C++ Help

[Codebyte]

Alright so here it goes... I've been experimenting with creating macros based on pixel color changes... I'm not understanding why GetPixel() is returning 0 constantly when I have the target game open... I can see the cursor coordinates, but not the color value... What am I doing wrong? I need to find the color of the pixel underneath the cursor while in a full screen game window.

Here is my example I wrote in a couple minutes to output coordinates and color:

Code: C [Select]

1. //------------------------------------------------------------------------------
2. #include <windows.h>
3. #include <iostream>
4. //------------------------------------------------------------------------------
5. using namespace std;
6. //------------------------------------------------------------------------------
7. int main(void)
8. {
9.         HWND wowHandle = FindWindow(NULL, "World of Warcraft");
10.         if(!wowHandle)
11.         {
12.                 cout << "WoW is not open atm..." << endl;
13.                 system("pause");
14.                 return 0;
15.         }
16.         else
17.         {
18.                 cout << "WoW is OPEN..." << endl;
19.                 ShowWindow(wowHandle, SW_SHOWNORMAL);
20.                 SetForegroundWindow(wowHandle);
21.                
22.                 while(1)
23.                 {
24.                         POINT cursorPoint;
25.                         GetCursorPos(&cursorPoint);
26.                         COLORREF color = GetPixel(GetDC(wowHandle), cursorPoint.x, cursorPoint.y);
27.                         system("cls");
28.                         cout << "(" << cursorPoint.x << ", " << cursorPoint.y << ")" << endl;
29.                         cout << "COLOR: " << color;
30.                 }      
31.         }
32.        
33. }
34. //------------------------------------------------------------------------------

it's probably sloppy... don't hate on the 5 minute "im at work and in a hurry on my break" coding...

[Codebyte]

nevermind... after doing some research I figured out that gameguard blocks the API calls and filters what is returned... this would make sense as to why its returning 0 for a color call...

[f0dder]

nevermind... after doing some research I figured out that gameguard blocks the API calls and filters what is returned... this would make sense as to why its returning 0 for a color call...

-Codebyte (February 12, 2010, 08:53 PM)

I'd be a bit surprised if GetPixel worked, GameGuard/whatever or not, as soon as you're dealing with Direct3D (and possibly even DirectDraw) accelerated games.