Question

VB鼠标拖动控件改变大小

如何使 程序在运行 能通过 鼠标 改变其大小 就像 设计时那样可以调整 请给出具体代码 可移植 注释讲明白点

Answer 1

有句柄的好办，可以使用getwindowlong,SetWindowLong api,没句柄的就不好办了下面是一个运行时改picturebox大小的例子，你可以参考下Private Const GWL_STYLE = (-16)
Private Const WS_THICKFRAME = &H40000
Private Const SWP_NOSIZE = &H1
Private Const SWP_NOZORDER = &H4
Private Const SWP_NOMOVE = &H2
Private Const SWP_DRAWFRAME = &H20Private 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 Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
'函数定义
Private Sub ControlSize(ControlName As Control, SetTrue As Boolean)
Dim dwStyle As Long
dwStyle = GetWindowLong(ControlName.hwnd, GWL_STYLE)
If SetTrue Then
dwStyle = dwStyle Or WS_THICKFRAME
Else
dwStyle = dwStyle - WS_THICKFRAME
End If
dwStyle = SetWindowLong(ControlName.hwnd, GWL_STYLE, dwStyle)
SetWindowPos ControlName.hwnd, ControlName.Parent.hwnd, 0, 0, 0, 0, SWP_NOZORDER Or SWP_NOSIZE Or SWP_NOMOVE Or SWP_DRAWFRAME
End Sub'调用
Private Sub Form_Load()
ControlSize Line1, True
End Sub