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<P DIR=LTR><SPAN LANG="en-gb"><FONT SIZE=2>Sorry if this is a bit simple but any help welcome.</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-gb"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-gb"><FONT SIZE=2>I am adding some C++ code to Python. From Python I want to be able to read</FONT></SPAN><SPAN LANG="en-gb"><FONT SIZE=2></FONT></SPAN><SPAN LANG="en-gb"> <FONT SIZE=2>data from a target device, over USB. My software does all the hard work and I have a class:<BR>
</FONT></SPAN><SPAN LANG="en-gb"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-gb"><FONT SIZE=2>typedef unsigned</FONT></SPAN><SPAN LANG="en-gb"> <FONT SIZE=2>__int8</FONT></SPAN><SPAN LANG="en-gb"> <FONT SIZE=2> u8;</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-gb"><FONT SIZE=2>typedef unsigned</FONT></SPAN><SPAN LANG="en-gb"> <FONT SIZE=2>__int16</FONT></SPAN><SPAN LANG="en-gb"><FONT SIZE=2> u</FONT></SPAN><SPAN LANG="en-gb"><FONT SIZE=2>16</FONT></SPAN><SPAN LANG="en-gb"><FONT SIZE=2>;</FONT></SPAN><SPAN LANG="en-gb"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-gb"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-gb"><FONT SIZE=2>typedef int ErrorT;</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-gb"><BR>
<FONT SIZE=2>class ViperUsbC<BR>
{<BR>
public:<BR>
// snip snip<BR>
</FONT></SPAN><SPAN LANG="en-gb"><FONT SIZE=2>ErrorT</FONT></SPAN><SPAN LANG="en-gb"><FONT SIZE=2></FONT></SPAN><SPAN LANG="en-gb"> <FONT SIZE=2>ReadSlaveMemory(u8 Slave, u16 Offset, u8* pData, u16 Length);<BR>
// Snip,snip<BR>
};<BR>
<BR>
I use swigwin-1.3.34 to wrap it into a module called SHIP.<BR>
<BR>
In Python, I have:<BR>
<BR>
import SHIP<BR>
ViperUsb = SHIP.ViperUsbC()<BR>
Slave =7<BR>
Offset = 0<BR>
Length = 64<BR>
Buffer = 'a' * Length<BR>
print "type(Buffer)=%s" % type(Buffer)<BR>
print "len(Buffer)=%s" % len(Buffer)<BR>
Result = ViperUsb.ReadSlaveMemory(Slave, Offset, Buffer, Length);<BR>
<BR>
That fails with:<BR>
<BR>
type(Buffer)=<type 'str'><BR>
len(Buffer)=64<BR>
<BR>
Traceback (most recent call last):<BR>
File "H:\Husky\HostPC\V1\SHIP\test1.py", line 1970, in -toplevel-<BR>
ViperTests()<BR>
File "H:\Husky\HostPC\V1\SHIP\test1.py", line 1884, in ViperTests<BR>
Result = ViperUsb.ReadSlaveMemory(Slave, Offset, Buffer, Length);<BR>
File "H:\Husky\HostPC\V1\SHIP\Release\SHIP.py", line 1757, in<BR>
ReadSlaveMemory<BR>
def ReadSlaveMemory(*args): return<BR>
_SHIP.ViperUsbC_ReadSlaveMemory(*args)<BR>
TypeError: in method 'ViperUsbC_ReadSlaveMemory', argument 4 of type 'u8 *'<BR>
<BR>
<BR>
How do I provide a buffer into which to read the data? It would not be intolerable to provide another layer using %extend, but I feel sure this should be automagic.<BR>
<BR>
Thanks in advance<BR>
Bill<BR>
<BR>
PS This is a very small part of a much larger project so I cannot supply complete source code.</FONT></SPAN><SPAN LANG="en-gb"></SPAN></P>
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<P DIR=LTR><SPAN LANG="en-gb"></SPAN><SPAN LANG="en-gb"></SPAN><SPAN LANG="en-gb"><FONT SIZE=1 FACE="Courier New">Bill Davy, Synectix Limited, 12 King Alfred Way, Cheltenham, GL52 6QP, England</FONT></SPAN></P>
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<P DIR=LTR><SPAN LANG="en-gb"></SPAN><SPAN LANG="en-gb"></SPAN><SPAN LANG="en-gb"><FONT SIZE=1 FACE="Courier New">Telephone: +44 (0)1242 254411, Mobile: +44 (0)7866 451568, Fax: +44 (0)1242 256611</FONT></SPAN><SPAN LANG="en-gb"></SPAN><SPAN LANG="en-gb"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-gb"></SPAN><SPAN LANG="en-gb"></SPAN><SPAN LANG="en-gb"><FONT SIZE=1 FACE="Courier New">Work: <A HREF="mailto:Bill@SynectixLtd.com">mailto:Bill@SynectixLtd.com</A></FONT></SPAN><SPAN LANG="en-gb"></SPAN><SPAN LANG="en-gb"></SPAN></P>
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