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problem with savesetting

Posted on 2003-10-30
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Last Modified: 2006-11-17
how do i make savesetting save a registry value:

Path: "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run"
ValueName: "Test"
ValueData: "some path"

then id like to delete that value again
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Question by:Tai-San
  • 2
4 Comments
 
LVL 48

Expert Comment

by:Mikal613
Comment Utility
You have to make your own SAveSetting
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LVL 2

Author Comment

by:Tai-San
Comment Utility
example?
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LVL 48

Expert Comment

by:Mikal613
Comment Utility
Option Explicit

'startup.frm
'Lee Weiner - 03/02/99

'This project shows you how to make the required registry
'to cause your app to start every time Windows is started.  It
'does NOT place a shortcut in the STARTUP folder.  YOU have to
'decide whether this is a good thing or not.  Personally, I
'believe that the user should have total control over his/her
'PC, and using this code makes it very difficult for the
'average user to stop the program from running on startup.

'The same subkey exists under both HKEY_LOCAL_MACHINE and
'HKEY_CURRENT_USER.  Use the code as is to ensure your program
'starts EVERY TIME THE MACHINE IS BOOTED.  Change to
'HKEY_CURRENT_USER as the first argument to the RegOpenKeyEx
'function call if you want the program to start up only when a
'particular user logs on.

Private Declare Function RegOpenKeyEx Lib "advapi32.dll" Alias _
    "RegOpenKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, _
    ByVal ulOptions As Long, ByVal samDesired As Long, _
    phkResult As Long) As Long

Private Declare Function RegSetValueEx Lib "advapi32.dll" Alias _
    "RegSetValueExA" (ByVal hKey As Long, ByVal lpValueName As String, _
    ByVal Reserved As Long, ByVal dwType As Long, lpData As Any, _
    ByVal cbData As Long) As Long

Private Declare Function RegCloseKey Lib "advapi32.dll" _
    (ByVal hKey As Long) As Long

Private Const HKEY_CURRENT_USER = &H80000001
Private Const HKEY_LOCAL_MACHINE = &H80000002
Private Const KEY_SET_VALUE = &H2

Private Const REG_SZ = 1

Private Sub Command1_Click()
    Dim lRet As Long, lHnd As Long, lLen As Long
    Dim sKey As String, sData As String
   
    sKey = "software\microsoft\windows\currentversion\run"
   
    lRet = RegOpenKeyEx(HKEY_LOCAL_MACHINE, sKey, 0&, _
            KEY_SET_VALUE, lHnd)
                'If the key opened successfully.
    If lRet = 0 Then
            'The string sData is the command line used to start
            'the app, and includes any command line parameters.
        sData = "c:\mydir\myapp.exe"
        lLen = Len(sData)
            'The second argument (in my example, "MyApp") is
            'the name of the app, what would ordinarily appear
            'in the Caption Bar.  As far as I can tell, it does
            'nothing important in this process, except to assign
            'a name for the new entry under the RUN key.  It can
            'be used to easily delete this entry.
        lRet = RegSetValueEx(lHnd, "MyApp", 0&, REG_SZ, _
                ByVal sData, lLen)
    Else
        MsgBox "OpenKey failed."
    End If
    lRet = RegCloseKey(lHnd)
End Sub

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LVL 5

Accepted Solution

by:
fantasy1001 earned 50 total points
Comment Utility
The example below will demostrate how to save, open and delete a key in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

'Open a new form and add three button

Const REG_SZ = 1 ' Unicode nul terminated string
Const REG_BINARY = 3 ' Free form binary
Const HKEY_CURRENT_USER = &H80000001
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Private Declare Function RegCreateKey Lib "advapi32.dll" Alias "RegCreateKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Private Declare Function RegDeleteValue Lib "advapi32.dll" Alias "RegDeleteValueA" (ByVal hKey As Long, ByVal lpValueName As String) As Long
Private Declare Function RegOpenKey Lib "advapi32.dll" Alias "RegOpenKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Private Declare Function RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, lpData As Any, lpcbData As Long) As Long
Private Declare Function RegSetValueEx Lib "advapi32.dll" Alias "RegSetValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, ByVal dwType As Long, lpData As Any, ByVal cbData As Long) As Long

Function RegQueryStringValue(ByVal hKey As Long, ByVal strValueName As String) As String
    Dim lResult As Long, lValueType As Long, strBuf As String, lDataBufSize As Long
    'retrieve nformation about the key
    lResult = RegQueryValueEx(hKey, strValueName, 0, lValueType, ByVal 0, lDataBufSize)
    If lResult = 0 Then
        If lValueType = REG_SZ Then
            'Create a buffer
            strBuf = String(lDataBufSize, Chr$(0))
            'retrieve the key's content
            lResult = RegQueryValueEx(hKey, strValueName, 0, 0, ByVal strBuf, lDataBufSize)
            If lResult = 0 Then
                'Remove the unnecessary chr$(0)'s
                RegQueryStringValue = Left$(strBuf, InStr(1, strBuf, Chr$(0)) - 1)
            End If
        ElseIf lValueType = REG_BINARY Then
            Dim strData As Integer
            'retrieve the key's value
            lResult = RegQueryValueEx(hKey, strValueName, 0, 0, strData, lDataBufSize)
            If lResult = 0 Then
                RegQueryStringValue = strData
            End If
        End If
    End If
End Function

Function GetString(hKey As Long, strPath As String, strValue As String)
    Dim Ret
    'Open the key
    RegOpenKey hKey, strPath, Ret
    'Get the key's content
    GetString = RegQueryStringValue(Ret, strValue)
    'Close the key
    RegCloseKey Ret
End Function

Sub SaveString(hKey As Long, strPath As String, strValue As String, strData As String)
    Dim Ret
    'Create a new key
    RegCreateKey hKey, strPath, Ret
    'Save a string to the key
    RegSetValueEx Ret, strValue, 0, REG_SZ, ByVal strData, Len(strData)
    'close the key
    RegCloseKey Ret
End Sub

Sub SaveStringLong(hKey As Long, strPath As String, strValue As String, strData As String)
    Dim Ret
    'Create a new key
    RegCreateKey hKey, strPath, Ret
    'Set the key's value
    RegSetValueEx Ret, strValue, 0, REG_BINARY, CByte(strData), 4
    'close the key
    RegCloseKey Ret
End Sub

Sub DelSetting(hKey As Long, strPath As String, strValue As String)
    Dim Ret
    'Create a new key
    RegCreateKey hKey, strPath, Ret
    'Delete the key's value
    RegDeleteValue Ret, strValue
    'close the key
    RegCloseKey Ret
End Sub

Private Sub Command1_Click()
    Dim strString As String
    'Ask for a value
    strString = InputBox("Please enter a value between 0 and 255 to be saved as a binary value in the registry.", App.Title)
    If strString = "" Or Val(strString) > 255 Or Val(strString) < 0 Then
        MsgBox "Invalid value entered ...", vbExclamation + vbOKOnly, App.Title
        Exit Sub
    End If
    'Save the value to the registry
    SaveStringLong HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run, "test", "BinaryValue", CByte(strString)
End Sub

Private Sub Command2_Click()
    'Get a string from the registry
    Ret = GetString(HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run, "test", "BinaryValue")
    If Ret = "" Then MsgBox "No value found !", vbExclamation + vbOKOnly, App.Title: Exit Sub
    MsgBox "The value is " + Ret, vbOKOnly + vbInformation, App.Title
End Sub

Private Sub Command3_Click()
    'Delete the setting from the registry
    DelSetting HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run, "test", "BinaryValue"
    MsgBox "The value was deleted ...", vbInformation + vbOKOnly, App.Title
End Sub

Private Sub Form_Load()
    Command1.Caption = "Set Value"
    Command2.Caption = "Get Value"
    Command3.Caption = "Delete Value"
End Sub


Thanks,
~ fantasy ~
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