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Tamas,<br>
<br>
In Perl the programmer can postpone loading the external DLL
required by a module. Thus a similar approach is viable in Perl. But
that's not how it's usually done. If you have a DLL in a system that
is meant for shared use then it should be in the system PATH. Thus I
believe the policy should be to set the PATH if GDAL is installed
into a system (as such - not as a part of something else). Only if a
package installs a private GDAL, it should be kept out of PATH and
the package executables need to take care of setting the PATH or
other env vars as appropriate (in Geoinformatica I do this - the
Geoinformatica installer is basically a file copy and no env vars
are changed).<br>
<br>
Ari<br>
<br>
6.1.2011 16:50, Tamas Szekeres kirjoitti:
<blockquote
cite="mid:AANLkTi=JrcZdsmC+VjyZ1VfhGAU5i1LRZCZmLuQCuEEq@mail.gmail.com"
type="cite">Ari<br>
<br>
The only wokaround which is satisfactory to me is to set the
required enviroment at run time before the gdal bindings are used.
In csharp we can do something like:<br>
<br>
string path =
Environment.GetEnvironmentVariable("PATH");<br>
if (!path.Contains(gdal_bin_path))<br>
{<br>
Environment.SetEnvironmentVariable("PATH",
gdal_bin_path + ";" + path);<br>
}<br>
Gdal.SetConfigOption("GDAL_DRIVER_PATH",
gdal_driver_path);<br>
<br>
But it requires that loading the gdal dll is happening when the
interface is used actually (in Gdal.SetConfigOption with the code
above). This is the case with the .NET runtime, but I'm not sure
how do we stand with the other bindings in this regard.<br>
<br>
Futher problem with this solution is that this startup code should
be placed in the user's script and not sure how this could be
implemented in the gdal bindings itself.<br>
<br>
Best regards,<br>
<br>
Tamas <br>
<br>
<br>
<br>
<br>
<div class="gmail_quote">2011/1/6 Ari Jolma <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:ari.jolma@gmail.com">ari.jolma@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div class="im">On 01/06/2011 03:25 PM, Tamas Szekeres wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<br>
Assuming we install the gdal-perl modules in a standard
location (not sure where it is), do we have a common
mechanism in the perl runtime to find the dependent dlls
without having to violate system wide settings (like the
PATH environment variable)?<br>
</blockquote>
<br>
</div>
:) I'm not completely satisfied (I'm also not sure I really
understand the whole f* issue) with how Perl searches for
dll's - especially dll import libs - in Windows.<br>
<br>
But that's configure/compile time issue. In compile time a
Perl GDAL dll (for the bindings) is created and put into some
location, which is known to Perl and Perl knows how to find it
in runtime.<br>
<br>
Assuming I've built the binaries, then in runtime (when the
GDAL module is called for) I think somebody (because the Perl
GDAL module dll has a link to GDAL dll that was put there in
compile time) asks for the GDAL dll's and they simply need to
be available. Thus, if there is GDAL in the system (for
example in c:\Program Files\Share\GDAL\bin) then that path
needs to be in the PATH - I don't think there is a way around
that. The PATH may be a temporary PATH set by somebody for
Perl programs, but I think the policy should be that when you
run GDAL.msi, the system default PATH is modified to have the
path to the GDAL binaries.<br>
<br>
Best regards,<br>
<font color="#888888">
<br>
Ari</font>
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<br>
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