流程上的帮助很小...... [英] Little help on stream...
问题描述
你好，
我试图在c ++代码中摆脱一个sprintf，但是我尝试了几个方法来获得
并且不能弄清楚如何改变：
uint16_t group，uint16_t element;
sprintf（buffer，"％04x |％04x"，group，element）;
到目前为止我有类似的东西：
std :: ostringstream buf;
buf.flags（std :: ios_base :: right | std :: ios_base :: hex）;
buf.width（4）;
buf<< group;
buf<< " |" ;;
buf<< std :: hex<<元素;
std :: string key = buf.str（）;
但似乎没有用......
感谢您的帮助/指针
Mathieu
Hello,
I am trying to get rid a of sprintf in a c++ code, but I tried in
several ways and couldn''t figure out how to change:
uint16_t group, uint16_t element;
sprintf(buffer, "%04x|%04x", group , element);
so far I have something like:
std::ostringstream buf;
buf.flags ( std::ios_base::right |std::ios_base::hex );
buf.width( 4 );
buf << group;
buf << "|";
buf << std::hex << element;
std::string key = buf.str();
But doesn''t seems to work...
Thanks for any help/pointer
Mathieu
推荐答案
" Mathieu Malaterre" <毫安******* @ Mfree.fr>写道...
"Mathieu Malaterre" <ma*******@Mfree.fr> wrote...
我试图摆脱c ++代码中的sprintf，但我尝试了几种方式，并且无法弄清楚如何改变：
uint16_t group，uint16_t element;
sprintf（buffer，"％04x |％04x"，group，element）;
到目前为止，我有类似的东西：
std :: ostringstream buf;
buf.flags（std :: ios_base :: right | std :: ios_base :: hex）;
buf.width（4）;
buf<< group;
buf<< " |" ;;
buf<< std :: hex<<元素;
std :: string key = buf.str（）;
但似乎无法工作......
I am trying to get rid a of sprintf in a c++ code, but I tried in several
ways and couldn''t figure out how to change:
uint16_t group, uint16_t element;
sprintf(buffer, "%04x|%04x", group , element);
so far I have something like:
std::ostringstream buf;
buf.flags ( std::ios_base::right |std::ios_base::hex );
buf.width( 4 );
buf << group;
buf << "|";
buf << std::hex << element;
std::string key = buf.str();
But doesn''t seems to work...
#include< sstream>
#include< string>
#include< iomanip>
int main（）
{
int group = 10，element = 20;
std :: ostringstream buf;
buf<< std :: right<< std :: setw（4）<< std :: setfill（''0''）<< std :: hex<<
group
<< " |"
<< std :: right<< std :: setw（4）<< std :: setfill（''0''）<< std :: hex<<
元素;
std :: string key = buf.str（）;
返回0;
}
而且，就在我们之间，你不必摆脱''sprintf''。整个
C标准库是C ++标准库的一部分。如果使用C功能更容易使用C / B
$ b，请务必这样做。
V
#include <sstream>
#include <string>
#include <iomanip>
int main ()
{
int group = 10, element = 20;
std::ostringstream buf;
buf << std::right << std::setw(4) << std::setfill(''0'') << std::hex <<
group
<< "|"
<< std::right << std::setw(4) << std::setfill(''0'') << std::hex <<
element;
std::string key = buf.str();
return 0;
}
And, just between us, you don''t have to get rid of ''sprintf''. The entire
C Standard Library is part of C++ Standard Library. If something''s easier
to do with a C function, by all means, do it.
V
< br>
" Victor Bazarov" <五******** @ comAcast.net>在消息中写道
news：TYo9d.142704
"Victor Bazarov" <v.********@comAcast.net> wrote in message
news:TYo9d.142704
wV.42458@attbi_s54 ...
wV.42458@attbi_s54...
" Mathieu Malaterre" <毫安******* @ Mfree.fr>写道...
"Mathieu Malaterre" <ma*******@Mfree.fr> wrote...
我试图摆脱c ++代码中的sprintf，但我尝试了几种方式，并且无法弄清楚如何改变：
uint16_t group，uint16_t element;
sprintf（buffer，"％04x |％04x"，group，element）;
到目前为止，我有类似的东西：
std :: ostringstream buf;
buf.flags（std :: ios_base :: right | std :: ios_base :: hex）;
buf.width（4）;
buf<< group;
buf<< " |" ;;
buf<< std :: hex<<元素;
std :: string key = buf.str（）;
但似乎没有用......
#include< sstream>
#include< string>
#include< iomanip>
int main（）
{
int group = 10，element = 20;
std :: ostringstream buf;
buf<< std :: right<< std :: setw（4）<< std :: setfill（''0''）<< std :: hex<<
组
<< " |"
<< std :: right<< std :: setw（4）<< std :: setfill（''0''）<< std :: hex<<
元素;
std :: string key = buf.str（）;
返回0;
}
I am trying to get rid a of sprintf in a c++ code, but I tried in several
ways and couldn''t figure out how to change:
uint16_t group, uint16_t element;
sprintf(buffer, "%04x|%04x", group , element);
so far I have something like:
std::ostringstream buf;
buf.flags ( std::ios_base::right |std::ios_base::hex );
buf.width( 4 );
buf << group;
buf << "|";
buf << std::hex << element;
std::string key = buf.str();
But doesn''t seems to work...
#include <sstream>
#include <string>
#include <iomanip>
int main ()
{
int group = 10, element = 20;
std::ostringstream buf;
buf << std::right << std::setw(4) << std::setfill(''0'') << std::hex <<
group
<< "|"
<< std::right << std::setw(4) << std::setfill(''0'') << std::hex <<
element;
std::string key = buf.str();
return 0;
}
必须重复Setw，但setfill和hex不重复，右边是默认值。
buf<< std :: setfill（''0''）<< std :: hex<< std :: setw（4）<<组<< " |"
std :: setw（4）<<元素;
而且，就在我们之间，你不必摆脱''sprintf''。整个
C标准库是C ++标准库的一部分。如果用C函数更容易做什么，无论如何都要做。
Setw must be repeated but setfill and hex do not, and right is the default.
buf << std::setfill(''0'') << std::hex << std::setw(4) << group << "|"
std::setw(4) << element;
And, just between us, you don''t have to get rid of ''sprintf''. The entire
C Standard Library is part of C++ Standard Library. If something''s easier
to do with a C function, by all means, do it.
绝对。
john
Absolutely.
john
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