VB.NET 一次函數(shù)求橫坐標(biāo)

Private?Sub?Button1_Click(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Button1.Click

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Dim?X2?As?Integer?=?0

Dim?Y2?As?Integer?=?0

Dim?X3?As?Integer?=?2

Dim?Y3?As?Integer?=?-1

Dim?X4?As?Integer?=?6

Dim?Y4?As?Integer?=?3

'首先計(jì)算y=kx+b

Dim?k?As?Double?=?(6?-?2)?/?(3?-?(-1))

Dim?b?As?Double?=?-1?-?k?*?2

'根據(jù)y求x

Dim?X5?As?Double?=?-b?/?k

TextBox1.Text?=?Math.Abs(X5?-?X2)

End?Sub

vb.net2010十六進(jìn)制讀取串口的問題

不是很明白你的題意

strHex = strHex + [String].Format("{0:X2} "

這里的意思是把每個(gè)字節(jié)數(shù)據(jù)轉(zhuǎn)換成了十六進(jìn)制，每個(gè)字節(jié)占兩個(gè)字符

如果你串口收到的4個(gè)字節(jié)數(shù)據(jù)：43,27,56,200

那么你的結(jié)果是：2B1B38C8

即receivebytes.Text="2B1B38C8"

不足兩位的補(bǔ)0

如果你串口收到的4個(gè)字節(jié)數(shù)據(jù)：3,27,56,200

那么你的結(jié)果是：031B38C8

即receivebytes.Text="031B38C8"

vb.net數(shù)組賦值

Dim x(8, 8)

Dim a As Integer

Dim b As Integer

b = 0

For i = 0 To 8

For j = 0 To 8

If b = 3 Then

b = 1

a = a + 1

Else

b = b + 1

End If

x(i, j) = aNext

Next

求VB.NET的MD5算法調(diào)用

下面是完整的類，可以設(shè)置任意密碼

'DES及md5加密解密----添加引用中添加對system.web的引用。

Imports?System.Security.Cryptography

Imports?System

Imports?System.Text

Imports?System.Web

'''?summary

'''?DES加密類

'''?/summary

'''?remarks/remarks

Public?Class?DESEncrypt

Public?Sub?DESEncrypt()

End?Sub

Public?Shared?Function?Encrypt(ByVal?Text?As?String)?As?String

Return?Encrypt(Text,?"12345678")

End?Function

Public?Shared?Function?Encrypt(ByVal?Text?As?String,?ByVal?sKey?As?String)?As?String

Dim?des?As?New?DESCryptoServiceProvider()

Dim?inputByteArray?As?Byte()

inputByteArray?=?Encoding.Default.GetBytes(Text)

des.Key?=?ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey,?"md5").Substring(0,?8))

des.IV?=?ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey,?"md5").Substring(0,?8))

Dim?ms?As?New?System.IO.MemoryStream()

Dim?cs?As?New?CryptoStream(ms,?des.CreateEncryptor(),?CryptoStreamMode.Write)

cs.Write(inputByteArray,?0,?inputByteArray.Length)

cs.FlushFinalBlock()

Dim?ret?As?New?StringBuilder()

Dim?b?As?Byte

For?Each?b?In?ms.ToArray()

ret.AppendFormat("{0:X2}",?b)

Next

Return?ret.ToString()

End?Function

Public?Shared?Function?Decrypt(ByVal?Text?As?String)?As?String

Return?Decrypt(Text,?"12345678")

End?Function

Public?Shared?Function?Decrypt(ByVal?Text?As?String,?ByVal?sKey?As?String)?As?String

Dim?des?As?New?DESCryptoServiceProvider()

Dim?len?As?Integer

len?=?Text.Length?/?2

Dim?inputByteArray(len?-?1)?As?Byte

Dim?x,?i?As?Integer

For?x?=?0?To?len?-?1

i?=?Convert.ToInt32(Text.Substring(x?*?2,?2),?16)

inputByteArray(x)?=?CType(i,?Byte)

Next

des.Key?=?ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey,?"md5").Substring(0,?8))

des.IV?=?ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey,?"md5").Substring(0,?8))

Dim?ms?As?New?System.IO.MemoryStream()

Dim?cs?As?New?CryptoStream(ms,?des.CreateDecryptor(),?CryptoStreamMode.Write)

cs.Write(inputByteArray,?0,?inputByteArray.Length)

cs.FlushFinalBlock()

Return?Encoding.Default.GetString(ms.ToArray())

End?Function

End?Class

'以下是調(diào)用方法

Public?Class?Form1

Private?Sub?Button1_Click(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Button1.Click?'加密

Dim?str_Encrypt?As?String?=?DESEncrypt.Encrypt("你要加密的文本，可以是任意長度",?"密碼，可以很長，如果省略這個(gè)參數(shù)就是默認(rèn)的12345678")

End?Sub

Private?Sub?Button2_Click(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Button2.Click?'解密

Dim?str_Decrypt?As?String?=?DESEncrypt.Decrypt("你要解密的文本,?可以是任意長度",?"加密時(shí)用到的密碼，如果省略這個(gè)參數(shù)就是默認(rèn)的12345678")

End?Sub

vb.net怎么自定義坐標(biāo)系

scale(x1,y1)-(x2,y2)

你只要記住，這里的x1,y1是左上角的坐標(biāo)，x2,y2是右下角的坐標(biāo)，通過這兩個(gè)點(diǎn)的坐標(biāo)設(shè)定，就可以決定坐標(biāo)原點(diǎn)的位置以及坐標(biāo)軸的方向了，比如

Scale (-300,200)-(300,-200)

以上是把坐標(biāo)原點(diǎn)設(shè)在窗體中心，x軸長600，方向從左到右，y軸長400，方向從下向上。

Scale (800,0)-(0,600)

以上是把坐標(biāo)原點(diǎn)設(shè)在窗體右上角，x軸長800，方向從右到左，y軸長600，方向從上向下。

下面說坐標(biāo)軸和原點(diǎn)的標(biāo)示法：

假定自定義坐標(biāo)設(shè)為：

Scale (-300, 200)-(300, -200)

則

Line (-300, 0)-(300, 0) '畫x軸

Line (0, 200)-(0, -200) '畫y軸

CurrentX = 290

CurrentY = -5

Print "x" '標(biāo)示x軸

CurrentX = 5

CurrentY = 200

Print "y" '標(biāo)示y軸

CurrentX = 5

CurrentY = -5

Print "0" '標(biāo)示原點(diǎn)