Shen
Novice
May 13, 2010, 11:19 AM
Post #1 of 3
(1666 views)
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 Error on Writing to PDF
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Hi Guys,
I just recently started to use perl and found it very useful. However, I have encountered a problem which I cannot solve. So here it is.
I am trying to extract a Blob file from a oracle database and input the data into a pdf file on my local machine. I have used DBI and FileHandle to do this. The code is like this:
our $gen_db = "dbi:Oracle:host=59.0.0.12;sid=somename";
my $conn = DBI->connect($gen_db, "user", "password", { RaiseError=>1, PrintError=>1, AutoCommit=>1 }) ||die $DBI::errstr;
$conn->{LongReadLen} = 2097152;
$conn->{LongTruncOk} = 1;
my $sql = qq(SELECT * FROM (select IMAGEID, FILENAME, PDFDOCUMENT from PIMAGECATALOG ORDER BY IMAGEID DESC) WHERE ROWNUM <=1);
$sth = $conn->prepare($sql);
$sth->execute();
my $filehandler = new FileHandle("container.pdf", "w") or die;
my @data;
if (@data = $sth->fetchrow_array()) {
print $data[0];
print " ";
print $data[1];
print "\n";
print $filehandler $data[2];
}
$filehandler->close();
#############end of file#####################
The oracle part went successfully, and it seems to input something into the pdf file. However, when I try to open the pdf file, it either give me a error "not enough information to display the image" or it display a blank page with nothing in there. I have checked the original file in the database is about 50k in size, but the file I got on my local machine is 51k. I also tried to just read a pdf file on my local machine and write all its content to another pdf file and the same thing occured. This is the code :
open(MYINPUTFILE, "<mypdf.pdf");# open for input
open(MYOUTFILE, ">container.pdf"); #open for write, append
my(@lines) = <MYINPUTFILE>; # read file into list
@lines = sort(@lines); # sort the list
print MYOUTFILE @lines;
close(MYOUTFILE);
close(MYINPUTFILE);
#############end of file#####################
I suppose this is something to do with the filehandle. Has anyone ever encountered the same problem before?
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