std::basic_streambuf::sputn, std::basic_streambuf::xsputn
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< cpp | io | basic streambuf
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| std::streamsize sputn( const char_type* s, std::streamsize count ); |
(1) | |
| protected: virtual std::streamsize xsputn( const char_type* s, std::streamsize count ); |
(2) | |
最派生类调用
2) xsputn(s, count).Original:
Calls
xsputn(s, count) of the most derived class.The text has been machine-translated via Google Translate.
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count字符写入到输出序列中的字符数组，该数组的第一个元素是指向s。如果重复调用sputc()被写入的字符。写作停止count字符时，无论是书面还是会返回调用sputc()traits::eof().Original:
Writes
count characters to the output sequence from the character array whose first element is pointed to by s. The characters are written as if by repeated calls to sputc(). Writing stops when either count characters are written or a call to sputc() would have returned traits::eof().The text has been machine-translated via Google Translate.
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如果把已满（pptr()==epptr()），此功能可致电
overflow()，或达到的效果overflow()调用一些其他的，未指定意思Original:
If the put area becomes full (pptr()==epptr()), this function may call
overflow(), or achieve the effect of calling overflow() by some other, unspecified, means.The text has been machine-translated via Google Translate.
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目录 |
[编辑] 参数
（无）
Original:
(none)
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[编辑] 返回值
成功的字符数写的
Original:
The number of characters successfully written.
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[编辑] 为例
#include <iostream> #include <sstream> int main() { std::ostringstream s1; std::streamsize sz = s1.rdbuf()->sputn("This is a test", 14); s1 << '\n'; std::cout << "The call to sputn() returned " << sz << '\n' << "The output sequence contains " << s1.str(); std::istringstream s2; sz = s2.rdbuf()->sputn("This is a test", 14); std::cout << "The call to sputn() on an input stream returned " << sz << '\n'; }
Output:
The call to sputn() returned 14 The output sequence contains This is a test The call to sputn() on an input stream returned 0
[编辑] 另请参阅
| 调用xsgetn() Original: invokes xsgetn() The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成员函数） | |
