{"id":363,"date":"2010-07-12T23:35:25","date_gmt":"2010-07-12T21:35:25","guid":{"rendered":"http:\/\/www.albertopasca.it\/whiletrue\/?p=363"},"modified":"2018-05-25T11:26:15","modified_gmt":"2018-05-25T09:26:15","slug":"c-get-pixel-color-at-xy","status":"publish","type":"post","link":"https:\/\/www.albertopasca.it\/whiletrue\/c-get-pixel-color-at-xy\/","title":{"rendered":"[C#] Get Pixel Color At X,Y"},"content":{"rendered":"

Hello,<\/p>\n

a simple trick for you to\u00a0get pixel color\u00a0<\/strong>on a particular position of your screen with Windows\u00a0GDI32.dll<\/strong>\u00a0API libs.<\/p>\n

First of all, you need to import\u00a0Win32 API<\/em>:<\/p>\n

<\/p>\n

[code lang=”csharp” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”][DllImport(\u00a0"user32.dll"\u00a0)]
\nstatic\u00a0extern\u00a0IntPtr GetDC(\u00a0IntPtr hwnd\u00a0);<\/p>\n

[DllImport(\u00a0"user32.dll"\u00a0)]
\nstatic\u00a0extern\u00a0Int32 ReleaseDC(\u00a0IntPtr hwnd, IntPtr hdc\u00a0);<\/p>\n

[DllImport(\u00a0"gdi32.dll"\u00a0)]
\nstatic\u00a0extern\u00a0uint\u00a0GetPixel(\u00a0IntPtr hdc,\u00a0int\u00a0nXPos,\u00a0int\u00a0nYPos\u00a0);[\/code]<\/p>\n

after that, create a function like this that return color in\u00a0ARGB<\/strong><\/a>:<\/p>\n

[code lang=”csharp” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]static\u00a0public\u00a0System.Drawing.Color\u00a0GetPixelColor(\u00a0int\u00a0x,\u00a0int\u00a0y\u00a0)
\n{
\n IntPtr hdc\u00a0=\u00a0GetDC(\u00a0IntPtr.Zero\u00a0);
\n uint\u00a0pixel\u00a0=\u00a0GetPixel(\u00a0hdc, x, y\u00a0);
\n ReleaseDC(\u00a0IntPtr.Zero, hdc\u00a0);
\n Color color\u00a0=\u00a0Color.FromArgb(\u00a0(\u00a0int\u00a0)(\u00a0pixel\u00a0&amp;\u00a00x000000FF\u00a0),
\n (\u00a0int\u00a0)(\u00a0pixel\u00a0&amp;\u00a00x0000FF00\u00a0)\u00a0&gt;&gt;\u00a08,
\n (\u00a0int\u00a0)(\u00a0pixel\u00a0&amp;\u00a00x00FF0000\u00a0)\u00a0&gt;&gt;\u00a016\u00a0);
\n return\u00a0color;
\n}[\/code]<\/p>\n

you can call it simply\u00a0GetPixelColor( 0, 100 );<\/strong><\/p>\n

That\u2019s all.<\/p>\n

Rif:\u00a0albertopasca.it<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Hello, a simple trick for you to\u00a0get pixel color\u00a0on a particular position of your screen with Windows\u00a0GDI32.dll\u00a0API libs. 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