C:用 strtok 从字符串中解析空标记 [英] C: Parse empty tokens from a string with strtok

问题描述

我的应用程序生成如下所示的字符串.我需要将分隔符之间的值解析为单个值.

My application produces strings like the one below. I need to parse values between the separator into individual values.

2342|2sd45|dswer|2342||5523|||3654|Pswt

我正在使用 strtok 在循环中执行此操作.对于第五个标记，我得到 5523.但是，我还需要考虑两个分隔符 || 之间的空值.根据我的要求，5523 应该是第六个令牌.

I am using strtok to do this in a loop. For the fifth token, I am getting 5523. However, I need to account for the empty value between the two separators || as well. 5523 should be the sixth token, as per my requirement.

token = (char *)strtok(strAccInfo, "|");

for (iLoop=1;iLoop<=106;iLoop++) { 
            token = (char *)strtok(NULL, "|");
}

有什么建议吗?

推荐答案

在那种情况下，我通常更喜欢 p2 = strchr(p1, '|') 循环和 memcpy(s, p1, p2-p1) 里面.它速度很快，不会破坏输入缓冲区(因此它可以与 const char * 一起使用)并且非常便携(即使在嵌入式上).

In that case I often prefer a p2 = strchr(p1, '|') loop with a memcpy(s, p1, p2-p1) inside. It's fast, does not destroy the input buffer (so it can be used with const char *) and is really portable (even on embedded).

它也是可重入的；strtok 不是.(顺便说一句:可重入与多线程无关.strtok 已经被嵌套循环破坏了.可以使用 strtok_r 但它不是那么可移植.)

It's also reentrant; strtok isn't. (BTW: reentrant has nothing to do with multi-threading. strtok breaks already with nested loops. One can use strtok_r but it's not as portable.)

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