[Help] Hooking into a game with a crosshair/setting resolution

I finished a pretty good crosshair application, but I still have 2 issues.

1- I had to make a different program for every resolution. Is it possible for it to adjust to whatever screen resolution is being used? How so?

2- It only works for a few games. I was told that i needed to hook into the functions that whatever game i am trying to hack uses for graphics rendering. Can anyone tell me how I might go about doing this for Combat Arms north america, Wolfteam, F.E.A.R. combat, etc.? Any help is appreciated.


If i can make my application more convenient and functional I will release it to the public. =)

Here is a sample of the source I am currently using (this is for 1920x1200)




#include<windows.h>
#include<iostream>
int main()
{
int x = 960;
int y = 600;
HDC hdc=GetDC(NULL);
while(1)
{
SetPixel(hdc,x,y,255);
SetPixel(hdc,x+1,y,255);
SetPixel(hdc,x-1,y,255);
SetPixel(hdc,x,y+1,255);
SetPixel(hdc,x,y-1,255);
SetPixel(hdc,x+2,y,255);
SetPixel(hdc,x-2,y,255);
SetPixel(hdc,x,y+2,255);
SetPixel(hdc,x,y-2,255);
SetPixel(hdc,x-1,y-1,255);
SetPixel(hdc,x+1,y+1,255);
SetPixel(hdc,x+1,y-1,255);
SetPixel(hdc,x-1,y+1,255);
SetPixel(hdc,x-3,y,255);
SetPixel(hdc,x-2,y,255);
SetPixel(hdc,x-4,y,255);
SetPixel(hdc,x-3,y+1,255);
SetPixel(hdc,x-3,y-1,255);
SetPixel(hdc,x-1,y,255);
SetPixel(hdc,x-5,y,255);
SetPixel(hdc,x-3,y+2,255);
SetPixel(hdc,x-3,y-2,255);
SetPixel(hdc,x-4,y-1,255);
SetPixel(hdc,x-2,y+1,255);
SetPixel(hdc,x-2,y-1,255);
SetPixel(hdc,x-4,y+1,255);
SetPixel(hdc,x+3,y,255);
SetPixel(hdc,x+4,y,255);
SetPixel(hdc,x+2,y,255);
SetPixel(hdc,x+3,y+1,255);
SetPixel(hdc,x+3,y-1,255);
SetPixel(hdc,x+5,y,255);
SetPixel(hdc,x+1,y,255);
SetPixel(hdc,x+3,y+2,255);
SetPixel(hdc,x+3,y-2,255);
SetPixel(hdc,x+2,y-1,255);
SetPixel(hdc,x+4,y+1,255);
SetPixel(hdc,x+4,y-1,255);
SetPixel(hdc,x+2,y+1,255);
SetPixel(hdc,x,y+3,255);
SetPixel(hdc,x+1,y+3,255);
SetPixel(hdc,x-1,y+3,255);
SetPixel(hdc,x,y+4,255);
SetPixel(hdc,x,y+2,255);
SetPixel(hdc,x+2,y+3,255);
SetPixel(hdc,x-2,y+3,255);
SetPixel(hdc,x,y+5,255);
SetPixel(hdc,x,y+1,255);
SetPixel(hdc,x-1,y+2,255);
SetPixel(hdc,x+1,y+4,255);
SetPixel(hdc,x+1,y+2,255);
SetPixel(hdc,x-1,y+4,255);
SetPixel(hdc,x,y-3,255);
SetPixel(hdc,x+1,y-3,255);
SetPixel(hdc,x-1,y-3,255);
SetPixel(hdc,x,y-2,255);
SetPixel(hdc,x,y-4,255);
SetPixel(hdc,x+2,y-3,255);
SetPixel(hdc,x-2,y-3,255);
SetPixel(hdc,x,y-1,255);
SetPixel(hdc,x,y-5,255);
SetPixel(hdc,x-1,y-4,255);
SetPixel(hdc,x+1,y-2,255);
SetPixel(hdc,x+1,y-4,255);
SetPixel(hdc,x-1,y-2,255);
SetPixel(hdc,x+6,y,255);
SetPixel(hdc,x+7,y,255);
SetPixel(hdc,x+5,y,255);
SetPixel(hdc,x+6,y+1,255);
SetPixel(hdc,x+6,y-1,255);
SetPixel(hdc,x+8,y,255);
SetPixel(hdc,x+4,y,255);
SetPixel(hdc,x+6,y+2,255);
SetPixel(hdc,x+6,y-2,255);
SetPixel(hdc,x+5,y-1,255);
SetPixel(hdc,x+7,y+1,255);
SetPixel(hdc,x+7,y-1,255);
SetPixel(hdc,x+5,y+1,255);
SetPixel(hdc,x-6,y,255);
SetPixel(hdc,x-5,y,255);
SetPixel(hdc,x-7,y,255);
SetPixel(hdc,x-6,y+1,255);
SetPixel(hdc,x-6,y-1,255);
SetPixel(hdc,x-4,y,255);
SetPixel(hdc,x-8,y,255);
SetPixel(hdc,x-6,y+2,255);
SetPixel(hdc,x-6,y-2,255);
SetPixel(hdc,x-7,y-1,255);
SetPixel(hdc,x-5,y+1,255);
SetPixel(hdc,x-5,y-1,255);
SetPixel(hdc,x-7,y+1,255);
SetPixel(hdc,x,y+6,255);
SetPixel(hdc,x+1,y+6,255);
SetPixel(hdc,x-1,y+6,255);
SetPixel(hdc,x,y+7,255);
SetPixel(hdc,x,y+5,255);
SetPixel(hdc,x+2,y+6,255);
SetPixel(hdc,x-2,y+6,255);
SetPixel(hdc,x,y+8,255);
SetPixel(hdc,x,y+4,255);
SetPixel(hdc,x-1,y+5,255);
SetPixel(hdc,x+1,y+7,255);
SetPixel(hdc,x+1,y+5,255);
SetPixel(hdc,x-1,y+7,255);
SetPixel(hdc,x,y-6,255);
SetPixel(hdc,x+1,y-6,255);
SetPixel(hdc,x-1,y-6,255);
SetPixel(hdc,x,y-5,255);
SetPixel(hdc,x,y-7,255);
SetPixel(hdc,x+2,y-6,255);
SetPixel(hdc,x-2,y-6,255);
SetPixel(hdc,x,y-4,255);
SetPixel(hdc,x,y-8,255);
SetPixel(hdc,x-1,y-7,255);
SetPixel(hdc,x+1,y-5,255);
SetPixel(hdc,x+1,y-7,255);
SetPixel(hdc,x-1,y-5,255);
Sleep(.1);
}
return 0;
}

I'm not sure I can help you with the resolution portion, but you do indeed need to hook functions if you want to do it for games like CA, where it blocks trying to draw topmost.

I posted something a few days ago, hopefully it could get you started. I suggest doing a little research though.

http://www.mpgh.net/forum/31-c-c/125...3ddevice9.html

For variable screen resolution use: