On Saturday, 29 March 2014 at 15:03:18 UTC, BeschBesch wrote:
I want to use a set of functions that rely on a library which
is not available for D (Harfbuzz). So I just wrote myself a set
a functions that will do anything I need (Init, Free, Fonts,
Text, etc).
The DLL is working fine and dynamically linking should work (it
does in C++ --> LoadLibrary). Unfortunately, i get Error 42
evertime i try to call a function.
As i suspected that some things written by me could be
responsible for this, I build a test application with three
functions (Test, Test2,Test3), got myself the D-.lib for
statical-linking (implib-Dmd) and tried that one out. The
result: Error 42.
What did I miss that can still cause linker errors? So far I
did:
DLL is written in C (C89 --> VC++ only can afford that one it
seems). And yes I changed it to C from C++ in the compiler
settings.
DLL has an entry function AND a module-definition file (.def).
A .lib-file is created alongside with the DLL (.def specified
in porject settings). OF COURSE, I built a D-conform .lib by
using implib with /s option (and without) /s option.
Thank you, if you are still reading.
CODE:
////// declared in Test.h
void Test1(void);
int Test2(int i);
long Test3(int* ptr);
////// Example implementation in Test.c (include "test.h"
void Test1(void)
{
printf("FUNCTION WAS CALLED\n");
}
///// .def-File
LIBRARY "CtoDtestDll"
EXPORTS
Test1 @1
Test2 @2
Test3 @3
/// SETTINGS (C++)
Calling-convention: __cdecl (= std. ??)
Compiling for: C (/TC)
/// SETTINGS (LINKER)
Modul-definition-file: CTestDll.def....
////// D-Module for usage with .lib from .dll (implib! from bup)
module CoreFuncs; // just a name
pragma (lib,"CtoDtestDll.lib"); // statically linking (could
user settings too)
extern (C) /// needed so the compiler can link the functions
{
void Test();
}
have you looked at exported symbols in dll? it may be C++ from
what you said(lib not designed for C++?), so you can try
extern(C++) on D side instead extern(C). or add manually #ifdef
__cplusplus and extern "C" on lib side(if its not that big of
course).
