hi, it all depends on how you are declaring your types.
here, for example you are passing aTF_OutputArray getHandle that’s a “void*” value (an ExternalAddress or ExternalData object), and in declaration you have (if I read correctly): TF_Output * so, first question is: if TF_Output != void, then you have a coercing problem :). you can fix that just changing the notation to receive a void * (in C is all the same, but not in pharo :)) note that this can be happening in a lot of places, since your function has a lot of arguments, I just put an example of what can be wrong. cheers, Esteban > On 27 Apr 2018, at 11:23, Serge Stinckwich <serge.stinckw...@gmail.com> wrote: > > I would like to pass a pointer to an array of pointers to a FFI call and I > have problems ... > > I have this method: > > runOutputs: aTF_OutputArray size: anInteger > | status outvalues | > status := TF_Status create. > outvalues := FFIExternalArray externalNewType: 'TF_Tensor*' size: > anInteger. > self library > runSession: self > options: FFIExternalObject null > inputs: FFIExternalObject null > values: FFIExternalObject null > count: 0 > outputs: aTF_OutputArray getHandle > values: outvalues getHandle > count: anInteger > targets: FFIExternalObject null > count: 0 > metadata: FFIExternalObject null > status: status. > status check. > ^ outvalues > > the FFI call is like that : > > runSession: aTF_Session > options: opsTF_Buffer > inputs: inTF_OutputArray values: inTF_TensorArray count: inCount > outputs: outTF_OutputArray values: outTF_TensorArrayPtr count: outCount > targets: aTF_OperationArray count: targetCount > metadata: metaTF_Buffer > status: aTF_Status > > "F_CAPI_EXPORT extern void TF_SessionRun( > TF_Session* session, > // RunOptions > const TF_Buffer* run_options, > // Input tensors > const TF_Output* inputs, TF_Tensor* const* input_values, int ninputs, > // Output tensors > const TF_Output* outputs, TF_Tensor** output_values, int noutputs, > // Target operations > const TF_Operation* const* target_opers, int ntargets, > // RunMetadata > TF_Buffer* run_metadata, > // Output status > TF_Status*);" > > ^ self > ffiCall: #(void TF_SessionRun #(TF_Session * aTF_Session, TF_Buffer * > opsTF_Buffer, TF_Output * inTF_OutputArray, TF_Tensor * inTF_TensorArray, int > inCount, TF_Output * outTF_OutputArray, TF_Tensor * outTF_TensorArrayPtr, int > outCount, TF_Operation * aTF_OperationArray, int targetCount, TF_Buffer * > metaTF_Buffer, TF_Status * aTF_Status)) > module: TensorFlowCAPI > > TF_Tensor is an opaque object. > > I have an error: "Could not coerce arguments". > I guess this is related to the way I pass arguments to the FFI function ? > > -- > Serge Stinckwich > UMI UMMISCO 209 (SU/IRD/UY1) > "Programs must be written for people to read, and only incidentally for > machines to execute." > http://www.doesnotunderstand.org/ <http://www.doesnotunderstand.org/>
