在这部分代码中,我想插入空白区域进行打印:
(“tvtime_osd_list_set_multitext”删除前导空格)
行:
snprintf(buf, buf_length, " %s %s", end_time, xmltv_get_next_title( xmltv ) ? xmltv_get_next_title( xmltv ) : "");
tvtime_osd_list_set_multitext( osd, cur++, buf, 1);
代码:
int epg_show_nowandnext( tvtime_osd_t* osd, int page, station_mgr_t *stationmgr, xmltv_t *xmltv )
{
if (!page)
return 0;
if ( xmltv ){
const int buf_length = 255;
const int max_num_lines = 15;
const int num_station_per_page = max_num_lines / 3;
const int num_stations = station_get_num_stations(stationmgr);
char *old_channel = strdup(xmltv_get_channel(xmltv));
char buf[buf_length+1];
int i, count, cur = 0;
/* List Header */
snprintf(buf, buf_length, "Now showing and next on (%d/%d):", page, num_stations/num_station_per_page);
tvtime_osd_list_set_text( osd, cur++, buf);
tvtime_osd_list_set_hilight(osd, -1);
for (i = (page-1) * num_station_per_page, count = 0; (i < num_stations) && (count < num_station_per_page ); i++, count++) {
const char *xmltv_id = 0;
if (!(xmltv_id = station_get_xmltv_id( stationmgr, i)))
xmltv_id = xmltv_lookup_channel(xmltv, station_get_name( stationmgr, i));
xmltv_set_channel( xmltv, xmltv_id);
xmltv_refresh( xmltv );
/* Channel number + name */
snprintf(buf, buf_length, "[%s] %s:", station_get_channel(stationmgr,i), station_get_name( stationmgr, i));
tvtime_osd_list_set_multitext( osd, cur++, buf, 1);
if (xmltv_get_title( xmltv )) {
char start_time[50];
char end_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 ) );
strftime( end_time, 50, "%H:%M", localtime( &end_timestamp ) );
/* Highlight if current channel */
if (station_get_current_id(stationmgr) == i+1)
tvtime_osd_list_set_hilight(osd, cur-1);
/* 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));
}
tvtime_osd_list_set_multitext( osd, cur++, buf, 1);
/* endtime of current programme + Next program */
snprintf(buf, buf_length, " %s %s", end_time, xmltv_get_next_title( xmltv ) ? xmltv_get_next_title( xmltv ) : "");
tvtime_osd_list_set_multitext( osd, cur++, buf, 1);
} else {
/* No program information available for this channel */
tvtime_osd_list_set_text( osd, cur++, "");
tvtime_osd_list_set_text( osd, cur++, "");
}
}
tvtime_osd_list_set_lines( osd, cur );
tvtime_osd_show_list( osd, 1, 1 );
xmltv_set_channel(xmltv, old_channel);
free(old_channel);
xmltv_refresh( xmltv );
if (cur > 1){
return page;
} else {
return 0;
}
} else {
tvtime_osd_list_set_text( osd, 0, "No program information available" );
tvtime_osd_list_set_lines( osd, 1 );
tvtime_osd_show_list( osd, 1, 1 );
return !page;
}
}
此印刷品采用以下形式:
[05] TV5MONDE:
09:30 La Grange De Meslay Festival:Pavel Haas Quartet
10:00 TV5Monde Le Journal
[06] RAI UNO
我想用水平空格打印这种格式:
[05] TV5MONDE:
09:30 La Grange De Meslay Festival:Pavel Haas Quartet
10:00 TV5Monde Le Journal
[06] RAI UNO
我在代码中放了'*'
/* showing now + next showing */
snprintf(buf, buf_length, "* %s %s", end_time, xmltv_get_next_title( xmltv ) ? xmltv_get_next_title( xmltv ) : "");
tvtime_osd_list_set_multitext( osd, cur++, buf, 1);
输出结果(对我来说很难看):
[05] TV5MONDE:
* 09:30 La Grange De Meslay Festival:Pavel Haas Quartet
* 10:00 TV5Monde Le Journal
[06] RAI UNO
开个玩笑,怎么让char'*'看不见?
答案 0 :(得分:1)
查看各种输出修饰符,特别是字段宽度:http://www.cplusplus.com/reference/clibrary/cstdio/printf/
%10s
之类的东西可以解决问题。
或者,您可以在行的开头添加制表符:'\t'
答案 1 :(得分:1)
buf
包含空格。 tvtime_osd_list_set_multitext
是否可能删除前导空格?
根据你的评论,tvtime_osd_list_set_multitext
删除了前导空格,这就是导致问题的原因。要解决它,也许您可以使用另一个函数来打印空白,或者您可以尝试通过在行的开头打印某种不可见的ASCII字符来“欺骗”它。
答案 2 :(得分:0)
您可以使用选项卡转义码:\ t。例如:
printf("\tHello World!");
答案 3 :(得分:0)
非常有趣的问题。你在哪里收集输出?一种可能的解释是在接收输出的终端/控制台上包装初始空格。一些“内置”IDE控制台窗口会出现这种错误(特别是在过去)。
无论如何,我会根据空格替换你的陈述:
snprintf(buf, buf_length, " %s %s", end_time, xmltv_get_next_title( xmltv ) ? xmltv_get_next_title( xmltv ) : "");
到
snprintf(buf, buf_length, "\t%s %s", end_time, xmltv_get_next_title( xmltv ) ? xmltv_get_next_title( xmltv ) : "");