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Code Issues Releases Wiki Activity

Added GetDesktopWindow and GetDC

pull/10/head
David Hall 2018-06-27 13:06:40 -06:00
parent 6a6af71eef
commit fe9fbfca54
1 changed files with 24 additions and 0 deletions
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24
PInvoke/User32.Gdi/WinUser.Gdi.cs
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@ -633,6 +633,30 @@ namespace Vanara.PInvoke
[System.Security.SecurityCritical]
public static extern bool GetClientRect(HandleRef hWnd, [In, Out] ref RECT lpRect);
/// <summary>
/// Retrieves a handle to the desktop window. The desktop window covers the entire screen. The desktop window is the area on top of which other windows
/// are painted.
/// </summary>
/// <returns>The return value is a handle to the desktop window.</returns>
// HWND WINAPI GetDesktopWindow(void);
// https://msdn.microsoft.com/en-us/library/windows/desktop/ms633504(v=vs.85).aspx
[DllImport(Lib.User32, SetLastError = false, ExactSpelling = true)]
[PInvokeData("Winuser.h", MSDNShortId = "ms633504")]
public static extern IntPtr GetDesktopWindow();
/// <summary>
/// The GetDC function retrieves a handle to a device context (DC) for the client area of a specified window or for the entire screen. You can use the
/// returned handle in subsequent GDI functions to draw in the DC. The device context is an opaque data structure, whose values are used internally by GDI.
/// </summary>
/// <param name="ptr">A handle to the window whose DC is to be retrieved. If this value is NULL, GetDC retrieves the DC for the entire screen.</param>
/// <returns>
/// If the function succeeds, the return value is a handle to the DC for the specified window's client area. If the function fails, the return value is NULL.
/// </returns>
// https://msdn.microsoft.com/en-us/library/windows/desktop/dd144871(v=vs.85).aspx
[DllImport(Lib.User32, SetLastError = false, ExactSpelling = true)]
[PInvokeData("Winuser.h", MSDNShortId = "dd144871")]
public static extern IntPtr GetDC(IntPtr ptr);
/// <summary>Retrieves the current color of the specified display element. Display elements are the parts of a window and the display that appear on the system display screen.</summary>
/// <param name="nIndex">The display element whose color is to be retrieved.</param>
/// <returns>The function returns the red, green, blue (RGB) color value of the given element.