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Wow nice articles! I might find the answer in one of them. Thanks Paresh for the help! 
Edit: Your right! It must be on a multiple of 4! Nice research on the articles! Thanks a lot for the help!
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Llasus wrote: I'm just wondering why the bitmap won't work on other multiples besides 2 and 4
For bitmap's the pixels that represent one row should be a multiple of four.
Suppose you have a bitmap of bit dept 24 and width 150. In that case the total byte required to represent on row is
( 24/8 )*150 = 450. But this is not divisible by four. In this case you have to add dummy bytes in the end of each row. In the above example the number of dummy bytes will be
int nBytesNeed = 4 - (450%4);// = 2
so append a 2 bytes at the end of each row. Thus for each row the number of bytes will be 452.
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Yupyup! I realized that just earlier. Im gonna do some revisions for my code now for that extra padding needed. Thank you for your help! 
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I wanted to write some code or use a library to take the screen as an array of pixels and to locate a specific pixel by x-y axis of the screen, so for example I am running a program on the side which displays its output as graphics, like a card game, now I want to read the cards, in order to do this I will have to read the pixel at a specific location and see if it matches with a different array to "figure" out which card was displayed, and then have the program take the appropriate action. For example if it is poker and the cards are good to press a button to call/raise instead of folding and vice versa. Basically I need to read the screen, or a window and interpret the visual state.
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Im not sure do you need to GetPixel ?
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Just a suggestion. You can start by studying all about CDC.
CWnd* MyDlg;<br />
CDC* MyDC;<br />
<br />
MyDlg = GetDlgItem(IDC_DISPLAYPANEL);
MyDC = MyDlg->GetDC();
From here by getting the CDC of your dialog, you can obtain it's bitmap by using CreateCompatibleBitmap() and obtain the data you'll need from your Bitmap object. Haven't tried it yet, though I am sure that these are the ones you will be needing for your application. Hope that helps.
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I'm not sure about the above two methods.. And I'm sure they work fine but I think that getting pixel values is quite intensive on the CPU/GPU, especially if you are getting a lot of pixel values at the same time..
--PerspX
"Nowadays, security guys break the Mac every single day. Every single day, they come out with a total exploit, your machine can be taken over totally. I dare anybody to do that once a month on the Windows machine." - Bill Gates
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Yup, I was thinking about the heavy processing that it will require, specially the comparison. But if it is what was required of his application then it will be tough. Maybe he can just do the computation and comparison by using variables inside the program, instead of capturing the image outside.
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Llasus wrote: Yup, I was thinking about the heavy processing that it will require
Yes it would  .. another thing to do would be to inject a DLL into the application and then monitor the messages to and from the window.. With this he could then send messages to the window to do certain tasks (if this is supported), and if, for example, there are custom messages, to get the numbers on certain cards.
Hope this helps!
--PerspX
"Nowadays, security guys break the Mac every single day. Every single day, they come out with a total exploit, your machine can be taken over totally. I dare anybody to do that once a month on the Windows machine." - Bill Gates
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Dear all
i have a issue here, please help me. thanks.Build : warning : failed to (or don't know how to) build 'C:\Documents and Settings\Administrator\Desktop\Particle paper\VC++\facerecognition\ÀûÓÃVFW½øÐÐÊÓƵ²¶×½\VFWImageProcessor.cpp'
Compiling...
VFWImageProcessor.cpp
fatal error C1083: Cannot open source file: 'C:\Documents and Settings\Administrator\Desktop\Particle paper\VC++\facerecognition\ÀûÓÃVFW½øÐÐÊÓƵ²¶×½\VFWImageProcessor.cpp': No such file or directory
Error executing cl.exe.
FaceDetect.exe - 1 error(s), 1 warning(s)
unenglish character in directory above is another language of other country, but i couldn't find in directory. so how i can find it and replace english language. thanks a lot.
Li Zhiyuan
9/07/2007
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Are you sure you have this file?
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Your OS seems to not support the language for the folder containing your files, that's the reason why it can't see the folder in the first place. It is better to just change the folder name to english so that your compiler can see that directory, if it exists. But it might be possible that because your OS doesn't support that language, it can't show it in your PC. Why not just develop and run the code on an OS with the same language as the code your trying to develop, or add the language pack your OS needs to read that directory.
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PLEASE read the forum guidelines. You have been told before not to use message titles like 'need help.' Everyone here needs help. Give your messages titles that are meaningful.
______________________
stuff + cats = awesome
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how do I write to command prompt from a MFC dialog app? How can I get the "cout" object?
Thanks
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Hi,
Description of first LoadKeyboardLayout() parameter:
pwszKLID
[in] Pointer to the buffer that specifies the name of the input locale identifier to load. This name is a string composed of the hexadecimal value of the Language Identifier (low word) and a device identifier (high word). For example, U.S. English has a language identifier of 0x0409, so the primary U.S. English layout is named "00000409". Variants of U.S. English layout (such as the Dvorak layout) are named "00010409", "00020409", and so on.
I can find language identifiers list in registry (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layouts), but where do I find "device identifiers" ??? Because now I'm able to set whatever language with default keyboard, but not specified keyboard( which is exactly what I want ).
thanks
Vilius
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Hello, anytime i try to load a dll on another process (mainly games) i get an error, usually "OpenProcess Failed!" or "Failed to openprocess on ______". This has started to happen only about a month ago. I'm almost positive its something to do with my computer but im not sure what. Any help would be greatly appreciated! thnx
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Have you tried using GetLastError() to get the exact error code?
--PerspX
"Nowadays, security guys break the Mac every single day. Every single day, they come out with a total exploit, your machine can be taken over totally. I dare anybody to do that once a month on the Windows machine." - Bill Gates
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srry im not sure how to do that. i didn't write the program and i have little to no background in this kind of stuff.
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There is always a good time to learn!;P ==> ::GetLastError()
The error codes are defined in the "winerror.h" header file. You can also use the FormatMessage if you want to see a text description of the error.
<br />
std::string strMessage;<br />
<br />
HLOCAL hLocal = 0;<br />
::FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER, 0,(DWORD)::GetLastError(), 0, (char*)&hLocal, 0, 0 );<br />
<br />
strMessage = (char*)LocalLock( hLocal );<br />
LocalFree( hLocal );<br />
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srry for the stupid question but how do i look at the error codes in the "winerror.h" header file? honestly this is all a first time for me, thnx for the help though.
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Jebus89 wrote: srry for the stupid question but how do i look at the error codes in the "winerror.h" header file?
Open the file using the IDE, or some other text editor such as Notepad.
Personally, I find that the simplest method to do this sort of thing is to add:
#include <winerror.h> someplace in the code, right click that statement, and select "Open" from the context menu. That'll save you from having to deal with a bunch of (messy) folder names.
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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If you're using the Visual Studio debugger then just enter "@ERR, hr" in the watch window and let the debugger do all the heavy lifting.
Steve
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If you aren't, then your compiler will have an "include" folder somewhere within it's parent directory.. Look in there.. "winuser.h" may be in another folder called "win" or in this directory.. i.e. it will either be in "[compiler root directory]\include\" or "[compiler root directory]\include\win".. If you still cannot find it, use the Windows search function (Press Windows key+F)
--PerspX
"Nowadays, security guys break the Mac every single day. Every single day, they come out with a total exploit, your machine can be taken over totally. I dare anybody to do that once a month on the Windows machine." - Bill Gates
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