用窗体过程实现无标题栏窗体的移动.bas

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Attribute VB_Name = "Module1"
Option Explicit

Public Const GWL_WNDPROC = (-4)

Public Const WM_NCHITTEST = &H84
Public Const HTCLIENT = 1
Public Const HTCAPTION = 2

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
Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long) As Long
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Public prevWndProc As Long

Function WndProc(ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    WndProc = CallWindowProc(prevWndProc, hWnd, Msg, wParam, lParam)
    If Msg = WM_NCHITTEST And WndProc = HTCLIENT Then
        WndProc = HTCAPTION
    End If
End Function