So all together now:
Option Explicit
'For looking at registry keys
'To: Open key ready to look at
Private Declare Function RegOpenKey Lib "advapi32.dll" Alias "RegOpenKeyA"
(ByVal hKey As Long, ByVal lpSubKey As String, phkResult
As Long) As Long
'To: Look at key
Private Declare Function
RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey
As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, ByVal lpData As Any, lpcbData As Long) As Long
'To: Close the key when it's finished
with
Private Declare
Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Private Const HKEY_CLASSES_ROOT = &H80000000
Private Const
KEY_READ = &H20019 'To allow us to READ the registry keys
'For Drawing the icon
'To: Retrieve the icon from the .EXE, .DLL or .ICO
Private Declare
Function ExtractIcon Lib "shell32.dll" Alias "ExtractIconA" (ByVal hInst
As Long, ByVal lpszExeFileName
As String, ByVal nIconIndex
As Long) As Long
'To: Draw the icon into our picture box
Private Declare
Function DrawIcon Lib "user32.dll" (ByVal hDC As Long, ByVal X As Long, ByVal Y As Long, ByVal hIcon As Long) As Long
'To: Clean up after our selves (destroy the icon that "ExtractIcon" created)
Private Declare Function
DestroyIcon Lib "user32.dll" (ByVal hIcon As Long) As Long
'For Finding the System folder
Private Declare Function GetSystemDirectory Lib "kernel32.dll" Alias
"GetSystemDirectoryA" (ByVal lpBuffer
As String, ByVal nSize As
Long) As Long
Private Sub GetDefaultIcon(FileName
As String, Picture_hDC As Long )
Dim
TempFileName As String 'Never manipulate an input unless it doubles as an output
Dim
lngError As Long'For receiving error
numbers
Dim lngRegKeyHandle As Long'Stores the "handle" of the registry key that is currently
open
Dim strProgramName As String'Stores the contents of the first registry key
Dim
strDefaultIcon As String'Stores the
contents of the second registry key
Dim
lngStringLength As Long'Sets /
Returns the length of the output string
Dim lngIconNumber
As Long'Stores the icon number within
a file
Dim lngIcon As Long'Stores the "Icon Handle" for the default icon
Dim intN As Integer 'For any temporary numbers
TempFileName = Right(FileName, Len(FileName) - InStrRev(FileName, ".") + 1)
If LCase(TempFileName) = ".exe" Then
strDefaultIcon = Space(260)
lngStringLength = GetSystemDirectory(strDefaultIcon, 260)
strDefaultIcon = Left(strDefaultIcon, lngStringLength) & "\SHELL32.DLL"
lngIconNumber = 2
GoTo Draw_Icon
End If
lngError = RegOpenKey(HKEY_CLASSES_ROOT, TempFileName, lngRegKeyHandle)
If lngError Then GoTo No_Icon 'we do not even have a
valid extension so lets NOT try to find an icon!
lngStringLength = 260
strProgramName = Space$(260) 'Make space for the incoming string
'Get the key
value:
lngError = RegQueryValueEx(lngRegKeyHandle, vbNullString, 0, 0, strProgramName, lngStringLength)
If lngError Then'if
there's an error then BIG TROUBLE so lets use the normal "windows"
icon
lngError = RegCloseKey(lngRegKeyHandle) 'the world may be about to end
(or just an error) but we'll clean up anyway
GoTo No_Icon
End If
lngError = RegCloseKey(lngRegKeyHandle) 'if this generates an
error then we can't do anything about it anyway
strProgramName =
Left(strProgramName, lngStringLength - 1) 'Cut the name down to size
'Use the value of the last key in the name of the next one
(strProgramName)
lngError = RegOpenKey(HKEY_CLASSES_ROOT, strProgramName & "\DefaultIcon", lngRegKeyHandle)
If lngError Then GoTo No_Icon 'there is no icon for this extension so lets NOT try to load what
doesn't exist!
'The rest is just the same as before
lngStringLength = 260
strDefaultIcon = Space$(260)
lngError = RegQueryValueEx(lngRegKeyHandle, vbNullString, 0, 0, strDefaultIcon, lngStringLength)
If lngError Then
lngError =
RegCloseKey(lngRegKeyHandle)
GoTo No_Icon
End
If
lngError = RegCloseKey(lngRegKeyHandle)
strDefaultIcon = Trim$(Left(strDefaultIcon, lngStringLength - 1))
intN =
InStrRev(strDefaultIcon, ",") 'Find the commer
If intN <
1 Then GoTo No_Icon 'We MUST have an icon number and it will be after the ",": NO COMMA NO DEFAULT ICON
lngIconNumber =
Trim$(Right(strDefaultIcon, Len(strDefaultIcon) - intN)) 'What
number is after the comma
strDefaultIcon =
Trim$(Left(strDefaultIcon, intN - 1)) 'We only want what's
before the comma in the file name
Draw_Icon:
lngIcon = ExtractIcon(App.hInstance, strDefaultIcon, lngIconNumber) 'Extract the Icon
If lngIcon = 1
Or lngIcon = 0 Then GoTo No_Icon
'if 1 or 0 then after all that the Icon Could not be retrieved
lngError = DrawIcon(Picture_hDC, 0, 0, lngIcon) 'Draw the icon in the box
'If that was
unsucessful then we can't do anything about it now!
lngError = DestroyIcon(lngIcon)
'Again we can't correct
any errors now
Exit Sub
No_Icon:
'No icon could be found so we use the normal windows icon
'This icon is held in shell32.dll in the
system directory, Icon 0
strDefaultIcon = Space(260)
lngStringLength = GetSystemDirectory(strDefaultIcon, 260)
strDefaultIcon = Left(strDefaultIcon, lngStringLength) & "\SHELL32.DLL"
lngIconNumber = 0
GoTo Draw_Icon
End Sub
Just incase it’s not obvious (I hope i is), here’s how to use this subroutine (remember that picture box etc. that I said you’d need at the beginning) and make sure that “AutoRedraw” is set to True!:
Private Sub Command1_Click()
Picture1.Cls
GetDefaultIcon Text1.Text, Picture1.hDC
End Sub
Simple as that! I hope this has all been helpful.
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