Hi Yuriy,

Hope I can help.�� I tried your example in build 60463 and its works fine.�� So lets break it down.

On Wed, Apr 19, 2017 at 8:46 PM, Yuriy Babah <babah.yuriy06@gmail.com> wrote:

Hello everyone,

I'm new to Pharo and have tried do example with structure in Unified FFI manual.

FFIExternalStructure subclass: #MyStructure
instanceVariableNames: ''
classVariableNames: ''
package: 'FFIDemo'

You opened a System Browser and entered and accepted the above first on its own,��

such that the new package & class were added and the new class selected.

Then you clicked on the <Class> button, such that the "no messages" text in the third pane changed from��

normal font to bold font.�� Then clicked on "no messages" to display the method template....

�� messageSelectorAndArgumentNames

"comment stating purpose of message"

�� | temporary variable names |

�� statements

��

And replaced that text with the text below from "fieldsDesc" onwards,��

the Accepted that.

MyStructure class>>#fieldsDesc
^ #(
uint8 id;
char * struct_name;
uint name_length;
)

Then separately you evaluated(doIt) the following...

��

MyStructure rebuildFieldAccessors

��

. -> DoIt -> MessageNotUnderstood

What's i do wrong?

Does a debug window appear?�� What is the exact text of the title bar,��

which details which message is not understood by which class.

This provides an important hint to what is wrong.

Further help might need a live chat. I'll be in discord for a couple of hours, but ask anyone there...

https://discord.gg/KCKQSSt

��cheers -ben

I do it in
Pharo5 and 6, widows and os x.
Sorry for my english, it's not my native language.

Your english is not too bad :) ��

cheers -ben��