vb.net如何输出图片 vbnet printdocument
vb 如何使部分窗体生成图片
只要将VB窗口内的需要部分保存成图片文件就可以了
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要用到API函数的：
Private Type POINTAPI
x As Long
y As Long
End Type
Private Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Declare Function DrawIcon Lib "user32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal hIcon As Long) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long) As Long
Private Sub Command1_Click()
Dim hdc As Long
Dim sw As Integer
Dim sh As Integer
Dim CurPos As POINTAPI
Dim Cur As Long
Me.Hide
DoEvents
Picture1.AutoRedraw = True
hdc = GetDC(0)
GetCursorPos CurPos
Cur = GetCursor
Picture1.Width = Screen.Width
Picture1.Height = Screen.Height
sw = Screen.Width / Screen.TwipsPerPixelX
sh = Screen.Height / Screen.TwipsPerPixelY
BitBlt Picture1.hdc, 0, 0, sw, sh, hdc, 0, 0, vbSrcCopy
Me.Show
DrawIcon Picture1.hdc, CurPos.x - 10, CurPos.y - 10, Cur
ReleaseDC 0, hdc
Picture1.AutoRedraw = False
以下放到模块里：
Option Explicit
Type RECT_Type
left As Long
top As Long
right As Long
bottom As Long
End Type
'The following declare statements are case sensitive.
Declare Function GetActiveWindow Lib "User32" () As Long
Declare Function GetDesktopWindow Lib "User32" () As Long
Declare Sub GetWindowRect Lib "User32" (ByVal Hwnd As Long, _
lpRect As RECT_Type)
Declare Function GetDC Lib "User32" (ByVal Hwnd As Long) As Long
Declare Function CreateCompatibleDC Lib "Gdi32" (ByVal hdc As Long) _
As Long
Declare Function CreateCompatibleBitmap Lib "Gdi32" (ByVal hdc _
As Long, ByVal nWidth As Long, _
ByVal nHeight As Long) As Long
Declare Function SelectObject Lib "Gdi32" (ByVal hdc As Long, _
ByVal hObject As Long) As Long
Declare Function BitBlt Lib "Gdi32" (ByVal hDestDC As Long, _
ByVal X As Long, ByVal Y _
As Long, ByVal nWidth As Long, _
ByVal nHeight As Long, _
ByVal hSrcDC As Long, _
ByVal XSrc As Long, _
ByVal YSrc As Long, _
ByVal dwRop As Long) As Long
Declare Function OpenClipboard Lib "User32" (ByVal Hwnd As Long) As Long
Declare Function EmptyClipboard Lib "User32" () As Long
Declare Function SetClipboardData Lib "User32" (ByVal wFormat As Long, _
ByVal hMem As Long) As Long
Declare Function CloseClipboard Lib "User32" () As Long
Declare Function ReleaseDC Lib "User32" (ByVal Hwnd As Long, _
ByVal hdc As Long) As Long
Declare Function DeleteDC Lib "Gdi32" (ByVal hdc As Long) As Long
Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Global Const SRCCOPY = HCC0020
Global Const CF_BITMAP = 2
Function ScreenDump()
Dim AccessHwnd As Long, DeskHwnd As Long
Dim hdc As Long
Dim hdcMem As Long
Dim rect As RECT_Type
Dim junk As Long
Dim fwidth As Long, fheight As Long
Dim hBitmap As Long
' DoCmd.Hourglass True
'---------------------------------------------------
' Get window handle to Windows and Microsoft Access
'---------------------------------------------------
DoEvents
DeskHwnd = GetDesktopWindow()
AccessHwnd = GetActiveWindow()
'---------------------------------------------------
' Get screen coordinates of Microsoft Access
'---------------------------------------------------
Call GetWindowRect(AccessHwnd, rect)
fwidth = rect.right - rect.left
fheight = rect.bottom - rect.top
'---------------------------------------------------
' Get the device context of Desktop and allocate memory
'---------------------------------------------------
hdc = GetDC(DeskHwnd)
hdcMem = CreateCompatibleDC(hdc)
hBitmap = CreateCompatibleBitmap(hdc, fwidth, fheight)
If hBitmap 0 Then
junk = SelectObject(hdcMem, hBitmap)
'---------------------------------------------
' Copy the Desktop bitmap to memory location
' based on Microsoft Access coordinates.
'---------------------------------------------
junk = BitBlt(hdcMem, 0, 0, fwidth, fheight, hdc, rect.left, _
rect.top, SRCCOPY)
'---------------------------------------------
' Set up the Clipboard and copy bitmap
'---------------------------------------------
junk = OpenClipboard(DeskHwnd)
junk = EmptyClipboard()
junk = SetClipboardData(CF_BITMAP, hBitmap)
junk = CloseClipboard()
End If
'---------------------------------------------
' Clean up handles
'---------------------------------------------
junk = DeleteDC(hdcMem)
junk = ReleaseDC(DeskHwnd, hdc)
' DoCmd.Hourglass False
End Function
这里是拖动鼠标的框里内容截取，你也可以改成固定范围的截取。
vb.net如何把image类的变量以png格式导出
REM 假设存在Image类型变量img
Dim bmp As Bitmap = CType(img, Bitmap) '先将Image类型强制转换为Bitmap类型
bmp.Save("C:\1.png", System.Drawing.Imaging.ImageFormat.Png) '以PNG格式存储到C:\1.png
求大神指点vb.net 怎么以指定方式打开图片呢?
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'建立新的系统进程
Dim process As New System.Diagnostics.Process()
If RadioButton1.Checked Then
'设置文件名，此处为图片的真实路径+文件名
process.StartInfo.FileName = "c:\a.bmp"
'设置进程运行参数
process.StartInfo.Arguments = "rundll32.exe shimgvw.dll"
Else
process.StartInfo.FileName = "mspaint.exe"
process.StartInfo.Arguments = "c:\a.bmp"
End If
'此项为是否使用Shell执行程序，因系统默认为true，此项也可不设，但若设置必须为true
'process.StartInfo.UseShellExecute = True
'此处可以更改进程所打开窗体的显示样式，可以不设
'process.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden
process.Start()
process.Close()
End Sub
VB.NET中如何使两个PictureBox显示指定相对应的图片？
用一个全局变量保存这个1.jpg，如变量a，你按按钮2时，可以简单的在a中插入一个"A"，如a.SubString(0, a.Length-4) "A" a.SubString(a.Length-4)，这样就能把例如"C:/Images/1.jpg"变成"C:/Images/1A.jpg"
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