I am looking for a way of creating a program that will perform a mouse click where it finds a certain color on the screen.
For example if there is a red box on the screen, I would want the program to click on the red box in the center of it.
How could I accomplish this in C#?
As you only wanted a general way, I didn't really make it perfect, but here is the idea:
Have a method for taking a screen shot:
public Bitmap ScreenShot()
{
var screenShot = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
Screen.PrimaryScreen.Bounds.Height,
PixelFormat.Format32bppArgb);
using (var g = Graphics.FromImage(screenShot))
{
g.CopyFromScreen(0, 0, 0, 0, Screen.PrimaryScreen.Bounds.Size);
}
return screenShot;
}
And a method to find a certain color in a bitmap: Note that this implementation can be DRASTICALLY improved using unsafe code and LockBits (read here and here ).
public Point? GetFirstPixel(Bitmap bitmap, Color color)
{
for (var y = 0; y < bitmap.Height; y++)
{
for (var x = 0; x < bitmap.Width; x++)
{
if (bitmap.GetPixel(x, y).Equals(color))
{
return new Point(x, y);
}
}
}
return null;
}
Another method you'll need is one for clicking a certain point:
[DllImport("user32.dll",
CharSet=CharSet.Auto,
CallingConvention=CallingConvention.StdCall)]
private static extern void mouse_event(long dwFlags,
long dx,
long dy,
long cButtons,
long dwExtraInfo);
private const int MOUSEEVENTF_LEFTDOWN = 0x02;
private const int MOUSEEVENTF_LEFTUP = 0x04;
public void Click(Point pt)
{
Cursor.Position = pt;
mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, pt.X, pt.Y, 0, 0);
}
And finally, one to wrap it all up:
public bool ClickOnFirstPixel(Color color)
{
var pt = GetFirstPixel(ScreenShot(), color);
if (pt.HasValue)
{
Click(pt.Value);
}
// return whether found pixel and clicked it
return pt.HasValue;
}
Then, the usage would be:
if (ClickOnFirstPixel(Color.Red))
{
Console.WriteLine("Found a red pixel and clicked it!");
}
else
{
Console.WriteLine("Didn't find a red pixel, didn't click.");
}
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