1. DLL trouble
- Posted by No Solution <solutionnone at HOTMAIL.COM>
Oct 22, 2000
-
Last edited Oct 23, 2000
This time i'm losing my mind trying to compile my DLL that i'm writing in C
so that i can use the functions in it in Euphoria
Any help would be greatly appreciated
Ian.
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2. Re: DLL trouble
- Posted by No Solution <solutionnone at HOTMAIL.COM>
Oct 22, 2000
-
Last edited Oct 23, 2000
>From: No Solution <solutionnone at HOTMAIL.COM>
>Reply-To: Euphoria Programming for MS-DOS <EUPHORIA at LISTSERV.MUOHIO.EDU>
>To: EUPHORIA at LISTSERV.MUOHIO.EDU
>Subject: DLL trouble
>Date: Sun, 22 Oct 2000 20:03:11 PDT
>
>This time i'm losing my mind trying to compile my DLL that i'm writing in C
>so that i can use the functions in it in Euphoria
>
>Any help would be greatly appreciated
>
>Ian.
never mind everbody! i fixed my problem!
if you want to see how i fixed my problem email me and i'll show you!
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3. Re: DLL trouble
No Solution wrote:
> This time i'm losing my mind trying to compile my
> DLL that i'm writing in C so that i can use the
> functions in it in Euphoria
Just thought I'd mention - I've posted a version of SWIG that is capable of
generating wrappers for some C libraries automatically, making it less
painful to interface Euphoria to DLLs.
-- David Cuny
4. Re: DLL trouble
>This time i'm losing my mind trying to compile my
>DLL that i'm writing in C so that i can use the
>functions in it in Euphoria
>
You'll need this:
BOOL WINAPI LibMain(HINSTANCE hDLLInst, DWORD fdwReason, LPVOID lpvReserved)
{
switch (fdwReason)
{
case DLL_PROCESS_ATTACH:
return TRUE;
break;
case DLL_PROCESS_DETACH:
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
}
return TRUE;
}
plus, you usually need to supply a definition-file (*.def). This file should
look like this:
EXPORTS
func_1
func_2
...
func_n
(where func_1..n are the functions you wish to make linkable).
You include this file on the commandline when you link your program.
You may also have to declare those functions as _dllexport (or something
like that). it's not needed with msvc though.
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5. DLL trouble
- Posted by K. Einfeldt <keinfeldt at ?yrealbox.co?>
Dec 02, 2007
-
Last edited Dec 03, 2007
I'm accessing DLL's with the open_dll function, e.g.}}}
<eucode>
include dll.e
constant kernel32 = open_dll("kernel32.dll"),
cSetEndOfFile = define_c_func(kernel32, "SetEndOfFile", {C_UINT}, C_UINT)
</eucode>
{{{
but what do I do if I need to use a function that takes parameters other than
the ones built-in, namely: }}}
<eucode>
global constant
C_CHAR = #01000001,
C_UCHAR = #02000001,
C_SHORT = #01000002,
C_USHORT = #02000002,
C_INT = #01000004,
C_UINT = #02000004,
C_LONG = C_INT,
C_ULONG = C_UINT,
C_POINTER = C_ULONG,
C_FLOAT = #03000004,
C_DOUBLE = #03000008
</eucode>
{{{
Many functions take more advanced "struct" arguments. What do I use in that
case?
If there's no way around this limitation, does anyone know a better way "into"
DLL's than the open_dll function? I'm also a little frustrated in that I can't
access global constants defined in the DLL.
Thanks in advance for any help!
6. Re: DLL trouble
- Posted by Bernie Ryan <xotron at bl?efrog.c?m>
Dec 02, 2007
-
Last edited Dec 03, 2007
K. Einfeldt wrote:
>
> I'm accessing DLL's with the open_dll function, e.g.}}}
<eucode>
> include dll.e
> constant kernel32 = open_dll("kernel32.dll"),
> cSetEndOfFile = define_c_func(kernel32, "SetEndOfFile", {C_UINT}, C_UINT)
> </eucode>
{{{
> but what do I do if I need to use a function that takes parameters other than
> the ones built-in, namely: }}}
<eucode>
> global constant
> C_CHAR = #01000001,
> C_UCHAR = #02000001,
> C_SHORT = #01000002,
> C_USHORT = #02000002,
> C_INT = #01000004,
> C_UINT = #02000004,
> C_LONG = C_INT,
> C_ULONG = C_UINT,
> C_POINTER = C_ULONG,
> C_FLOAT = #03000004,
> C_DOUBLE = #03000008
> </eucode>
{{{
> Many functions take more advanced "struct" arguments. What do I use in that
> case?
>
> If there's no way around this limitation, does anyone know a better way "into"
> DLL's than the open_dll function? I'm also a little frustrated in that I
> can't
> access global constants defined in the DLL.
>
> Thanks in advance for any help!
You have to allocate memory for any structure size that you wish to
use.
Then you have to poke the values into the appropriate location
in your memory structure.
Then when you call your function you pass the memory address of
that structure.
You can look at any of the window libraries in the archive to see
how they create their structures.
It would probably be easier for you to use the one of window libraries that
are already created.
Bernie
My files in archive:
WMOTOR, XMOTOR, W32ENGIN, MIXEDLIB, EU_ENGIN, WIN32ERU, WIN32API
Can be downloaded here:
http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on&keywords=bernie+ryan
7. Re: DLL trouble
- Posted by Derek Parnell <ddparnell at bigp?n?.com>
Dec 02, 2007
-
Last edited Dec 03, 2007
K. Einfeldt wrote:
>
> I'm accessing DLL's with the open_dll function ...
> but what do I do if I need to use a function that
> takes parameters other than the ones built-in ...
> Many functions take more advanced "struct" arguments...
There are very, very few DLL calls that need a struct. Usually they take a
pointer to a struct, which Euphoria can handle with a C_POINTER.
Can you give an example so we can work out an alternative?
> I'm also a little frustrated in that I can't
> access global constants defined in the DLL.
Does the define_c_var routine not work for you?
--
Derek Parnell
Melbourne, Australia
Skype name: derek.j.parnell
8. Re: DLL trouble
K. Einfeldt wrote:
>
> I'm accessing DLL's with the open_dll function, e.g.}}}
<eucode>
> include dll.e
> constant kernel32 = open_dll("kernel32.dll"),
> cSetEndOfFile = define_c_func(kernel32, "SetEndOfFile", {C_UINT}, C_UINT)
> </eucode>
{{{
> but what do I do if I need to use a function that takes parameters other than
> the ones built-in, namely: }}}
<eucode>
> global constant
> C_CHAR = #01000001,
> C_UCHAR = #02000001,
> C_SHORT = #01000002,
> C_USHORT = #02000002,
> C_INT = #01000004,
> C_UINT = #02000004,
> C_LONG = C_INT,
> C_ULONG = C_UINT,
> C_POINTER = C_ULONG,
> C_FLOAT = #03000004,
> C_DOUBLE = #03000008
> </eucode>
{{{
> Many functions take more advanced "struct" arguments. What do I use in that
> case?
>
Structures are passed as pointers, so use C_POINTER for any such argument.
You may have problems if the structure is passed by value, as might be the case
for 64/128-bit integers (see a recent post). AFAIK, this is a very rare case, at
least in the Windows API. Perhaps using C_DOUBLE for 64-bit integers might work,
don't know for SSE2-defined 128-bit integers.
> If there's no way around this limitation, does anyone know a better way "into"
> DLL's than the open_dll function? I'm also a little frustrated in that I
> can't
> access global constants defined in the DLL.
>
Use }}}
<eucode>define_c_var(entry_point,var_name)</eucode>
{{{
. That will give you an
address to peek/poke at.
HTH
CChris
> Thanks in advance for any help!
