[英]Empty check with string split
vector<string> SplitString (string aString,char *sep)
{
vector<string> vec;
char * cstr,*val,*p;
string str = aString;
cstr = new char [str.size()+1];
strcpy (cstr, str.c_str());
p=strtok (cstr,sep);
while(p!=NULL)
{
vec.push_back(p);
p=strtok(NULL,sep);
}delete[] cstr;return vec; }
This is my code to string split. 这是我的字符串拆分代码。 I sent the below string to split with separator '&'
我发送了以下字符串以使用分隔符'&'进行拆分
"f0=fname0&l0=lname0&f1=fname1&l1=lname1&f2=fname2&l2=lname2&f3=&l3=".
“ f0 = fname0&l0 = lname0&f1 = fname1&l1 = lname1&f2 = fname2&l2 = lname2&f3 =&l3 =”。
I got result in the vector as below. 我得到如下向量的结果。
f0=fname0 l0=lname0 f1=fname1 l1=lname1 f2=fname2 l2=lname2 f3= l3=
f0 = fname0 l0 = lname0 f1 = fname1 l1 = lname1 f2 = fname2 l2 = lname2 f3 = l3 =
Now I again the sent the resulted strings with separator '='. 现在,我再次发送带有分隔符“ =”的结果字符串。 Its working fine with "l2=lname2".
使用“ l2 = lname2”可以正常工作。 But for "f3=" and "l3=" My separator at last position of the string.
但是对于“ f3 =”和“ l3 =”我的分隔符位于字符串的最后位置。 So I couldn't find the value is null or not .
所以我找不到该值是否为null。 I want to know whether the value ( left side of '=' is name and right side one is value ) is empty or not.
我想知道值(“ =”的左侧是名称,右侧的一个是value)是否为空。 How can i check this.
我该如何检查。
How about boost? 怎么样? I think it is easiest way to split string.
我认为这是分割字符串的最简单方法。
#include <algorithm>
#include <iterator>
#include <boost/algorithm/string.hpp>
using namespace std;
using namespace boost;
int main()
{
string s("f0=fname0&l0=lname0&f1=fname1&l1=lname1&f2=fname2&l2=lname2&f3=&l3=");
vector<string> v1;
split(v1, s, is_any_of("&"), token_compress_on);
copy(v1.begin(), v1.end(), ostream_iterator<string>(cout, "\n"));
for (auto i : v1) {
vector<string> v2;
split(v2, i, is_any_of("="), token_compress_on);
copy(v2.begin(), v2.end(), ostream_iterator<string>(cout, "\n===\n"));
}
}
Check whether the last character of the string you're tokenising is in fact the seperator itself. 检查您要标记的字符串的最后一个字符是否实际上是分隔符本身。
while (p != NULL && p[strlen(p) - 1] != *sep)
string::find
and string::replace
to replace occurrences of "=&" with "=hi&" and a terminating "=" with "=hi".
string::find
和string::replace
对其进行修改,以将出现的“ =&” string::replace
为“ = hi&”,并将终止的“ =”替换为“ = hi” 。
In that way you'll avoid awkward parsing.
Also, then you won't need two passes of the tokenising because the strDelimit
parameter of strtok
can then be "&=" (both delimiters in one pass). 同样,您将不需要进行两次标记化,因为
strtok
的strDelimit
参数可以为“&=”(一次通过两个定界符)。
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