C#

// declaration
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
static extern IntPtr SendMessage(IntPtr hWnd, Int32 Msg, IntPtr wParam, StringBuilder lParam);

const Int32 WM_GETTEXT = 0xD;

// getting the text
StringBuilder sb = new StringBuilder(256);
SendMessage(hWnd, WM_GETTEXT, (IntPtr)256, sb);

Member 1033907 wrote:

If so, how do I make them as regular (global) functions, without being nested in some namespace and class?

namespace Space
{
  public class Something
  {
    public static void FunctionA()
    {
      // do something
    }
  }
}

Member 1033907 wrote:

Can this FunctionA be somehow accessed from an unmanaged C++ win32 application? (no fancy com, mfc, nothing).

Member 1033907 wrote:

Or another way to make it work with just the C++ app and the C# dll? (I have access to both)