LoadImage PNG in excel vba form image1.picture control, black background - image

Question

I have code which load png images to picture control
Option Explicit
Option Private Module
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(0 To 7) As Byte
End Type
Private Type PICTDESC
Size As Long
Type As Long
hPic As Long
hPal As Long
End Type
Private Type GdiplusStartupInput
GdiplusVersion As Long
DebugEventCallback As Long
SuppressBackgroundThread As Long
SuppressExternalCodecs As Long
End Type
Private Declare Function GdiplusStartup Lib "GDIPlus" ( _
token As Long, _
inputbuf As GdiplusStartupInput, _
Optional ByVal outputbuf As Long = 0) As Long
Private Declare Function GdipCreateBitmapFromFile Lib "GDIPlus" ( _
ByVal FileName As Long, _
bitmap As Long) As Long
Private Declare Function GdipCreateHBITMAPFromBitmap Lib "GDIPlus" ( _
ByVal bitmap As Long, _
hbmReturn As Long, _
ByVal background As Long) As Long
Private Declare Function GdipDisposeImage Lib "GDIPlus" ( _
ByVal Image As Long) As Long
Private Declare Function GdiplusShutdown Lib "GDIPlus" ( _
ByVal token As Long) As Long
Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" ( _
PicDesc As PICTDESC, _
RefIID As GUID, _
ByVal fPictureOwnsHandle As Long, _
IPic As IPicture) As Long
Public Function LoadImage(ByVal strFName As String) As IPicture
Dim uGdiInput As GdiplusStartupInput
Dim hGdiPlus As Long
Dim hGdiImage As Long
Dim hBitmap As Long
uGdiInput.GdiplusVersion = 1
If GdiplusStartup(hGdiPlus, uGdiInput) = 0 Then
If GdipCreateBitmapFromFile(StrPtr(strFName), hGdiImage) = 0 Then
GdipCreateHBITMAPFromBitmap hGdiImage, hBitmap, 0
Set LoadImage = ConvertToIPicture(hBitmap)
GdipDisposeImage hGdiImage
End If
GdiplusShutdown hGdiPlus
End If
End Function
Public Function ConvertToIPicture(ByVal hPic As Long) As IPicture
Dim uPicInfo As PICTDESC
Dim IID_IDispatch As GUID
Dim IPic As IPicture
Const PICTYPE_BITMAP = 1
With IID_IDispatch
.Data1 = &H7BF80980
.Data2 = &HBF32
.Data3 = &H101A
.Data4(0) = &H8B
.Data4(1) = &HBB
.Data4(2) = &H0
.Data4(3) = &HAA
.Data4(4) = &H0
.Data4(5) = &H30
.Data4(6) = &HC
.Data4(7) = &HAB
End With
With uPicInfo
.Size = Len(uPicInfo)
.Type = PICTYPE_BITMAP
.hPic = hPic
.hPal = 0
End With
OleCreatePictureIndirect uPicInfo, IID_IDispatch, True, IPic
Set ConvertToIPicture = IPic
End Function
But png images loading with black backgrounds instead of transparent? how to fix this?

Answer 1

I use this function (note the function can be in a separate module):
Private Sub UserForm_Activate()
With Me.Image1
.BorderStyle = fmBorderStyleNone
.PictureSizeMode = fmPictureSizeModeZoom
.BackStyle = fmBackStyleTransparent
.Picture = LoadImage("C:\images\MinersBag.png")
End With
end sub
Public Function LoadImagePat(ByVal h$) As IPicture 'si LoadImage ne marche pas , ou ne fait pas la transparance correct :
'code by lepelletier Patrick 28/02/2016
Dim Aff As Boolean
Dim Pic As Shape
With Application
Aff = .ScreenUpdating
.ScreenUpdating = False
End With
Set Pic = ActiveSheet.Pictures.Insert(h).ShapeRange(1)
With Pic
.Copy
Set LoadImagePat = PastePicture
.Delete
End With
Set Pic = Nothing
If Aff Then Application.ScreenUpdating = True
End Function
The PastPicture routine is by Stephen Bullen and is found here (direct download link). In case of link rot, here is a copy of modPastePicture. Save it all into modPastePicture.bas, then import that file into the VBA editor.
Attribute VB_Name = "modPastePicture"
'***************************************************************************
'*
'* MODULE NAME: Paste Picture
'* AUTHOR & DATE: STEPHEN BULLEN, Office Automation Ltd
'* 15 November 1998
'*
'* CONTACT: Stephen#oaltd.co.uk
'* WEB SITE: http://www.oaltd.co.uk
'*
'* DESCRIPTION: Creates a standard Picture object from whatever is on the clipboard.
'* This object can then be assigned to (for example) and Image control
'* on a userform. The PastePicture function takes an optional argument of
'* the picture type - xlBitmap or xlPicture.
'*
'* The code requires a reference to the "OLE Automation" type library
'*
'* he code in this module has been derived from a number of sources
'* discovered on MSDN.
'*
'* To use it, just copy this module into your project, then you can use:
'* Set Image1.Picture = PastePicture(xlPicture)
'* to paste a picture of whatever is on the clipboard into a standard image control.
'*
'* PROCEDURES:
'* PastePicture The entry point for the routine
'* CreatePicture Private function to convert a bitmap or metafile handle to an OLE reference
'* fnOLEError Get the error text for an OLE error code
'***************************************************************************
Option Explicit
Option Compare Text
''' User-Defined Types for API Calls
'Declare a UDT to store a GUID for the IPicture OLE Interface
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(0 To 7) As Byte
End Type
'Declare a UDT to store the bitmap information
Private Type uPicDesc
Size As Long
Type As Long
hPic As Long
hPal As Long
End Type
'''Windows API Function Declarations
'Does the clipboard contain a bitmap/metafile?
Private Declare Function IsClipboardFormatAvailable Lib "user32" (ByVal wFormat As Integer) As Long
'Open the clipboard to read
Private Declare Function OpenClipboard Lib "user32" (ByVal hwnd As Long) As Long
'Get a pointer to the bitmap/metafile
Private Declare Function GetClipboardData Lib "user32" (ByVal wFormat As Integer) As Long
'Close the clipboard
Private Declare Function CloseClipboard Lib "user32" () As Long
'Convert the handle into an OLE IPicture interface.
Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (PicDesc As uPicDesc, RefIID As GUID, ByVal fPictureOwnsHandle As Long, IPic As IPicture) As Long
'Create our own copy of the metafile, so it doesn't get wiped out by subsequent clipboard updates.
Declare Function CopyEnhMetaFile Lib "gdi32" Alias "CopyEnhMetaFileA" (ByVal hemfSrc As Long, ByVal lpszFile As String) As Long
'Create our own copy of the bitmap, so it doesn't get wiped out by subsequent clipboard updates.
Declare Function CopyImage Lib "user32" (ByVal handle As Long, ByVal un1 As Long, ByVal n1 As Long, ByVal n2 As Long, ByVal un2 As Long) As Long
'The API format types we're interested in
Const CF_BITMAP = 2
Const CF_PALETTE = 9
Const CF_ENHMETAFILE = 14
Const IMAGE_BITMAP = 0
Const LR_COPYRETURNORG = &H4
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''' Subroutine: PastePicture
'''
''' Purpose: Get a Picture object showing whatever's on the clipboard.
'''
''' Arguments: lXlPicType - The type of picture to create. Can be one of:
''' xlPicture to create a metafile (default)
''' xlBitmap to create a bitmap
'''
''' Date Developer Action
''' --------------------------------------------------------------------------
''' 30 Oct 98 Stephen Bullen Created
''' 15 Nov 98 Stephen Bullen Updated to create our own copies of the clipboard images
'''
Function PastePicture(Optional lXlPicType As Long = xlPicture) As IPicture
'Some pointers
Dim h As Long, hPicAvail As Long, hPtr As Long, hPal As Long, lPicType As Long, hCopy As Long
'Convert the type of picture requested from the xl constant to the API constant
lPicType = IIf(lXlPicType = xlBitmap, CF_BITMAP, CF_ENHMETAFILE)
'Check if the clipboard contains the required format
hPicAvail = IsClipboardFormatAvailable(lPicType)
If hPicAvail <> 0 Then
'Get access to the clipboard
h = OpenClipboard(0&)
If h > 0 Then
'Get a handle to the image data
hPtr = GetClipboardData(lPicType)
'Create our own copy of the image on the clipboard, in the appropriate format.
If lPicType = CF_BITMAP Then
hCopy = CopyImage(hPtr, IMAGE_BITMAP, 0, 0, LR_COPYRETURNORG)
Else
hCopy = CopyEnhMetaFile(hPtr, vbNullString)
End If
'Release the clipboard to other programs
h = CloseClipboard
'If we got a handle to the image, convert it into a Picture object and return it
If hPtr <> 0 Then Set PastePicture = CreatePicture(hCopy, 0, lPicType)
End If
End If
End Function
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''' Subroutine: CreatePicture
'''
''' Purpose: Converts a image (and palette) handle into a Picture object.
'''
''' Requires a reference to the "OLE Automation" type library
'''
''' Arguments: None
'''
''' Date Developer Action
''' --------------------------------------------------------------------------
''' 30 Oct 98 Stephen Bullen Created
'''
Private Function CreatePicture(ByVal hPic As Long, ByVal hPal As Long, ByVal lPicType) As IPicture
' IPicture requires a reference to "OLE Automation"
Dim r As Long, uPicInfo As uPicDesc, IID_IDispatch As GUID, IPic As IPicture
'OLE Picture types
Const PICTYPE_BITMAP = 1
Const PICTYPE_ENHMETAFILE = 4
' Create the Interface GUID (for the IPicture interface)
With IID_IDispatch
.Data1 = &H7BF80980
.Data2 = &HBF32
.Data3 = &H101A
.Data4(0) = &H8B
.Data4(1) = &HBB
.Data4(2) = &H0
.Data4(3) = &HAA
.Data4(4) = &H0
.Data4(5) = &H30
.Data4(6) = &HC
.Data4(7) = &HAB
End With
' Fill uPicInfo with necessary parts.
With uPicInfo
.Size = Len(uPicInfo) ' Length of structure.
.Type = IIf(lPicType = CF_BITMAP, PICTYPE_BITMAP, PICTYPE_ENHMETAFILE) ' Type of Picture
.hPic = hPic ' Handle to image.
.hPal = IIf(lPicType = CF_BITMAP, hPal, 0) ' Handle to palette (if bitmap).
End With
' Create the Picture object.
r = OleCreatePictureIndirect(uPicInfo, IID_IDispatch, True, IPic)
' If an error occured, show the description
If r <> 0 Then Debug.Print "Create Picture: " & fnOLEError(r)
' Return the new Picture object.
Set CreatePicture = IPic
End Function
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''' Subroutine: fnOLEError
'''
''' Purpose: Gets the message text for standard OLE errors
'''
''' Arguments: None
'''
''' Date Developer Action
''' --------------------------------------------------------------------------
''' 30 Oct 98 Stephen Bullen Created
'''
Private Function fnOLEError(lErrNum As Long) As String
'OLECreatePictureIndirect return values
Const E_ABORT = &H80004004
Const E_ACCESSDENIED = &H80070005
Const E_FAIL = &H80004005
Const E_HANDLE = &H80070006
Const E_INVALIDARG = &H80070057
Const E_NOINTERFACE = &H80004002
Const E_NOTIMPL = &H80004001
Const E_OUTOFMEMORY = &H8007000E
Const E_POINTER = &H80004003
Const E_UNEXPECTED = &H8000FFFF
Const S_OK = &H0
Select Case lErrNum
Case E_ABORT
fnOLEError = " Aborted"
Case E_ACCESSDENIED
fnOLEError = " Access Denied"
Case E_FAIL
fnOLEError = " General Failure"
Case E_HANDLE
fnOLEError = " Bad/Missing Handle"
Case E_INVALIDARG
fnOLEError = " Invalid Argument"
Case E_NOINTERFACE
fnOLEError = " No Interface"
Case E_NOTIMPL
fnOLEError = " Not Implemented"
Case E_OUTOFMEMORY
fnOLEError = " Out of Memory"
Case E_POINTER
fnOLEError = " Invalid Pointer"
Case E_UNEXPECTED
fnOLEError = " Unknown Error"
Case S_OK
fnOLEError = " Success!"
End Select
End Function

Answer 2

Why not use Insert/Picture which accepts png files? You can still assign a macro to it.
AFAIK only png files support transparent backgrounds.
If it's for a userform, I don't know of anything you can add that supports transparent objects. However your background should be static so you can fake it.
Perhaps you could just match the color behind the image? You can get the color code from your form properties.
If it's a static background but not a single color, you could take a screen shot and clip the portion you want as background for the image, layer the 2 images together in a photo editor then output as bmp which will flatten the two layers as one. There are free photo editors that can do this.