I have a ctypes module that is failing under Iron Python. The module is
hosted at http://essbasepy.googlecode.com if anyone wants to view the
source.
I have a union defined as:
class output_buffer(Union):
_fields_ = [('pdVal', c_double * MAX_REC),
('pbVal', c_ubyte * MAX_REC),
('pszVal', col_t * MAX_REC)]
When attempting to use the pbVal field as follows:
elif pDescr.IntTyp == MAXL_DTINT_BOOL:
pInBuff = pBuffer.pbVal
Type = MAXL_DTEXT_UCHAR
Size = 0
...
sts = maxl.MaxLColumnDefine(sid, c_ulong(index + 1), pInBuff,
c_ushort(Size), c_ulong(Type), c_ushort(MAX_REC), None, None)
the called c module fails with the following exception:
clsException in System.Collections.ListDictionaryInternal
e {*expected c_char_Array_1025_Array_1, got c_ubyte_Array_1*} object
{IronPython.Runtime.Exceptions.PythonExceptions.BaseException}
Data {System.Collections.ListDictionaryInternal}
System.Collections.IDictionary
{System.Collections.ListDictionaryInternal}
Message "expected c_char_Array_1025_Array_1, got c_ubyte_Array_1" string
Source "IronPython.Modules" string
StackTrace " at IronPython.Modules.ModuleOps.CheckCDataType(Object
o, Object type)\r\n at InteropInvoker(IntPtr , Object , Object ,
Object , Object , Object , Object , Object , Object , Object[] )\r\n
at CallSite.Target(Closure , CallSite , Object , Object , Object ,
Object , Object , Object , Object , Object , Object )\r\n at
Microsoft.Scripting.Interpreter.DynamicInstruction`10.Run(InterpretedFrame
frame)\r\n at
Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame
frame)\r\n at
Microsoft.Scripting.Interpreter.LightLambda.Run11[T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,TRet](T0
arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7,
T8 arg8, T9 arg9, T10 arg10)\r\n at
Essbase$2._MaxlOutputNextRecord$70(PythonFunction $function, Object
self, Object sid, Object ssnInit, Object numFlds) in C:\\Program
Files\\IronPython 2.7\\lib\\site-packages\\Essbase.py:line 376" string
TargetSite {CData CheckCDataType(System.Object,
System.Object)} System.Reflection.MethodBase
{System.Reflection.RuntimeMethodInfo}
I am a little out of my depth here, so hoping someone understands
ctypes in general and the Iron Python implementation in particular.
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