How do I access the pixels on the screen to read them?

[sbscb]

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.

[Hamid Taebi]

Im not sure do you need to GetPixel ?

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WhiteSky

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[Llasus]

Just a suggestion. You can start by studying all about CDC. CWnd* MyDlg; CDC* MyDC; MyDlg = GetDlgItem(IDC_DISPLAYPANEL); //get the CDC of the display panel(ex. picture box) 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.

[Perspx]

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

[Llasus]

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. :)

[Perspx]

Llasus wrote:

Yup, I was thinking about the heavy processing that it will require

Yes it would :sigh:.. 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