问题
I am writing some code for driving Internet Explorer from a Perl 5 program through Win32::OLE, and I am looking for ways to convert numeric status/error codes that are delivered back to the Perl program via events (such as NavigateError) into a somewhat more human-readable form.
Is there some kind of library function that converts i.e. 0x800C0005L or -2146697211 to "INET_E_RESOURCE_NOT_FOUND"
or something even more readable?
I have tried Win32::FormatMessage()
, but that seems to work only for non application-specific error conditions.
Update: Here is some example code for clarification. Some test output is shown below.
#!/usr/bin/perl
use strict;
use warnings;
use 5.010;
use Time::HiRes qw(sleep time);
use Win32::OLE qw(EVENTS);
use Win32::OLE::Variant;
$|++;
sub ie_browse {
my $url = shift;
my $ie = Win32::OLE->new('InternetExplorer.Application') or die;
Win32::OLE->WithEvents($ie,
sub {
my ($obj, $event, @args) = @_;
given ($event) {
when ('NavigateComplete2') {
push @extra,
'url='.($args[1]->As(VT_BSTR));
say "$event: @extra";
}
when ('NavigateError') {
push @extra,
'url='.($args[1]->As(VT_BSTR)),
'statuscode='.($args[3]->As(VT_I4));
say "$event: @extra";
}
}
}, 'DWebBrowserEvents2');
Win32::OLE->SpinMessageLoop;
$ie->{visible} = 1;
Win32::OLE->SpinMessageLoop;
$ie->Navigate2($url);
Win32::OLE->SpinMessageLoop;
while(1) {
Win32::OLE->SpinMessageLoop;
sleep(0.1);
}
}
ie_browse $ARGV[0];
Here is some output for two fetch attempt. Fetching the Stack Overflow page is successful, of course.
C:\Documents and Settings\nobody\Desktop>perl ie.pl http://stackoverflow.com/
NavigateComplete2: url=http://stackoverflow.com/
Terminating on signal SIGINT(2)
But example.invalid
doesn't exist.
C:\Documents and Settings\nobody\Desktop>perl ie.pl http://example.invalid/
NavigateError: url=http://example.invalid/ statuscode=-2146697211
NavigateComplete2: url=http://example.invalid/
Terminating on signal SIGINT(2)
I am interested in turning that numeric value (-2146697211) that has been passed back into something useful. This is not an OLE error as such but an error condition signaled by the Internet Explorer COM object.
回答1:
Update: In light of your comment, I believe you are looking for Microsoft's documentation on the NavigateError event:
INET_E_INVALID_URL (0x800C0002L or -2146697214) INET_E_NO_SESSION (0x800C0003L or -2146697213) INET_E_CANNOT_CONNECT (0x800C0004L or -2146697212) ...
You could create a module by parsing this list:
package Win32::WebBrowserControl::ErrorMnemonics;
use strict;
use warnings;
my %lookup;
sub import {
my $class = shift;
while ( my $x = <DATA> ) {
my ($mnemonic, $code) = ( $x =~ m{
^(INET_E_[A-Z_]+)
[ ]
\(
0x[[:xdigit:]]+L
[ ] or [ ]
(-[[:digit:]]+)
\)
}x ) or next;
$lookup{$code} = $mnemonic;
}
}
sub lookup {
my $self = shift;
return $lookup{shift()};
}
1;
__DATA__
INET_E_INVALID_URL (0x800C0002L or -2146697214)
INET_E_NO_SESSION (0x800C0003L or -2146697213)
INET_E_CANNOT_CONNECT (0x800C0004L or -2146697212)
INET_E_RESOURCE_NOT_FOUND (0x800C0005L or -2146697211)
INET_E_OBJECT_NOT_FOUND (0x800C0006L or -2146697210)
INET_E_DATA_NOT_AVAILABLE (0x800C0007L or -2146697209)
INET_E_DOWNLOAD_FAILURE (0x800C0008L or -2146697208)
INET_E_AUTHENTICATION_REQUIRED (0x800C0009L or -2146697207)
INET_E_NO_VALID_MEDIA (0x800C000AL or -2146697206)
INET_E_CONNECTION_TIMEOUT (0x800C000BL or -2146697205)
INET_E_INVALID_REQUEST (0x800C000CL or -2146697204)
INET_E_UNKNOWN_PROTOCOL (0x800C000DL or -2146697203)
INET_E_SECURITY_PROBLEM (0x800C000EL or -2146697202)
INET_E_CANNOT_LOAD_DATA (0x800C000FL or -2146697201)
INET_E_CANNOT_INSTANTIATE_OBJECT (0x800C0010L or -2146697200)
INET_E_REDIRECT_FAILED (0x800C0014L or -2146697196)
INET_E_REDIRECT_TO_DIR (0x800C0015L or -2146697195)
INET_E_CANNOT_LOCK_REQUEST (0x800C0016L or -2146697194)
INET_E_USE_EXTEND_BINDING (0x800C0017L or -2146697193)
INET_E_TERMINATED_BIND (0x800C0018L or -2146697192)
INET_E_INVALID_CERTIFICATE (0x800C0019L or -2146697191)
INET_E_CODE_DOWNLOAD_DECLINED (0x800C0100L or -2146696960)
INET_E_RESULT_DISPATCHED (0x800C0200L or -2146696704)
INET_E_CANNOT_REPLACE_SFP_FILE (0x800C0300L or -2146696448)
INET_E_CODE_INSTALL_BLOCKED_BY_HASH_POLICY (0x800C0500L or -2146695936)
INET_E_CODE_INSTALL_SUPPRESSED (0x800C0400L or -2146696192)
For OLE related errors, see the Win32::OLE documentation:
Win32::OLE->LastError()
The
LastError()
class method returns the last recorded OLE error. This is a dual value like the$!
variable: in a numeric context it returns the error number and in a string context it returns the error message. The error number is a signedHRESULT
value. Please use theHRESULT(ERROR)
function to convert an unsigned hexadecimal constant to a signedHRESULT
.
来源:https://stackoverflow.com/questions/1329706/internet-explorer-com-automation-converting-numeric-error-code-to-string