vb中如何使窗体半透明，控件不透明？

下面代码能能使窗体透明，但控件不透明：

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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 Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long

Private Const WS_EX_LAYERED = H80000

Private Const GWL_EXSTYLE = (-20)

Private Const WS_EX_TRANSPARENT = H20

Private Const LWA_ALPHA = H2

Private Const LWA_COLORKEY = H1

Private Sub Form_Load()

Dim rtn As Long, ctrol As Control

rtn = GetWindowLong(hwnd, GWL_EXSTYLE)

rtn = rtn Or WS_EX_TRANSPARENT

SetWindowLong hwnd, GWL_EXSTYLE, rtn

Me.Show

DoEvents

For Each ctrol In Me.Controls

ctrol.Refresh

Next

'SetLayeredWindowAttributes hwnd, 0, 100, LWA_ALPHA '100值可调，0-255之间，越小透明度越高

'SetLayeredWindowAttributes hwnd, RGB(0, 0, 0), 0, LWA_COLORKEY '将窗体上的黑颜色去掉

End Sub

vb.net 窗体背景透明 而控件不透明！

PNG透明时，在窗体上的颜色是这个窗体的BackColor

可以将窗体的TransparencyKey属性设为BackColor

请问在VB.net中怎样实现控件具有透明背景?

将控件的背景色设为透明即可：

如Label1.BackColor=Color.

Transparent

当然，还有别的方式可使底色透明，你自已琢磨一下。

vb.net如何修改控件的透明度

选择要设置透明度的控件，然后找到该控件的Opacity属性，修改里面的百分比就可以达到透明的效果，输入的值越小，控件就越透明。

vb.net picture控件本身不透明 就像这样 我不想要小人下面的黑块..这个小人是透明的,

PictureBox1.BackColor=Color.Transparent

用PS处理成gif格式的就可以了，vb不支持PNG图片，但是gif是可以的

vb 中怎么实现 窗体透明 但控件不透明 求 代码 谢谢

先把窗体的颜色换成其它的，然后在用SetLayeredWindowAttributes函数设置窗体的背景色为透明，如果觉得窗体的标题栏没透明而不美观的话，可以把窗体的BorderStyle设为0。 代码举例(在窗体代码区中加入)：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

Declare

Function

SetLayeredWindowAttributes

Lib

"user32"

(ByVal

hWnd

As

Long,

ByVal

crKey

As

Long,

ByVal

bAlpha

As

Byte,

ByVal

dwFlags

As

Long)

As

Long Private

Sub

Form_Load()

Me.BackColor

=

RGB(210,

210,

210)

'背景透明

Dim

crKey

As

Long,

bAlpha

As

Byte,

dwFlags

As

Long

Call

SetWindLong

dwFlags

=

1

'1

只有

crKey

指定的颜色才透明，忽略

bAlpha

参数

crKey

=

Me.BackColor

'窗体中设为透明的颜色

SetLayeredWindowAttributes

Me.hWnd,

crKey,

bAlpha,

dwFlags

End

Sub Private

Sub

SetWindLong()

'为调用

SetLayeredWindowAttributes

做准备

Dim

ExsTyle

As

Long

Const

WS_EX_Layered

=

H80000,

GWL_ExsTyle

=

-20

ExsTyle

=

GetWindowLong(Me.hWnd,

GWL_ExsTyle)

ExsTyle

=

ExsTyle

Or

WS_EX_Layered

SetWindowLong

Me.hWnd,

GWL_ExsTyle,

ExsTyle

End

Sub

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