How do you link MS Visual Studio C/C++ with Fasm ?

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shism2

Joined: 14 Sep 2005
Posts: 248

shism2 17 Nov 2006, 12:24

Can anyone provide any example or way to actually do this ? I need a way urgently... because I need to work on a paid project with a company ... thanks Smile

17 Nov 2006, 12:24

Raedwulf

Joined: 13 Jul 2005
Posts: 375
Location: United Kingdom

Raedwulf 17 Nov 2006, 12:36

Well, what sort of source code are you using... C or C++.
Have you got a FASM source file? You will need to assemble FASM src as MSCOFF object format...

More details please so we can give you more specific answers.

17 Nov 2006, 12:36

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 17 Nov 2006, 16:37

in FASM, create MS COFF file. there, declare your procedure as public:

Code:

proc string, size
...
endp
public myproc as '_myproc'

in C, declare it:

Code:

extern "C" {
myproc(char*, int);
}

and link it with OBJ file created from FASM source. In visual studio, it's (i think):

project context menu (right click on project) -> properties -> Link -> additional dependencies

17 Nov 2006, 16:37

Maverick

Joined: 07 Aug 2006
Posts: 251
Location: Citizen of the Universe

Maverick 17 Nov 2006, 17:07

By the way, does somebody happen to have some good docs about the MSCOFF object format produced and used by VisualC 8.0?

17 Nov 2006, 17:07

wisepenguin

Joined: 30 Mar 2005
Posts: 129

wisepenguin 17 Nov 2006, 19:54

i had a topic on the board a while ago about using FASM within
the 2005 IDE, and actually compile the fasm source code within
msvc2005 with asm syntax colouring.

i will try and find it for you, or search for "fasm 2005 ide" or similar
on the board

17 Nov 2006, 19:54

wisepenguin

Joined: 30 Mar 2005
Posts: 129

wisepenguin 17 Nov 2006, 19:58

here you go

http://board.flatassembler.net/topic.php?t=4986

17 Nov 2006, 19:58

Quantum

Joined: 24 Jun 2005
Posts: 122

Quantum 18 Nov 2006, 14:47

vid

Quote:

extern "C"

That works in C++ only. In plain C you have to use just extern (not required in most cases, because all unknown functions are assumed to be extern by default). So, to make it compatible with both C and C++, some preprocessing is required:

Code:

#ifdef __cplusplus
        extern "C" {
#endif
int myproc(void); 
#ifdef __cplusplus
        }
#endif

Maverick
http://www.microsoft.com/whdc/system/platform/firmware/PECOFF.mspx

Last edited by Quantum on 20 Nov 2006, 01:27; edited 1 time in total

18 Nov 2006, 14:47

Maverick

Joined: 07 Aug 2006
Posts: 251
Location: Citizen of the Universe

Maverick 18 Nov 2006, 16:01

Quantum wrote:

Maverick
http://www.microsoft.com/whdc/system/platform/firmware/PECOFF.mspx

Thanks a lot, Quantum Smile

And many thanks also to sleepsleep who emailed the files this morning. Smile

_________________
Greets,
Fabio

18 Nov 2006, 16:01

shism2

Joined: 14 Sep 2005
Posts: 248

shism2 19 Nov 2006, 19:18

So,Quantum... that works without any modification to it?

19 Nov 2006, 19:18

Quantum

Joined: 24 Jun 2005
Posts: 122

Quantum 20 Nov 2006, 01:26

In FASM:

Code:

public myproc as '_myproc'
myproc:
mov eax,5
ret

In C:
+ the example above

Code:

printf("%d", myproc());

Prints out: 5

20 Nov 2006, 01:26

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