Making a DLL out of a PhAB application ?

[fredd]

Hi all

so far i got always the same problem when i try to use the DLL in a C application. When it reach the line

if ((handle = dlopen("/fred/libresource.so", RTLD_NOW)) == NULL)
{
perror(“dlopen”);
printf(“dlerror: %sn”, dlerror());
exit(1);
}

i got a segmentation fault.

so far, i’ve tryed add these line in either makefile or common.mk

CFLAGS+=-shared
LDFLAGS+=-shared -Wl,-Bsymbolic
SDFLAGS+=-shared -Wl,-Bsymbolic

the compilation is successful and i see a puzzle piece picture as icon before the name of my executable release.

in my library i use
ApAddContext(&AbContext,"/fred/libresource.so");

when i rename my library file (libresource.c) in a .dll, i got a valid pointer from the function dlopen. Is there something missing for the linker or in my library ?

any help would be appreciate.

Fred

[fredd]

The Solution is :

make the correction that i have mentionned in the thread Setting up Linker’s Option…
after that :

check export all symbols in the linker’s options. Select the type of library (probably shared .so & .a)

In the DLL you have to write an Initialisation function :

int InitDLL(int argc, char* argv[]){
ApAddContext(&AbContext,“Path to the library”);
…
}

and a Cleanup function :

int CleanDLL(int argc, char *argv[]){
ApRemoveContext(&AbContext);
…
}

in the application :

void library_handle;
typedef int (dllfunc)(int, char);
dllfunc InitDll, CleanDll;

if((library_handle = dlopen(“Path to the library”,RTLD_NOW)) == NULL){
…
exit(1);
}

if((InitDll = dlsym(library_handle,“InitDll”)) == NULL){
…
exit(1);
}

(*InitDll)(argc,argv);

use your functions…

then cleanup

if ((CleanDll = dlsym(library_handle,“CleanDll”)) == NULL){
…
exit(1);
}

(*CleanDll)(argc,argv);

dlclose(library_handle);

Fred