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vb.net像素颜色值 vb颜色代码rgb
VBNET怎么获取控件颜色的RGB值，又怎么用RGB将颜色赋给控件颜色。
R/G/B值最小是0最大是255属Byte值类型
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Dim cr As Color = 控件.BackColor '获取控件背景色
Dim alpha As Byte = cr.A '透明度
Dim R As Byte = cr.R 'R值
Dim G As Byte = cr.G 'G值
Dim B As Byte = cr.B 'B值
Dim outAcr As Color = Color.FromArgb(alpha, R, G, B) '创建带有透明通道的ARGB颜色
Dim outcr As Color = Color.FromArgb(R, G, B) '创建不透明的RGB颜色
VB.NET：绘图后，如何才能取得所绘图形的颜色值？
加入一个TextBox控件,一个Command控件
代码:
Private Declare Function GetPixel Lib "gdi32" (ByVal hDC As Long, ByVal X As Long, ByVal Y As Long) As Long
Private Declare Function GetWindowDC Lib "user32" (ByVal hWnd As Long) As Long
Private Sub Command1_Click()
Dim Color As Long
WindowDC = GetWindowDC(0) '获取屏幕的设备场景
Color = GetPixel(WindowDC, 500, 100) '获指定点的颜色
'分解RGB颜色值
R = (Color Mod 256) '红色
b = (Int(Color \ 65536)) '蓝色
G = ((Color - (b * 65536) - R) \ 256) '绿色
Text1.BackColor = RGB(R, G, b)
End Sub
vb.net 如何读取ini文件定义的ForeColor颜色值
你好，我不知道你是用什么方法保存的，不过.net里的color有一个方法是Color.FromArgb 你可以这么做，dim
c
as
color=richtextbox1.ForeColor dim
colorstring
as
string=c.ToArgb().ToString
colorstring就是颜色的值（字符串）再把colorstring保存到ini文件加载颜色的时候，从ini里读取colorstring 具体是：dim
RtextColor
as
color=Color.FromArgb（cint(colorstring))richtextbox1.ForeColor
=RtextColor
vb如何查找像素读取颜色
既然小方框的边为纯黑色，那么还是比较好找出小方框的位置的。
假设小方框的大小是不变的(我不知道是否会变，长为a,宽为b,单位pt)
1，通过api取点的颜色。2，因为只找左右的两条边，所以从上到下跳越式的搜索(步长=小方框的宽度b)3，每跳一下，就从左至右的逐像素的搜索，如果找到黑色的点，就上下连续搜索一定数量的点
如果全部为黑色，则证明是一条黑线，说明找到了左边，在左边的基本上，加上宽度，就是右边了。
在此右边还可以用来校验搜索的结果是否正确。4，找到了左右两条边的位置，剩下的就设置你的竖线的位置。
下面给出大体上的代码：
GetPixel函数是获取设备指定点颜色值的。
for
y
=
to
yMax
step
b-1for
x=0
to
xMax
if
GetPixel(hdc,x,y)
=vbBlack
then
'向上搜索一定数量的点,判断是否全部为黑色
'.........
'向下搜索一定数量的点,判断是否全部为黑色
'.........
end
ifnextnext
在vb.net中，如何获取Graphics中某一指定点（像素）的颜色值？（VB语言）
要使用GetPixel函数来取得像素的颜色值，代码如下：
1
2
3
4
5
private void button1_Click(object sender, EventArgs e)
{
Color color = new Bitmap(pictureBox1.Image).GetPixel(10, 10);
MessageBox.Show(color.ToString());
VB.NET设置屏幕分辨率、颜色位数、刷新率 实例代码
这篇文章介绍了VB.NET设置屏幕分辨率、颜色位数、刷新率
实例代码，有需要的朋友可以参考一下
复制代码
代码如下:
Private
Declare
Function
GetDeviceCaps
Lib
"gdi32"
(ByVal
hdc
As
Long,
ByVal
nIndex
As
Long)
As
Long
Private
Declare
Function
ChangeDisplaySettings
Lib
"user32"
Alias
"ChangeDisplaySettingsA"
(lpDevMode
As
Any,
ByVal
dwflags
As
Long)
As
Long
Private
Const
CCDEVICENAME
As
Long
=
32
Private
Const
CCFORMNAME
As
Long
=
32
Private
Const
DM_BITSPERPEL
As
Long
=
H40000
Private
Const
DM_PELSWIDTH
As
Long
=
H80000
Private
Const
DM_PELSHEIGHT
As
Long
=
H100000
Private
Const
DM_DISPLAYFLAGS
As
Long
=
H200000
Private
Const
DM_DISPLAYFREQUENCY
=
H400000
Private
Const
CDS_FORCE
As
Long
=
H80000000
Private
Const
BITSPIXEL
As
Long
=
12
Private
Const
HORZRES
As
Long
=
8
Private
Const
VERTRES
As
Long
=
10
Private
Const
VREFRESH
=
116
Private
Type
DEVMODE
dmDeviceName
As
String
*
CCDEVICENAME
dmSpecVersion
As
Integer
dmDriverVersion
As
Integer
dmSize
As
Integer
dmDriverExtra
As
Integer
dmFields
As
Long
dmOrientation
As
Integer
dmPaperSize
As
Integer
dmPaperLength
As
Integer
dmPaperWidth
As
Integer
dmScale
As
Integer
dmCopies
As
Integer
dmDefaultSource
As
Integer
dmPrintQuality
As
Integer
dmColor
As
Integer
dmDuplex
As
Integer
dmYResolution
As
Integer
dmTTOption
As
Integer
dmCollate
As
Integer
dmFormName
As
String
*
CCFORMNAME
dmUnusedPadding
As
Integer
dmBitsPerPel
As
Integer
dmPelsWidth
As
Long
dmPelsHeight
As
Long
dmDisplayFlags
As
Long
dmDisplayFrequency
As
Long
End
Type
Private
Sub
cmdChangeDesktopMode_Click()
Dim
DM
As
DEVMODE
With
DM
.dmPelsWidth
=
CInt(txtNewWidth.Text)
.dmPelsHeight
=
CInt(txtNewHeight.Text)
.dmBitsPerPel
=
CInt(txtNewColor.Text)
.dmDisplayFrequency
=
CInt(txtNewFreq.Text)
.dmFields
=
DM_PELSWIDTH
Or
DM_PELSHEIGHT
Or
DM_BITSPERPEL
Or
DM_DISPLAYFREQUENCY
.dmSize
=
LenB(DM)
End
With
If
ChangeDisplaySettings(DM,
CDS_FORCE)
Then
MsgBox
"错误!不支持此模式！"
End
If
End
Sub
Private
Sub
Form_Load()
txtOldWidth.Text
=
GetDeviceCaps(Me.hdc,
HORZRES)
txtOldHeight.Text
=
GetDeviceCaps(Me.hdc,
VERTRES)
txtOldColor.Text
=
GetDeviceCaps(Me.hdc,
BITSPIXEL)
txtOldFreq.Text
=
GetDeviceCaps(Me.hdc,
VREFRESH)
End
Sub
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