GetUserNameEx函数的调用

最近要用mingwin调用GetUserNameEx函数，发现没有lib，只要动态调用了。

#include <Windows.h>

#define KERBEROS_DLL_NAME     "SECUR32.DLL"
#define KRB5_MAX_NAMELEN     256
HINSTANCE                krb5_secdll_hInst = NULL;
typedef enum {
    NameUnknown = 0,
    NameFullyQualifiedDN = 1,
    NameSamCompatible = 2,
    NameDisplay = 3,
    NameUniqueId = 6,
    NameCanonical = 7,
    NameUserPrincipal = 8,
    NameCanonicalEx = 9,
    NameServicePrincipal = 10,
    NameDnsDomain = 12
} EXTENDED_NAME_FORMAT, *PEXTENDED_NAME_FORMAT;


typedef BOOLEAN (WINAPI GETUSERNAMEEX)(EXTENDED_NAME_FORMAT NameFormat,LPTSTR lpNameBuffer,PULONG nSize);

GETUSERNAMEEX     * fp_GetUserNameEx = NULL; /* GetUserNameEx()            */

int _tmain(int argc, _TCHAR* argv[])
{
    krb5_secdll_hInst = LoadLibraryA(KERBEROS_DLL_NAME);
    fp_GetUserNameEx = (GETUSERNAMEEX *) GetProcAddress(krb5_secdll_hInst, "GetUserNameExA");
    /**************************************************************/
    /* Check an memorize whether GetUserNameEx(NameUserPrincipal) */
    /* works -- it only works when an Active Directory is present */
    /**************************************************************/
    {
        char        buf[KRB5_MAX_NAMELEN*2];
        ULONG       buf_size = 0;
        EXTENDED_NAME_FORMAT ef=NameSamCompatible;

        if ((fp_GetUserNameEx)(ef,NULL, &buf_size)==FALSE ) {

        }
        buf_size = sizeof(buf)-1;
        if ((fp_GetUserNameEx)(ef,(LPTSTR) &(buf[0]), &buf_size)!=FALSE ) {
            printf(buf);
        }
    }

    if ( krb5_secdll_hInst != NULL ) {
        FreeLibrary( krb5_secdll_hInst );
        krb5_secdll_hInst = NULL;
    }
    getchar();
    return 0;
}

需要注意的是，第一次调用GetUserNameEx，第二个参数为NULL，第三个参数一定要为0，否则出现内存访问错误。
java 可以使用jna
使用jna 3.3.0的版本

char[] name = new char[100];
// Gets current user extended name
        com.sun.jna.platform.win32.Secur32.INSTANCE.GetUserNameEx(
                com.sun.jna.platform.win32.Secur32.EXTENDED_NAME_FORMAT.NameSamCompatible,
                name, new com.sun.jna.ptr.IntByReference(name.length) );
        String userName = new String(name).trim();
        System.out.println(userName);

使用jna 4.1.0

String remoteUserInfo = Secur32Util
                .getUserNameEx(Secur32.EXTENDED_NAME_FORMAT.NameSamCompatible);
        if (remoteUserInfo != null) {
            String remoteDomain = null, remoteUser = null;
            int atIdx =remoteUserInfo.indexOf("\\");
            if (atIdx > -1) {
                remoteDomain = remoteUserInfo.substring(0, atIdx);
                remoteUser = remoteUserInfo.substring(atIdx + 1);
            } else {
                remoteUser = remoteUserInfo;
            }
            System.out.println(remoteUser);