Tim Van Wassenhove home

Last month i’ve started programming with the .NET Framework using Visual Basic, C++.NET and C# on a daily basis. The first thing i noticed is that some useful functions that were available in kernel32.dll, user32.dll, etc. have been removed from the API. At pinvoke.net you find a summary of the functions in these DLLs and the PInvoke signatures.The most common approach is to build classes for the DLLs as following

namespace InterOp {
	public class User32 {
		[DllImport("user32.dll")]
		public static extern IntPtr GetDesktopWindow();
		[DllImport("user32.dll")]
		public static extern IntPtr GetWindowDC(IntPtr hWnd);
		[DllImport("user32.dll")]
		public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);
		[DllImport("user32.dll")]
		public static extern IntPtr GetWindowRect(IntPtr hWnd, RECT rect);
	}

	public class GDI32 {
		[DllImport("gdi32.dll")]
		public static extern bool DeleteDC(IntPtr hDC);
		[DllImport("gdi32.dll")]
		public static extern bool DeleteObject(IntPtr hObject);
		[DllImport("gdi32.dll")]
		public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
	}
}