Private Const MAX_PATH As Long = 260
Private Const HKEY_CLASSES_ROOT As Long = &H80000000
Private Const ERROR_SUCCESS As Long = 0
Private Const vbDot As Long = 46
Private Const SHGFI_USEFILEATTRIBUTES As Long = &H10
Private Const SHGFI_TYPENAME As Long = &H400
Private Const LB_SETTABSTOPS As Long = &H192
Private Type FILETIME
dwLowDateTime As Long
dwHighDateTime As Long
End Type
Private Type SHFILEINFO
hIcon As Long
iIcon As Long
dwAttributes As Long
szDisplayName As String * MAX_PATH
szTypeName As String * 80
End Type
Private Declare Function RegEnumKeyEx Lib "advapi32.dll" Alias "RegEnumKeyExA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpName As String, lpcbName As Long, ByVal lpReserved As Long, ByVal lpClass As String, lpcbClass As Long, lpftLastWriteTime As FILETIME) As Long
Private Declare Function SHGetFileInfo Lib "shell32" Alias "SHGetFileInfoA" (ByVal pszPath As String, ByVal dwFileAttributes As Long, psfi As SHFILEINFO, ByVal cbFileInfo As Long, ByVal uFlags As Long) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Sub GetAssociatedFileListing()
Dim dwIndex As Long
Dim sTypeName As String
Dim sSubkey As String * MAX_PATH
Dim sClass As String * MAX_PATH
Dim ft As FILETIME
Do While RegEnumKeyEx(HKEY_CLASSES_ROOT, _
dwIndex, _
sSubkey, _
MAX_PATH, _
0, sClass, _
MAX_PATH, ft) = ERROR_SUCCESS
If Asc(sSubkey) = vbDot Then
'Pass the returned string to get the file type
sTypeName = GetFileType(sSubkey)
If Len(sTypeName) > 0 Then
List1.AddItem TrimNull(sSubkey) & vbTab & sTypeName
End If
End If
dwIndex = dwIndex + 1
Loop
End Sub
Private Function GetFileType(sFile As String) As String
'If successful returns the specified file's
'typename, returns an empty string otherwise.
'sFile does not have to exist and can be
'just a file extension.
Dim sfi As SHFILEINFO
If SHGetFileInfo(sFile, 0&, _
sfi, Len(sfi), _
SHGFI_TYPENAME Or SHGFI_USEFILEATTRIBUTES) Then
GetFileType = TrimNull(sfi.szTypeName)
End If
End Function
Private Function TrimNull(startstr As String) As String
'returns the string up to the first
'null, if present, or the passed string
Dim pos As Integer
pos = InStr(startstr, Chr$(0))
If pos Then
TrimNull = Left$(startstr, pos - 1)
Exit Function
End If
TrimNull = startstr
End Function
Private Sub Command1_Click()
List1.Clear
Screen.MousePointer = vbHourglass
'fill the listbox box with the file types and their extensions
Call GetAssociatedFileListing
Screen.MousePointer = vbDefault
End Sub
