获取windows所有用户名

#include <LM.h>
#pragma comment(lib, "netapi32.lib")
// See more: http://msdn.microsoft.com/en-us/library/windows/desktop/aa370652(v=vs.85).aspx
void GetAllUserName(std::vector<std::wstring> & allUserName) {
    LPUSER_INFO_1 pBuf = NULL;
    LPUSER_INFO_1 pTmpBuf;
    DWORD dwLevel = 1;
    DWORD dwEntriesRead = 0;
    DWORD dwTotalEntries = 0;
    DWORD dwResumeHandle = 0;
    DWORD dwPrefMaxLen = MAX_PREFERRED_LENGTH;
    NET_API_STATUS nStatus;
    LPTSTR pszServerName = NULL;
    do {
        nStatus = NetUserEnum((LPCWSTR) pszServerName,
            dwLevel,
            FILTER_NORMAL_ACCOUNT, // global users
            (LPBYTE*)&pBuf,
            dwPrefMaxLen,
            &dwEntriesRead,
            &dwTotalEntries,
            &dwResumeHandle);
        if ((nStatus == NERR_Success) || (nStatus == ERROR_MORE_DATA)) {
            if ((pTmpBuf = pBuf) != NULL) {
                for (DWORD i = 0; i < dwEntriesRead; i++) {
                    if (pTmpBuf == NULL) {
                        fprintf(stderr, "An access violation has occurred\n");
                        break;
                    }
                    allUserName.push_back(pTmpBuf->usri1_name);
                    pTmpBuf++;
                }
            }
        }
        else
            fprintf(stderr, "A system error has occurred: %d\n", nStatus);
        if (pBuf != NULL) {
            NetApiBufferFree(pBuf);
            pBuf = NULL;
        }
    }
    while (nStatus == ERROR_MORE_DATA); // end do
    // Check again for allocated memory.
    if (pBuf != NULL)
        NetApiBufferFree(pBuf);
}