vbnet如何输出保存图片？

[xiansr]

目标：把picturebox中的图片保存到硬盘
方法：在picturebox中加载一张本地硬盘上的图片，然后使用pen工具在上面画几条直线。
问题：现在不知道用什么方法能够把修改后的图片保存到硬盘上，比如，save,可是保存的图片并未改变。

[z_kai]

bmp.getpixel 读取图片框的像素到新的图片类

然后再保存就可以了，，

[xiansr]

楼上的方法不会用。自己摸索的方法。
Imports System.Drawing.Imaging
Public Class Form1
Dim imageName As String = "C:\Documents and Settings\...\1126.jpg"
Dim i As Image = Image.FromFile(imageName)
Dim g As Graphics = Graphics.FromImage(i)

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'划线
Dim BluePen As New Pen(Color.Blue, 5)
BluePen.DashStyle = Drawing2D.DashStyle.Solid
g.DrawLine(BluePen, 100.0F, 170, 500.0F, 170)
g.Dispose()
PictureBox1.Image = i
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
'退出
Me.Close()
End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
'存盘
i.Save("C:\testimage.jpg", ImageFormat.Jpeg)
i.Dispose()
End Sub

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
PictureBox1.Image = i
End Sub
End Class

[cgtsea]

ding!

[wzuomin]

Public Sub SaveCurve(ByVal FileName As String)
Dim bmp As New Bitmap(Pic.Width, Pic.Height)
bmp.Save(FileName)
End Sub

[bvtc_liguoyuan]

楼主顺便把代码注释下嘛.谢谢。