David Alm: Automated Syncronization with Documentation

2012-10-18T17:18:59Z

Automated Syncronization with Documentation

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'''Class:''' [[Interface IGDIPlus.IGPGraphics|IGPGraphics]]

== Syntax ==
=== Delphi: ===
<code>
'''function''' ReleaseHDC( hdc : HDC ) : [[Class IGDIPlus.TGPGraphics|TGPGraphics]];
</code>

=== C++ Builder: ===
<code>
[[Class IGDIPlus.TGPGraphics|TGPGraphics]] '''__fastcall''' ReleaseHDC( HDC hdc );
</code>

=== Visual C++ (MFC): ===
<code>
ReleaseHDC( hdc );
</code>

== Summary ==
Releases a device context handle obtained by a previous call to the [[Class IGDIPlus.TGPGraphics|TGPGraphics]].[[Method function IGDIPlus.IGPGraphics.GetHDC() : HDC|GetHDC]] method of this Graphics object.

== Description ==
Call this method to release a device context handle obtained
by a previous call to the [[Class IGDIPlus.TGPGraphics|TGPGraphics]].[[Method function IGDIPlus.IGPGraphics.GetHDC() : HDC|GetHDC]] method of this
Graphics object.

Example:

The following function has a pointer to a Graphics object as
its only parameter. The function calls Graphics::[[Method function IGDIPlus.IGPGraphics.GetHDC() : HDC|GetHDC]] to
get a handle to the device context associated with the
Graphics object and then passes that device context handle to
the Microsoft Windows Graphics Device Interface
(GDI)Rectangle function. The call to ReleaseHDC releases the
device context handle.
<code lang="delphi">
AGraphics->[[Method function IGDIPlus.IGPGraphics.DrawEllipse(IGPPen;TGPRect) : TGPGraphics|DrawEllipse]]( [[Class IGDIPlus.TGPPen|TGPPen]].Create( aclBlue ), 10, 10, 100, 50); // GDI+

AHdc = AGraphics->[[Method function IGDIPlus.IGPGraphics.GetHDC() : HDC|GetHDC]]();

// Make GDI calls, but don't call any methods
// on g until after the call to ReleaseHDC.
Rectangle( AHdc, 120, 10, 220, 60); // GDI

AGraphics->ReleaseHDC(AHdc);

// [[Enum item IGDIPlus.TGPStatus.Ok|Ok]] to call methods on g again.
AGraphics->[[Method function IGDIPlus.IGPGraphics.DrawLine(IGPPen;Integer;Integer;Integer;Integer) : TGPGraphics|DrawLine]]( [[Class IGDIPlus.TGPPen|TGPPen]].Create( aclRed ), 240, 10, 340, 60);

</code>

Method function IGDIPlus.IGPGraphics.ReleaseHDC(HDC) : TGPGraphics - Revision history

David Alm: Automated Syncronization with Documentation