Running After Effects Script through Apple Event Manager API

aem.c

#include <stdio.h>
#include <stdlib.h>
#include <CoreServices/CoreServices.h>
    
   
static OSErr create_application_desc_from_bundle_id(AEAddressDesc *event, const char *bundle)
{
    OSErr err;
    return AECreateDesc(
        typeApplicationBundleID,
        bundle,
        strlen(bundle),
        (AEDesc *)event
    );
}

int main()
{
    OSErr err;
    AEAddressDesc target;
    int target_initiaized = 0;
    AppleEvent event;
    int event_initialized = 0;

    err = create_application_desc_from_bundle_id(&target, "com.adobe.AfterEffects");
    if (err) {
        fprintf(stderr, "failed to create an application descriptor (%d)\n", err);
        goto out;
    }

    err = AECreateAppleEvent(
        kAEMiscStandards,
        kAEDoScript,
        &target,
        kAutoGenerateReturnID,
        kAnyTransactionID,
        &event
    );
    if (err) {
        fprintf(stderr, "failed to create an apple event (%d)\n", err);
        goto out;
    }

    event_initialized = 1;

    err = AEPutParamPtr(&event, keyDirectObject, typeText, "$.write(\"test\");", sizeof("$.write(\"test\");") - 1);
    if (err) {
        fprintf(stderr, "failed to append a parameter to the event (%d)\n", err);
        goto out;
    }

    {
        AppleEvent reply;
        err = AESendMessage(&event, &reply, kAENeverInteract | kAEWaitReply | kAECanSwitchLayer | kAENormalPriority, kAEDefaultTimeout);
        if (err) {
            fprintf(stderr, "failed to send a message (%d)\n", err);
            goto out;
        }
        AEDisposeDesc((AEDesc *)&reply);
    }
    fprintf(stderr, "message successfully sent.\n");

out:
    if (target_initiaized) {
        AEDisposeDesc((AEDesc *)&target);
    }
    if (event_initialized) {
        AEDisposeDesc((AEDesc *)&event);
    }
    if (err) {
        return 1;
    }
    return 0;
}