Curses基础编程（三）

将原来的例子进行了修改，可以上下翻页显示进程信息，并杀死选中的进程

#include <curses.h>
#include <string.h>

#define MAXROW 1000 //最大行数
#define MAXCOL 500 //最大列数

WINDOW *scrn; //窗口

char cmdoutlines[MAXROW][MAXCOL]; //存储ps -ax输出的进程信息，每行为一个进程

int ncmdlines = 0; //总进程信息数
int winrow = 0; //当前光标位置
int curcmdline = 0; //当前页面输出进程的起始索引

/*当前行高亮*/
void highlight(int line)
{
    attron(A_BOLD); //输出粗体字

    mvaddstr(winrow, 0, cmdoutlines[line]);
    move(winrow, 0);

    attroff(A_BOLD);

    refresh();
}

/*获取进程信息*/
void runpsax()
{
    FILE *p;
    char ln[MAXCOL];
    int row;
    char *tmp;

    p = popen("ps ax", "r");

    for (row = 0; row < MAXROW; row++)
    {
        tmp = fgets(ln, MAXCOL, p);
        if ( tmp == NULL)
            break;
        strncpy(cmdoutlines[row], ln, COLS);
        cmdoutlines[row][MAXCOL-1] = 0;
    }

    ncmdlines = row; //总进程信息数

    pclose(p);
}

/*显示进程信息，startline是数组中的索引*/
void showlines(int startline)
{
    clear();

    if (startline < 0)
    {
        startline = 0;
    }
    else if(startline > ncmdlines)
    {
        startline = ncmdlines;
    }

    if (ncmdlines - startline < LINES)
    {
        if (ncmdlines > LINES)
            startline = ncmdlines - LINES;
        else
            startline = 0;
    }

    curcmdline = startline; //开始输出信息的索引

    //在当前页面输出信息
    for (winrow=0;  winrow < LINES && startline < ncmdlines; winrow++, startline++)
    {
        mvaddstr(winrow, 0, cmdoutlines[startline]);
    }

    refresh();

    --winrow;
    --startline;

    move(winrow, 0);
}

//光标上移
void updown(int inc)
{
    int tmp = winrow + inc;

    if (tmp < 0)
    {
        showlines(curcmdline+tmp);
        winrow = 0;
        highlight(curcmdline);
        move(0, 0);
    }
    else if ( (tmp >= 0) && (tmp < LINES))
    {
        mvaddstr(winrow, 0, cmdoutlines[curcmdline+winrow]);
        winrow = tmp;
        highlight(curcmdline+tmp);
    }
    else
    {
        showlines(curcmdline+inc);
        highlight(curcmdline+winrow);
    }
}

void rerun()
{
    runpsax();
    showlines(0);
}

void prockill() //杀死进程
{
    char *pid;

    pid =strtok(cmdoutlines[curcmdline+winrow], " ");
    kill(atoi(pid), 9);

    rerun();
}

int main()
{
    char c;
    bool quit = false;

    scrn = initscr();

    noecho();
    cbreak();

    runpsax();
    showlines(0);

    while(!quit)
    {
        c = getch();

        switch (c)
        {
            case 'u':
                updown(-1);
                break;
            case 'd':
                updown(1);
                break;
            case 'r':
                rerun();
                break;
            case 'k':
                prockill();
                break;
            case 'q':
                quit = true;
                break;
            default:
                break;
        }
    }

    endwin();
}