VB.net怎样按住鼠标移动无边框窗体

1.在mouse事件中实现

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2.调用windows API

实现方式为：

1.在mouse事件中实现

[csharp] view plain copy

Point mouseOff;//鼠标移动位置变量

bool leftFlag;//标签是否为左键

private void groupControl1_MouseUp(object sender, MouseEventArgs e)

{

if (leftFlag)

{

leftFlag = false;//释放鼠标后标注为false;

}

}

private void groupControl1_MouseMove(object sender, MouseEventArgs e)

{

if (leftFlag)

{

Point mouseSet = Control.MousePosition;

mouseSet.Offset(mouseOff.X, mouseOff.Y); //设置移动后的位置

Location = mouseSet;

}

}

private void groupControl1_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

mouseOff = new Point(-e.X, -e.Y); //得到变量的值

leftFlag = true; //点击左键按下时标注为true;

}

}

private void groupControl1_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

mouseOff = new Point(-e.X, -e.Y); //得到变量的值

leftFlag = true; //点击左键按下时标注为true;

}

}

2.调用windows API

调用前需要添加using System.Runtime.InteropServices;

[csharp] view plain copy

[DllImport("user32.dll")]

public static extern bool ReleaseCapture();

[DllImport("user32.dll")]

public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

private void groupControl1_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

ReleaseCapture(); //释放鼠标捕捉

//发送左键点击的消息至该窗体(标题栏)

SendMessage(Handle, 0xA1, 0x02, 0);

}

}

您好，vb.net 在控件加载过程中，有一个窗体挡住，类似进度条，请问如何实现

分析：

添加一个新窗体，设置属性.TopMost=True ,窗体显示在前面。

设置一下透明度增加效果。如果使用窗体闪烁，可以添加时间控件，

设置时间段变更窗体透明度来达到你想要的效果。

vb制作的屏保系统，由多张图片循环播放，如何在图片播放时加上一定的特效，比如百叶窗等等，就像PPT制作的

'这个拿去试一试,两个时钟,两个图片框,自己设定图片框2的大小,比如让它和窗体一样大

'查一查PaintPicture的用法,就明白了

'去掉Picture2

Dim Pic_num As Long

Dim Pic_name() As String

Dim pic_star As Long

Dim p_width As Single

Dim p_height As Single

Dim bili_w As Single

Dim bili_h As Single

Dim v_mod As Long

Private Sub Form_Load()

Dim L_name As String

Pic_num = 0

ReDim Pic_name(Pic_num)

L_name = Dir(App.Path "\pic\*.JPG")

Do While L_name ""

ReDim Preserve Pic_name(Pic_num)

Pic_name(Pic_num) = L_name

Pic_num = Pic_num + 1

L_name = Dir

Loop

L_name = Dir(App.Path "\pic\*.BMP")

Do While L_name ""

ReDim Preserve Pic_name(Pic_num)

Pic_name(Pic_num) = L_name

Pic_num = Pic_num + 1

L_name = Dir

Loop

Picture1.AutoSize = True

Picture1.AutoRedraw = True

Picture1.Visible = False

' Me.AutoSize = False

Me.AutoRedraw = True

Me.Visible = True

Timer1.Interval = 10

Timer1.Enabled = False

Timer2.Interval = 50

Timer2.Enabled = False

If Pic_num 0 Then

Picture1.Picture = LoadPicture(App.Path "\pic\" Pic_name(0))

Me.PaintPicture Picture1.Picture, 0, 0, Me.ScaleWidth, Me.ScaleHeight, 0, 0, Picture1.ScaleWidth, Picture1.ScaleHeight

Timer1.Enabled = True

Timer1.Interval = 2000

Else

MsgBox ("没有图片显示！")

End If

End Sub

Private Sub Form_Resize()

Me.Width = Me.Width

Me.Height = Me.Width

Me.Top = 0

Me.Left = 0

End Sub

Private Sub Timer1_Timer()

Dim L_id As Long

Randomize

L_id = Int((Pic_num) * Rnd)

Picture1.Picture = LoadPicture(App.Path "\pic\" Pic_name(L_id))

bili_w = Picture1.ScaleWidth / Me.ScaleWidth

bili_h = Picture1.ScaleHeight / Me.ScaleHeight

p_width = Me.Width / 100

p_height = Me.Height / 100

pic_star = 0

Randomize

v_mod = Int(10 * Rnd)

'v_mod = 9'取消单引号并修改常数数可看单一效果

Timer1.Enabled = False

Timer2.Enabled = True

End Sub

Private Sub Timer2_Timer()

If pic_star 101 Then

pic_star = pic_star + 1

Select Case v_mod

Case 0

Me.PaintPicture Picture1.Picture, 0, 0, Me.Width, pic_star * p_height, 0, 0, Picture1.Width, bili_h * pic_star * p_height '从上向下

Case 1

Me.PaintPicture Picture1.Picture, 0, 0, pic_star * p_width, Me.Height, 0, 0, bili_w * pic_star * p_width, Picture1.Height '从左向右

Case 2

Me.PaintPicture Picture1.Picture, 0, 0, Me.Width, pic_star * p_height, 0, 0, Picture1.Width, Picture1.Height '压缩的从上向下

Case 3

Me.PaintPicture Picture1.Picture, 0, 0, pic_star * p_width, Me.Height, 0, 0, Picture1.Width, Picture1.Height '压缩的从左向右

Case 4

Me.PaintPicture Picture1.Picture, 0, 0, pic_star * p_width, pic_star * p_height, 0, 0, Picture1.Width, Picture1.Height '压缩的从左上向右下

Case 5

Me.PaintPicture Picture1.Picture, Me.Width - pic_star * p_width, Me.Height - pic_star * p_height, pic_star * p_width, pic_star * p_height, 0, 0, Picture1.Width, Picture1.Height '压缩的从右下向左上

Case 6

Me.PaintPicture Picture1.Picture, Me.Width / 2 - pic_star * p_width / 2, 0, pic_star * p_width / 2, Me.Height, 0, 0, Picture1.Width / 2, Picture1.Height '压缩的从中向左

Me.PaintPicture Picture1.Picture, Me.Width / 2, 0, pic_star * p_width, Me.Height, Picture1.Width / 2, 0, Picture1.Width, Picture1.Height '压缩的从中向右

Case 7

Me.PaintPicture Picture1.Picture, 0, Me.Height / 2 - pic_star * p_height / 2, Me.Width, pic_star * p_height / 2, 0, 0, Picture1.Width, Picture1.Height / 2 '压缩的从中向上

Me.PaintPicture Picture1.Picture, 0, Me.Height / 2, Me.Width, pic_star * p_height, 0, Picture1.Height / 2, Picture1.Width, Picture1.Height '压缩的从中向下

Case 8

Me.PaintPicture Picture1.Picture, Me.Width / 2 - pic_star * p_width / 2, Me.Height / 2 - pic_star * p_height / 2, pic_star * p_width / 2, pic_star * p_height / 2, 0, 0, Picture1.Width / 2, Picture1.Height / 2 '压缩的从中向左上

Me.PaintPicture Picture1.Picture, Me.Width / 2, Me.Height / 2, pic_star * p_width, pic_star * p_height, Picture1.Width / 2, Picture1.Height / 2, Picture1.Width, Picture1.Height '压缩的从中向右下

Me.PaintPicture Picture1.Picture, Me.Width / 2, Me.Height / 2 - pic_star * p_height / 2, pic_star * p_width / 2, pic_star * p_height / 2, Picture1.Width / 2, 0, Picture1.Width / 2, Picture1.Height / 2 '压缩的从中向右上

Me.PaintPicture Picture1.Picture, Me.Width / 2 - pic_star * p_width / 2, Me.Height / 2, pic_star * p_width / 2, pic_star * p_height / 2, 0, Picture1.Height / 2, Picture1.Width / 2, Picture1.Height / 2 '压缩的从中向左下

Case 9

For k = 0 To 9

Me.PaintPicture Picture1.Picture, 0, k * Me.Height / 10, Me.Width, 5 * pic_star * p_height / 10, 0, k * (Picture1.Height / 10), Picture1.Width, (Picture1.Height / 10) '水平百叶窗

Next

If pic_star = 21 Then

pic_star = 101

End If

End Select

Else

pic_star = 0

Timer1.Enabled = True

Me.PaintPicture Picture1.Picture, 0, 0, Me.ScaleWidth, Me.ScaleHeight, 0, 0, Picture1.ScaleWidth, Picture1.ScaleHeight

Timer2.Enabled = False

End If

End Sub

'这回做了9个,应该明白了吧,其实你第一回的5分也应该给选我,估计是你没明白用法

VB.net怎么弹出如下类似的对话框（看图）？

可以利用msgbox 实现，也可以通过另外的窗体上画出表格实现

方法一，利用msgbox：

Private Sub Command1_Click()Dim a As Long, b As Long, c As LongMsgBox "┌────┬────┬────┐" vbCrLf _ "│ 库存1 │ 库存2 │ 库存3 │" vbCrLf _ "├────┼────┼────┤" vbCrLf _ "│" formatstr(a) "│" formatstr(b) "│" formatstr(c) "│" vbCrLf _ "└────┴────┴────┘" End SubPrivate Function formatstr(ByVal inputStr As String) As StringDim j As Integerj = (8 - Len(inputStr)) \ 2formatstr = Space(j) inputStr Space(j) Space((8 - Len(inputStr)) Mod 2)End Function

方法二，利用窗体实现：

’新建form2窗体‘将以下代码复制到form2窗体中Private Sub Form_Load()ShowPrint "┌────┬────┬────┐" vbCrLf _ "│ 库存1 │ 库存2 │ 库存3 │" vbCrLf _ "├────┼────┼────┤" vbCrLf _ "│" formatstr(a) "│" formatstr(b) "│" formatstr(c) "│" vbCrLf _ "└────┴────┴────┘" End SubPrivate Function formatstr(ByVal inputStr As String) As StringDim j As Integerj = (8 - Len(inputStr)) \ 2formatstr = Space(j) inputStr Space(j) Space((8 - Len(inputStr)) Mod 2)End Function‘将以下代码复制在form1窗体中Private Sub Command1_Click()Form2.ShowEnd Sub

如何通过vb.net WinForm窗体上画线条或弧线，让用户可以用鼠标捕捉（选中）已画的线条。

代码写起来可能比较麻烦，给你个思路，就是用GraphicsPath来绘制，然后通过绘制目标的鼠标移动事件来获取当前鼠标在绘制目标中的实际位置，再通过GraphicsPath的IsVisible()方法来确认鼠标是否包含在GraphicsPath中。

DrawLine直线比较容易处理，只要得到Line的坐标点，然后比较当前鼠标坐标就好。

VB.net 里怎么实现气泡在窗体中随机移动？

可以建立一个方向向量用来存储气泡运动的方向（方向值每到一定时间随机产生），再定义一个表示速度的变量（如果要的是均速运动速度值就不变，否则也可以随机产生）。再用速度和方向值改变气泡位置。

我可以做个例子（qq:359394386）,但分不能太低。

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