尝试在 Perl 中使用 ImageMagick 写入图像和缩略图时出现内部服务器错误

Question

此 Perl 脚本将图像上传到服务器，然后保存： - 适合 900x900 像素的画廊图片 - 方形图库缩略图 140x140 像素 - 在 js 文件中添加一行图像和缩略图名称

问题是，脚本有时有效，有时无效。它在每十次尝试中有一两次工作正常。当它不起作用时，它通常 returns "Internal Server Error" 并且不会创建两个文件，也不会在js中添加一行。但在某些情况下，它会创建两个 jpg 文件并且不会在 js 中添加一行（再次返回 "Internal Server Error"）。非常奇怪的行为 - 我尝试了各种更改但没有结果。我做错了什么？

#!/usr/bin/perl -w
##
##

use strict;
use CGI;
use CGI::Carp qw ( fatalsToBrowser );
use File::Basename;
use Image::Magick;

$CGI::POST_MAX = 1024 * 70000;
my $safe_filename_characters = "a-zA-Z0-9_.-";
my $pic_upload_dir="../data/photos/gallery";
my $lst_upload_dir="../data";
my $lst_file=$lst_upload_dir."/gallery.js";

my $query=new CGI;

my $PictureIndex=$query->param("Snd_AddPhoto_Idx");
my $photoname=$query->param("AddPhoto");

    #upload photo
    if ( !$photoname ) {  
        print "Content-Type: text/plain\n\n";
        print "\n\nThere was a problem uploading your photo (try a smaller size).\n";
        exit;
    }  

    my ( $phname, $phpath, $phextension ) = fileparse ($photoname, qr/\.[^.]*/);
    $photoname = $phname . $phextension;
    $photoname =~ tr/ /_/;
    $photoname =~ s/[^$safe_filename_characters]//g;

    if ( $photoname =~ /^([$safe_filename_characters]+)$/ ) {  
        $photoname = ;
    }  
    else {  
        die "Filename contains invalid characters";
    }  

        # force correct filename for temporary file
        $photoname="tempphoto_zmm_gallery_".$PictureIndex.$phextension;

    my $upload_photohandle = $query->upload("AddPhoto");

    open ( UPLOADPHOTO, ">$pic_upload_dir/$photoname" ) or die "$!";
    binmode UPLOADPHOTO;
    while ( <$upload_photohandle> ) {  
        print UPLOADPHOTO;
    }  
    close UPLOADPHOTO;

    # resize photo
    my($photoimage) = Image::Magick->new;
    open(PHOTOIMAGE, "$pic_upload_dir/$photoname") or die "Unable to open temporary image file!\n";
    $photoimage->Read(file=>\*PHOTOIMAGE);
    close(PHOTOIMAGE);

    $photoimage->Resize(geometry=>'900x900', blur=>0.8);
    $photoimage->Set(Quality=>'75%');

    # write ready photo as jpg
    my $readyphotoname="pic".$PictureIndex.".jpg";
    open(READYIMAGE, ">$pic_upload_dir/$readyphotoname") or die "Unable to write ready image file!\n";
    $photoimage->Write(file=>\*READYIMAGE, filename=>$readyphotoname);
    close(READYIMAGE);
    system("chmod 777 $pic_upload_dir/$readyphotoname");

    # resize thumbnail
    my($thumbimage) = Image::Magick->new;
    open(THUMBIMAGE, "$pic_upload_dir/$photoname") or die "Unable to open temporary image file!\n";
    $thumbimage->Read(file=>\*THUMBIMAGE);
    close(THUMBIMAGE);

    $thumbimage->Resize(geometry=>'140x140^', blur=>0.8);
    $thumbimage->Set(gravity=>'Center');
    $thumbimage->Crop(geometry=>'140x140+0+0');
    $thumbimage->Set(Quality=>'30%');

    # write ready thumbnail as jpg
    my $readythumbname="tbn".$PictureIndex.".jpg";
    open(READYTHUMB, ">$pic_upload_dir/$readythumbname") or die "Unable to write ready image file!\n";
    $thumbimage->Write(file=>\*READYTHUMB, filename=>$readythumbname);
    close(READYTHUMB);
    system("chmod 777 $pic_upload_dir/$readythumbname");

    # delete temporary file
    my($temporary_file)=$pic_upload_dir."/".$photoname;
    unlink($temporary_file) == 0;


# add pic in js gallery list

    # prepare new pic record
    my $NewGalRecord="GalleryList.push(new Array(\"pic".$PictureIndex.".jpg\",\"tbn".$PictureIndex.".jpg\",\"\",\"\"));\n";

    # add to file
    open(JS,">>$lst_file") || die "Failed to open $lst_file\n";
    printf JS $NewGalRecord;
    close JS;
    system("chmod 777 $lst_file");

# print confirmation

...
...
...


exit;

Answer 1

我想我已经解决了问题。显然不需要两次读取临时文件。保存 'big' 图像后，我们可以继续操作它，然后再次保存为缩略图。临时文件的双重读取显然会导致冲突。像 'Sharing violation' 这样的东西 - 只是在黑暗中拍摄。但现在脚本工作正常。另外，远远删除了行 Set(Quality=>)。我不知道他们是否与问题有关，但这将有待于未来的测试。以下是更改：

    # resize photo
    my($photoimage) = Image::Magick->new;
    open(PHOTOIMAGE, "$pic_upload_dir/$photoname") or die "Unable to open temporary image file!\n";
    $photoimage->Read(file=>\*PHOTOIMAGE);
    close(PHOTOIMAGE);

    $photoimage->Resize(geometry=>'900x900', blur=>0.8);

    # write ready photo as jpg
    my $readyphotoname="pic".$PictureIndex.".jpg";
    open(READYIMAGE, ">$pic_upload_dir/$readyphotoname") or die "Unable to write ready image file!\n";
    $photoimage->Write(file=>\*READYIMAGE, filename=>$readyphotoname);
    close(READYIMAGE);
    system("chmod 777 $pic_upload_dir/$readyphotoname");

    # resize thumbnail
    $photoimage->Resize(geometry=>'140x140^', blur=>0.8);
    $photoimage->Set(gravity=>'Center');
    $photoimage->Crop(geometry=>'140x140+0+0');

    # write ready thumbnail as jpg
    my $readythumbname="tbn".$PictureIndex.".jpg";
    open(READYTHUMB, ">$pic_upload_dir/$readythumbname") or die "Unable to write ready image file!\n";
    $photoimage->Write(file=>\*READYTHUMB, filename=>$readythumbname);
    close(READYTHUMB);
    system("chmod 777 $pic_upload_dir/$readythumbname");

    # delete temporary file
    my($temporary_file)=$pic_upload_dir."/".$photoname;
    unlink($temporary_file) == 0;

尝试在 Perl 中使用 ImageMagick 写入图像和缩略图时出现内部服务器错误

Internal server error when trying to write an image & an thumbnail using ImageMagick in Perl

image

perl

imagemagick

image-uploading

perlmagick