----- Original Message -----
Sent: Tuesday, April 16, 2002 1:59
AM
Subject: [java-list] Bug?
Tenho um exemplo de impressão que
funcionava na versão 1.3. Agora é gerada uma excessão em tempo de execução e é
gerado também um arquivo de log contendo o seguinte (mais abaixo está o
código):
An unexpected
exception has been detected in native code outside the VM.
Unexpected
Signal : EXCEPTION_ACCESS_VIOLATION occurred at
PC=0x6D081C73
Function=[Unknown.]
Library=(N/A)
NOTE: We are unable to locate the
function name symbol for the error
just
occurred. Please refer to release documentation for
possible
reason and solutions.
Current Java
thread:
at sun.awt.windows.WPrinterJob.setNativePrintService(Native
Method)
at
sun.awt.windows.WPrinterJob.setPrintService(WPrinterJob.java:384)
at
sun.print.RasterPrinterJob.getPrintService(RasterPrinterJob.java:353)
at
sun.awt.windows.WPrinterJob.getPrintService(WPrinterJob.java:408)
at
sun.print.PrintJob2D.findNamedPrintService(PrintJob2D.java:187)
at
sun.print.PrintJob2D.copyAttributes(PrintJob2D.java:223)
at
sun.print.PrintJob2D.printDialog(PrintJob2D.java:176)
at
sun.awt.windows.WToolkit.getPrintJob(WToolkit.java:600)
at
sun.awt.windows.WToolkit.getPrintJob(WToolkit.java:586)
at
Main.actionPerformed(Main.java:70)
at
java.awt.Button.processActionEvent(Button.java:381)
at
java.awt.Button.processEvent(Button.java:350)
at
java.awt.Component.dispatchEventImpl(Component.java:3526)
at
java.awt.Component.dispatchEvent(Component.java:3367)
at
java.awt.EventQueue.dispatchEvent(EventQueue.java:445)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:190)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
at
java.awt.EventDispatchThread.run(EventDispatchThread.java:98)
Dynamic libraries:
0x7D230000 -
0x7D25D000 C:\WINDOWS\SYSTEM\DBGHELP.DLL
Local Time = Tue Apr 16
01:57:24 2002
Elapsed Time = 9
#
# The exception above was detected
in native code outside the VM
#
# Java VM: Java HotSpot(TM) Client VM
(1.4.0-b92 mixed mode)
#
O código é o seguinte:
import java.awt.*;
import
java.awt.event.*;
import java.io.*;
import java.util.*;
import
java.text.*;
class Main extends Frame implements
ActionListener {
int curPointSize =
12;
String filename;
Vector lines
= new Vector();
Button printBtn = new
Button("Print...");
TextField pointSize = new
TextField("" + curPointSize);
TextField pageNum = new
TextField("1");
Preview preview;
Main(String filename)
{
super("PrintJob
Example");
// Remember the
filename.
this.filename =
filename;
//
Read the file into lines.
try
{
String
line;
BufferedReader fis = new
BufferedReader(
new InputStreamReader(new
FileInputStream(filename)));
while ((line = fis.readLine()) != null)
{
lines.addElement(line);
}
fis.close();
} catch (Exception
e) {
e.printStackTrace();
}
// Listen for
events.
pageNum.addActionListener(this);
pointSize.addActionListener(this);
printBtn.addActionListener(this);
//
Layout and show components.
Panel
p = new Panel(new FlowLayout());
p.add(new Label("Page:", Label.RIGHT));
p.add(pageNum);
p.add(new Label("Point Size:",
Label.RIGHT));
p.add(pointSize);
p.add(printBtn);
add(p,
BorderLayout.NORTH);
//
Create and prepare the preview
component.
preview = new
Preview(filename, lines);
add(preview,
BorderLayout.CENTER);
preview.setFont(new Font("Monospaced", Font.PLAIN,
curPointSize));
pack();
show();
}
public void
actionPerformed(ActionEvent evt)
{
if (evt.getSource() ==
pageNum)
{
// Set
the
page.
preview.setPage(Integer.parseInt(pageNum.getText())-1);
} else if (evt.getSource() == pointSize)
{
// Set
the point
size.
curPointSize =
Integer.parseInt(pointSize.getText());
preview.setFont(new Font("Monospaced", Font.PLAIN,
curPointSize));
} else if
(evt.getSource() == printBtn)
{
//
Print the
file.
Properties props = new
Properties();
PrintJob pj = getToolkit().getPrintJob(this, filename, props);
if (pj != null)
{
// Print out any
properties.
for (Enumeration e = props.propertyNames() ;
e.hasMoreElements() ;)
{
System.out.println(e.nextElement());
}
Graphics pjG =
pj.getGraphics();
int pages = preview.getPageCount(pjG);
// Always print even number of
pages.
if (pages % 2 == 1)
{
pages++;
}
for (int i=0; i<pages; i += 2)
{
if (pjG == null)
{
pjG =
pj.getGraphics();
}
if (pj.lastPageFirst())
{
preview.print(pjG,
pages-i-2);
} else
{
preview.print(pjG,
i);
}
pjG.dispose();
pjG =
null;
}
pj.end();
}
}
}
public static void
main(String[] args) {
if
(args.length == 1)
{
new
Main(args[0]);
} else
{
System.err.println("Usage: java Main <text
file>");
}
}
}
class Preview extends Component
{
int page;
String
filename;
Font headerFont = new Font("Serif", Font.BOLD,
14);
Font font;
Vector
lines;
Preview(String filename,
Vector lines) {
this.filename =
filename;
this.lines =
lines;
}
// Sets the font and repaints
the display.
public void setFont(Font f)
{
font =
f;
repaint();
}
// p is
0-based.
void setPage(int p)
{
page =
p;
repaint();
}
// Returns the page count
relative to the metrics in g.
int getPageCount(Graphics
g) {
prepareLayoutValues(g);
return
(brokenLines.size()-1) / linesPerPage + 1;
}
// Prints the page p and
p+1.
// p is 0-based.
public void
print(Graphics g, int p) {
page
= p;
paint(g);
}
public void paint(Graphics g)
{
prepareLayoutValues(g);
g.setFont(headerFont);
FontMetrics fm = g.getFontMetrics();
//
Draw the filename.
g.drawString(filename, boxRect.x,
fm.getHeight()/2+fm.getAscent());
//
Draw the date and page number.
g.drawString(
DateFormat.getDateTimeInstance().format(new
Date()),
boxRect.x + pageRect.width, fm.getHeight()/2+fm.getAscent());
for (int p=0; p<2; p++)
{
if
(page + p >= (brokenLines.size()-1) / linesPerPage + 1)
{
break;
}
// Draw
page
number.
String s = "" + (page + p +
1);
g.setFont(headerFont);
fm =
g.getFontMetrics();
g.drawString(s,
boxRect.x + p*pageRect.width + boxRect.width -
fm.stringWidth(s),
fm.getHeight()/2+fm.getAscent());
g.drawRect(boxRect.x + p*pageRect.width,
boxRect.y, boxRect.width-1, boxRect.height-1);
// Find the starting line on the current
page.
int l = Math.min(brokenLines.size(), (page+p) *
linesPerPage);
g.setFont(font);
fm =
g.getFontMetrics();
int x = listingRect.x +
p*pageRect.width;
int y = listingRect.y +
fm.getAscent();
for (int i=0; i<linesPerPage && l+i < brokenLines.size(); i++)
{
s = (String)brokenLines.elementAt(l + i);
if (s.length() > charsPerLine)
{
int charWidth =
fm.charWidth('M');
s = s.substring(0, charsPerLine);
// Draw the continuation
symbol.
g.drawArc(
listingRect.x+charsPerLine*charWidth +
p*pageRect.width,
y-fm.getAscent()+fm.getHeight()/2,
charWidth,
fm.getHeight()/2,
45,
-180);
}
g.drawString(s, x,
y);
y +=
fm.getHeight();
}
}
}
// External margin in which
the printer cannot print.
int pageMargin;
// Internal margin between
boxes and text.
int margin = 10;
Insets margins = new Insets(10, 10, 10, 10);;
// Bounds which includes the
header, box, and listing.
Rectangle
pageRect;
// The bounds of the
box.
Rectangle boxRect;
// The bounds of the
listing. This rectangle strictly contains
// the
text and not the continuation character.
Rectangle
listingRect;
// Number of characters per
line.
int charsPerLine;
// Number of lines per
page.
int linesPerPage;
// The lines after they have
been broken so they fit within charsPerLine.
Vector
brokenLines;
// This method calculates and
sets up all the fields above
// based on the metrics in
g.
void prepareLayoutValues(Graphics g)
{
Dimension
pageSize;
int res;
if (g
instanceof PrintGraphics)
{
PrintJob pj =
((PrintGraphics)g).getPrintJob();
res =
pj.getPageResolution();
pageSize = pj.getPageDimension();
// getPageDimension() does not return the correct
result.
// The following is a
workaround.
res =
getToolkit().getScreenResolution();
pageSize = new Dimension((int)(8.5 * res), 11 *
res);
} else
{
res =
getToolkit().getScreenResolution();
pageSize = new Dimension((int)(8.5 * res), 11 *
res);
}
pageMargin = (int)(.75 *
res);
pageSize = new
Dimension(pageSize.height-pageMargin,
pageSize.width-pageMargin);
//
Reserve space for the header.
FontMetrics fm = g.getFontMetrics(headerFont);
pageRect = new Rectangle(0, 0, pageSize.width/2,
pageSize.height);
boxRect =
inset(pageRect, margin, 2*fm.getHeight(), margin,
0);
listingRect = inset(boxRect,
margin, margin, margin, margin);
//
Set up listing font.
fm =
g.getFontMetrics(font);
int
lpp =
listingRect.height/fm.getHeight();
int cpp = listingRect.width/fm.charWidth('M');
//
The metrics have changed so recompute the broken
lines.
if (lpp != linesPerPage
|| cpp != charsPerLine)
{
brokenLines = new
Vector();
for (int i=0; i<lines.size(); i++)
{
String s = (String)lines.elementAt(i);
while (s.length() > cpp)
{
brokenLines.addElement(s.substring(0,
cpp)+"+");
s =
s.substring(cpp);
}
brokenLines.addElement(s);
}
linesPerPage =
lpp;
charsPerLine = cpp;
}
}
Rectangle inset(Rectangle r,
int left, int top, int right, int bottom)
{
Rectangle s = new
Rectangle(r);
s.x +=
left;
s.y +=
top;
s.width -=
left+right;
s.height -=
top+bottom;
return
s;
}
}
