我正在尝试在ncurses中创建一个窗口,我在其中编写mysql查询的结果。但查询返回的行数多于终端中的行数。 所以我尝试创建一个打击垫,以便我可以滚动查看结果。
但问题是,终端上没有可见的打击垫。
我只是简化了代码,但它仍然不适合我:
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <ncurses.h>
#include <mysql.h>
#include <my_global.h>
WINDOW *pad;
MYSQL *con;
static int mrow, mcol;
static char *host, *user, *pass;
void quit(void)
{
// close MySQL connection
mysql_close(con);
// end curses
endwin();
}
int main(int argc, char **argv)
{
// initialize curses
initscr();
atexit(quit);
clear();
cbreak();
keypad(stdscr, TRUE);
start_color();
// get terminal size
getmaxyx(stdscr, mrow, mcol);
// open MySQL connection
host = "localhost";
user = "root";
pass = "8$oP.4L!";
con = mysql_init(NULL);
if (con == NULL)
{
exit(1);
}
if (mysql_real_connect(con, host, user, pass, NULL, 0, NULL, 0) == NULL)
{
mysql_close(con);
exit(1);
}
// Cursor off
curs_set(0);
// Get SQL Data
char *query = "SELECT IF((SELECT name FROM zeiterf.stdjobs WHERE nr = zeiterf.wtime.job) != '', (SELECT name FROM zeiterf.stdjobs WHERE nr = zeiterf.wtime.job), job), IF(usr != '', (SELECT vname FROM zeiterf.user WHERE nr = zeiterf.wtime.usr), NULL), IF(usr != '', (SELECT nname FROM zeiterf.user WHERE nr = zeiterf.wtime.usr), NULL), SEC_TO_TIME(SUM(TIME_TO_SEC(tout) - TIME_TO_SEC(tin))) FROM zeiterf.wtime WHERE tout != 0 AND job != '...ENDE' GROUP BY job , usr WITH ROLLUP;";
if (mysql_query(con, query))
{
exit (1);
}
MYSQL_RES *result = mysql_store_result(con);
MYSQL_ROW *row;
int num_fields = mysql_num_fields(result);
int rowcount = mysql_num_rows(result);
// create pad
pad = newpad (rowcount + 1, mcol);
// col titles
wprintw(pad, "Auftrag \tName \t\t\tZeit\n");
while (row = mysql_fetch_row(result))
{
int i = 0;
for (i = 0; i < num_fields; i++)
{
wprintw(pad, "%s\t", row[i]);
}
wprintw(pad, "\n");
}
mysql_free_result(result);
// Show content of pad
int mypadpos = 0;
prefresh(pad, mypadpos, mcol, 0, 0, mrow, mcol);
// wait for exit key
int ch;
while((ch = wgetch(pad)) != 'q')
{
switch (ch)
{
case KEY_UP:
if (mypadpos >= 0)
{
mypadpos--;
}
prefresh(pad, mypadpos, mcol, 0, 0, mrow, mcol);
break;
case KEY_DOWN:
if (mypadpos <= rowcount+1)
{
mypadpos++;
}
prefresh(pad, mypadpos, mcol, 0, 0, mrow-1, mcol);
break;
}
}
// remove window
delwin(pad);
clear();
refresh();
return (0);
}
用
编译gcc -o test testpad.c `mysql_config --libs --cflags` -lncurses
在我的Debian Sid系统上。还尝试了我的带有raspbian的RPi。在两个系统上都有相同的行为。
谁能告诉我我做错了什么?
答案 0 :(得分:3)
我发现了什么问题。在我的代码中它应该是
prefresh(pad, mypadpos, 0, 0, 0, mrow, mcol);