Thread: Python Shell Call does not work:

Hey,

Code:

    ...
    fprintf(python_file_pointer, "print(list)\n");
    system("python3 translation.py");
    fclose(python_file_pointer);
    fclose(fp);

This pythoncode unfortunately does not get executed or the process is not started at all.

Why?

Thanks

Originally Posted by laserlight

Post the smallest and simplest compilable C program that demonstrates the problem, along with the test Python program.

Actually, looking at the first fprintf call I'm guessing that you're writing the Python program from the C program, in which case you should fclose before calling system. But it's only a guess because you chose to post a code snippet without enough context.

Code:

int main(int argc, const char * argv[]) {
    if(argc <= 2)return -1;
    
    char file_name[100];
    strncpy(file_name, argv[1], 100);
    FILE* fp = fopen(file_name, "read");
    if(!fp)return -1;
    
    //some irrelevant code


    remove("translation.py");
    FILE * python_file_pointer = fopen("translation.py", "ab+");
    fprintf(python_file_pointer, "list = []\n");
    
    //Do parsing and magic here, which does not matter
    
    fprintf(python_file_pointer, "print(list)\n");
    system("python3 translation.py");
    fclose(python_file_pointer);
    fclose(fp);
    
}

Problem solved! I have to close first! Thank you!