VB编程:ReleaseCapture&SendMessage拖动无标题栏的窗体-57

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VB编程:ReleaseCapture&SendMessage拖动无标题栏的窗体-57
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Private Declare Function ReleaseCapture Lib "user32" () As Long

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

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Const HTCAPTION = 2

Const WM_NCLBUTTONDOWN = &HA1   '161

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Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)

    Dim r As Long

    Dim i

    If Button = 1 Then

        i = ReleaseCapture()

        r = SendMessage(hwnd, WM_NCLBUTTONDOWN, HTCAPTION, 0)

    End If

End Sub