vb中Form位置怎么变的

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VB中窗体启动位置怎么设置~

1,运行Microsoft Visual Basic程序 。
2,选择右边的窗体布局,右键点击 窗体 ,弹出菜单。

3,选择 启动位置 ,可以选择:手工,所有者中心,屏幕中心,Windows缺省。

不能直接通过属性框修改按钮中文本的颜色
根本没有foreColor属性
下边是一个参考方法
首先请把要改的按钮的Style设置为1

在工程中添加以下模块(Module):
Module modExtButton.bas

Option Explicit

'==================================================================
' modExtButton.bas
'
' 本模块可让你改变命令按钮的文本颜色。
' 使用方法:
'
' - 在设计时将文本的Style设为Graphical.
'
' - 随意设定背景色和图象属性.
'
' - 在Form_Load中调用 SetButton :
' SetButton Command1.hWnd, vbBlue
' (你可以任意次的调用该过程甚至不必先调用 RemoveButton.)
'
' - 在Form_Unload中调用 RemoveButton :
' RemoveButton Command1.hWnd
'
'==================================================================

Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type

Private Declare Function GetParent Lib "user32" _
(ByVal hWnd As Long) As Long

Private 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 Const GWL_WNDPROC = (-4)

Private Declare Function GetProp Lib "user32" Alias "GetPropA" _
(ByVal hWnd As Long, ByVal lpString As String) As Long
Private Declare Function SetProp Lib "user32" Alias "SetPropA" _
(ByVal hWnd As Long, ByVal lpString As String, _
ByVal hData As Long) As Long
Private Declare Function RemoveProp Lib "user32" Alias _
"RemovePropA" (ByVal hWnd As Long, _
ByVal lpString As String) As Long

Private 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

Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
(Destination As Any, Source As Any, ByVal Length As Long)

'Owner draw constants
Private Const ODT_BUTTON = 4
Private Const ODS_SELECTED = &H1
'Window messages we're using
Private Const WM_DESTROY = &H2
Private Const WM_DRAWITEM = &H2B

Private Type DRAWITEMSTRUCT
CtlType As Long
CtlID As Long
itemID As Long
itemAction As Long
itemState As Long
hwndItem As Long
hDC As Long
rcItem As RECT
itemData As Long
End Type

Private Declare Function GetWindowText Lib "user32" Alias _
"GetWindowTextA" (ByVal hWnd As Long, ByVal lpString As String, _
ByVal cch As Long) As Long
'Various GDI painting-related functions
Private Declare Function DrawText Lib "user32" Alias "DrawTextA" _
(ByVal hDC As Long, ByVal lpStr As String, ByVal nCount As Long, _
lpRect As RECT, ByVal wFormat As Long) As Long
Private Declare Function SetTextColor Lib "gdi32" (ByVal hDC As Long, _
ByVal crColor As Long) As Long
Private Declare Function SetBkMode Lib "gdi32" (ByVal hDC As Long, _
ByVal nBkMode As Long) As Long
Private Const TRANSPARENT = 1

Private Const DT_CENTER = &H1
Public Enum TextVAligns
DT_VCENTER = &H4
DT_BOTTOM = &H8
End Enum
Private Const DT_SINGLELINE = &H20


Private Sub DrawButton(ByVal hWnd As Long, ByVal hDC As Long, _
rct As RECT, ByVal nState As Long)

Dim s As String
Dim va As TextVAligns

va = GetProp(hWnd, "VBTVAlign")

'Prepare DC for drawing
SetBkMode hDC, TRANSPARENT
SetTextColor hDC, GetProp(hWnd, "VBTForeColor")

'Prepare a text buffer
s = String$(255, 0)
'What should we print on the button?
GetWindowText hWnd, s, 255
'Trim off nulls
s = Left$(s, InStr(s, Chr$(0)) - 1)

If va = DT_BOTTOM Then
'Adjust specially for VB's CommandButton control
rct.Bottom = rct.Bottom - 4
End If

If (nState And ODS_SELECTED) = ODS_SELECTED Then
'Button is in down state - offset
'the text
rct.Left = rct.Left + 1
rct.Right = rct.Right + 1
rct.Bottom = rct.Bottom + 1
rct.Top = rct.Top + 1
End If

DrawText hDC, s, Len(s), rct, DT_CENTER Or DT_SINGLELINE _
Or va

End Sub

Public Function ExtButtonProc(ByVal hWnd As Long, _
ByVal wMsg As Long, ByVal wParam As Long, _
ByVal lParam As Long) As Long

Dim lOldProc As Long
Dim di As DRAWITEMSTRUCT

lOldProc = GetProp(hWnd, "ExtBtnProc")

ExtButtonProc = CallWindowProc(lOldProc, hWnd, wMsg, wParam, lParam)

If wMsg = WM_DRAWITEM Then
CopyMemory di, ByVal lParam, Len(di)
If di.CtlType = ODT_BUTTON Then
If GetProp(di.hwndItem, "VBTCustom") = 1 Then
DrawButton di.hwndItem, di.hDC, di.rcItem, _
di.itemState

End If

End If

ElseIf wMsg = WM_DESTROY Then
ExtButtonUnSubclass hWnd

End If

End Function

Public Sub ExtButtonSubclass(hWndForm As Long)

Dim l As Long

l = GetProp(hWndForm, "ExtBtnProc")
If l 0 Then
'Already subclassed
Exit Sub
End If

SetProp hWndForm, "ExtBtnProc", _
GetWindowLong(hWndForm, GWL_WNDPROC)
SetWindowLong hWndForm, GWL_WNDPROC, AddressOf ExtButtonProc

End Sub

Public Sub ExtButtonUnSubclass(hWndForm As Long)

Dim l As Long

l = GetProp(hWndForm, "ExtBtnProc")
If l = 0 Then
'Isn't subclassed
Exit Sub
End If

SetWindowLong hWndForm, GWL_WNDPROC, l
RemoveProp hWndForm, "ExtBtnProc"

End Sub

Public Sub SetButton(ByVal hWnd As Long, _
ByVal lForeColor As Long, _
Optional ByVal VAlign As TextVAligns = DT_VCENTER)

Dim hWndParent As Long

hWndParent = GetParent(hWnd)
If GetProp(hWndParent, "ExtBtnProc") = 0 Then
ExtButtonSubclass hWndParent
End If

SetProp hWnd, "VBTCustom", 1
SetProp hWnd, "VBTForeColor", lForeColor
SetProp hWnd, "VBTVAlign", VAlign

End Sub

Public Sub RemoveButton(ByVal hWnd As Long)

RemoveProp hWnd, "VBTCustom"
RemoveProp hWnd, "VBTForeColor"
RemoveProp hWnd, "VBTVAlign"

End Sub




然后回到FORM中:
添加CommandButton,不必更改它们的名称,将它们的Style设为Graphical,给第3个按钮设置一幅图片。
CommandButton也可以放置在一个容器如PictureBox或Frame中,模块会判断,如果需要的话将CommandButton的容器也子类化。


在Form中的代码:
Private Sub Form_Load()

'Initialize each button color.
SetButton Command1.hWnd, vbRed
SetButton Command2.hWnd, &H8000& '深绿色
'Assign this one a DT_BOTTOM alignment because
SetButton Command3.hWnd, vbBlue, DT_BOTTOM '含有图片,将文本放置在按钮底部
SetButton Command4.hWnd, &H8080& '暗棕黄色

End Sub

Private Sub Form_Unload(Cancel As Integer)

'手动解除按钮的子类化
'这并不是必须的
RemoveButton Command1.hWnd
RemoveButton Command2.hWnd
RemoveButton Command3.hWnd
RemoveButton Command4.hWnd

End Sub

For m = 0 To 9
SetButton CmdNum(m).hWnd, vbBlue
Next
For n = 1 To 4
SetButton CmdCal(n).hWnd, vbRed
Next
For l = 2 To 4
SetButton CmdOth(l).hWnd, vbRed
Next

在设计程序的时候,我们通常会在程序初始化的时候设置窗口的位置,比如我们会form1.top=0,form1.left=0来设置窗口出现在屏幕的左上方。但是这种方法是用像素来控制的,对于像素这概念也许很多人都不是很清楚,不便于我们控制窗口的位置。那么还有别的方法吗?

有,我们还可以使用Screen对象来控制窗口在屏幕上的位置,比如我们要设置窗口出现在屏幕的正中央,就可以使用语句form1.width=screen.width/2,form1.height=screen.height/2来实现,其中width属性返回整个屏幕的宽度,height属性返回整个屏幕的高度,它的好处就是可以根据数值来调整窗体,便于控制。

可能中毒了,杀毒吧.或者关机重启看看.


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