【CSDN】【如何控制窗体缩放到一定大小后不能再缩小】
Private Sub Form_Resize()
Frame1.Width = Me.ScaleWidth
Frame2.Width = Me.ScaleWidth
Frame3.Width = Me.ScaleWidth
Frame3.Height = Me.ScaleHeight - Frame1.Height - Frame2.Height
Frame2.Top = Frame1.Height
Frame3.Top = Frame1.Height + Frame2.Height
MSFlexGrid1.Left = 20
MSFlexGrid1.Width = Frame3.Width - 40
MSFlexGrid1.Height = Frame3.Height - 160
Label1.Left = Frame1.Width / 2 - Label1.Width / 2
End Sub
以上代码能够实现当窗体变化时，控件能够自动调整其自身大小和位置，可是现在我要控制如何使窗体缩小到一定大小时不能再缩小，因为缩小到只剩下标题栏，如下语句会出现错误，程序崩溃
Frame3.Height = Me.ScaleHeight - Frame1.Height - Frame2.Height
Frame3.Top = Frame1.Height + Frame2.Height
请问如何实现呀
问题点数：100、回复次数：6Top
1 楼wea1978（川）回复于 2003-11-02 17:21:06 得分 1
加上 if Frame3.Height< 数据 then exit sub
if Frame3.Top< 数据 then exit subTop
2 楼callzjy2（）回复于 2003-11-02 17:23:27 得分 20
Private Sub Form_Resize()
On Error Resume Next
Frame1.Width = Me.ScaleWidth
Frame2.Width = Me.ScaleWidth
Frame3.Width = Me.ScaleWidth
Frame3.Height = Me.ScaleHeight - Frame1.Height - Frame2.Height
Frame2.Top = Frame1.Height
Frame3.Top = Frame1.Height + Frame2.Height
MSFlexGrid1.Left = 20
MSFlexGrid1.Width = Frame3.Width - 40
MSFlexGrid1.Height = Frame3.Height - 160
Label1.Left = Frame1.Width / 2 - Label1.Width / 2
End Sub
Top
3 楼palmkey（原水）回复于 2003-11-02 18:38:04 得分 2
Private Sub Form_Resize()
'加上判断
If Me.WindowState = 1 Then '最小化
Exit Sub
End If
Frame1.Width = Me.ScaleWidth
Frame2.Width = Me.ScaleWidth
Frame3.Width = Me.ScaleWidth
Frame3.Height = Me.ScaleHeight - Frame1.Height - Frame2.Height
Frame2.Top = Frame1.Height
Frame3.Top = Frame1.Height + Frame2.Height
MSFlexGrid1.Left = 20
MSFlexGrid1.Width = Frame3.Width - 40
MSFlexGrid1.Height = Frame3.Height - 160
Label1.Left = Frame1.Width / 2 - Label1.Width / 2
End SubTop
4 楼hisofty（瘦马）回复于 2003-11-02 18:45:51 得分 10
上面的代码实际上是在窗体改变大小后再改回去，下面的代码是直接的禁止改变大小：
利用子类处理技术限制窗体的大小
' * * * * * * * * * * 警告 * * * * * * * * * * * * *
' 对以下代码进行修改将有可能导致不可预料的后果,甚至能使您的VB崩溃!
' 在VB IDE环境中运行本程序之前请先保存您的修改
' 不要使用断点调试模式,这将导致VB崩溃!
' * * * * * * * * * * 注意 * * * * * * * * * * * * *
模块:
Option Explicit
Public OldWindowProc As Long
Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
'从指定的窗口结构中取得信息
'参数/类型 说明
'hwnd(long): 欲为其获取信息的窗口的句柄
'nIndex(long): 欲取回的信息,可以是下述任何一个常数
'GWL_EXSTYLE:扩展窗口样式
'GWL_STYLE:窗口样式
'GWL_WNDPROC:该窗口的窗口函数的地址
'GWL_HINSTANCE:拥有窗口的实例的句柄
'GWL_HWNDPARENT:该窗口之父的句柄.不要用 SetWindowWord 来改变这个值
'GWL_ID:对话框中一个子窗口的标识符
'GWL_USERDATA:含义由应用程序规定
'对话框亦可指定下列常数
'DWL_DLGPROC:这个窗口的对话框函数地址
'DWL_MSGRESULT:在对话框函数中处理的一条消息返回的值
'DWL_USER:含义由应用程序规定
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
'在窗体结构中为指定的窗口设置信息
'参数/类型 说明
'hwnd(long) 欲为其获取信息的窗口的句柄
'nIndex(long) 参考GetWindowLong函数
'dwNewLong(long) 由nIndex指定的窗口信息的新值
Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (pDest As Any, pSource As Any, ByVal ByteLen As Long)
'这就是在VisualBasic中处理指针的"短柄斧"--CopyMemory.你可能在API文档中找不到它,但它确实存在,并且功能异常强大
'参数/类型 说明
'pDest 你想写入字节到其中的任何变量的ByRef参数(地址)
'pSource 要从其中进行复制的ByRef变量
'ByteLen 要复制的字节数
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
'把控制权传回给原来的窗口过程
Public Const WM_GETMINMAXINFO = &H24
Type POINTAPI
x As Long
y As Long
End Type
' This is the structure that is passed by reference(ByRef)(ie an address) to your message handler(消息侦听器)
' The key items in this structure are ptMinTrackSize and ptMaxTrackSize
Type MINMAXINFO
ptReserved As POINTAPI
ptMaxSize As POINTAPI
ptMaxPosition As POINTAPI
ptMinTrackSize As POINTAPI
ptMaxTrackSize As POINTAPI
End Type
Public Function SubClass1_WndMessage(ByVal hwnd As Long, ByVal Msg As Long, ByVal wp As Long, ByVal lp As Long) As Long
' Watch for the pertinent message to come in
If Msg = WM_GETMINMAXINFO Then
Dim MinMax As MINMAXINFO
' This is necessary because the structure was passed by its address and there
' is currently no intrinsic way to use an address in Visual Basic
CopyMemory MinMax, ByVal lp, Len(MinMax)
' This is where you set the values of the MinX,MinY,MaxX, and MaxY
' The values placed in the structure must be in pixels. The values
' normally used in Visual Basic are in twips. The conversion is as follows:
' pixels = twips\twipsperpixel
MinMax.ptMinTrackSize.x = 3975 \ Screen.TwipsPerPixelX
MinMax.ptMinTrackSize.y = 1740 \ Screen.TwipsPerPixelY
MinMax.ptMaxTrackSize.x = Screen.Width \ Screen.TwipsPerPixelX \ 2
MinMax.ptMaxTrackSize.y = 3480 \ Screen.TwipsPerPixelY
' Here we copy the datastructure back up to the address passed in the parameters
' because Windows will look there for the information.
CopyMemory ByVal lp, MinMax, Len(MinMax)
' This message tells Windows that the message was handled successfully
SubClass1_WndMessage = 1
Exit Function
End If
' Here, we forward all irrelevant messages on to the default message handler.
SubClass1_WndMessage = CallWindowProc(OldWindowProc, hwnd, Msg, wp, lp)
End Function
窗体代码:
Option Explicit
Private Const GWL_WNDPROC = (-4)
Private Sub Form_Load()
' First, we need to store the address of the existing Message Handler
OldWindowProc = GetWindowLong(Me.hwnd, GWL_WNDPROC)
' Now we can tell windows to forward all messages to out own Message Handler
Call SetWindowLong(Me.hwnd, GWL_WNDPROC, AddressOf SubClass1_WndMessage)
End Sub
Private Sub Form_Unload(Cancel As Integer)
' We must return control of the messages back to windows before the program exits
Call SetWindowLong(Me.hwnd, GWL_WNDPROC, OldWindowProc)
End SubTop
5 楼callzjy2（）回复于 2003-11-02 19:35:54 得分 65
Private Sub Form_Resize()
On Error Resume Next
If Me.ScaleWidth < 11000 Then Me.Width = 11000
If Me.ScaleHeight < 8250 Then Me.Height = 8250
Frame1.Width = Me.ScaleWidth
Frame2.Width = Me.ScaleWidth
Frame3.Width = Me.ScaleWidth
Frame3.Height = Me.ScaleHeight - Frame1.Height - Frame2.Height
Frame2.Top = Frame1.Height
Frame3.Top = Frame1.Height + Frame2.Height
MSFlexGrid1.Left = 20
MSFlexGrid1.Width = Frame3.Width - 40
MSFlexGrid1.Height = Frame3.Height - 160
Label1.Left = Frame1.Width / 2 - Label1.Width / 2
End Sub
Top
6 楼5653325（等待开刃的刀）回复于 2003-11-02 19:50:33 得分 2
用on error goto（resume next）就可以了吧Top
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