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digitalmars.D.learn - how call a c function with stdcall?

reply "mzfhhhh" <mzfhhhh foxmail.com> writes:
for example:use vc compile on x86
func.c:
__declspec(dllexport) int _stdcall sub(int a,int b)
{
	return a-b;
}

func.def:

LIBRARY
EXPORTS
sub

-----------------
i use "implib.exe" to create a omf format lib.
----------------
D code:
import std.exception;

//this is a cdecl call
extern(C) int sub(int a,int b);

void main()
{
     auto c1 = sub(2,1);

     //when this line run,the c1 value is broken
     auto c2 = enforceEx!Exception(sub(1,2));
}
------------------
my question is how write D code to call the c function
Mar 24 2015
parent reply "Adam D. Ruppe" <destructionator gmail.com> writes:
try extern(Windows) isntead of extern(C).
Mar 24 2015
parent reply "mzfhhhh" <mzfhhhh foxmail.com> writes:
On Tuesday, 24 March 2015 at 15:26:22 UTC, Adam D. Ruppe wrote:

 try extern(Windows) isntead of extern(C).


use extern(Windows) or extern(System)

the compile show the link error:
Error 42: Symbol Undefined _sub 8

----------------
dll export func name is "sub",
and the dll is 3rd party,i can't change the dll code.

i use "implib.exe /system func.lib func.dll" to create a func.lib.

how can i link correctly?
Mar 24 2015
parent reply "Adam D. Ruppe" <destructionator gmail.com> writes:
On Wednesday, 25 March 2015 at 00:09:33 UTC, mzfhhhh wrote:

 i use "implib.exe /system func.lib func.dll" to create a 
 func.lib.


You might also need to specify the .def file as the final 
argument to that.

http://digitalmars.com/ctg/implib.html

The def file can list aliases for the functions. Maybe try it 
without the /system flag too. I know there's a way but I don't 
know exactly what, I just tend to guess and check a little...
Mar 24 2015
parent "mzfhhhh" <mzfhhhh foxmail.com> writes:
On Wednesday, 25 March 2015 at 00:26:21 UTC, Adam D. Ruppe wrote:

 On Wednesday, 25 March 2015 at 00:09:33 UTC, mzfhhhh wrote:

 i use "implib.exe /system func.lib func.dll" to create a 
 func.lib.


 You might also need to specify the .def file as the final 
 argument to that.

 http://digitalmars.com/ctg/implib.html

 The def file can list aliases for the functions. Maybe try it 
 without the /system flag too. I know there's a way but I don't 
 know exactly what, I just tend to guess and check a little...


1.def file:
   LIBRARY "func"

   EXPORTS
   _sub 8 = sub

2.create lib
   implib.exe func.lib func.def

-------------------------
now it works fine,thanks!
Mar 24 2015