Question

我希望按星期几从xmltv列表中分组电视节目信息。我写了这段代码：

int epg_show_perchannel( tv_osd_t* osd, int page, station_mgr_t *stationmgr, xmltv_t *xmltv, int channel )
{
if (!page)
    return 0;
if ( xmltv ){
    const int buf_length = 255;
    const int max_num_lines = 15;
    const int num_stations = station_get_num_stations( stationmgr );
    char *old_channel = strdup( xmltv_get_channel( xmltv ) );
    char buf[buf_length+1];
    int cur = 0;
    time_t curtime = time( 0 );
    const char *xmltv_id = 0;

    if (channel > num_stations)  
        channel = 1;
    else if (channel < 1 )
        channel = num_stations;

    if (!(xmltv_id = station_get_xmltv_id( stationmgr, channel-1 ))) 
        xmltv_id = xmltv_lookup_channel( xmltv, station_get_name( stationmgr, channel-1 ));
    xmltv_set_channel( xmltv, xmltv_id);
    xmltv_refresh_withtime( xmltv, curtime );

    /* List header with Channel number + name */
    snprintf(buf, buf_length, "%d Next on [%s] %s:", channel, station_get_channel(stationmgr,channel-1), station_get_name( stationmgr, channel-1));
    tv_osd_list_set_text( osd, cur++, buf );
    tv_osd_list_set_hilight(osd, -1);   

    while ((cur-1) < max_num_lines) {
        xmltv_refresh_withtime( xmltv, curtime );
        /* day of current program*/
        char start_time[50];
        time_t start_timestamp = xmltv_get_start_time( xmltv );
        strftime( start_time, 50, "%A:", localtime( &start_timestamp ) );
        snprintf(buf, buf_length, "%s", start_time, xmltv_get_start_time( xmltv ));
        tv_osd_list_set_text( osd, cur++, buf, 1);

        if (xmltv_get_title( xmltv )) {
            char start_time[50];
            time_t start_timestamp = xmltv_get_start_time( xmltv );
            time_t end_timestamp = xmltv_get_end_time( xmltv );
            strftime( start_time, 50, "%H:%M", localtime( &start_timestamp ) );

            /* starttime of current program + Now showing program */
            snprintf(buf, buf_length, "%s %s", start_time, xmltv_get_title( xmltv ));       
            if (xmltv_get_sub_title( xmltv )){
                strncat(buf," (",buf_length-strlen(buf));  
                strncat(buf,xmltv_get_sub_title( xmltv ),buf_length-strlen(buf));
                strncat(buf,")",buf_length-strlen(buf));  
            }
            tv_osd_list_set_text( osd, cur++, buf, 1);

            if (!xmltv_get_next_title( xmltv )) {
                char end_time[50];
                /* no next program, print endtime of current programme */       
                strftime( end_time, 50, "%H:%M", localtime( &end_timestamp ) );
                snprintf(buf, buf_length, "%s %s", end_time, "");       
                tv_osd_list_set_text( osd, cur++, buf, 1);
            }
        curtime = end_timestamp;**

        } else {
            /* No XMLTV information for this channel */
            tv_osd_list_set_text( osd, cur++, "");
        }

    }
    tv_osd_list_set_lines( osd, cur );
    tv_osd_show_list( osd, 1, 1 );

    xmltv_set_channel(xmltv, old_channel);
    free(old_channel);
    xmltv_refresh( xmltv );

} else {
    tv_osd_list_set_text( osd, 0, "No XMLTV Program Guide information available" );
    tv_osd_list_set_lines( osd, 1 );
    tv_osd_show_list( osd, 1, 1 );
}
return channel;
}

这将提取数据（并从xmltv文件发送到应用程序并使用15行创建列表），但我不知道如何按星期几组合：

当前输出（代码段以：“while（（cur-1）＆lt; max_num_lines）{ “）：

Sunday:
00:20     Luke, mână rece
Sunday:
02:50     Moartea va fi atât de dulce
Sunday:     
04:45     Interviurile : Matthew Modine Despre Kubrick şi Platoşa de metal
Sunday:     
05:00     Ocean's eleven - Faceţi jocurile!
Sunday:     
22:00     Moartea va fi atât de dulce     
Monday:
00:15     Fără suflare
Monday:     
02:30     Celebritate

我想要的（不是每行插入一天的名字，只有当一天结束时）：

Sunday:
00:20     Luke, mână rece     
02:50     Moartea va fi atât de dulce     
04:45     Interviurile : Matthew Modine Despre Kubrick şi Platoşa de metal     
05:00     Ocean's eleven - Faceţi jocurile!     
22:00     Moartea va fi atât de dulce     
Monday:
00:15     Fără suflare     
02:30     Celebritate     
04:40     Sub influenţa lui: Joan Allen     
05:15     Fără suflare     
22:00     Necruţătorul     
Tuesday:
00:30     Point Blank     
02:25     Mumia

提取数据的部分xmltv列表：

<programme start="20120205220000 +0100" stop="20120205225500 +0100" channel="006.port.hu">

感谢。

Answer 1

在伪代码中，假设项目按日期时间排序，您可以这样做：

last_printed_day = null

foreach item in items
    if item.day != last_printed_day
        print item.day
        last_printed_day = item.day
    end
    print item
end

您可能希望跟踪最后打印的实际日期，即使您打印的日期仅格式化为工作日名称。这样，如果你有一个只有周日数据的数据集，你仍然会在每天开始时打印“星期日”。

Answer 2

我还没有真正研究过你的代码你想要做的是检查当天是否与前一天相同，如果不打印它。

将前一天初始化为无效值

char previousday[500] = "invalid"; /* you might want to use less than 500 chars */

并在循环中继续检查

if (strcmp(start_time, previousday) != 0) {
    // print, or add to buffer, start_time
    strcpy(previousday, start_time);
}

按c表示的星期几的组列表

2 个答案: