Seguinte, quero simular a tecla Print Screen, mas só quero capturar uma parte da tela, como posso fazer isto?

Agradeço desde já!

'Para capturar imagem da tela
Private Declare Function GetDC Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function StretchBlt Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal Y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long

Private Sub Command1_Click()
  Dim wScreen As Long
  Dim hScreen As Long
  Dim hdcScreen
  Dim r
 
  wScreen = Screen.Width  Screen.TwipsPerPixelX 'Mudar para o tamanho que vc queira
  hScreen = Screen.Height  Screen.TwipsPerPixelY

  Me.ScaleMode = vbPixels
 
  hdcScreen = GetDC(0)

  r = StretchBlt(Picture1.hdc, 0, 0, wScreen, hScreen, hdcScreen, 0, 0, wScreen, hScreen, vbSrcCopy)
  Picture1.Refresh

End Sub

 

'Utilize o autoredraw = true do picturebox