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查找字符串

使用C语言实现

我们经常要用到查找某个字符串的功能，使用C++或者其他高级语言实现起来很简单；但是使用C语言实现就不那么easy了。

切割字符串

strtok函数

char *strtok_s(
   char *strToken,
   const char *strDelimit,
      char **context
);
  • strToken
    要切割的字符串
  • strDelimit
    分隔符
  • context
    为空的字符串地址

匹配字符串

strstr函数

char *strstr(
   const char *str,
   const char *strSearch
); // C only
  • str
    被搜索的字符串
  • strSearch
    要搜索的字符串

函数getStrVal_s

char *getStrVal_s(char *str, char key[])
{
	char* strDelimit = ";";
	char *strSeq = "";
	char *context = NULL;

	char *token = strtok_s((char*)str, strDelimit, &context);
	while (token != NULL) {
		char* temp = strstr(token, key);
		if (temp != NULL)
			strSeq = temp;

		if (token != NULL) {
			token = strtok_s(NULL, strDelimit, &context);
		}

	}

	return strSeq;
}

主程序

int _tmain(int argc, _TCHAR* argv[])
{

    char string[] = "True democracy demands that citizens cannot be thrown in jail because of what they believe;and that businesses can be opened without paying a bribe;It depends on the freedom of citizens to speak their minds and assemble without fear;and on the rule of law and due process that guarantees the rights of all people";
	char* val = getStrVal_s(string, "freedom");

	printf("val: %s", val);

	return 0;
}