I can reproduce the problem. I have this method that works:<br><br>apiInitialize: handle backend: backend host: host port: port<br>��� &quot;long odbx_init(odbx_t**, char*, char*, char*)&quot;<br>��� &lt;cdecl: long &#39;odbx_init&#39; (ulong* char* char* char*) module: &#39;opendbx&#39;&gt;<br>
��� ^self externalCallFailed<br>��� <br>But not this one:<br><br>apiInitialize: handle backend: backend host: host port: port<br>��� &quot;long odbx_init(odbx_t**, char*, char*, char*)&quot;<br>��� &lt;cdecl: long &#39;odbx_init&#39; (ulong* char* char* char*) module: &#39;opendbx&#39;&gt;<br>
��� ^self externalCallFailed<br>��� <br>a_piInitialize: handle backend: backend host: host port: port<br>��� &quot;long odbx_init(odbx_t**, char*, char*, char*)&quot;<br>��� &lt;cdecl: long &#39;odbx_init&#39; (ulong* char* char* char* <span style="background-color: rgb(255, 0, 0);">Matching number of arguments expected -&gt;</span>) module: &#39;opendbx&#39;&gt;<br>
��� ^self externalCallFailed<br>��� <br><br>Please, open a ticket. Maybe Lukas can help us. <br><br>Cheers<br><br>Mariano<br><br><br><div class="gmail_quote">On Sat, Aug 21, 2010 at 9:47 PM, Schwab,Wilhelm K <span dir="ltr">&lt;<a href="mailto:bschwab@anest.ufl.edu">bschwab@anest.ufl.edu</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">I just had an underwhelming response to my latest adventure into FFI, specifically wrapping the Acces IO USB API. �Specifically, very few functions survived from description to actually being compiled. �AFAICT, the compiler does not like underscores in method names for external functions.<br>

<br>
I&#39;m not even sure how to describe it other than to give an example. �This works:<br>
<br>
dIOWrite8:deviceIndex byteIndex:byteIndex data:data<br>
 � � � �&quot;unsigned long DIO_Write8(unsigned long DeviceIndex, unsigned long ByteIndex, unsigned char Data)&quot;<br>
<br>
 � � � �&lt; cdecl: ulong &#39;DIO_Write8&#39; ( �ulong ulong byte ) &gt;<br>
 � � � �^self invalidCall.<br>
<br>
<br>
This should compile, but it complains about a mismatch in the number of arguments:<br>
<br>
DIO_Write8:deviceIndex byteIndex:byteIndex data:data<br>
 � � � �&quot;unsigned long DIO_Write8(unsigned long DeviceIndex, unsigned long ByteIndex, unsigned char Data)&quot;<br>
<br>
 � � � �&lt; cdecl: ulong &#39;DIO_Write8&#39; ( �ulong ulong byte ) &gt;<br>
 � � � �^self invalidCall.<br>
<br>
The less Pharo forces us to change names as given from the outside, the better off we will be. �I am using a 1.1 RC2 image, just in case this has been fixed since then?? �I really need to build a new image soon.<br>
<br>
Bill<br>
<br>
<br>
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</blockquote></div><br>