Как работать с NetShareAdd?

#include <windows.h>
#include <stdio.h>
#include <LMCONS.H>
#include <LMSHARE.H>

#define ACCESS_ALL              0x7F
#define STYPE_DISKTREE          0

#pragma comment (lib, "netapi32.lib")

int __stdcall WinMain(HINSTANCE hThisInst, HINSTANCE hPrevInst, char *lpCmdLine, int nCmdShow) {
    SHARE_INFO_502 shi;
    DWORD Err;

    shi.shi502_type = STYPE_DISKTREE;
    shi.shi502_current_uses = 0;
    shi.shi502_max_uses = 10;
    shi.shi502_netname = "MyShare";
    shi.shi502_passwd = 0;
    shi.shi502_path = "C:\\";
    shi.shi502_permissions = ACCESS_ALL;
    shi.shi502_remark = "Remark";
    shi.shi502_reserved = 0;
    shi.shi502_security_descriptor = 0;

    DWORD RetErr = NetShareAdd(0, 502, (BYTE*)&shi, &Err);

    char s[100];
    sprintf(s, "Err = %d\nRetErr = %d", Err, RetErr);
    MessageBox(0, s, "Error", MB_OK);

    return 0;
}