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(lái)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(gè)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
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
'容易,用api,查一查SetBitmapBits
'新建工程,增加一個(gè) command button , 一個(gè) 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打開(kāi)二進(jìn)制文件用fileopen完成,打開(kāi)二進(jìn)制文件的形式為:openmode.binary
讀取二進(jìn)制文件用的是fileget方法,寫(xiě)入二進(jìn)制文件用的是fileput方法。
應(yīng)用示例:將一批隨機(jī)數(shù)保存在一個(gè)dat文件中,然后再將其提取到文本框中。
二進(jìn)制文件的讀寫(xiě)一批隨機(jī)數(shù)的存取,程序?yàn)椋?/p>
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(chēng):vbnet轉(zhuǎn)2進(jìn)制 vb十進(jìn)制轉(zhuǎn)換成二進(jìn)制
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