OpenEuphoria

1. Passing a pointer of function to a c function

• Posted by David Ryder <ryder7 at btinternet.com> Apr 02, 2007
• 521 views

Please could anyone help me to use this c function thanks.

SWHANDLE SWModule_doSearch(SWHANDLE hmodule, const char *searchString, int type,
int params ,void (*percent) (char, void *), void *percentUserData)

it's the bit that points to a function that I am not sure how to get it to work
in Euphoria: void (*percent) (char, void *)

this is the euphoria that imports this function.

SWModSearch = define_c_func(swordLib, "SWModule_doSearch", {C_POINTER, C_CHAR,
C_INT, C_INT, C_POINTER, C_POINTER}, C_POINTER)
global function EuSWModSearch(atom mod, sequence searchString, atom searchType,
atom params ,atom percent, atom percentUserData)
atom listPtr, searchStringPtr, percentPtr, percentUserDataPtr
sequence listKey, element

searchStringPtr = allocate_string(searchString)

percentPtr = allocate(4)
percentUserDataPtr = allocate(4)

listPtr = c_func(SWModSearch,{mod, searchStringPtr, searchType, params,
percentPtr, percentUserDataPtr})

if listPtr != NULL then

  element = getListKeyVal(listPtr)

  while element != NULL do

	listKey = append(listKey, element)
	listKeyNext(listPtr)
	element = getListKeyVal(listPtr)
  end while

end if


return listKey

end function


Thanks for your help

David

3. Re: Passing a pointer of function to a c function

• Posted by David Ryder <ryder7 at btinternet.com> Apr 02, 2007
• 489 views
• Last edited Apr 03, 2007

thanks Matt

What I would really like to do would be to figure out how to wrap the original
C++ code for this library

However, the developers provide a c wrapper which I am using at the moment.

I have looked at the wxEuphoria library and the numerous posts on this forum,
but decided that it will have to wait till i have more time

I have got the function to work, using call_back as you suggested.

David