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Questions tagged [c-api]

154 questions
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Call C API with vector of strings from C++

In my C++ application, I use an external library that exposes a C API. Some of the C functions take arrays of strings as input and use char** for that: void c_api_function(char** symbols, int count); (Note: I think a pointer to const would be more…
pschill
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Python Method Call in a C++ Code through Python C-API

I am working on my Project which implies the use of Empirical Mode Decomposition in C++ for EEG Signals. The input Data is Eigen::MatrixXd, where the rows are the Channels and the columns are the samples. I did not found a good C++ library for EMD…
Youssef Zarca
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In Lua, access the evaluated value of a C function addressed via a userdata table

I have a piece of lua code that is called from a C program that passes it a table. The table contains a table which has a field that LUA reports is of type "function". I want to invoke that function and get its return value, but the following just…
LucyLa
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Tensorflow c_api (1.13.2) - Import LSTM .pb: Expected input[1] to be a control input

I'm currently working on importing a trained (python3.8, TF==2.3) LSTM-Model by using the C-API (TF==1.13.2). I have to stick with this software versions. I try to show my steps so far using a dummy-example. My model description (for dummy import…
Dandyman
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How can I confine TensorFlow C API to use one and only one thread in total

I'm using TensorFlow C API in C++ on linux to load a face detection model for inference. TensorFlow generates multiple threads and I want to restrict or confine the process to use one and only one thread. How can I confine TensorFlow C API to…
fisakhan
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Is there a way to supress TensorFlow logging in C-API

I managed to run my SavedModel generated by Python using C-API. Now I want to suppress all the verbose from TensorFlow as below: 2020-07-17 13:44:45.358903: I tensorflow/cc/saved_model/reader.cc:31] Reading SavedModel from:…
philgun
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C-API from Python - How can I get a string?

Euler Math Toolbox (www.euler-math-toolbox.de) has an interface with Python 2. Now it should interface with Python 3. But I seem to be unable to read output from Python. Below is a simple example of what I am trying to do. The code fails in the last…
Rene
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Segmentation fault creating PyArrayObject using PyArray_SimpleNew

I am creating a C extension for numpy. The function should return an array, so I decided to create a PyArrayObject with dimensions 50x10 using PyArray_SimpleNew and later fill it with some values. Here is the code: PyArrayObject *a; npy_intp…
German Farinas
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Meta-language to describe types in a language-independent way for a "C-API"

Is there a meta-language to describe types (structures/records, function types and their parameters ...) and constants that can be fed to a tool or that I can then write code for to create prototypes for multiple target languages? Note: (E)BNF is…
0xC0000022L
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SQLite C API equivalent to typeof(col)

I want to detect column data types of any SELECT query in SQLite. In the C API, there is const char *sqlite3_column_decltype(sqlite3_stmt*,int) for this purpose. But that only works for columns in a real table. Expressions, such as LOWER('ABC'), or…
Anse
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Tensorflow v2.0.0 c-api crashes when loading "saved_model" format Keras model

Tensorflow v2.0.0 segfaults when trying to load a model using the C_API. The Keras model is absurdly simple: model = tf.keras.models.Sequential() model.add(tf.keras.layers.Dense(512, activation='relu',…
Zendel
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How to retrieve data from a returned numpy array in a C program?

I have a main program written in C and would like to use an already written library in Python, so I embedded some C-Python API into my C program. I have successfully created a PyObject that represents a numpy array, containing float data in C, and…
bigchaipat
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SQLite/AutoHotkey, I have problem with Encoding of sqlite3_result_text return function

I am writing a User Define Function with SQLite in AutoHotkey. It works well as I intended when I use (return) English only. But, If I use (return) any character with NonEnglish, it makes broken result. The broken result has, for me, some rules -…
Kita Nagoya
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Lua version at runtime

I am trying to make a fat runtime library (in C) for lua using ifunc attribute, to do so i need the lua version from the C api at runtime for my resolver function. I know there are the _VERSION stored somewhere in the global table but i can't rely…
nepta
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How to disable warnings in tensorflow written to output when using the c api of tensorflow

I use TensorFlow 1.13.1 by integrating it using the C-API (my program is in C++). Tensor flow writes a warning to the std output, and I want to suppress this warning as I a need the std output and std error under my control, not wanting tensorflow…
Hikaru
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