Perhaps using "long" to represent the string could work or using long* with the following hard coded manner to pass the string.. bytes := 'adsadsasdd' asByteArray. ea := ( ExternalAddress allocate: bytes size) . 1 to: bytes size do: [ :e | ( ea byteAt: e put: ( bytes at: e ) ]. out := ea asInteger. will try it out and let you know further.. but I guess it should work... null terminate if that is desired.. On Sun, Apr 29, 2012 at 1:26 AM, <recursive68@gmail.com> wrote:
Hi,
I'm trying to pass a smalltalk string to a FFI wrapper method I've written, the C function uses a macro "type" for the argument, but as far as I can see is basically a char* type. I've tried using char* as the argument type and it fails values to pass the string argument.
If I change the argument type to a void* it works sort of partially, it passes additional memory values if I pass more than one argument to a version of the function with multiple arguments. As I understand it FFI should handle strings and coerce them to null terminated char* values when char* is used as the argument type. Is there something I'm missing, not understanding (very possible).
I had similar problems when passing integer values but fixed that by using WordArray for the smalltalk type. Is there a similar fix for string objects, or someway other way of null terminating the string ?
Thanks