用VB5讀寫注冊表實例

用VB5讀寫注冊表實例

首先新建一個工程，在新建的窗體上添加以下控件并設置相應屬性：
控件名 屬性 值
Label1 Caption 注冊表鍵值：
Label2 Caption 注冊姓名：
Label3 Caption 空
Label4 Caption 注冊公司：
Label5 Caption 空
Label6 Caption 空
Text1 Text 空
Text2 Text 空
Command1 Caption 寫入注冊表
Command2 Caption 退出
然后，在程序的聲明部分添加如下代碼：
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 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
Const error_success = 0&
Const error_baddb = 1009&
Const error_badkey = 1010&
Const error_cantopen = 1011&
Const error_cantread = 1012&
Const error_cantwrite = 1013&
Const error_registry_recovered = 1014&
Const error_registry_corrupt = 1015&
Const error_registry_io_failed = 1016&
Const hkey_classes_root = &H80000000
Const hkey_current_user = &H80000001
Const hkey_local_machine = &H80000002
Const REG_SZ = 1
Const regkey = "software\My Soft\My program"
接著為各個控件添加代碼，代碼如下：
Private Sub Command1_Click()
Dim keyvalue As String
Dim retvalue As Long
Dim keyid As Long
retvalue = RegCreateKey(h da0 key_local_machine, regkey, keyid)
keyvalue = Text1.Text
retvalue = RegSetValueEx(keyid, "注冊名", 0&, REG_SZ, ByVal keyvalue, Len(keyvalue) + 1)
keyvalue = Text2.Text
retvalue = RegSetValueEx(keyid, "注冊公司", 0&, REG_SZ, ByVal keyvalue, Len(keyvalue) + 1)
If Text1.Text <> "" And Text2.Text <> "" Then
Label3.Caption = Text1.Text
Label5.Caption = Text2.Text
End If
End Sub

Private Sub Command2_Click()
Unload Me
End
End Sub

Private Sub Form_Load()
Dim retvalue As Long
Dim result As Long
Dim keyid As Long
Dim keyvalue As String
Dim subkey As String
Dim bufsize As Long
Label6.Caption = regkey
retvalue = RegCreateKey(hkey_local_machine, regkey, keyid)
If retvalue = 0 Then
subkey = "注冊名"
retvalue = RegQueryValueEx(keyid, subkey, 0&, REG_SZ, 0&, bufsize)
If bufsize < 2 Then
keyvalue = ""
retvalue = RegSetValueEx(keyid, subkey, 0&, REG_SZ, ByVal keyvalue, Len(keyvalue) + 1)
Else
keyvalue = String(bufsize + 1, " ")
retvalue = RegQueryValueEx(keyid, subkey, 0&, REG_SZ, ByVal keyvalue, bufsize)
keyvalue = Left$(keyvalue, bufsize - 1)
Text1.Text = keyvalue
End If
Label3.Caption = keyvalue

subkey = "注冊公司"
retvalue = RegQueryValueEx(keyid, subkey, 0&, REG_SZ, 0&, bufsize)
If bufsize < 2 Then
keyvalue = ""
retvalue = RegSetValueEx(keyid, subkey, 0&, REG_SZ, ByVal keyvalue, Len(keyvalue) + 1)
Else
keyvalue = String(bufsize + 1, " ")
retvalue = RegQueryValueEx(keyid, subkey, 0&, REG_SZ, ByVal keyvalue, bufsize)
keyvalue = Left$(keyvalue, bufsize - 1)
Text2.Text = keyvalue
End If
Label5.Caption = keyvalue
End If
End Sub
好了，存盤，按F5運行程序，在兩個Text中分別寫入你的“注冊姓名”和“注冊公司”的名稱，然后單擊
“寫入注冊表”按鈕，現在打開“注冊表編輯器”，找到HKEY_LOCAL_MACHINE\SOFTWARE\My Soft\My Program，看看右邊是不是生成了“注冊名”和“注冊公司”兩個鍵值，是的話，恭喜你，你成功了。