MLSeekToMark()

MLMARK MLSeekToMark(MLINK link, MLMARK mark, int n)
进入链接中在指定标记之后位置 n 的表达式.

更多信息更多信息

  • MLSeekToMark() 在错误事件中返回 (MLMARK)0,否则为 mark.
  • MLSeekToMark()MathLink 的标头文件 mathlink.h 中被声明.

范例范例打开所有单元关闭所有单元

基本范例 (1)基本范例 (1)

#include "mathlink.h"

/* look ahead in the expression stream on a link and reset */

void f(MLINK lp)
{
    MLMARK mark;
    
    mark = MLCreateMark(lp);
    if(mark == (MLMARK)0)
        { /* unable to create mark in the stream on lp */ }

    /* now peek ahead and see what is coming */
    switch(MLGetNext(lp))
    {
        case MLTKINT:
            /* integer data */
        case MLTKREAL:
            /* floating-point data */
    }

    /* now restore to the original point */
    mark = MLSeekToMark(lp, mark, 0);
    if(mark == (MLMARK)0)
        { /* unable to seek to the mark position in lp */ }

    MLDestroyMark(lp, mark);
}
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