Icon.FromHandle(IntPtr) メソッド

定義

アイコン (Icon) を識別する指定の Windows ハンドルから GDI+ HICON を作成します。Creates a GDI+ Icon from the specified Windows handle to an icon (HICON).

public:
 static System::Drawing::Icon ^ FromHandle(IntPtr handle);
public static System.Drawing.Icon FromHandle (IntPtr handle);
static member FromHandle : nativeint -> System.Drawing.Icon
Public Shared Function FromHandle (handle As IntPtr) As Icon

パラメーター

handle
IntPtr

アイコンを識別する Windows ハンドル。A Windows handle to an icon.

戻り値

このメソッドが作成する IconThe Icon this method creates.

次のコード例は、Windows フォームで使用するように設計されています。また、Paint イベントハンドラーのパラメーターである PaintEventArgseが必要です。The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. コードは、次のアクションを実行します。The code performs the following actions:

  • Bitmap を作成します。Creates a Bitmap.

  • そのオブジェクトを画面に描画します。Draws that object to the screen.

  • Bitmapのアイコンハンドルを取得します。Gets an icon handle for the Bitmap.

  • フォームの Form.Icon 属性を、ハンドルから作成されたアイコンに設定します。Sets the Form.Icon attribute of the form to an icon created from the handle.

  • Windows API 関数 DestroyIcon を呼び出してリソースを解放します。Calls the Windows API function DestroyIcon to release resources.

private:
   [System::Runtime::InteropServices::DllImportAttribute("user32.dll",CharSet=CharSet::Auto)]
   static bool DestroyIcon( IntPtr handle );

private:
   [SecurityPermission(SecurityAction::Demand, Flags=SecurityPermissionFlag::UnmanagedCode)]
   void GetHicon_Example( PaintEventArgs^ e )
   {
      
      // Create a Bitmap object from an image file.
      Bitmap^ myBitmap = gcnew Bitmap( "c:\\FakePhoto.jpg" );
      
      // Draw myBitmap to the screen.
      e->Graphics->DrawImage( myBitmap, 0, 0 );
      
      // Get an Hicon for myBitmap.
      IntPtr Hicon = myBitmap->GetHicon();
      
      // Create a new icon from the handle. 
      System::Drawing::Icon^ newIcon = ::Icon::FromHandle( Hicon );
      
      // Set the form Icon attribute to the new icon.
      this->Icon = newIcon;
      
      // You can now destroy the Icon, since the form creates
      // its own copy of the icon accesible through the Form.Icon property.
      DestroyIcon( newIcon->Handle );
   }

[System.Runtime.InteropServices.DllImport("user32.dll", CharSet = CharSet.Auto)]
extern static bool DestroyIcon(IntPtr handle);

private void GetHicon_Example(PaintEventArgs e)
{

    // Create a Bitmap object from an image file.
    Bitmap myBitmap = new Bitmap(@"c:\FakePhoto.jpg");

    // Draw myBitmap to the screen.
    e.Graphics.DrawImage(myBitmap, 0, 0);

    // Get an Hicon for myBitmap.
    IntPtr Hicon = myBitmap.GetHicon();

    // Create a new icon from the handle. 
    Icon newIcon = Icon.FromHandle(Hicon);

    // Set the form Icon attribute to the new icon.
    this.Icon = newIcon;

    // You can now destroy the icon, since the form creates
    // its own copy of the icon accessible through the Form.Icon property.
    DestroyIcon(newIcon.Handle);
}
<System.Runtime.InteropServices.DllImportAttribute("user32.dll")> _
    Private Shared Function DestroyIcon(ByVal handle _ 
    As IntPtr) As Boolean 
    End Function

   Private Sub GetHicon_Example(ByVal e As PaintEventArgs)

        ' Create a Bitmap object from an image file.
        Dim myBitmap As New Bitmap("c:\FakePhoto.jpg")

        ' Draw myBitmap to the screen.
        e.Graphics.DrawImage(myBitmap, 0, 0)

        ' Get an Hicon for myBitmap.
        Dim HIcon As IntPtr = myBitmap.GetHicon()
    
        ' Create a new icon from the handle.
        Dim newIcon As Icon = System.Drawing.Icon.FromHandle(HIcon)

        ' Set the form Icon attribute to the new icon.
        Me.Icon = newIcon

        ' You can now destroy the icon, since the form creates its 
        ' own copy of the icon accessible through the Form.Icon property.
    DestroyIcon(newIcon.Handle)
    End Sub

注釈

このメソッドを使用する場合は、Windows API の DestroyIcon メソッドを使用して元のアイコンを破棄し、リソースが確実に解放されるようにする必要があります。When using this method, you must dispose of the original icon by using the DestroyIcon method in the Windows API to ensure that the resources are released.

セキュリティ

SecurityPermission
アンマネージコードへのアクセスに使用します。for access to unmanaged code. 関連する列挙 UnmanagedCodeRelated enumeration UnmanagedCode.

適用対象