vb.net 將文件轉(zhuǎn)化成二進制

首先引入System.IO命名空間

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Imports System.IO

然后使用文件流來讀入數(shù)組：

Dim bytes() As Byte

Using fs As New FileStream(文件路徑,FileMode.Open)

ReDim bytes(fs.Length-1)

fs.Read(bytes,0,fs.Length)

fs.Close()

End Using

這樣bytes就是整個文件的所有字節(jié)了

從字節(jié)生成Image：

Dim img As Image = Image.FromStream(New MemoryStream(bytes))

img就是圖片了

vb.net 圖片轉(zhuǎn)換二進制代碼

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

Dim MyStream As New System.IO.MemoryStream

Me.PictureBox1.Image.Save(MyStream, System.Drawing.Imaging.ImageFormat.Jpeg)

Dim MyBytes(MyStream.Length) As Byte

MyStream.Read(MyBytes, 0, MyStream.Length)

MyStream.Close()

Dim strText As String

strText = BitConverter.ToString(MyBytes)

Me.TextBox1.Text = strText

End Sub

vb.net如何將圖片轉(zhuǎn)二進制

'容易，用api，查一查SetBitmapBits

'新建工程，增加一個 command button ， 一個 picture box , 將圖片加載到 picture box.

'將代碼粘貼到 Form1

Private Type BITMAP

bmType As Long

bmWidth As Long

bmHeight As Long

bmWidthBytes As Long

bmPlanes As Integer

bmBitsPixel As Integer

bmBits As Long

End Type

Private Declare Function GetObject Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long

Private Declare Function GetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, ByVal dwCount As Long, lpBits As Any) As Long

Private Declare Function SetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, ByVal dwCount As Long, lpBits As Any) As Long

Dim PicBits() As Byte, PicInfo As BITMAP, Cnt As Long

Private Sub Command1_Click()

'Get information (such as height and width) about the picturebox

GetObject Picture1.Image, Len(PicInfo), PicInfo

'reallocate storage space

ReDim PicBits(1 To PicInfo.bmWidth * PicInfo.bmHeight * 3) As Byte

'Copy the bitmapbits to the array

GetBitmapBits Picture1.Image, UBound(PicBits), PicBits(1)

'Invert the bits

For Cnt = 1 To UBound(PicBits)

PicBits(Cnt) = 255 - PicBits(Cnt)

Next Cnt

'Set the bits back to the picture

SetBitmapBits Picture1.Image, UBound(PicBits), PicBits(1)

'refresh

Picture1.Refresh

End Sub

vb.net 二進制讀取文件

VB.NET打開二進制文件用fileopen完成，打開二進制文件的形式為：openmode.binary

讀取二進制文件用的是fileget方法，寫入二進制文件用的是fileput方法。

應(yīng)用示例：將一批隨機數(shù)保存在一個dat文件中，然后再將其提取到文本框中。

二進制文件的讀寫一批隨機數(shù)的存取，程序為：

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

Dim x, i, fn As Integer

Dim s As String = ""

fn = FreeFile()

FileOpen(fn, "d:\data.dat", OpenMode.Binary)

For i = 1 To 8

x = Int(Rnd() * 100)

s = s + Str(x)

FilePut(fn, x)

Next

FileClose(fn)

TextBox1.Text = s

End Sub

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

Dim x, fn As Integer

Dim s As String = ""

fn = FreeFile()

FileOpen(fn, "d:\data.dat", OpenMode.Binary)

Do While Not EOF(fn)

FileGet(fn, x)

s = s + Str(x) + " "

Loop

FileClose(fn)

TextBox1.Text = s

End Sub

標(biāo)題名稱：vbnet轉(zhuǎn)2進制 vb十進制轉(zhuǎn)換成二進制
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