Problems with simple Apache module dll

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5 total messages Started by Matt Lowe Fri, 19 May 2006 15:17

#609

Author: Matt Lowe
Date: Fri, 19 May 2006 15:17

68 lines
2360 bytes

I'm trying to build a simple test module for Apache 2.2 -- just a plain old 
dll, no WebBroker or WebSnap or any of that.

When I try to load the module, I get the following error:

"Can't Locate API module structure 'hello_module' in file 
C:/Apache/modules/HelloModule.dll"

So far as I can tell, everything is set up correctly to export hello_module. 
(When I build the dll, Depends shows that the symbol "_hello_module" is 
being exported.)

So is there a problem with this symbol name? Or is there something else I'm 
missing?

The code for the module looks like this:

--Unit1.cpp--
#include <windows.h>
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"

#pragma argsused
int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void* 
lpReserved)
{
    return 1;
}

extern "C" {

static int  hello_handler(request_rec* r)
{
    ap_log_error(APLOG_MARK,APLOG_ERR,OK,NULL,"Testing hello handler");
    return OK;
}

static void  hello_hooks(apr_pool_t* pool)
{
    ap_hook_handler(hello_handler, NULL, NULL, APR_HOOK_MIDDLE);
}

module AP_MODULE_DECLARE_DATA hello_module =
{
    STANDARD20_MODULE_STUFF,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    hello_hooks
};

}

--

And the interesting part of my httpd.conf looks like this:

LoadModule hello_module modules/HelloModule.dll
<Location /helloc>
 SetHandler hello-handler
</Location>

-- 
Matt Lowe
Milsoft Utility Solutions

Re: Problems with simple Apache module dll

#610

Author: Matt Lowe
Date: Fri, 19 May 2006 16:09

14 lines
1377 bytes

Ok, I worked around the problem by changing my httpd.conf:

LoadModule _hello_module modules/HelloModule.dll

But is there a way to get builder to stop decorating the symbol name with 
the underscore?

Matt

"Matt Lowe" <dontspammatt@milsoft.com> wrote in message 
news:446de17a$1@newsgroups.borland.com...
> I'm trying to build a simple test module for Apache 2.2 -- just a plain 
> old dll, no WebBroker or WebSnap or any of that.
>

Re: Problems with simple Apache module dll

#611

Author: Michel Leunen
Date: Fri, 19 May 2006 19:08

16 lines
1463 bytes

Matt Lowe wrote:

> But is there a way to get builder to stop decorating the symbol name with 
> the underscore?

Yes, use the __stdcall calling convention for your exported function. By 
default the __cdecl convention is used.

Michel
-- 
----------------------------------------
Michel Leunen
mailto: see my homepage.
C++Builder, BCC5.5.1 Web site:
http://www.leunen.com/
----------------------------------------

Re: Problems with simple Apache module dll

#622

Author: Matt Lowe
Date: Tue, 23 May 2006 17:35

26 lines
1622 bytes

>> But is there a way to get builder to stop decorating the symbol name with 
>> the underscore?
>
> Yes, use the __stdcall calling convention for your exported function. By 
> default the __cdecl convention is used.

hello_module isn't a function, it's a struct. Anyhow, I tried setting 
__stdcall, but it doesn't seem to work:

module  __stdcall __declspec(dllexport) hello_module =
{
    STANDARD20_MODULE_STUFF,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    hello_hooks
};


Setting stdcall in project options doesn't work either. Might there be a 
conflict with __declspec?

Thanks,
Matt

Re: Problems with simple Apache module dll

#624

Author: Michel Leunen
Date: Tue, 23 May 2006 18:31

17 lines
1657 bytes

Matt Lowe wrote:

> hello_module isn't a function, it's a struct. 

Hopefully someone with a better knowledge of this issue will answer you. 
What I know is that exporting classes and therefore struct is compiler 
specific. That means that your dll with exported classes will not work 
when used with an application build with a different compiler.

Michel
-- 
----------------------------------------
Michel Leunen
mailto: see my homepage.
C++Builder, BCC5.5.1 Web site:
http://www.leunen.com/
----------------------------------------

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