最近在程序里新加了一个控制窗口到达一定尺寸时,拖动操作不管用的模块,没有用普通的方法处理,因为普通的方法会使窗口闪烁,难道是这个模块的原因?'控制窗体最小限定的代码 '新建一个标准模块. '代码如下 Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _ (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _ (ByVal hWnd As Long, ByVal nIndex As Long) As Long 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 Sub CopyMemory Lib "KERNEL32" Alias "RtlMoveMemory" ( _ lpvDest As Any, lpvSource As Any, ByVal cbCopy As Long) Public Const GWL_WNDPROC = (-4) Public Const WM_GETMINMAXINFO = &H24 Type POINTAPI x As Long y As Long End Type Type MINMAXINFO ptReserved As POINTAPI ptMaxSize As POINTAPI ptMaxPosition As POINTAPI ptMinTrackSize As POINTAPI ptMaxTrackSize As POINTAPI End Type Public preWinProc As Long Public Function wndproc(ByVal hWnd As Long, ByVal Msg As Long, _ ByVal wParam As Long, ByVal lParam As Long) As Long Dim lwd As Long, hwd As Long If Msg = WM_GETMINMAXINFO Then Dim maxmin As MINMAXINFO CopyMemory maxmin, ByVal lParam, Len(maxmin) 'maxmin.ptMaxTrackSize.x = 1000 '设定最大Resize的宽度 'maxmin.ptMaxTrackSize.y = 800'设定最大Resize的高度 maxmin.ptMinTrackSize.x = 800 '设定最小Resize的宽度 maxmin.ptMinTrackSize.y = 600 '设定最小Resize的高度 CopyMemory ByVal lParam, maxmin, Len(maxmin) Else wndproc = CallWindowProc(preWinProc, hWnd, Msg, wParam, lParam) End If End Function
然后在load 和unload 里有如下代码 Private Sub MDIForm_Load() frmSplash.Show DoEvents Call MDIfrmMainInit TimerMain.Enabled = True Unload frmSplash'控制窗体最小限定的代码 Dim ret As Long preWinProc = GetWindowLong(Me.hWnd, GWL_WNDPROC) ret = SetWindowLong(Me.hWnd, GWL_WNDPROC, AddressOf wndproc) '控制窗体最小限定的代码 End SubPrivate Sub MDIForm_Unload(Cancel As Integer) TimerMain.Enabled = False '控制窗体最小限定的代码 Dim ret As Long ret = SetWindowLong(Me.hWnd, GWL_WNDPROC, preWinProc) '控制窗体最小限定的代码 End Sub
是否用了api直接操控内存?
我只遇到过这2种直接退出的情况。
其他还有什么会导致,就不知道了
建议用if语句,或错误捕捉.
'新建一个标准模块.
'代码如下
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
(ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _
(ByVal hWnd As Long, ByVal nIndex As Long) As Long
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 Sub CopyMemory Lib "KERNEL32" Alias "RtlMoveMemory" ( _
lpvDest As Any, lpvSource As Any, ByVal cbCopy As Long)
Public Const GWL_WNDPROC = (-4)
Public Const WM_GETMINMAXINFO = &H24
Type POINTAPI
x As Long
y As Long
End Type
Type MINMAXINFO
ptReserved As POINTAPI
ptMaxSize As POINTAPI
ptMaxPosition As POINTAPI
ptMinTrackSize As POINTAPI
ptMaxTrackSize As POINTAPI
End Type
Public preWinProc As Long Public Function wndproc(ByVal hWnd As Long, ByVal Msg As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long
Dim lwd As Long, hwd As Long
If Msg = WM_GETMINMAXINFO Then
Dim maxmin As MINMAXINFO
CopyMemory maxmin, ByVal lParam, Len(maxmin)
'maxmin.ptMaxTrackSize.x = 1000 '设定最大Resize的宽度
'maxmin.ptMaxTrackSize.y = 800'设定最大Resize的高度
maxmin.ptMinTrackSize.x = 800 '设定最小Resize的宽度
maxmin.ptMinTrackSize.y = 600 '设定最小Resize的高度
CopyMemory ByVal lParam, maxmin, Len(maxmin)
Else
wndproc = CallWindowProc(preWinProc, hWnd, Msg, wParam, lParam)
End If
End Function
Private Sub MDIForm_Load()
frmSplash.Show
DoEvents
Call MDIfrmMainInit
TimerMain.Enabled = True
Unload frmSplash'控制窗体最小限定的代码
Dim ret As Long
preWinProc = GetWindowLong(Me.hWnd, GWL_WNDPROC)
ret = SetWindowLong(Me.hWnd, GWL_WNDPROC, AddressOf wndproc)
'控制窗体最小限定的代码
End SubPrivate Sub MDIForm_Unload(Cancel As Integer)
TimerMain.Enabled = False
'控制窗体最小限定的代码
Dim ret As Long
ret = SetWindowLong(Me.hWnd, GWL_WNDPROC, preWinProc)
'控制窗体最小限定的代码
End Sub
不信就把setwindowslong,getwindowslong三句注释掉,保准出错也不会直接退出ide了。如果消息的制造者是自己的另一个程序,那倒可以把消息替换成不常用的事件,然后在事件里面写处理代码。这个方法我屡试不爽,环保又卫生。
但如果无法控制消息产生,比如要实现鼠标在非标题区也能拖动窗体,就没法了。