VB.net压缩图片代码 net 图片压缩
vb.net进行文件压缩
如果机器安装有winRar软件，就可以通过shell来借用他的功能达到压缩文件的效果；
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参考代码如下：
Dim DeliveryF As String = Server.MapPath("..\Temp\DeliveryFactors.xls") '原始文件 (压缩前)
Dim TruckInfo As String = Server.MapPath("..\Temp\TruckInformation.xls")
Dim QDetail As String = Server.MapPath("..\Temp\QuotationDetail.xls")
'用shell命令调用winrar.exe创建压缩文件()
Dim winRarexe As String = "C:\Program Files\WinRAR\Rar" 'winzip 执行文件的位置
Dim wtarget As String = "C:\temp\QuotationVAComparsion.zip" '目地文件 (压缩后)
Dim command As String = winRarexe " a " wtarget " " DeliveryF " " TruckInfo " " QDetail
'这个命令你可以查看winrar的命令集
Dim retval As Double 'Shell 指令传回值
retval = Shell(command, AppWinStyle.MinimizedFocus)
vb中将bmp格式的图片转换为JPG格式。要代码，最好越简单越好
下面是源代码:
添加picturebox,commandbutton
Option Explicit
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(0 To 7) As Byte
End Type
Private Type GdiplusStartupInput
GdiplusVersion As Long
DebugEventCallback As Long
SuppressBackgroundThread As Long
SuppressExternalCodecs As Long
End Type
Private Type EncoderParameter
GUID As GUID
NumberOfValues As Long
type As Long
Value As Long
End Type
Private Type EncoderParameters
Count As Long
Parameter As EncoderParameter
End Type
Private Declare Function GdiplusStartup Lib "GDIPlus" (token As Long, inputbuf As GdiplusStartupInput, ByVal outputbuf As Long) As Long
Private Declare Function GdiplusShutdown Lib "GDIPlus" (ByVal token As Long) As Long
Private Declare Function GdipCreateBitmapFromHBITMAP Lib "GDIPlus" (ByVal hbm As Long, ByVal hpal As Long, Bitmap As Long) As Long
Private Declare Function GdipDisposeImage Lib "GDIPlus" (ByVal Image As Long) As Long
Private Declare Function GdipSaveImageToFile Lib "GDIPlus" (ByVal Image As Long, ByVal filename As Long, clsidEncoder As GUID, encoderParams As Any) As Long
Private Declare Function CLSIDFromString Lib "ole32" (ByVal str As Long, id As GUID) As Long
Private Declare Function GdipCreateBitmapFromFile Lib "GDIPlus" (ByVal filename As Long, Bitmap As Long) As Long
Private Sub Command1_Click()
Dim ret As Boolean
Picture1.Picture = LoadPicture("C:\a.bmp") '打开要压缩的图片
ret = PictureBoxSaveJPG(Picture1, "C:\b.jpg") '保存压缩后的图片
If ret = False Then
MsgBox "保存失败"
End If
End Sub
Private Function PictureBoxSaveJPG(ByVal pict As StdPicture, ByVal filename As String, Optional ByVal quality As Byte = 80) As Boolean
Dim tSI As GdiplusStartupInput
Dim lRes As Long
Dim lGDIP As Long
Dim lBitmap As Long
'初始化 GDI+
tSI.GdiplusVersion = 1
lRes = GdiplusStartup(lGDIP, tSI, 0)
If lRes = 0 Then
'从句柄创建 GDI+ 图像
lRes = GdipCreateBitmapFromHBITMAP(pict.Handle, 0, lBitmap)
If lRes = 0 Then
Dim tJpgEncoder As GUID
Dim tParams As EncoderParameters
'初始化解码器的GUID标识
CLSIDFromString StrPtr("{557CF401-1A04-11D3-9A73-0000F81EF32E}"), tJpgEncoder
'设置解码器参数
tParams.Count = 1
With tParams.Parameter ' Quality
'得到Quality参数的GUID标识
CLSIDFromString StrPtr("{1D5BE4B5-FA4A-452D-9CDD-5DB35105E7EB}"), .GUID
.NumberOfValues = 1
.type = 4
.Value = VarPtr(quality)
End With
'保存图像
lRes = GdipSaveImageToFile(lBitmap, StrPtr(filename), tJpgEncoder, tParams)
'销毁GDI+图像
GdipDisposeImage lBitmap
End If
'销毁 GDI+
GdiplusShutdown lGDIP
End If
If lRes Then
PictureBoxSaveJPG = False
Else
PictureBoxSaveJPG = True
End If
End Function
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vb.net如何将JPG文件缩放至不大于指定的字节数
1.我有个思路可以尝试一下：把一张字节数在280-300K的图片用PS打开看看像素大小；
2.定义一个新的位图，指定像素大小为上面得到的数据；
3.读取你需要修改大小的JPG文件，然后按指定大小复制到上面新建的位图，并保存为JPG格式
我想用VB写一个压缩图片的程序，应该怎么写
如果你是仅仅为了压缩，而不是为了编程，你可以用ACDSee，他可以批量操作，方法是在ACDSee中选择你需要压缩的全部文件，点 工具 调整大小 选项很明显，你试一试。
你非要用程序的话，看看一下参考
注意：
PicClipD的ScaleMode=vbPixels
源图像是ImgSrc
目的图像是PicDest，注意它的属性
最关键的实现过程在CmdMake_Click
将下列内容复制到记事本，并保存为相应的文件
PicScale.vbp
--------------------
Type=Exe
Form=FrmMain.frm
Reference=*\G{00020430-0000-0000-C000-000000000046}#2.0#0#..\..\..\..\WINDOWS\system32\stdole2.tlb#OLE Automation
Object={F9043C88-F6F2-101A-A3C9-08002B2F49FB}#1.2#0; COMDLG32.OCX
IconForm="FrmMain"
Startup="FrmMain"
HelpFile=""
ExeName32="PicScale.exe" "
Command32="" "
Name="PicScale"
HelpContextID="0"
CompatibleMode="0"
MajorVer=1
MinorVer=0
RevisionVer=0
AutoIncrementVer=0
ServerSupportFiles=0
CompilationType=0
OptimizationType=0
FavorPentiumPro(tm)=0
CodeViewDebugInfo=0
NoAliasing=0
BoundsCheck=0
OverflowCheck=0
FlPointCheck=0
FDIVCheck=0
UnroundedFP=0
StartMode=0
Unattended=0
Retained=0
ThreadPerObject=0
MaxNumberOfThreads=1
[MS Transaction Server]
AutoRefresh=1
FrmMain.frm
----------------------------------
VERSION 5.00
Object = "{F9043C88-F6F2-101A-A3C9-08002B2F49FB}#1.2#0"; "COMDLG32.OCX"
Begin VB.Form FrmMain
Caption = "简单图像文件缩放"
ClientHeight = 3810
ClientLeft = 165
ClientTop = 855
ClientWidth = 5505
HasDC = 0 'False
LinkTopic = "Form1"
ScaleHeight = 254
ScaleMode = 3 'Pixel
ScaleWidth = 367
StartUpPosition = 3 '窗口缺省
Begin MSComDlg.CommonDialog CDlgFile
Left = 2160
Top = 1320
_ExtentX = 847
_ExtentY = 847
_Version = 393216
End
Begin VB.PictureBox PicClipD
BackColor = H8000000C
HasDC = 0 'False
Height = 1695
Left = 2520
ScaleHeight = 109
ScaleMode = 3 'Pixel
ScaleWidth = 117
TabIndex = 8
TabStop = 0 'False
Top = 840
Width = 1815
Begin VB.PictureBox PicDest
AutoRedraw = -1 'True
BackColor = H00FFFFFF
BorderStyle = 0 'None
Height = 495
Left = 240
ScaleHeight = 33
ScaleMode = 3 'Pixel
ScaleWidth = 65
TabIndex = 9
TabStop = 0 'False
Top = 360
Width = 975
End
End
Begin VB.PictureBox PicClipS
BackColor = H8000000C
HasDC = 0 'False
Height = 1575
Left = 360
ScaleHeight = 101
ScaleMode = 3 'Pixel
ScaleWidth = 101
TabIndex = 7
TabStop = 0 'False
Top = 840
Width = 1575
Begin VB.Image ImgSrc
Height = 855
Left = 240
Top = 240
Width = 855
End
End
Begin VB.PictureBox PicToolBar
Align = 1 'Align Top
HasDC = 0 'False
Height = 495
Left = 0
ScaleHeight = 29
ScaleMode = 3 'Pixel
ScaleWidth = 363
TabIndex = 0
TabStop = 0 'False
Top = 0
Width = 5505
Begin VB.CommandButton CmdReset
Caption = "复位"
Height = 255
Left = 3960
TabIndex = 6
Top = 120
Width = 780
End
Begin VB.CommandButton CmdMake
Caption = "生成"
Height = 255
Left = 3120
TabIndex = 5
Top = 120
Width = 780
End
Begin VB.TextBox TxtHeight
Height = 270
Left = 2280
TabIndex = 4
Text = "Text1"
Top = 120
Width = 750
End
Begin VB.TextBox TxtWidth
Height = 270
Left = 720
TabIndex = 2
Text = "Text1"
Top = 120
Width = 750
End
Begin VB.Label LblHeight
AutoSize = -1 'True
Caption = "Height:"
Height = 180
Left = 1680
TabIndex = 3
Top = 120
Width = 630
End
Begin VB.Label LblWidth
AutoSize = -1 'True
Caption = "Width:"
Height = 180
Left = 120
TabIndex = 1
Top = 120
Width = 540
End
End
Begin VB.Menu mnuFile
Caption = "文件(F)"
Begin VB.Menu mnuOpen
Caption = "打开(O)..."
End
Begin VB.Menu mnuSave
Caption = "保存(S)..."
End
Begin VB.Menu mnuSep0_0
Caption = "-"
End
Begin VB.Menu mnuExit
Caption = "退出(X)"
End
End
End
Attribute VB_Name = "FrmMain"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Private Const CtlSpace = 4 '控件之间的距离
Private Sub CmdMake_Click()
Dim nWidth As Long
Dim nHeight As Long
'得到数值
On Error GoTo ErrNum
nWidth = CLng(TxtWidth.Text)
nHeight = CLng(TxtHeight.Text)
On Error GoTo 0
If nWidth 1 Or nHeight 1 Then GoTo ErrNum
'改变大小
On Error GoTo ErrSetSize
PicDest.Move 0, 0, nWidth, nHeight
On Error GoTo 0
'取消PictureBox的缓存
Set PicDest.Picture = Nothing
'绘制图像
PicDest.PaintPicture ImgSrc, 0, 0, PicDest.ScaleWidth, PicDest.ScaleHeight
Exit Sub
ErrNum:
MsgBox "错误的数值！", vbCritical
Exit Sub
ErrSetSize:
MsgBox "无法创建这么大的图片！", vbCritical
Exit Sub
End Sub
Private Sub CmdReset_Click()
If ImgSrc.Picture.Type = vbPicTypeNone Then '无图片
TxtWidth.Text = CStr(1)
TxtHeight.Text = CStr(1)
CmdMake.Enabled = False
Else
TxtWidth.Text = CStr(ImgSrc.Width)
TxtHeight.Text = CStr(ImgSrc.Height)
CmdMake.Enabled = True
Call CmdMake_Click
End If
End Sub
Private Sub Form_Load()
'-- 初始化坐标定位
Dim SM_Me As Long
Dim SM_Tbr As Long
Dim nTemp As Long
SM_Me = Me.ScaleMode
SM_Tbr = PicToolBar.ScaleMode
'定位PicToolBar的高度
With PicToolBar
'计算边框大小
nTemp = Me.ScaleY(.Height, SM_Me, vbPixels) - .ScaleY(.ScaleHeight, SM_Tbr, vbPixels)
'计算PicToolBar应有高度
nTemp = nTemp + .ScaleY(TxtWidth.Height, SM_Tbr, vbPixels)
'设置高度
.Height = Me.ScaleY(nTemp, vbPixels, SM_Me)
End With
'定位PicToolBar内的控件
nTemp = PicToolBar.ScaleHeight
LblWidth.Move CtlSpace, (nTemp - LblWidth.Height) / 2
TxtWidth.Move LblWidth.Left + LblWidth.Width, 0
LblHeight.Move TxtWidth.Left + TxtWidth.Width + CtlSpace, (nTemp - LblWidth.Height) / 2
TxtHeight.Move LblHeight.Left + LblHeight.Width, 0, TxtHeight.Width, TxtWidth.Height
CmdMake.Move TxtHeight.Left + TxtHeight.Width + CtlSpace, 0, CmdMake.Width, TxtWidth.Height
CmdReset.Move CmdMake.Left + CmdMake.Width + CtlSpace, 0, CmdReset.Width, TxtWidth.Height
ImgSrc.Move 0, 0
PicDest.Move 0, 0
'--设置数值
Call CmdReset_Click
With CDlgFile
.CancelError = True
.Flags = cdlOFNOverwritePrompt Or cdlOFNHideReadOnly
.Filter = "Windows位图(*.bmp)|*.bmp|所有文件(*.*)|*.*"
End With
End Sub
Private Sub Form_Resize()
If Me.WindowState = 1 Then Exit Sub
On Error Resume Next
Dim nTemp As Long
nTemp = PicToolBar.Height
PicClipS.Move 0, nTemp, Me.ScaleWidth / 2, Me.ScaleHeight - nTemp
PicClipD.Move PicClipS.Width, nTemp, Me.ScaleWidth - PicClipS.Width, PicClipS.Height
End Sub
Private Sub mnuExit_Click()
Unload Me
End Sub
Private Sub mnuOpen_Click()
On Error Resume Next
CDlgFile.ShowOpen
If Err.Number Then Exit Sub '点了取消
'打开
Set ImgSrc.Picture = LoadPicture(CDlgFile.FileName)
If Err.Number Then
MsgBox "无法打开文件！", vbCritical
Exit Sub
End If
On Error GoTo 0
Call CmdReset_Click
End Sub
Private Sub mnuSave_Click()
On Error Resume Next
CDlgFile.ShowSave
If Err.Number Then Exit Sub '点了取消
'保存
SavePicture PicDest.Image, CDlgFile.FileName
If Err.Number Then
MsgBox "无法保存图片！", vbCritical
Exit Sub
End If
On Error GoTo 0
End Sub
vb.net 如何压缩、解压缩文件
1、你先搞懂 winrar.exe 的解压参数格式，然后把winrar.exe和相关文件加入到资源文件中，然后调用 资源文件中的winrar.exe
2、弄明白rar/zip文件解压/压缩方法和格式，自己写程序 (可能会比较麻烦)
文章题目：VB.net压缩图片代码 net 图片压缩
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