cout<< setw与åäö的对齐方式不正确 [英] cout << setw doesn't align correctly with åäö
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问题描述
以下代码重现了我的问题:
The following code reproduces my problem:
#include <iostream>
#include <iomanip>
#include <string>
void p(std::string s, int w)
{
std::cout << std::left << std::setw(w) << s;
}
int main(int argc, char const *argv[])
{
p("COL_A", 7);
p("COL_B", 7);
p("COL_C", 5);
std::cout << std::endl;
p("ABC", 7);
p("ÅÄÖ", 7);
p("ABC", 5);
std::cout << std::endl;
return 0;
}
这将产生以下输出:
COL_A COL_B COL_C
ABC ÅÄÖ ABC
如果我将代码中的ÅÄÖ更改为例如 ABC,那么它起作用了:
If i change "ÅÄÖ" in the code to e.g. "ABC", then it works:
COL_A COL_B COL_C
ABC ABC ABC
为什么会这样?
推荐答案
将 std :: wcout
插入适当的语言环境,您可能还必须切换到宽字符串。例如:
Along with imbuing std::wcout
with the proper locale, you probably have to switch to wide strings as well. For example:
void p(std::wstring s, int w)
{
std::wcout << std::left << std::setw(w) << s;
}
int main(int argc, char const *argv[])
{
setlocale(LC_ALL, "en_US.utf8");
std::locale loc("en_US.UTF-8");
std::wcout.imbue(loc);
p(L"COL_A", 7);
p(L"COL_B", 7);
p(L"COL_C", 5);
std::wcout << std::endl;
p(L"ABC", 7);
p(L"ÅÄÖ", 7);
p(L"ABC", 5);
std::wcout << std::endl;
return 0;
}
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