Примечание: Microsoft RichTextBox обеспечивает печать самого себя с помощью метода .SelPrint. К сожалению, данный метод не позволяет никоим образом вмешаться в процесс, например для печати на загловков страницы или установки отступов от края листа. Данный пример решает эту проблему, т.к. теперь Вы имеете полный контроль над процессом печати. | Код |
Public Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Public 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
Public 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
Public Const LOGPIXELSX = 88
Public Const LOGPIXELSY = 90
Public Const PHYSICALOFFSETX As Long = 112
Public Const PHYSICALOFFSETY As Long = 113
Public Const WM_USER As Long = &H400
Public Const EM_FORMATRANGE As Long = WM_USER + 57
Declare Function GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, ByVal nIndex As Long) As Long
Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal msg As Long, _
ByVal wp As Long, lp As Any) As Long
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, rcPage As RECT
Dim TextLength As Long, NextCharPos As Long
NextCharPos = 0
Printer.ScaleMode = vbTwips
' Get the offsett to the printable area on the page in twips
LeftOffset = GetDeviceCaps(Printer.hdc, PHYSICALOFFSETX) / GetDeviceCaps(Printer.hdc, LOGPIXELSX) * 1440
TopOffset = GetDeviceCaps(Printer.hdc, PHYSICALOFFSETY) / GetDeviceCaps(Printer.hdc, LOGPIXELSY) * 1440
' 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
' Get length of text in RTF
TextLength = Len(rtf.Text)
' Loop printing each page until done
Do
' 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.chrg.cpMin = NextCharPos ' Indicate start of text through
fr.chrg.cpMax = -1 ' end of the text
fr.rc = rcDrawTo ' Indicate the area on page to draw to
fr.rcPage = rcPage ' Indicate entire size of page
Printer.Print Space(1) ' Re-initialize hDC
' Print the page by sending EM_FORMATRANGE message
NextCharPosition = SendMessage(rtf.hwnd, EM_FORMATRANGE, True, fr)
If NextCharPos <= 0 Or NextCharPos >= TextLength Then Exit Do 'If done then exit
Printer.NewPage ' Move on to next page
Loop
' Commit the print job
Printer.EndDoc
' Allow the RTF to free up memory
SendMessage rtf.hwnd, EM_FORMATRANGE, False, ByVal CLng(0)
End Sub
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| Код |
' Напечатать содержимое RichTextBox'a с отступами в 1 дюйм (1440 twips) от края листа
PrintRTF RichTextBox1, 1440, 1440, 1440, 1440
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Источник: vb.astral.kiev.ua |
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