module1.bas

此小程序可以根据IP地址

Attribute VB_Name = "Module1"
Option Explicit
Private Type RECT
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type
Private Declare Function GetParent Lib "user32" _
    (ByVal hWnd As Long) As Long
Private Declare Function GetWindowLong Lib "user32" Alias _
    "GetWindowLongA" (ByVal hWnd As Long, _
    ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias _
    "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long, _
    ByVal dwNewLong As Long) As Long
Private Const GWL_WNDPROC = (-4)
Private Declare Function GetProp Lib "user32" Alias "GetPropA" _
    (ByVal hWnd As Long, ByVal lpString As String) As Long
Private Declare Function SetProp Lib "user32" Alias "SetPropA" _
    (ByVal hWnd As Long, ByVal lpString As String, _
    ByVal hData As Long) As Long
Private Declare Function RemoveProp Lib "user32" Alias _
    "RemovePropA" (ByVal hWnd As Long, _
    ByVal lpString As String) As Long
Private Declare Function CallWindowProc Lib "user32" Alias _
    "CallWindowProcA" (ByVal lpPrevWndFunc As Long, _
    ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, _
    ByVal lParam As Long) As Long

Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
    (Destination As Any, Source As Any, ByVal Length As Long)

'Owner draw constants
Private Const ODT_BUTTON = 4
Private Const ODS_SELECTED = &H1
'Window messages we're using
Private Const WM_DESTROY = &H2
Private Const WM_DRAWITEM = &H2B

Private Type DRAWITEMSTRUCT
    CtlType As Long
    CtlID As Long
    itemID As Long
    itemAction As Long
    itemState As Long
    hwndItem As Long
    hDC As Long
    rcItem As RECT
    itemData As Long
End Type

Private Declare Function GetWindowText Lib "user32" Alias _
    "GetWindowTextA" (ByVal hWnd As Long, ByVal lpString As String, _
    ByVal cch As Long) As Long
'Various GDI painting-related functions
Private Declare Function DrawText Lib "user32" Alias "DrawTextA" _
    (ByVal hDC As Long, ByVal lpStr As String, ByVal nCount As Long, _
    lpRect As RECT, ByVal wFormat As Long) As Long
Private Declare Function SetTextColor Lib "gdi32" (ByVal hDC As Long, _
    ByVal crColor As Long) As Long
Private Declare Function SetBkMode Lib "gdi32" (ByVal hDC As Long, _
    ByVal nBkMode As Long) As Long
Private Const TRANSPARENT = 1

Private Const DT_CENTER = &H1
Public Enum TextVAligns
    DT_VCENTER = &H4
    DT_BOTTOM = &H8
End Enum
Private Const DT_SINGLELINE = &H20


Private Sub DrawButton(ByVal hWnd As Long, ByVal hDC As Long, _
rct As RECT, ByVal nState As Long)

    Dim s As String
    Dim va As TextVAligns

    va = GetProp(hWnd, "VBTVAlign")

    'Prepare DC for drawing
    SetBkMode hDC, TRANSPARENT
    SetTextColor hDC, GetProp(hWnd, "VBTForeColor")

    'Prepare a text buffer
    s = String$(255, 0)
    'What should we print on the button?
    GetWindowText hWnd, s, 255
    'Trim off nulls
    s = Left$(s, InStr(s, Chr$(0)) - 1)

    If va = DT_BOTTOM Then
        'Adjust specially for VB's CommandButton control
        rct.Bottom = rct.Bottom - 4
    End If

    If (nState And ODS_SELECTED) = ODS_SELECTED Then
        'Button is in down state - offset
        'the text
        rct.Left = rct.Left + 1
        rct.Right = rct.Right + 1
        rct.Bottom = rct.Bottom + 1
        rct.Top = rct.Top + 1
    End If

    DrawText hDC, s, Len(s), rct, DT_CENTER Or DT_SINGLELINE _
        Or va

End Sub

Public Function ExtButtonProc(ByVal hWnd As Long, _
ByVal wMsg As Long, ByVal wParam As Long, _
ByVal lParam As Long) As Long

Dim lOldProc As Long
Dim di As DRAWITEMSTRUCT

lOldProc = GetProp(hWnd, "ExtBtnProc")

ExtButtonProc = CallWindowProc(lOldProc, hWnd, wMsg, wParam, lParam)

If wMsg = WM_DRAWITEM Then
    CopyMemory di, ByVal lParam, Len(di)
    If di.CtlType = ODT_BUTTON Then
        If GetProp(di.hwndItem, "VBTCustom") = 1 Then
            DrawButton di.hwndItem, di.hDC, di.rcItem, _
                di.itemState

        End If

    End If

ElseIf wMsg = WM_DESTROY Then
    ExtButtonUnSubclass hWnd
End If
End Function
Public Sub ExtButtonSubclass(hWndForm As Long)
Dim l As Long
l = GetProp(hWndForm, "ExtBtnProc")
If l <> 0 Then
    'Already subclassed
    Exit Sub
End If
SetProp hWndForm, "ExtBtnProc", GetWindowLong(hWndForm, GWL_WNDPROC)
SetWindowLong hWndForm, GWL_WNDPROC, AddressOf ExtButtonProc
End Sub
Public Sub ExtButtonUnSubclass(hWndForm As Long)
Dim l As Long
l = GetProp(hWndForm, "ExtBtnProc")
If l = 0 Then
    'Isn't subclassed
    Exit Sub
End If
SetWindowLong hWndForm, GWL_WNDPROC, l
RemoveProp hWndForm, "ExtBtnProc"
End Sub
Public Sub SetButton(ByVal hWnd As Long, ByVal lForeColor As Long, Optional ByVal VAlign As TextVAligns = DT_VCENTER)
    Dim hWndParent As Long
    hWndParent = GetParent(hWnd)
    If GetProp(hWndParent, "ExtBtnProc") = 0 Then
        ExtButtonSubclass hWndParent
    End If
    SetProp hWnd, "VBTCustom", 1
    SetProp hWnd, "VBTForeColor", lForeColor
    SetProp hWnd, "VBTVAlign", VAlign
End Sub
Public Sub RemoveButton(ByVal hWnd As Long)
    RemoveProp hWnd, "VBTCustom"
    RemoveProp hWnd, "VBTForeColor"
    RemoveProp hWnd, "VBTVAlign"
End Sub