# Get a Session Context

Use of the PDF Export API requires the following steps:

1. Dynamically load the `kvpdf` shared library.
2. Obtain a handle to the `KVPDFGetInterface` function.
3. Call the `KVPDFGetInterface` function to obtain function pointers for the library methods.
4. Call the `fpInit()` function pointer to initialize KeyView.
5. Perform any necessary tasks using the Export API.
6. Call `fpShutdown()` to close down KeyView.
7. Free the `kvpdf` library.

The code you use to load the library at the start and free the library at the end depends on your operating system. See Use the kvpdf library on Windows and Use the kvpdf library on Linux

After you have obtained the function pointer for the `KVPDFGetInterface` function, you can use it to get pointers to the other functions. These include `fpInit()`, which you must use to initialize KeyView before any other call, and `fpShutdown()` which must be the last call you make, to shutdown KeyView and free its resources. See Export a File to PDF and Obtain File Format Information.

The following examples describe how to load the `kvpdf` library and obtain the `KVPDFGetInterface` function pointer (`fpGetInterface()` in the example code).

## Use the kvpdf library on Windows

In the following example, `pszPathOfkvpdfdll` is the path to the `kvpdf` dynamic library, for example `C:\MicroFocus\KeyviewExportSDK-12.3.0\WINDOWS_X86_64\bin\kvpdf.dll`.

    #include "kvpdf.h"
    #include <windows.h>
    #include <stdio.h>

    void usePDFExport(const char* const pszPathOfkvpdfdll)
    {
        HMODULE hMODULE = LoadLibraryA(pszPathOfkvpdfdll);
        if (hMODULE)
        {
            KVPDF_GET_INTERFACE fpGetInterface =
                (KVPDF_GET_INTERFACE) GetProcAddress(
                    hMODULE, "KVPDFGetInterface"
                );
            if (fpGetInterface)
            {
                KVPDFInterface sInterface = {0};
                KVStructInit(&sInterface);
                if(fpGetInterface(&sInterface))
                {
                    // Code using PDF Export
                }
            }
            FreeLibrary(hMODULE);
        }
    }

## Use the kvpdf library on Linux

In the following example, `pszPathOfkvpdfso` is the path to the `kvpdf` dynamic library, for example `/opt/MicroFocus/KeyviewExportSDK-12.3.0/LINUX_X86_64_LIBC6/bin/kvpdf.so`.

    #include "kvpdf.h"
    #include <dlfcn.h>

    void usePDFExport(const char* const pszPathOfkvpdfso)
    {
        void *libHandle = dlopen(pszPathOfkvpdfso, RTLD_LAZY);
        if (libHandle)
        {
            KVPDF_GET_INTERFACE fpGetInterface =
                dlsym(libHandle, "KVPDFGetInterface");
            if (fpGetInterface)
            {
                KVPDFInterface sInterface = {0};
                KVStructInit(&sInterface);
                if(fpGetInterface(&sInterface))
                {
                    // Code using PDF Export
                }
            }
            dlclose(libHandle);
        }
    }

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