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Can't identify pixel color over a live image wicked_guy19-Jul-05 23:05 wicked_guy 19-Jul-05 23:05  Hello Programmers, I am having a program that aquires live video signals and displays them on a picture holder. I am trying to identify the pixel color as the user clicks on the video screen. The program gave me an RGB number but obviously not correct. The following is the program on an MFC dialog based application. void CIdsSimpleLiveDlg::OnLButtonDown(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default CString hi; int ali; CWnd *pDesktop = GetDlgItem(IDC_DISPLAY); CDC *pDC = pDesktop->GetWindowDC(); COLORREF clr = pDC->GetPixel(point.x,point.y); ali = (GetRValue(clr)+GetGValue(clr)+GetBValue(clr))/3; hi.Format("%d",ali); AfxMessageBox(hi); pDesktop->ReleaseDC(pDC); CDialog::OnLButtonDown(nFlags, point); } Note that the notation 'IDC_DISPLAY' represents the ID of the picture holder. Thanks in advance Re: Can't identify pixel color over a live image Chris Losinger20-Jul-05 4:42 Chris Losinger 20-Jul-05 4:42  how are you displaying the video images? Cleek | Image Toolkits | Thumbnail maker Re: Can't identify pixel color over a live image Anonymous20-Jul-05 7:32 Anonymous 20-Jul-05 7:32  yes I am displaying the video and at the same time trying to process the pixels. The problem is that the program doesn't seem to be responding as it does with still images. how to get control of keyboard and mouse? ThinkingPrometheus19-Jul-05 22:57 ThinkingPrometheus 19-Jul-05 22:57  hiho@ll i just need to sniffer what the user enters and the exact mouse events the user makes (mouse click (which button), mouse moves) and i need to send such events to the OS (windows) the problem: 1. i really have no idea how this could work 2. how can i send such events to the OS on an independent way this means, i just don't know which window is focused (which application gets the events) and that's also what i want! i want to send these events to the OS which processes it for the right application! i don't want to know which app is focused because it's not necessary for what i need to do! (well, later maybe it will be necessary but that's another topic/post) thx@ll Re: how to get control of keyboard and mouse? RicoH20-Jul-05 0:27 RicoH 20-Jul-05 0:27  Hi, to log the users keyboard and mouse activity you'll have to take a look at the 'SetWindowsHookEx' function. This allows you to set system-wide keyboard and mouse hooks which will receive all keyboard and mouse activity. Once you have captured the events you can make use of the 'SendInput' function to send the events to the OS which will handle them as if you were really typing or moving the mouse... Don't think you are, know you are... Re: how to get control of keyboard and mouse? vishalmore20-Jul-05 0:52 vishalmore 20-Jul-05 0:52  Global hook is the solution to your problem, but hooks are not stable and are specifically used for debugging purposes. While implementing the global hooks be curious O.W it would screw entire system. Have a look at the API's SetWindowsHookEx, UnhookWindowsHookEx etc... You can get tons of information about hooks on codeproject and online MSDN. All the best ! Cheers, Vishal Re: how to get control of keyboard and mouse? ThinkingPrometheus20-Jul-05 21:30 ThinkingPrometheus 20-Jul-05 21:30  i'll have a look thx! _DEBUG definition caykahve19-Jul-05 22:07 caykahve 19-Jul-05 22:07  Hi, I want to disable some functions in the release build. This is the fucntion: void func1(...) { #ifdef _DEBUG func2(); #endif //_DEBUG } I still see the outputs of func2() in the release build. My preprocessor definitions for the release build: WIN32;_CONSOLE;NDEBUG debug build: WIN32;_CONSOLE;_DEBUG I don't understand what is wrong. How can i solve the problem? Any help appreciated. Thanks in advance Re: _DEBUG definition toxcct19-Jul-05 22:27 toxcct 19-Jul-05 22:27  caykahve wrote: I still see the outputs of func2() in the release build. i don't understand well. does func2() execute ? what happens when you explicitely write a #undef _DEBUG (at the begining of stdafx.h for example) ? TOXCCT >>> GEII power [toxcct][VisualCalc] Re: _DEBUG definition caykahve19-Jul-05 22:46 caykahve 19-Jul-05 22:46  Yes func2() executes. I wrote #undef _DEBUG in stdafx.h and it still executes. Re: _DEBUG definition toxcct19-Jul-05 22:55 toxcct 19-Jul-05 22:55  did you try rebuilding the whole project ? TOXCCT >>> GEII power [toxcct][VisualCalc] Re: _DEBUG definition caykahve19-Jul-05 22:59 caykahve 19-Jul-05 22:59  I always choose "Rebuild Solution" from build menu. i am using Visual Studio .net 2003 BTW. Re: _DEBUG definition toxcct20-Jul-05 0:03 toxcct 20-Jul-05 0:03  what about using DEBUG instead ? TOXCCT >>> GEII power [toxcct][VisualCalc] Re: _DEBUG definition caykahve20-Jul-05 0:29 caykahve 20-Jul-05 0:29  doesn't work Re: _DEBUG definition David Crow20-Jul-05 2:55 David Crow 20-Jul-05 2:55  Use the /P compiler switch on this file. It will preprocess the file into a file with a .i extension. Open that file and look for func1(). That will let you know if _DEBUG is being seen by the preprocessor or not. "Ideas are a dime a dozen. People who put them into action are priceless." - Unknown Re: _DEBUG definition Bob Stanneveld20-Jul-05 5:37 Bob Stanneveld 20-Jul-05 5:37  It's hard to believe that your function gets executed. Maybe you call func2 somewhere else? Try using the debugger and set a breakpoint in func2. Then see the callstack for the caller. Behind every great black man...             ... is the police. - Conspiracy brother Blog[^] Copy a window Halawlaws19-Jul-05 22:00 Halawlaws 19-Jul-05 22:00  How can i at runtime copy a window (Cwnd object) and place it in another position? /\|-||\/|/\|) Re: Copy a window toxcct19-Jul-05 22:29 toxcct 19-Jul-05 22:29  what do you want exactly ? move a window ? or copy it (i never heard of this before)... TOXCCT >>> GEII power [toxcct][VisualCalc] Re: Copy a window Halawlaws19-Jul-05 23:59 Halawlaws 19-Jul-05 23:59  i want to move the one i copied /\|-||\/|/\|) Re: Copy a window toxcct20-Jul-05 0:06 toxcct 20-Jul-05 0:06  use SetWindowPos() to move a window. for copying a window, i really doubt you can do this... TOXCCT >>> GEII power [toxcct][VisualCalc] Re: Copy a window Halawlaws20-Jul-05 1:15 Halawlaws 20-Jul-05 1:15  k thx anyway /\|-||\/|/\|) Re: Copy a window BlackDice20-Jul-05 2:47 BlackDice 20-Jul-05 2:47  It woudln't really be copying, per se, but couldn't you just get all the window styles and attributes from the first window and create a new window with all the same attributes? Or just make a class derived from the one you wanna copy and make a copy constructor that does all this work for you? My articles www.stillwaterexpress.com BlackDice Re: Copy a window toxcct20-Jul-05 3:32 toxcct 20-Jul-05 3:32  all depends if we talk about run time or design time... i think he was thinking when the program was running... TOXCCT >>> GEII power [toxcct][VisualCalc] Wait Real time Halawlaws19-Jul-05 21:28 Halawlaws 19-Jul-05 21:28  How can i wait for 1 seconds in my program before continuing executing the code? What function ca i use? /\|-||\/|/\|) Re: Wait Real time khan++19-Jul-05 21:36 khan++ 19-Jul-05 21:36  1- Sleep(). 2- HANDLE hEvent; hEvent = CreateEvent(NULL,FALSE,FALSE,NULL); WaitForSingleObject(hEvent,1000); CloseHandle(hEvent); this is this.

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