Unzip a file into a directory I specified

ZRESULT TUnzip::Open(void *z,unsigned int len,DWORD flags)
{
    if (uf!=0 || currentfile!=-1) 
        return ZR_NOTINITED;

    GetCurrentDirectory(MAX_PATH,rootdir);
    _tcscat(rootdir,_T("\\temp")); //add temp dir, but can not work 
    _tcscat(rootdir,_T("\\");

    if (flags==ZIP_HANDLE)
    { 
        DWORD type = GetFileType(z);
        if (type!=FILE_TYPE_DISK) 
            return ZR_SEEK;
    }
    ZRESULT e; 
    LUFILE *f = lufopen(z,len,flags,&e);
    if (f==NULL) 
        return e;
    uf = unzOpenInternal(f);
    //return ZR_OK;
    return zopenerror; //+++1.2
}