If Statement (If File Exists)

could someone please have a look at this, there seems to be a problem, its not progressing pass the first ELSEIF.

I'm attempting to create a program that automatically installs DLL's & OCX files into the system32 folder.

VB Code:

Private Sub Label2_Click()
 
    Dim FileToBeCopied As String
    Dim Location As String
    
    FileToBeCopied = Text1.Text
    Location = "C:\WINDOWS\system32\"
    
    If FileToBeCopied = "" Then
    
        MsgBox "You Need To Select A File To Automatically Install", vbInformation, "No File Selected!"
        
    ElseIf FileExists(Location & FileToBeCopied) Then
    
        MsgBox "The File Has Been Detected As Already Existing", vbExclamation, "The Program Will End"
        
    Else
    
        On Error Resume Next 'Error Proof
        FileCopy FileToBeCopied, Location 'Copy The File FILENAME, PATH
        
    End If
            
End Sub

& this is what I have in the module for fileexists

VB Code:

Function FileExists(strFile As String) As Integer
 
    Dim lSize As Long
 
    On Error Resume Next
 
    lSize = -1
 
    lSize = FileLen(strFile)
 
    If lSize = 0 Then
 
        FileExists = 0
 
    ElseIf lSize > 0 Then
 
        FileExists = 1
 
    Else
 
        FileExists = -1
 
    End If
 
End Function

any idea's...:confused:

Explian "No progressing"

Woka

well it's not progressing pass this

VB Code:

ElseIf FileExists(Location & FileToBeCopied) Then
    
        MsgBox "The File Has Been Detected As Already Existing", vbExclamation, "The Program Will End"

I have manually checked to see that the file does NOT exist in the system folder however it is still displaying the MsgBox "The File Has Been Detected As Already Existing" and is NOT progressing to copy the file.

Try using

strRet = DIR(strFilePath)

to check for the existence of a file If strRet = "" then strFilePath does not exist

lol, maybe progressing was thw wrong word, I mean its NOT getting PASSED that ElseIf

You are returning an integer and using it as a boolean. Take a look at what is being returned, and look at how it is being evaluated. You will probably see that it is evaluating in a way you didn't expect.

I'm sorry, I don't understand, its safe to say im currently learning VB and not familar with what your saying

There's a few problems.

VB Code:

ElseIf FileExists(Location & FileToBeCopied) Then

is combing both locations of the files (original and wanted location of the file to be copied). You also need to check the value of FileExists before continuing by doing something like this:

VB Code:

ElseIf FileExists(Location) = 1 Then

. This should get you started.

The FileExists function has 3 possible return values 0, 1 -1. Your If statement is checking for a True value only. True is "any non-zero" value, so when FileExists returns 1 or -1, the If statement sees this as True and will execute the code.

Change your If statement to

ElseIf FileExists(Location & FileToBeCopied) = 1 Then

Yes, please ignore the beginning of my previous post. That was an error created by myself and not you.

I managed to fix it using this method and it seems to be working perfectly.

VB Code:

If FileToBeCopied = "" Then
    
        MsgBox "You Need To Select A File To Automatically Install", _
        vbInformation, "No File Selected!" 'No File Selected
        
    ElseIf Dir$("C:\WINDOWS\system32\" & FilenameTitle) <> "" Then
    
        MsgBox "The File Has Been Detected As Already Existing", _
        vbExclamation, "The Program Will End" 'File Detected
    
    Else
    
        On Error Resume Next 'Error Proof
        FileCopy Text1.Text, Text3.Text 'Copy The File SOURCE, DESTINATION
        MsgBox "The File Was Successfully Copied", _
        vbInformation, "Successful Copy" 'Display Message Box
        
    End If

I put a textbox hidden in the form but not visible that when the user selects the filename from the common dialog, it shows the filetitle in that textbox so it checks

VB Code:

"C:\WINDOWS\system32\" & FilenameTitle

anyway thanks guys, learn something new everyday:bigyello:

VB Code:

On Error Resume Next 'Error Proof
        FileCopy Text1.Text, Text3.Text 'Copy The File SOURCE, DESTINATION
        MsgBox "The File Was Successfully Copied", _
        vbInformation, "Successful Copy" 'Display Message Box

Bad bad bad bad.

VB Code:

On Error Goto ErrorHandler
   If FileToBeCopied = "" Then
    
        MsgBox "You Need To Select A File To Automatically Install", _
        vbInformation, "No File Selected!" 'No File Selected
        
    ElseIf Dir$("C:\WINDOWS\system32\" & FilenameTitle) <> "" Then
    
        MsgBox "The File Has Been Detected As Already Existing", _
        vbExclamation, "The Program Will End" 'File Detected
    
    Else
        FileCopy Text1.Text, Text3.Text 'Copy The File SOURCE, DESTINATION
        MsgBox "The File Was Successfully Copied", _
        vbInformation, "Successful Copy" 'Display Message Box
    End If
    Exit Sub
ErrorHandler:
    MsgBox "ERROR!!! " & err.description

Also...

VB Code:

MsgBox "The File Was Successfully Copied", _
        vbInformation, "Successful Copy" 'Display Message Box

Why span 2 lines???????
This is a pain the the butt to read...at 1st glance it looks like 2 lines...just do:

VB Code:

MsgBox "The File Was Successfully Copied", vbInformation, "Successful Copy" 'Display Message Box

Woka

Quote:

---

Why span 2 lines???????

---

dunno, its just a habbit I picked up cause I dont like having to read code n scroll across the code window

thanks for the input, that errorhandler would be better, I've included that

No probs.

Spanning multiple lines can cause "problems" when debugging...although the MsgBox isn't that much of a problem.

Lets say you have:

VB Code:

Dim strSQL As String
    strSQL = "SELECT * " _
    & "FROM Jobs " _
    & "WHERE Completed = 1 "

While debugging in runtime you realise you need to add "AND UserID = 3" as you missed this part off.
Then VB would reset your project for you to add this like:

VB Code:

Dim strSQL As String
    strSQL = "SELECT * " _
    & "FROM Jobs " _
    & "WHERE Completed = 1 " _
    & "AND UserID = 3 "

If you did:

VB Code:

Dim strSQL As String
    strSQL = "SELECT * " 
    strSQL = strSQL & "FROM Jobs "
    strSQL = strSQL & "WHERE Completed = 1 "

Then when debugging you can change this SQL statement any which way, and the IDE will not reset your project. You could even delete the enire strSQL statement and VB would still not reset the project, where as when using _ it would.

Not a serious problem, just annoying.

Woof

ok thanks man, Im currently learning VB so im targetting myself to learn 5 new things in VB a day to one day become a good programmer thne I can help people like you have helped me, I appreicate it:D

Err.Clear

After you've handled the error, otherwise another active error handler in the calling subs will pick up the error.

No probs.
Everyone starts somewhere :D

If you ever need any help then give me a shout.

Woooooof

Quote:

---

Originally posted by leinad31
Err.Clear

After you've handled the error, otherwise another active error handler in the calling subs will pick up the error.

---

I didnt understand what you meant until I just tested the program, now I do, thank you;)

Quote:

---

Originally posted by Wokawidget
No probs.
Everyone starts somewhere

If you ever need any help then give me a shout.

Woooooof

---

Appreicated:bigyello:

Don't you need to instantiate a fileSystemObject to check if a file or folder exists? Isn't that one of the methods of the object?

He used Dir() instead of a file system object.

In the same way as you can choose to use DAO or ADO to access a database.

Many ways to skin a cat.

and at the end of the day, the cat will still make the same noise when you skin it ;)

Woka

Aha! Grazie.