pdf to text python

#include <Python.h>

int main() {
    PyObject pModule, pFunc, pArgs, pValue;

    // Initialize the Python interpreter
    Py_Initialize();

    // Import the necessary module
    pModule = PyImport_ImportModule("pdf2txt");

    // Check if the module has been imported successfully
    if (pModule != NULL) {
        // Get the function from the module
        pFunc = PyObject_GetAttrString(pModule, "convert_pdf_to_string");

        // Check if the function is callable
        if (pFunc && PyCallable_Check(pFunc)) {
            // Prepare the arguments to be passed to the function
            pArgs = PyTuple_New(1);
            PyTuple_SetItem(pArgs, 0, Py_BuildValue("s", "your_pdf_file.pdf"));

            // Call the function with the arguments
            pValue = PyObject_CallObject(pFunc, pArgs);

            // Check if the function call was successful
            if (pValue != NULL) {
                // Convert the result to a C string
                char *result;
                PyArg_Parse(pValue, "s", &result);

                // Use the result (in this case, printing it)
                printf("Text extracted from PDF: %s\n", result);

                // Free the C string
                PyMem_Free(result);
            } else {
                // Handle the case where the function call failed
                PyErr_Print();
            }
        } else {
            // Handle the case where the function is not callable
            if (PyErr_Occurred())
                PyErr_Print();
            fprintf(stderr, "Cannot find function 'convert_pdf_to_string'\n");
        }

        // Release references and clean up
        Py_XDECREF(pFunc);
        Py_DECREF(pModule);
    } else {
        // Handle the case where the module couldn't be imported
        PyErr_Print();
        fprintf(stderr, "Failed to load 'pdf2txt' module\n");
        return 1;
    }

    // Finalize the Python interpreter
    Py_Finalize();

    return 0;
}

Explanation:

• #include <Python.h>: Includes the necessary header file to interact with Python from C++.

• PyObject pModule, pFunc, pArgs, pValue;: Declares pointers for Python objects that will be used to interact with Python.

• Py_Initialize();: Initializes the Python interpreter in the C++ program.

• pModule = PyImport_ImportModule("pdf2txt");: Imports the pdf2txt Python module that is supposed to contain the function to convert PDF to text.

• if (pModule != NULL) { ... }: Checks if the module was imported successfully.

• pFunc = PyObject_GetAttrString(pModule, "convert_pdf_to_string");: Retrieves the function convert_pdf_to_string from the imported Python module.

• if (pFunc && PyCallable_Check(pFunc)) { ... }: Checks if the function is callable.

• pArgs = PyTuple_New(1); PyTuple_SetItem(pArgs, 0, Py_BuildValue("s", "your_pdf_file.pdf"));: Prepares arguments to be passed to the Python function. In this case, it prepares a string argument with the filename of the PDF file to be converted.

• pValue = PyObject_CallObject(pFunc, pArgs);: Calls the Python function with the provided arguments.

• if (pValue != NULL) { ... }: Checks if the function call was successful.

• PyArg_Parse(pValue, "s", &result);: Parses the returned Python object into a C string.

• printf("Text extracted from PDF: %s\n", result);: Prints the extracted text from the PDF.

• PyMem_Free(result);: Frees the allocated C string memory.

• Py_XDECREF(pFunc); Py_DECREF(pModule);: Releases references to the Python objects and cleans up memory.

• Py_Finalize();: Finalizes the Python interpreter in the C++ program before exiting.

This C++ code snippet demonstrates how to call a Python function (convert_pdf_to_string from pdf2txt module) to extract text from a PDF file within a C++ program using the Python/C API.