Wow man, you must not really be the King of Laziness, cause this is awesome! I really appreciate your work. | [reply] |
Very nice and Very handy package.
I'm having a problem, however... :-)
In short, I'm trying to use Win32::API to call CreateProcess.
All is well except for the LPSTARTUPINFO and LPPROCESS_INFORMATION parms I pass into the call. If I create these using pack(...) for the correct number of bytes, it works fine and I can get the PID back out of the PROCESS_INFORMATION object (my ultimate goal).
If, however, I create these parms using the Win32::API::Struct->new( 'STARTUPINFO' ) approach, the call fails. I'm even setting the .cb field to the size of the structure. The error I get back (using Win32::GetLastError()) is "Invalid access to memory location". Here's the function call I'm making (same in both cases):
<-----------snip------------>
# version 1 - succeeds
my $si = pack( "L17", ((0) x 17) );
$si = pack( "LL16", length( $si ), ((0) x 16 ) );
my $pi = pack( "L4", ((0) x 4 ) );
# version 2 - fails
my $si = Win32::API::Struct->new( "STARTUPINFO" );
$si->{cb} = $si->sizeof();
my $pi = Win32::API::Struct->new( "PROCESS_INFORMATION" );
my $retval =
CreateProcess( "c:\\winnt\\notepad.exe",
0, # unused - cmdline ptr, unused
0, # unused - proc attributes ptr
0, # unused - thread attributes ptr
0, # unused - inherit handles
0, # unused - creation flags
0, # unused - env pointer
0, # unused - current dir ptr
$si,
$pi
);
<-----------snip------------>
Should CreateProcess be called the same way in both cases? When a ->new('STARTUPINFO') is called, is the memory zeroed-out upon creation? Any idea why the pack version succeeds and the Struct verion fails?
TIA!
D. Smith
| [reply]
[d/l] |
At least part of the problem is that Win32::API::Struct (or rather, Win32::API::Type) does have support for the STARTUPINFO structure, or at least not as of version 0.41 which is the latest version I can find.
The fact that you aren't receiving the warnings I get:
Unknown Win32::API::Struct 'STARTUPINFO' at - line 7
Can't call method "sizeof" on an undefined value at - line 8, <DATA> l
+ine 164.
means that either
- you don't have warnings enabled.
If so, turn them on, it'll save you much grief:)
- You have a later version of the package than I have been able to find.
If so, which version is it and where can I get a copy:)
- You have a (locally?) modified copy of the package.
If so, consult the people that made the modifications.
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." -Richard Buckminster Fuller
If I understand your problem, I can solve it! Of course, the same can be said for you.
| [reply]
[d/l] |