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Trigger Pixel Change on Screen and do something

Posted on 2009-04-06
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Last Modified: 2013-12-17
Hi @ all

GetColor allows me to retrieve the color of any pixel on the screen

Now i attempt to solve out how to trigger an action whenever the pixel color of X,Y-coordinates anywhere on screen changes. This should stop the methode RunApp() and start again.

Thanks in advance!
public Color GetColor(int x, int y)
{
	Bitmap b = new Bitmap(1, 1);
	Graphics g = Graphics.FromImage(b);
	g.CopyFromScreen(x, y, 0, 0, b.Size);
	g.Dispose();
	Color c = b.GetPixel(0, 0);
	b.Dispose();
 
	return c;
}
public void RunApp()
{	
	if (comboBoxPlatzAmTisch.Text == "")
	{
			MessageBox.Show("Geben Sie Ihren Platz am Tisch an!");
	}
	else
	{
		Color sResult = GetColor(iKartenPositionen[i, 0], iKartenPositionen[i, 1]);
		sResult = KarteVorhanden();
		if (sResult == true)	
		{
			ScreenshotSpieler(iSpielerPlatz);			
			bool fAktiv = GetPixelColor();
			if (fAktiv == true){
				//here follows more nested if statements}
		}
		else
		{
			Pockal.Clear();
			Tisch.Clear();
			Gegner.SelectedIndex = 0;
		}
	}	
}

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Question by:pekabo
1 Comment
 
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Accepted Solution

by:
pekabo earned 0 total points
ID: 24106342
Unfortunately, no answer.
A solution for my problem could looks like this (it works for me)

i use backgroundWorker (DoWork, RunWorkerCompleted, ProgressChanged)
i made a do while loop if the color of the pixel like the color in Color it returns a true
this will stop the Loop. Now i can ask is backgroundPL1.IsBusy = true, NO Pixel Changed
if backgroundPL1.IsBusy = false the color of the pixel Cahnged

see Code Snippet below.

p.s.: please refund the points, i wont´t delete this message, because other could maybe learn from it
private void backgroundPL1_DoWork(object sender, DoWorkEventArgs e, Color ColorName)
{
int i = 1;
 
	if ((workerPL8.CancellationPending == true))
	{		
		return;
	}
	else
	{
		bool a = false;
		do
		{
			Bitmap b = new Bitmap(1, 1);
			Graphics g = Graphics.FromImage(b);
			g.CopyFromScreen(x, y, 0, 0, b.Size);
			g.Dispose();
			Color c = b.GetPixel(0, 0);
			b.Dispose();
			if (c.Name != ColorName) a = true;
			if (i > 100) i = 1;
			
			workerPL8.ReportProgress(i);			
					
			Thread.Sleep(1);
			//Keep UI messages moving, so the form remains 
                        //responsive during the asynchronous operation.	
			Application.DoEvents();
			
			i++;
		} while (a == false);
	}
}

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