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點(diǎn)擊菜單:項(xiàng)目=》添加引用 彈出窗口后選擇“COM”項(xiàng),然后找到你要加載的控件。

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記得先調(diào)用CMD使用 regsvr32 注冊(cè)你準(zhǔn)備加載的控件哈。
Private WithEvents NewTextBox As TextBox
'通過(guò)使用WithEvents關(guān)鍵字聲明一個(gè)對(duì)象變量為新的命令按鈕
Private Sub Command1_Click()
If NewTextBox Is Nothing Then
Set NewTextBox = Controls.Add("VB.TextBox", "cmdNew", Form1)
NewTextBox.Move 200, 200
NewTextBox.Width = Form1.Width - 450
NewTextBox.Height = Form1.Height - 1400
NewTextBox.Visible = True
End If
End Sub
Private Sub Command2_Click()
If NewTextBox Is Nothing Then
Exit Sub
Else
Controls.Remove NewTextBox
Set NewTextBox = Nothing
End If
End Sub
mytest1是繼承自什么類(lèi),通常應(yīng)該繼承自UerControl,雖然你這樣也能編譯通過(guò),但實(shí)際上沒(méi)有任何意義。所以你先改了再說(shuō)。繼承之后,編譯,工具箱就會(huì)多這么個(gè)控件,拖動(dòng)到Form1上,這樣按鈕下就不用再new了。然后你再來(lái)問(wèn)。
Public Class UserControl1
#Region "變量"
Dim Down_Color As Color = Color.Blue
Dim UP_Color As Color = Color.Gray
Dim Mode As Short = 0
Dim flag As Boolean
Dim offset_X As Integer
Dim offset_Y As Integer
Dim Mouse_P As Point
#End Region
#Region "屬性"
'按下顏色
Public Property _DownColor As Color
Get
Return Down_Color
End Get
Set(ByVal value As Color)
Down_Color = value
End Set
End Property
'彈起顏色
Public Property _UpColor As Color
Get
Return UP_Color
End Get
Set(ByVal value As Color)
UP_Color = value
End Set
End Property
'滑動(dòng)模式 0-橫 1-豎
Public Property _Mode As Short
Get
Return Mode
End Get
Set(ByVal value As Short)
Mode = value
End Set
End Property
#End Region
Private Sub UserControl1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.BackColor = UP_Color
End Sub
'鼠標(biāo)按下
Private Sub UserControl1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
Me.BackColor = Down_Color
Mouse_P = e.Location
flag = True
End Sub
'鼠標(biāo)移動(dòng)
Private Sub UserControl1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
If flag = False Then Exit Sub
Select Case Mode
Case 0 '橫向·
offset_X = e.X - Mouse_P.X
If Me.Location.X + offset_X + Me.Width = Me.ParentForm.Width Or Me.Location.X + offset_X = 0 Then
flag = False
Else
Me.Location = New Point(Me.Location.X + offset_X, Me.Location.Y)
End If
Case 1 '豎向·
offset_Y = e.Y - Mouse_P.Y
If Me.Location.Y + offset_Y + Me.Height + 30 = Me.ParentForm.Height Or Me.Location.Y + offset_Y = 0 Then
flag = False
Else
Me.Location = New Point(Me.Location.X, Me.Location.Y + offset_Y)
End If
End Select
End Sub
'鼠標(biāo)彈起
Private Sub UserControl1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp
Me.BackColor = UP_Color
flag = False
End Sub
End Class
首先你的問(wèn)題不太清楚,按照我的理解回答吧,你可以直接隱藏控件,然后在合適的時(shí)候顯示。估計(jì)是理解錯(cuò)誤。
給你舉個(gè)簡(jiǎn)單的例吧
for()語(yǔ)句:
int i;
for(i=0;i=100;i++)
printf("%d",i);
意思是只要i=0叫做初值,100叫做終值 i++表示什么意思應(yīng)該知道吧!此時(shí)的步長(zhǎng)為1;要是i+=2時(shí)步長(zhǎng)為2.
在本語(yǔ)句中i=0只在一開(kāi)始的時(shí)候起了作用。以后無(wú)用。i在0和100之間(包含100)輸出i的值。當(dāng)i=100時(shí)輸出100,此時(shí)i仍執(zhí)行++的動(dòng)作,這就是說(shuō)每次printf后先++在判斷i和100的關(guān)系。
也可以變行為:
int i=1;
for(;i=100;i++)
printf("%d",i);
或者
int i=1;
for(i=0;i=100;)
{
printf("%d",i);
i++;
}等等
其中for(;;)等價(jià)于while(1)
其實(shí)for語(yǔ)句等都可以用while等其他語(yǔ)句實(shí)現(xiàn)?。。。?!