提取文件扩展名 [英] Extracting the extension of a file

问题描述

一些细节

• 语言:C
• 系统:Linux；使用命令行(终端)， 通过终端
读取文件
• 使用C的用户体验:3 个月

• Language: C
• System: Linux; working with command line (terminal), files are read in through the terminal
• User experience with C: 3 months

我一直在尝试提取给定文件的扩展名，例如"myfile.wld"，以便稍后我可以检查是否在终端上输入了正确类型的文件，然后再进行操作.文件内容.这对于分配是必不可少的

I have been trying to extract the extension of a given file for example "myfile.wld", so that later I can make a check to see if the right type of file has been entered at the terminal before I work on the contents of the file. This is necessary for an assignment

我已经使用函数"strtok"通过定界符"将输入分成多个部分.

I have used the function "strtok" to separate the input into sections by a delimiter "."

dot=strtok(argv[1], ".");
filename=dot;

文件名现在是输入"myfile"的第一部分，我的问题是如何到达."之后的第二部分，请告知，请耐心等待，以使其尽可能简单，以便我可以利用您的回复

filename is now the first part of the input "myfile", my question is how can I get to the second part after the ".", please advise, and please be patient enough to make it as simple as possible so that I can make use of your replies

谢谢

推荐答案

char *extension;
extension=strtok(NULL, ".");

在您上面的代码之后.

首先，像这样的strtok(str, ".")一样，用指向str的指针调用strtok().
然后继续调用strtok(NULL, ".")作为下一个令牌.
如果返回的值为null(\0)，则它是字符串的结尾.

First, call strtok() with pointer to str like this strtok(str, ".").
Then keep calling strtok(NULL, ".") for next token.
When the returned value is null (\0) then it is end of string.

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