![](/img/trans.png)
[英]C++, OpenCV: Fastest way to read a file containing non-ASCII characters on windows
[英]Read/Print non-ASCII characters using C++
如何读取和打印这个数组的第一个字符? (不是整个字符串,只有第一个字符)。
char data[]= "£A";
printf("%c", data[0]);
在这里,我尝试了printf("%c", data[2]);
Output:A
但是printf("%c", data[0]);
或printf("%c", data[1]);
不打印任何东西(空白输出)。
代码
#include <cstring>
#include <string>
#include <stdexcept>
#include <iostream>
typedef std::string String;
size_t GetTotalUTF8Chars(const String &data)
{
size_t ret = 0;
for (char value : data)
{
if ((value & 0xc0) != 0x80)
{
++ret;
}
}
return ret;
}
String GetUTF8Char(String data, size_t pos)
{
if(pos >= GetTotalUTF8Chars(data))
{
throw std::length_error(u8"Invalid UTF8 character position");
}
String result;
String::const_iterator it = data.begin();
String::const_iterator beginIterator(it);
size_t utf8pos = 0;
if ((data[0] & 0xc0) != 0x80)
{
it++;
}
while (it != data.end())
{
char value = *it;
if ((value & 0xc0) != 0x80)
{
if (pos == utf8pos)
{
return String(beginIterator, it);
}
beginIterator = it;
utf8pos += 1;
}
it++;
}
return String(beginIterator, it);
}
int main()
{
char cstr[] = u8"Hello🐶🐶World🐶£A";
String str = String(cstr);
std::cout<<"█ With C String"<<std::endl;
for (size_t i = 0; i < GetTotalUTF8Chars(cstr); i++)
{
std::cout << i <<".- " << GetUTF8Char(cstr, i) << std::endl;
}
std::cout<<"█ With C++ String"<<std::endl;
for (size_t i = 0; i < GetTotalUTF8Chars(str); i++)
{
std::cout << i <<".- " << GetUTF8Char(str, i) << std::endl;
}
str = u8"£A";
printf(u8"Position0 = %s / Position1 = %s\n", GetUTF8Char(str,0).c_str(), GetUTF8Char(str, 1).c_str());
try{
std::cout << GetUTF8Char(str, 15) << std::endl;
}
catch(std::exception &ex)
{
std::cout<< "Exception message:" <<ex.what()<<std::endl;
}
return EXIT_SUCCESS;
}
Output
█ With C String
0.- H
1.- e
2.- l
3.- l
4.- o
5.- 🐶
6.- 🐶
7.- W
8.- o
9.- r
10.- l
11.- d
12.- 🐶
13.- £
14.- A
█ With C++ String
0.- H
1.- e
2.- l
3.- l
4.- o
5.- 🐶
6.- 🐶
7.- W
8.- o
9.- r
10.- l
11.- d
12.- 🐶
13.- £
14.- A
Position0 = £ / Position1 = A
Exception message:Invalid UTF8 character position
你的例子
str = u8"£A";
printf(u8"%s\n", GetUTF8Char(str,0).c_str());
printf(u8"%s\n", GetUTF8Char(str,1).c_str());
printf(u8"%s %s\n", GetUTF8Char(str,0).c_str(), GetUTF8Char(str, 1).c_str());
Output
£
A
£ A
您可以在Get UTF8 Char(https://repl.it/@JomaCorpFX/Get-UTF8-char#main.cpp)上尝试此代码
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.