gflConvolve

[madiazg]

Hi,
I have problems with the function gflConvolve. In Delphi:

Code: Select all

var
    Filtro : PGFL_Filter;
....
begin
....
  Filtro.Size := 3; //-> ERROR
...
end;

Error in the application when I define the width of the matrix.
What is the problem?

Regards...
Miguel Angel

[xnview]

What is the error?

[madiazg]

What is the error?

The error occurs when running the application:

"Access violation at address FEFCC481. Read of address FEFCC481"

Miguel Angel

[xnview]

It's not TGFL_FILTER that you must use??

[madiazg]

It's not TGFL_FILTER that you must use??

I'm sorry but i don't understand you

Miguel Angel

[xnview]

TGFL_FILTER is a pointer, no? Not the struct?

[madiazg]

TGFL_FILTER is a pointer, no? Not the struct?

yes, PGFL_FILTER is a pointer to the structure TGFL_FILTER. In libgfl.pas:

Code: Select all

PGFL_FILTER = ^TGFL_FILTER;
  TGFL_FILTER = record
    Size: GFL_INT16;
    Matrix: array[0..15, 0..7] of GFL_INT16;
    Divisor: GFL_INT16;
    Bias: GFL_INT16;
  end;
function gflConvolve(src: PGFL_BITMAP; dst: PPGFL_BITMAP;  var filter: PGFL_FILTER): GFL_ERROR; stdcall;

Regards...
Miguel Angel

[xnview]

Ok, but i don't understand why with

Code: Select all

Filtro.Size := 3;

you have a crash...

[Mike]

Hi,
Filtro is pointer. It must be defined. I.e. must point to a chunk of memory where located structure GFL_FILTER. Please use getmem() or similar function. After that, it can be used in parts of your sample. Or use TGFL_FILTER