如何将richtextbox 中的内容打印到picturebox 中，并在pictruebox中分页显示？（高手试试））

[跟着Jacky学AI]

[zslwp]

要用到四个控件（二个PictureBox,一个VScroll，一个CommandBottun).
即picBox1,picBox2,VScroll1,用Picbox1容器里放一VScroll1和Picbox2.
属性：Command1.caption="OutPut To Pic"
(picbox1,picbox2).Autoredraw=True
(picbox2.scalemode=3)
代码如下：

Command1_click()
Pitcure.Print RichBox.text
if Picbox2.CurrentY > PicBox2.Heigh then
Picbox2.top =Picbox2+139//**139大概为一行**//
picbox2.height=picbox.height+140
同时初始化VScroll1.Value:Max:Min

End Sub

在VScroll_Change()加入滚动代码即可实现。

[wqb]

通过richtextbox.text属性获得要打印的文本，picturebox的CurrentX和CurrentY属性设置要打印文本的开始位置。换行等只要加上换行符(chr(13))后系统可以自动控制，你要做的就是确定每一行要打多少字，然后把获得的richtextbox.text再要换行的地方添加上换行符。至于分页，你记下上一页的位置，重新打不就可以了吗？

[跟着Jacky学AI]

我的分全在 这里了，高手来抢啊！！！！！！！

[跟着Jacky学AI]

我已经实现了除打印分页的所有功能，现在问题是怎样将打印到 picturebox 中的内容分页？
我发现打印到picturebox 中的内容不管怎样，只能显示一页！请问有其他方法将richtextbox 的内容分页预览并打印预览吗？

[跟着Jacky学AI]

我要打印的内容是图文混编的！！请高手指教！！！

[progame]

GZ

[TechnoFantasy]

MSDN上有范例，将RTF内容预览到PictureBox上：

SUMMARY
The SelPrint method of the RichTextBox control does not allow a programmer to set the position of the output on the printer. In addition, the RichTextBox control does not provide a method for displaying its contents as they would show up on the printer. This article explains how to set up a RichTextBox with a WYSIWYG (What You See Is What You Get) display and then how to print it.



MORE INFORMATION
The Visual Basic RichTextBox control is a sub-classed control based on the RichTextBox provided by the Win32 operating system. The operating system control supports many messages that are not exposed in Visual Basic. One of these messages is EM_SETTARGETDEVICE. The EM_SETTARGETDEVICE message is used to tell a RichTextBox to base its display on a target device such as a printer. Another message that is not fully exposed by Visual Basic is EM_FORMATRANGE. The EM_FORMATRANGE message sends a page at a time to an output device using the specified coordinates. Using these messages in Visual Basic, it is possible to make a RichTextBox support WYSIWYG display and output.

The following example illustrates how to take advantage of the EM_SETTARGETDEVICE and EM_FORMATRANGE messages from Visual Basic. The example provides two re-usable procedures to send these messages. The first procedure WYSIWYG_RTF() sets a RichTextBox to provide a WYSIWYG display based on the default printer and specified margins. The second procedure PrintRtf() prints the contents of the RichTextBox with the specified margins.

EXAMPLE
Start a new project in the Visual Basic 32-bit edition. Form1 is created by default.


Put a CommandButton and a RichTextBox control on Form1.


Add the following code to Form1:


Private Const AnInch As Long = 1440 '1440 twips per inch
Private Const QuarterInch As Long = 360

Private Sub Form_Load()
Dim PrintableWidth As Long
Dim PrintableHeight As Long
Dim x As Single

' Initialize Form and Command button
Me.Caption = "Rich Text Box WYSIWYG Printing Example"
Command1.Move 10, 10, 600, 380
Command1.Caption = "&Print"

' Set the font of the RTF to a TrueType font for best results
RichTextBox1.SelFontName = "Arial"
RichTextBox1.SelFontSize = 10

'initialize the printer object
x = Printer.TwipsPerPixelX
Printer.Orientation = vbPRORPortrait 'vbPRORLandscape

' Tell the RTF to base it's display off of the printer
Call WYSIWYG_RTF(RichTextBox1, QuarterInch, QuarterInch, QuarterInch, QuarterInch, PrintableWidth, PrintableHeight) '1440 Twips=1 Inch

' Set the form width to match the line width
Me.Width = PrintableWidth + 200
Me.Height = PrintableHeight + 800
End Sub

Private Sub Form_Resize()
' Position the RTF on form
RichTextBox1.Move 100, 500, Me.ScaleWidth - 200, Me.ScaleHeight - 600
End Sub

Private Sub Command1_Click()
' Print the contents of the RichTextBox with a one inch margin
PrintRTF RichTextBox1, AnInch, AnInch, AnInch, AnInch
End Sub

Insert a new standard module into the project, Module1.bas is created by default.


Add the following code to Module1:


Option Explicit

Private Type Rect
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type

Private Type CharRange
cpMin As Long ' First character of range (0 for start of doc)
cpMax As Long ' Last character of range (-1 for end of doc)
End Type

Private Type FormatRange
hdc As Long ' Actual DC to draw on
hdcTarget As Long ' Target DC for determining text formatting
rc As Rect ' Region of the DC to draw to (in twips)
rcPage As Rect ' Region of the entire DC (page size) (in twips)
chrg As CharRange ' Range of text to draw (see above declaration)
End Type

Private Const WM_USER As Long = &H400
Private Const EM_FORMATRANGE As Long = WM_USER + 57
Private Const EM_SETTARGETDEVICE As Long = WM_USER + 72
Private Const PHYSICALOFFSETX As Long = 112
Private Const PHYSICALOFFSETY As Long = 113

Private Declare Function GetDeviceCaps Lib "gdi32" ( _
ByVal hdc As Long, ByVal nIndex As Long) As Long
Private Declare Function SendMessage Lib "USER32" Alias "SendMessageA" _
(ByVal hWnd As Long, ByVal msg As Long, ByVal wp As Long, _
lp As Any) As Long
Private Declare Function CreateDC Lib "gdi32" Alias "CreateDCA" _
(ByVal lpDriverName As String, ByVal lpDeviceName As String, _
ByVal lpOutput As Long, ByVal lpInitData As Long) As Long

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
' WYSIWYG_RTF - Sets an RTF control to display itself the same as it
' would print on the default printer
'
' RTF - A RichTextBox control to set for WYSIWYG display.
'
' LeftMarginWidth - Width of desired left margin in twips
'
' RightMarginWidth - Width of desired right margin in twips
'
' Returns - The length of a line on the printer in twips
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Public Sub WYSIWYG_RTF(RTF As RichTextBox, LeftMarginWidth As Long, RightMarginWidth As Long, TopMarginWidth As Long, BottomMarginWidth As Long, PrintableWidth As Long, PrintableHeight As Long)
Dim LeftOffset As Long
Dim LeftMargin As Long
Dim RightMargin As Long
Dim TopOffset As Long
Dim TopMargin As Long
Dim BottomMargin As Long
Dim PrinterhDC As Long
Dim r As Long

' Start a print job to initialize printer object
Printer.Print Space(1)
Printer.ScaleMode = vbTwips

' Get the left offset to the printable area on the page in twips
LeftOffset = GetDeviceCaps(Printer.hdc, PHYSICALOFFSETX)
LeftOffset = Printer.ScaleX(LeftOffset, vbPixels, vbTwips)

' Calculate the Left, and Right margins
LeftMargin = LeftMarginWidth - LeftOffset
RightMargin = (Printer.Width - RightMarginWidth) - LeftOffset

' Calculate the line width
PrintableWidth = RightMargin - LeftMargin

' Get the top offset to the printable area on the page in twips
TopOffset = GetDeviceCaps(Printer.hdc, PHYSICALOFFSETY)
TopOffset = Printer.ScaleX(TopOffset, vbPixels, vbTwips)

' Calculate the Left, and Right margins
TopMargin = TopMarginWidth - TopOffset
BottomMargin = (Printer.Height - BottomMarginWidth) - TopOffset

' Calculate the line width
PrintableHeight = BottomMargin - TopMargin


' Create an hDC on the Printer pointed to by the Printer object
' This DC needs to remain for the RTF to keep up the WYSIWYG display
PrinterhDC = CreateDC(Printer.DriverName, Printer.DeviceName, 0, 0)

' Tell the RTF to base it's display off of the printer
' at the desired line width
r = SendMessage(RTF.hWnd, EM_SETTARGETDEVICE, PrinterhDC, _
ByVal PrintableWidth)

' Abort the temporary print job used to get printer info
Printer.KillDoc
End Sub

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
' PrintRTF - Prints the contents of a RichTextBox control using the
' provided margins
'
' RTF - A RichTextBox control to print
'
' LeftMarginWidth - Width of desired left margin in twips
'
' TopMarginHeight - Height of desired top margin in twips
'
' RightMarginWidth - Width of desired right margin in twips
'
' BottomMarginHeight - Height of desired bottom margin in twips
'
' Notes - If you are also using WYSIWYG_RTF() on the provided RTF
' parameter you should specify the same LeftMarginWidth and
' RightMarginWidth that you used to call WYSIWYG_RTF()
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Public Sub PrintRTF(RTF As RichTextBox, LeftMarginWidth As Long, _
TopMarginHeight, RightMarginWidth, BottomMarginHeight)
Dim LeftOffset As Long, TopOffset As Long
Dim LeftMargin As Long, TopMargin As Long
Dim RightMargin As Long, BottomMargin As Long
Dim fr As FormatRange
Dim rcDrawTo As Rect
Dim rcPage As Rect
Dim TextLength As Long
Dim NextCharPosition As Long
Dim r As Long

' Start a print job to get a valid Printer.hDC
Printer.Print Space(1)
Printer.ScaleMode = vbTwips

' Get the offsett to the printable area on the page in twips
LeftOffset = Printer.ScaleX(GetDeviceCaps(Printer.hdc, _
PHYSICALOFFSETX), vbPixels, vbTwips)
TopOffset = Printer.ScaleY(GetDeviceCaps(Printer.hdc, _
PHYSICALOFFSETY), vbPixels, vbTwips)

' Calculate the Left, Top, Right, and Bottom margins
LeftMargin = LeftMarginWidth - LeftOffset
TopMargin = TopMarginHeight - TopOffset
RightMargin = (Printer.Width - RightMarginWidth) - LeftOffset
BottomMargin = (Printer.Height - BottomMarginHeight) - TopOffset

' Set printable area rect
rcPage.Left = 0
rcPage.Top = 0
rcPage.Right = Printer.ScaleWidth
rcPage.Bottom = Printer.ScaleHeight

' Set rect in which to print (relative to printable area)
rcDrawTo.Left = LeftMargin
rcDrawTo.Top = TopMargin
rcDrawTo.Right = RightMargin
rcDrawTo.Bottom = BottomMargin

' Set up the print instructions
fr.hdc = Printer.hdc ' Use the same DC for measuring and rendering
fr.hdcTarget = Printer.hdc ' Point at printer hDC
fr.rc = rcDrawTo ' Indicate the area on page to draw to
fr.rcPage = rcPage ' Indicate entire size of page
fr.chrg.cpMin = 0 ' Indicate start of text through
fr.chrg.cpMax = -1 ' end of the text

' Get length of text in RTF
TextLength = Len(RTF.Text)

' Loop printing each page until done
Do
' Print the page by sending EM_FORMATRANGE message
NextCharPosition = SendMessage(RTF.hWnd, EM_FORMATRANGE, True, fr)
If NextCharPosition >= TextLength Then Exit Do 'If done then exit
fr.chrg.cpMin = NextCharPosition ' Starting position for next page
Printer.NewPage ' Move on to next page
Printer.Print Space(1) ' Re-initialize hDC
fr.hdc = Printer.hdc
fr.hdcTarget = Printer.hdc
Loop

' Commit the print job
Printer.EndDoc

' Allow the RTF to free up memory
r = SendMessage(RTF.hWnd, EM_FORMATRANGE, False, ByVal CLng(0))
End Sub

Save the project.


Run the project.


Enter or paste some text into the RichTextBox.


Press the Print command button. Note that the printed output should word-wrap at the same locations as displayed on the screen. Also, the output should be printed with the specified one-inch margin all around.