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Tip of the Day
Language: Visual Basic
Expertise: Advanced
Nov 18, 1998



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Copy Drawn Picture to Clipboard

The VB Picture control can hold several different formats of pictures: BMP, DIB, ICO, CUR, WMF, and others under VB5. Additionally, you can use graphics methods to "draw" on the control. The only native method that converts the image on the picture control, including the drawn graphics, to a bitmap and transfers the bitmap to the system clipboard requires you to use AutoRedraw.

However, this technique causes problems. This code shows the declarations and functions required to transfer the image on a VB picture control to the system clipboard as a bitmap. Add this code to a BAS module, call PicToClip, and pass the picture box as the only parameter:

'	#
'	# API Declarations
'	#
'	Bitmap
Private Declare Function BitBlt Lib "gdi32" _
	(ByVal hDestDC 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 dwRop As Long) As Long
Private Declare Function _
	CreateCompatibleBitmap Lib "gdi32" (ByVal hDC As Long, _
	ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function CreateCompatibleDC _
	Lib "gdi32" (ByVal hDC As Long) As Long
Private Declare Function DeleteDC Lib _
	"gdi32" (ByVal hDC As Long) As Long
Private Declare Function GetDC Lib "user32" _
	(ByVal hWnd As Long) As Long
Private Declare Function ReleaseDC Lib "user32" _
	(ByVal hWnd As Long, ByVal hDC As Long) As Long
Private Declare Function SelectObject Lib "gdi32" _
	(ByVal hDC As Long, ByVal hObject As Long) As Long
' Clipboard
Private Declare Function OpenClipboard Lib _
	"user32" (ByVal hWnd As Long) As Long
Private Declare Function CloseClipboard Lib _
	"user32" () As Long
Private Declare Function EmptyClipboard Lib _
	"user32" () As Long
Private Declare Function SetClipboardData Lib "user32" _
	(ByVal wFormat As Long, ByVal hMem As Long) As Long
'	#
'	# API Constants
'	#
'	Clipboard formats
Private Const CF_BITMAP = 2
Private Const SRCCOPY = &HCC0020

Public Sub PicToClip(pic As PictureBox)
	Dim hSourceDC As Long
	Dim hMemoryDC As Long
	Dim lWidth As Long
	Dim lHeight As Long
	Dim hBitmap As Long
	Dim hOldBitmap As Long
	'	#
	'	# NOTE: Error trapping has been removed 
	'	for the sake of clarity
	'	#
	With pic
		' Determine bitmap size
		lWidth = .Parent.ScaleX(.ScaleWidth, _
			.ScaleMode, vbPixels)
		lHeight = .Parent.ScaleY(.ScaleHeight, _
			.ScaleMode, vbPixels)

		' Get hBitmap loaded with image on 
		' Picture control
		hSourceDC = GetDC(.hWnd)
		hMemoryDC = CreateCompatibleDC(.hDC)
		hBitmap = CreateCompatibleBitmap( _
			.hDC, lWidth, lHeight)
		hOldBitmap = SelectObject(hMemoryDC, _
		Call BitBlt(hMemoryDC, 0, 0, lWidth, _
			lHeight, pic.hDC, 0, 0, SRCCOPY)
		hBitmap = SelectObject(hMemoryDC, _

		' Copy to clip board
		Call OpenClipboard(.Parent.hWnd)
		Call EmptyClipboard
		Call SetClipboardData(CF_BITMAP, _
		Call CloseClipboard

		' Clean up GDI
		Call ReleaseDC(.hWnd, hSourceDC)
		Call SelectObject(hMemoryDC, hBitmap)
		Call DeleteDC(hMemoryDC)
	End With
End Sub
Tom McCormick
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