You can load the file containing PTX code in your own code from the filesystem by cuModuleLoad
and cuModuleGetFunction
as follows:
CUmodule module;
CUfunction function;
const char* module_file = "my_ptx_file.ptx";
const char* kernel_name = "my_kernel_name";
err = cuModuleLoad(&module, module_file);
err = cuModuleGetFunction(&function, module, kernel_name);
You can also pass the PTX code to the CUDA driver directly as a string, see Passing the PTX program to the CUDA driver directly.