问题
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I have a stdole.StdPicture Object of the Type vbPicTypeIcon. I need to convert it to Type vbPicTypeBitmap. Due to project contraints, I need to be able to do this using Win32 or VBA. I am trying to load a file's icon to a command bar button. Here is what I have so far. It produces a lovely black square:) I am really new to graphics land so pardon me if it's a basic question.
Option Explicit
Private Const vbPicTypeBitmap As Long = 1
Private Const vbPicTypeIcon As Long = 3
Private Const SHGFI_ICON As Long = &H100&
Private Const SHGFI_SMALLICON As Long = &H1&
Private Type PICTDESC
cbSize As Long
pictType As Long
hIcon As Long
hPal As Long
End Type
Private Type typSHFILEINFO
hIcon As Long
iIcon As Long
dwAttributes As Long
szDisplayName As String * 260
szTypeName As String * 80
End Type
Private Declare Function DestroyIcon Lib "user32" (ByVal hIcon As Long) As Long
Private Declare Function SHGetFileInfoA Lib "shell32.dll" (ByVal pszPath As String, ByVal dwFileAttributes As Long, psfi As typSHFILEINFO, ByVal cbSizeFileInfo As Long, ByVal uFlags As Long) As Long
Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (lpPictDesc As PICTDESC, riid As Any, ByVal fOwn As Long, ipic As stdole.IPictureDisp) As Long
Public Sub Test()
Dim btn As Office.CommandBarButton
Dim lngRslt As Long
Dim lngAppInstc As Long
Dim strFilePath As String
Dim tFI As typSHFILEINFO
Dim pic As stdole.IPictureDisp
Set btn = TestEnv.GetTestButton
lngAppInstc = Excel.Application.Hinstance
strFilePath = TestEnv.GetTestFile
If LenB(strFilePath) = 0& Then
Err.Raise 70&
End If
SHGetFileInfoA strFilePath, 0&, tFI, LenB(tFI), SHGFI_ICON Or SHGFI_SMALLICON
Set pic = IconToPicture(tFI.hIcon)
btn.Picture = pic
Exit_Proc:
On Error Resume Next
If tFI.hIcon Then
lngRslt = DestroyIcon(tFI.hIcon)
End If
Exit Sub
Err_Hnd:
MsgBox Err.Description, vbCritical Or vbMsgBoxHelpButton, Err.Number, Err.HelpFile, Err.HelpContext
Resume Exit_Proc
Resume
End Sub
Private Function IconToPicture(ByVal hIcon As Long) As stdole.IPictureDisp
'Modified from code by Francesco Balena on DevX
Dim pic As PICTDESC
Dim guid(0 To 3) As Long
Dim pRtnVal As stdole.IPictureDisp
pic.cbSize = LenB(pic)
'pic.pictType = vbPicTypeBitmap
pic.pictType = vbPicTypeIcon
pic.hIcon = hIcon
' this is the IPicture GUID {7BF80980-BF32-101A-8BBB-00AA00300CAB}
' we use an array of Long to initialize it faster
guid(0) = &H7BF80980
guid(1) = &H101ABF32
guid(2) = &HAA00BB8B
guid(3) = &HAB0C3000
' create the picture,
' return an object reference right into the function result
OleCreatePictureIndirect pic, guid(0), True, pRtnVal
Set IconToPicture = pRtnVal
End Function
回答1:
Give this post at vbAccelerator.com a shot.
Edit: The closest thing I found for VBA is this post on officeblogs.net. The code takes an icon instead of an icon handle though.
回答2:
Okay, I have cleaned up the code. The ExtractAssociatedIcon method is returning a 64x64 icon so for the example I have just hard coded that size. The picturebox has neen removed and the image is assigned to the form's picture property to avoid confusion.
Example: copy the code to a new form and run
Option Explicit
Private Declare Function ExtractAssociatedIcon Lib "shell32.dll" Alias "ExtractAssociatedIconA" (ByVal hInst As Long, ByVal lpIconPath As String, lpiIcon As Long) As Long
Private Declare Function DestroyIcon Lib "user32" (ByVal hIcon As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc 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 FillRect Lib "user32" (ByVal hdc As Long, lpRect As RECT, ByVal hBrush As Long) As Long
Private Declare Function DrawIconEx Lib "user32" (ByVal hdc As Long, ByVal xLeft As Long, ByVal yTop As Long, ByVal hIcon As Long, ByVal cxWidth As Long, ByVal cyWidth As Long, ByVal istepIfAniCur As Long, ByVal hbrFlickerFreeDraw As Long, ByVal diFlags As Long) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (ByRef PicDesc As PICTDESC_BMP, ByRef RefIID As GUID, ByVal fPictureOwnsHandle As Long, ByRef IPic As IPicture) As Long
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
End Type
Private Type PICTDESC_BMP
Size As Long
Type As Long
hBmp As Long
hPal As Long
Reserved As Long
End Type
Const DI_MASK = &H1
Const DI_IMAGE = &H2
Const DI_NORMAL = DI_MASK Or DI_IMAGE
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Sub Form_Load()
Call GetIcon("C:\Program Files\Internet Explorer\iexplore.exe")
End Sub
Private Sub GetIcon(ByVal sFileName As String)
Dim hIcon As Long
Dim hAssocIcon As Long
Dim sAssocFile As String * 260
Dim sCommand As String
Dim lDC As Long
Dim lBmp As Long
Dim R As RECT
Dim OldBMP As Long
Me.AutoRedraw = True
hIcon = ExtractAssociatedIcon(App.hInstance, sFileName, hAssocIcon)
If hIcon <> 0 Then 'no icons found - use icon generic icon resource
'Create a device context, compatible with the screen
lDC = CreateCompatibleDC(GetDC(0&))
'Create a bitmap, compatible with the screen
lBmp = CreateCompatibleBitmap(GetDC(0&), 64, 64)
'Select the bitmap into the device context
OldBMP = SelectObject(lDC, lBmp)
' Set the rectangles' values
R.Left = 0
R.Top = 0
R.Right = 64
R.Bottom = 64
' Fill the rect with white
FillRect lDC, R, 0
' Draw the icon
Call DrawIconEx(lDC, 0, 0, hIcon, 64, 64, 0, 0, DI_NORMAL)
Me.Picture = PictureFromBitmap(lBmp, 0&)
DestroyIcon (hIcon)
End If
Call SelectObject(lDC, OldBMP)
Call DeleteObject(lDC)
End Sub
Private Function PictureFromBitmap(ByVal hBmp As Long, ByVal hPal As Long) As StdPicture
Dim IPictureIID As GUID
Dim IPic As IPicture
Dim tagPic As PICTDESC_BMP
Dim lpGUID As Long
' Fill in the IPicture GUID
' {7BF80980-BF32-101A-8BBB-00AA00300CAB}
With IPictureIID
.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
' Set the properties on the picture object
With tagPic
.Size = Len(tagPic)
.Type = vbPicTypeBitmap
.hBmp = hBmp
.hPal = hPal
End With
' Create a picture that will delete it's bitmap when it is finished with it
Call OleCreatePictureIndirect(tagPic, IPictureIID, 1, IPic)
' Return the picture to the caller
Set PictureFromBitmap = IPic
End Function
回答3:
Search Google Groups for a thread entitled, Convert StdPicture from Icon to Bitmap.
UPDATE
No, I can't get it to work either.
But I was getting a terrible sense of deja vu as I was trying it... then remembered I definitely did this a couple of years ago i.e. adding icons with masks to Excel CommandBarButtons at runtime, not knowing which version of Excel it was being opened in. Sadly I can't find the code (not in source control so didn't make it to release? I'm almost sure I got it working).
I think I borrowed heavily from these articles:
How To Create a Transparent Picture For Office CommandBar Buttons
How To Set the Mask and Picture Properties for Office XP CommandBars
And because Excel has no clipboard, I seem to recall borrowing from Stephen Bullen's PastePicture.zip.
Hope this doesn't send you off on a wild goose chase :)
回答4:
LoadPicture It returns an object that supports IPictureDisp. It may not be vbPicTypeBitmap though. Not sure if you can call GdipCreateBitmapFromFile in VBA.
来源：https://stackoverflow.com/questions/1507385/how-do-i-convert-a-stdole-stdpicture-to-a-different-type