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static extern IntPtr CreateDC(string lpszDriver, string lpszDevice,

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public Function CreateDC(<MarshalAs(UnmanagedType.LPStr)>lpszDriver As String, _

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Declare Function CreateDC Lib "gdi32.dll" ( _

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        hdc = CreateDC("DISPLAY", null, null, IntPtr.Zero); // create a new dc,yeni bir dc yaratıyoruz.Yeni bir system dc si yaratıyoruz.

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    [DllImport("gdi32.dll", EntryPoint = "CreateDC", CharSet = CharSet.Auto, SetLastError = true)]

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    private static extern IntPtr CreateDC(string lpszDriver, string lpszDeviceName, string lpszOutput, IntPtr devMode);

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Documentation

[CreateDC] on MSDN

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                hDC =CreateDC(null,printername,0,IntPtr.Zero);

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    static extern IntPtr CreateDC(string strDriver,

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    IntPtr hdcScreen = CreateDC("Display", null, null, IntPtr.Zero);