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Language: VB4/32,VB5,VB6
Expertise: Intermediate
Jan 15, 2000

GetExecutableFile - Find the program associated to a document file

Private Declare Function FindExecutable Lib "shell32.dll" Alias _
    "FindExecutableA" (ByVal lpFile As String, ByVal lpDirectory As String, _
    ByVal sResult As String) As Long

Private Const MAX_PATH = 260
Private Const ERROR_FILE_NO_ASSOCIATION = 31&
Private Const ERROR_FILE_NOT_FOUND = 2&
Private Const ERROR_PATH_NOT_FOUND = 3&
Private Const ERROR_FILE_SUCCESS = 32&

' Return the name and path of the EXEcutable file that
' is associated to the specified file.
' Returns a null string if there is no such associated file,
' and raises an error if the file or the path hasn't been found.

Public Function GetExecutableFile(ByVal FileName As String) As String
    Dim sPath As String, sFile As String
    Dim lPos As Long
    Dim sResult As String

    ' get the file's name and path, exit if no path is there
    lPos = InStrRev(FileName, "\")
    If lPos = 0 Then Exit Function
    sPath = Left$(FileName, lPos)
    sFile = Mid$(FileName, lPos + 1)
    
    ' call the FindExecutable API function and
    ' process the return value
    sResult = Space(MAX_PATH)
    Select Case FindExecutable(sFile, sPath, sResult)
        Case ERROR_FILE_NOT_FOUND
            Err.Raise 53     ' file not found
        Case ERROR_PATH_NOT_FOUND
            Err.Raise 76     ' path not found
        Case ERROR_FILE_NO_ASSOCIATION
            ' returns null string
        Case Is >= ERROR_FILE_SUCCESS
            ' extract the ANSI string that contains the
            ' name of the associated executable file
            GetExecutableFile = Left$(sResult, InStr(sResult & vbNullChar, _
                vbNullChar) - 1)
    End Select
End Function
Marco Bellinaso
 
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