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small registry function

Posted on 2006-06-20
Last Modified: 2008-02-01

hello experts,

i am developing an application that has to be as small as possible,
but now i discover i need to write to the registry

what would be the smallest and most portable way?
Question by:Mark_FreeSoftware
  • 6
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LVL 26

Expert Comment

ID: 16941348
what do you mean by small?

Dim WSHShell
Set WSHShell = WScript.CreateObject("WScript.Shell")
WSHShell.RegWrite "HKCU\MyRegKey\", "Top level key"



Expert Comment

ID: 16942190

SaveSetting, GetSetting: are 2 functions used in vb6 mostly

SaveSetting= write to registry

GetSetting = read fro mregistry

SaveSetting "MyCompany\MyAppName", "Printers", "Pr1", "def printer"
SaveSetting "MyCompany", "MyAppName\Printers", "Pr1", "def printer"

Just be sure the args do ~not~ include leading or trailing delimiters.
VB does not filter them and the underlying registry Api chokes on

If you need to go beyond "HKEY_CURRENT_USER\Software\VB and VBA
Program Settings", then you'll need to use the registry Api. There are
a number of free reg classes and code, including one of the more popular at


LVL 29

Expert Comment

ID: 16942343
This depends, do you want to rely on scripting? Do you want to use API?

What exactly do you need? Do you need to write to a part of the registry that already exists or do you need to create your own key? Are you only saving values or are you going to need to query the values as well?

If you only need to write values than it can be done in 4-5 lines using API
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LVL 29

Assisted Solution

nffvrxqgrcfqvvc earned 250 total points
ID: 16943259
'Assuming you only want to write string values and or create a key to store your information in then API
'Its about 4 lines but how I format it looks larger.

Option Explicit

Private Declare Function RegCreateKeyExA Lib "advapi32" _
    (ByVal hKey As Long, _
    ByVal lpSubKey As String, _
    ByVal Reserved As Long, _
    ByVal lpClass As String, _
    ByVal dwOptions As Long, _
    ByVal samDesired As Long, _
    ByVal lpSecurityAttributes As Long, _
    phkResult As Long, _
    lpdwDisposition As Long) As Long

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

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

Public Enum PHKEY
    HKEY_CURRENT_USER = &H80000001
    HKEY_LOCAL_MACHINE = &H80000002
End Enum

Public Function WriteValue( _
    hKey As PHKEY, _
    sKey As String, _
    vName As String, _
    vData As String) As Long
    'Returns 11 - if key created and call successful
    'Returns 12 - if opened existing key and successful
    Dim h      As Long
    Dim dp   As Long

    If RegCreateKeyExA(hKey, sKey, _
        0&, 0&, 0&, &H3F, _
        0&, h, dp) = 0 Then
      If RegSetValueExA(h, vName, 0&, _
        1, vData, Len(vData)) = 0 Then
        WriteValue = 1 & dp
      End If
    End If
    RegCloseKey h
End Function

'--- Form1 -----

Dim Success As Long
    Success = WriteValue(HKEY_CURRENT_USER, _
        "Software\NEWKEY", _
        "name", _
        "data to write")
LVL 13

Author Comment

ID: 16943343

ok some more explanation:

by small i do mean as less bits as possible
(so i don't care about 100 lines code, i do care about the compiled size)

i only have to write to it (now)

most of the times i have to create new keys,
sometimes delete them

i want as few refereces as possible

i do now have references to:
kernel32 (copymem)
comdlg32l (getopenfilename)
user32 (region stuff,and sendmessage)
gdi32 (ExtCreateRegion)

do i have to include some dll for wscript?

@kaliyugkaarjun :
i have to go beyond the vb/vba key

and the vbaccelerator examples are great, but they are not really "small"
LVL 26

Expert Comment

ID: 16943440
>>do i have to include some dll for wscript?

no, it's already come with the system
LVL 13

Author Comment

ID: 16943483

maybey i am doing somthing wrong, but when i use the wscript example,
vb states that "WScript" is an unknow variable
LVL 26

Accepted Solution

EDDYKT earned 250 total points
ID: 16943879

try this

Dim WSHShell
Set WSHShell = CreateObject("WScript.Shell")
WSHShell.RegWrite "HKCU\MyRegKey\", "Top level key"
LVL 13

Author Comment

ID: 16944046

thank you!

that is indeed really small, but i don't understand it very good.

please see this question for exaplaining it a bit:

i am thinking about a split between eddykt (350)
and egl1044 (150)

is that ok for both of you?
LVL 29

Expert Comment

ID: 16944152
there both the same size in bytes
LVL 13

Author Comment

ID: 16944213

not really:

the wscript exe:
16.384 bytes

the api exe:
20.480 bytes

what i did to test it:

open a new default project
now doubleclick on the form to go to the Form_Load
for the wscript i pasted all the code in the form_load (3 lines)

for the api i pasted all code above the form load, exept for the last lines
(Dim Success As Long
    Success = WriteValue(HKEY_CURRENT_USER, _
        "Software\NEWKEY", _
        "name", _
        "data to write"))

compiled the first as wscript.exe
and the second as api.exe

and the filesize is different
LVL 29

Expert Comment

ID: 16944281
not if you put the code in a module
LVL 13

Author Comment

ID: 16944892

20.480 bytes when i put that code in a module

what are your compiler options?

i have it set to compile for small exe
LVL 29

Expert Comment

ID: 16945392
i get 16K for both but this is without using a form
LVL 13

Author Comment

ID: 16952568


then it's a even split between you and eddykt

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