利用API函数实现无TittleBar窗体的移动

Option Explicit

Const HTCAPTION = 2
Const WM_NCLBUTTONDOWN = &HA1
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 Long) As Long

Sub Form_MouseDown(Button As Integer, Shift As Integer, x As Single, Y As Single)
If Button = 1 Then ' Checking for Left Button only
Dim ReturnVal As Long
x = ReleaseCapture()
ReturnVal = SendMessage(hwnd, WM_NCLBUTTONDOWN, HTCAPTION, 0)
End If
End Sub