what is wrong with this code ?
I get this printing code here and tried to contact the original writer, but couldn't.
I usually use this code inder JDK1.3.1, but for deployement reasons, i have to use
JDK1.2 in order to create an exe file under VisualCafe Expert 4.5.
The printing code work well under JDK1.3.1 but when i run it as an executable file,
i get the following error :
Exception occurred during event dispatching:
java.lang.IllegalArgumentException: Zero length string passed to TextLayout constructor.
at java.awt.font.TextLayout.<init>(TextLayout.java:337)
at sun.java2d.PeekGraphics.drawString(PeekGraphics.java:845)
at MyPrinter$MyPrintable.print(MyPrinter.java:204)
at sun.java2d.RasterPrinterJob.printPage(RasterPrinterJob.java:485)
at sun.java2d.RasterPrinterJob.print(RasterPrinterJob.java:235)
at MyPrinter.run(MyPrinter.java:55)
at MyPrinter.printFile(MyPrinter.java:32)
here is the code i use for it :
import java.awt.*;
import java.awt.print.*;
import java.io.*;
import javax.swing.*;
publicclass MyPrinterimplements Runnable
{
protected PrinterJob job;
protected MyPrintable myPrint =new MyPrintable();
protected MyPageable myPage =new MyPageable();
//protected MyDialog dialog = new MyDialog();
protected RandomAccessFile raf;
protected String fileName;
protected File printFile;
protectedint numPages = 0;
protectedint[] lastFilePositions;
// private Thread myThread = null;
public MyPrinter(){}// end constructor
publicvoid printFile(String name)
{
// gives error message if file doesn't exist!
printFile =new File(name);
fileName = name;
if((printFile.exists()) && (printFile.canRead()))
{
this.run();
//myThread = new Thread(this);
//myThread.start();
}// end if
else
{
return;
}// end else
}// end printFile
publicvoid run()
{
numPages = findNumPages();
job = PrinterJob.getPrinterJob();
job.setPageable(myPage);// this is an instance of Pageable
if(job.printDialog())
{
// user didn't cancel the printing
try
{
job.print();
try
{
raf.close();
}// end try
catch(IOException e)
{
//dialog.showError("Fehler: "+e.getMessage(), "Problem");
//e.printStackTrace();
System.exit(1);
}// end catch
}// end try
catch (PrinterException pe)
{
//dialog.showError("Fehler: "+pe.getMessage(), "Problem");
//pe.printStackTrace();
System.exit(1);
}// end catch
}// end if
}// end run
privateint findNumPages()
{
try
{
numPages = 0;
raf =new RandomAccessFile(fileName,"r");
int fileLength = (int)printFile.length();
int lineNumber = 0;
while((int)raf.getFilePointer() < fileLength)
{
lineNumber = 0;
while((((int)raf.getFilePointer()) < fileLength) && (lineNumber < 43))
{
raf.readLine();
lineNumber++;
}// end while loop
numPages++;
}// end while loop
raf.seek(0);
lastFilePositions =newint[numPages];
intializeLastFilePositions();
}// end try
catch(IOException e)
{
//dialog.showError("Fehler: "+e.getMessage(), "Problem");
//e.printStackTrace();
System.exit(0);
}// end catch
return numPages;
}// end findNumPages
privatevoid intializeLastFilePositions()
{
for(int i = 0; i < lastFilePositions.length; i++)
{
lastFilePositions[i] = 0;
}// end for loop
}// end intializeLastFilePositions
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
publicclass MyPageableimplements Pageable
{
public Printable getPrintable(int pageIndex)
{
return myPrint;
}// end getPrintable
public PageFormat getPageFormat(int pageIndex)
{
PageFormat pf =new PageFormat();
pf.setOrientation(PageFormat.PORTRAIT);
return pf;
}// end getPageFormat
publicint getNumberOfPages()
{
return numPages;// test
//return ((int)printFile.length()/4000); // assume 4KB per page
}// end getNumberOfPages
}// end MyPageable class
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
publicclass MyPrintableimplements Printable
{
private Font fnt =new Font("Serif", Font.PLAIN, 10);
protectedint startAtLineNumber = 0;
publicint print(Graphics g, PageFormat pf,int pageIndex)throws PrinterException
{
// pageIndex # corresponds to page number # + 1
pf.setOrientation(PageFormat.PORTRAIT);
if(pageIndex > numPages)
return NO_SUCH_PAGE;
else
{
if(pageIndex == 0)
{
startAtLineNumber = 0;
}// end if
else
{
startAtLineNumber = lastFilePositions[pageIndex-1];
}// end else
g.setFont(fnt);
g.setColor(Color.black);
String oneLine;
int x = 75, y = 80, lineNum = 0;
try
{
raf.seek(startAtLineNumber);
int fileLength = (int)printFile.length();
while((((int)raf.getFilePointer()) < fileLength) && (lineNum < 43))
{
oneLine = raf.readLine();
if(oneLine.length() > 130)
{
// wrap lines if one line is too long
String secondLine = oneLine.substring(130, oneLine.length());
oneLine = oneLine.substring(0, 130);
g.drawString(oneLine, x, y);
y += 15;
g.drawString(secondLine, x, y);
y += 15;
}// end if
else
{
// line fit on one line
g.drawString(oneLine, x, y);
y += 15;
}// end else
lineNum++;
}// end while loop
lastFilePositions[pageIndex] = (int)raf.getFilePointer();
}// end try
catch(IOException e)
{
//dialog.showError("Fehler: "+e.getMessage(), "Problem");
//e.printStackTrace();
System.exit(0);
}// end catch
return Printable.PAGE_EXISTS;
}// end else
}// end print
}// end MyPrintable class
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
}// end MyPrinter class
The printdialog is showing and saied me the number of pages to print (at least one)
but when i accept it, the exception is thrown.
Thanks for any help in correcting this code, I haven't succesfully understood the printing system
in Java when there is multiple pages.
PS: sorry i haven't no more duke dollards available.
