LookupNPID

//$(SCE_PS3_ROOT)\target\ppu\lib\libsysutil_np_stub.a

#include <np.h>

struct npclient_info_t {
    SceNpId npId;
    sys_ppu_thread_t cmd_tid;
    struct Friendlist *friendlist;
    int32_t titleCtxId;
    int32_t lookupTitleCtxId;
    int32_t tusTitleCtxId;
};

int doLookupNpId(const char *onlineIdString, SceNpId *npId)
{
    int32_t ret, tmp;
    int32_t transId = 0;
    int32_t lookupTitleCtxId;

    SceNpOnlineId onlineId;

    memset(&onlineId, 0, sizeof(onlineId));
    strncpy(onlineId.data, onlineIdString, SCE_NET_NP_ONLINEID_MAX_LENGTH);

    ret = sceNpLookupCreateTransactionCtx(lookupTitleCtxId);
    transId = ret;

    ret = sceNpLookupNpId(transId, &onlineId, npId, NULL);

    return ret;
}