|
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Visual Basic Icon Routines SHGetFileInfo: Extracting 16x16 and 32x32 Associated Icons |
||
Posted: | Friday December 27, 1996 | |
Updated: | Monday December 26, 2011 | |
Applies to: | VB4-32, VB5, VB6 | |
Developed with: | VB4-32, Windows 95 | |
OS restrictions: | None | |
Author: | VBnet - Randy Birch, Don Bradner | |
Related: |
SHGetFileInfo: Extracting a 16x16 Associated Icon SHGetFileInfo: Extracting Associated Icons for a StatusBar |
|
Prerequisites |
None. |
|
VB4-32/VB5
code to retrieve the small (16x16) and large (32x32) pixel system icon associated with a given application using SHGetFileInfo. If the
application does not have an icon associated with it, the default Windows unknown icon will be returned. Note that extraction techniques using ExtractIcon only return the 32x32 icon. ImageList_Draw routine adapted from code provided by Don Bradner. |
BAS Module Code |
Place the following code into the general declarations area of a bas module: |
|
Option Explicit '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ' Copyright ©1996-2011 VBnet/Randy Birch, All Rights Reserved. ' Some pages may also contain other copyrights by the author. '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ' Distribution: You can freely use this code in your own ' applications, but you may not reproduce ' or publish this code on any web site, ' online service, or distribute as source ' on any media without express permission. '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' Public Const MAX_PATH As Long = 260 Public Const SHGFI_DISPLAYNAME = &H200 Public Const SHGFI_EXETYPE = &H2000 Public Const SHGFI_SYSICONINDEX = &H4000 'system icon index Public Const SHGFI_LARGEICON = &H0 'large icon Public Const SHGFI_SMALLICON = &H1 'small icon Public Const SHGFI_SHELLICONSIZE = &H4 Public Const SHGFI_TYPENAME = &H400 Public Const ILD_TRANSPARENT = &H1 'display transparent Public Const BASIC_SHGFI_FLAGS = SHGFI_TYPENAME Or _ SHGFI_SHELLICONSIZE Or _ SHGFI_SYSICONINDEX Or _ SHGFI_DISPLAYNAME Or _ SHGFI_EXETYPE Public Type SHFILEINFO hIcon As Long iIcon As Long dwAttributes As Long szDisplayName As String * MAX_PATH szTypeName As String * 80 End Type Public Declare Function SHGetFileInfo Lib "shell32" _ Alias "SHGetFileInfoA" _ (ByVal pszPath As String, _ ByVal dwFileAttributes As Long, _ psfi As SHFILEINFO, _ ByVal cbSizeFileInfo As Long, _ ByVal uFlags As Long) As Long Public Declare Function ImageList_Draw Lib "comctl32" _ (ByVal himl As Long, ByVal i As Long, _ ByVal hDCDest As Long, ByVal x As Long, _ ByVal y As Long, ByVal flags As Long) As Long Public shinfo As SHFILEINFO |
Form Code |
On a form place two command buttons (Command1 &
Command2), two labels (Label1 & Label2), and two picture boxes (pixSmall and pixLarge). Assure both the form and both
picturebox scale modes are 1 - Twips.
Set the properties of both picture boxes to:
Set the properties of pixSmall to:
This should result in both the ScaleHeight and ScaleWidth of pixSmall
being 240 twips (or16 pixels)
This should result in both the ScaleHeight and ScaleWidth of pixLarge being 480 twips (or 32 pixels). Add the following code to the form: |
|
Option Explicit Private Sub Form_Load() 'centre the form on the screen Me.Move (Screen.Width - Me.Width) / 2, (Screen.Height - Me.Height) / 2 End Sub Private Sub Command2_Click() Unload Me End Sub Private Sub Command1_Click() 'working variables... Dim hImgSmall as Long 'the handle to the system image list Dim fName As String 'the file name to get icon from Dim fnFilter As String 'the file name filter Dim r As Long 'a little error handling to trap a cancel On Local Error GoTo Command1ErrorHandler 'get the file from the user fnFilter = "All Files (*.*)|*.*|" fnFilter = fnFilter & "Applications (*.exe)|*.exe|" fnFilter = fnFilter & "Windows Bitmap (*.bmp)|*.bmp|" fnFilter = fnFilter & "Icon Files (*.ico)|*.ico" CommonDlg1.CancelError = True CommonDlg1.Filter = fnFilter CommonDlg1.ShowOpen fName = CommonDlg1.FileName 'get the system icon associated with that file hImgSmall& = SHGetFileInfo(fName, 0&, _ shinfo, Len(shinfo), _ BASIC_SHGFI_FLAGS Or SHGFI_SMALLICON) hImgLarge& = SHGetFileInfo(fName, 0&, _ shinfo, Len(shinfo), _ BASIC_SHGFI_FLAGS Or SHGFI_LARGEICON) 'fill in the labels with the image's file data Label1.Caption = Left$(shinfo.szDisplayName, _ InStr(shinfo.szDisplayName, Chr$(0)) - 1) Label2.Caption = Left$(shinfo.szTypeName, _ InStr(shinfo.szTypeName, Chr$(0)) - 1) 'Set set the picture boxes to receive the icons. 'Their size must be 16x16 pixels (240x240 twips) 'for the small icon, and 32x32 pixels (480x480 twips) 'for the large icon, with no 3d or border. 'Clear any existing image pixSmall.Picture = LoadPicture() pixSmall.AutoRedraw = True pixLarge.Picture = LoadPicture() pixLarge.AutoRedraw = True 'draw the associated icons into the picture boxes Call ImageList_Draw(hImgSmall&, shinfo.iIcon, pixSmall.hDC, 0, 0, ILD_TRANSPARENT) Call ImageList_Draw(hImgLarge&, shinfo.iIcon, pixLarge.hDC, 0, 0, ILD_TRANSPARENT) 'realize the images by assigning its 'image property (where the icon was drawn) 'to the actual picture property pixSmall.Picture = pixSmall.Image pixLarge.Picture = pixLarge.Image 'Uncomment out the following code to save 'to the current path. Note that the background 'colour of the icons saved will be the background 'colour of the pixSmall/pixLarge control. ' SavePicture pixSmall, "testSmall.bmp" ' SavePicture pixLarge, "testLarge.bmp" Exit Sub Command1ErrorHandler: Exit Sub End Sub |
Comments |
Run the project, and select any file. On closing the
common dialog, the small and large icons associated with that file (or windows default Unknown icon) will be displayed, depending on whether
that selected file has a Registry association or not. The SHGetFileInfo API will return the registered icon for a given application or file, similar to that displayed in explorer. Don't confuse the ImageList_Draw API with the VB ImageList control. The former is the API used to draw an image to a control; the latter is the control itself. It is not necessary to have an imagelist control in a project to utilize the ImageList_Draw API, as its destination can be any control with an exposed hDC. |
|
|
|
|||||
|
|||||
|
|||||
Copyright ©1996-2011 VBnet and Randy Birch. All Rights Reserved. |