 when there are no visible windows on the deskup... so the test fails. I think you have to click on the desktop for this to work, but when capturing a clientwindow with ImageEnView1.IO.CaptureFromScreen(iecsForegroundWindow) there is no API to force a mouseclick on the desktop is there? William Miller Adirondack Software & Graphics Email: w2m@frontiernet.net EBook: http://www.imageen.com/ebook/ Apprehend: http://www.frontiernet.net/~w2m/index.html
fab	Posted - Sep 03 2012 : 13:39:52 Hi Bill, I don't know if this helps. When there isn't a foreground window then GetForegroundWindow should return the same value of GetShellWindow, so you could try: if GetForegroundWindow() = GetShellWindow() then ...there is no foreground....
w2m	Posted - Aug 31 2012 : 14:13:05 Uwe, I am not sure if this will help because I think you have to click on the window to get the correct foreground window.... will investigate this more. William Miller
Uwe	Posted - Aug 31 2012 : 10:23:42 William, does this help? http://msdn.microsoft.com/en-us/library/windows/desktop/ms633505%28v=vs.85%29.aspx http://msdn.microsoft.com/en-us/library/windows/desktop/ms632599%28v=vs.85%29.aspx#foreground Quote: "To check if your application window is the foreground window, compare the handle returned by GetForegroundWindow to that of your application window." Uwe
ehkhalid	Posted - Aug 31 2012 : 00:23:10 I use another way to detect if a page is blank, I calculcate "standard deviation" it give you if pixels variation is uniform or not, so if it's uniform, it mean image's pixels has the same color. Hope this help
w2m	Posted - Aug 30 2012 : 08:29:25 No one has any ideas? William Miller