std::basic_ostream::seekp

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C++
 
输入/输出库
I / O操纵
C-风格的I / O
缓冲区
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf（过时了）
流
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Streams
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抽象
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
文件I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
字符串I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
阵列的I / O
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Array I/O
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istrstream（过时了）
ostrstream（过时了）
strstream（过时了）
类型
Original:
Types
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streamoff
streamsize
fpos
Error类的接口
Original:
Error category interface
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iostream_category（C++11）
io_errc（C++11）
 
std::basic_ostream
全局对象
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Global objects
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成员函数
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Member functions
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basic_ostream::basic_ostream
basic_ostream::~basic_ostream
basic_ostream::operator=（C++11）
格式化的输入
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Formatted input
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basic_ostream::operator<<
未格式化的输入
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Unformatted input
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basic_ostream::put
basic_ostream::write
定位
Original:
Positioning
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basic_ostream::tellp
basic_ostream::seekp
杂项
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Miscellaneous
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basic_ostream::flush
basic_ostream::swap（C++11）
会员类别
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Member classes
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basic_ostream::sentry
非成员函数
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Non-member functions
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operator<<(std::basic_ostream)
 
basic_ostream& seekp( pos_type pos );
 (1)
basic_ostream& seekp( off_type off, std::ios_base::seekdir dir);
 (2)
设置的输出位置指示器的当前相关的streambuf对象.
Original:
Sets the output position indicator of the current associated streambuf object.
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首先，构建了一个sentry对象，检查错误，并刷新了tie（）'D输出流的流。 （C++11 起）之后
Original:
First, constructs a sentry object which checks the stream for errors and flushes the tie()'d output streams. （C++11 起） Afterwards,
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1)
设置输出位置指示器，以绝对的（相对于开头的文件）的值通过调用posrdbuf()->pubseekoff(pos, std::ios_base::out)。如果在调用返回(pos_type)-1，执行setstate(failbit).
Original:
sets the output position indicator to absolute (relative to the beginning of the file) value pos by calling rdbuf()->pubseekoff(pos, std::ios_base::out). If the call returns (pos_type)-1, executes setstate(failbit).
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2)
设置输出位置指示器，以抵消off相对于dir通过调用rdbuf()->pubseekoff(off, dir, std::ios_base::out)。不报告错误.
Original:
sets the output position indicator to offset off relative to dir by calling rdbuf()->pubseekoff(off, dir, std::ios_base::out). Does not report errors.
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目录

[编辑] 参数

pos -
绝对位置设置输出位置指示器.
Original:
absolute position to set the output position indicator to.
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off -
相对位置来设置输出位置指示器.
Original:
relative position to set the output position indicator to.
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dir -
定义应用的相对偏移量的基础地位。它可以是以下常量之一：
常数
Original:
Constant
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 Explanation
beg
流的开头
Original:
the beginning of a stream
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end
流的结束
Original:
the ending of a stream
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cur
流中的当前位置的位置指示器
Original:
the current position of stream position indicator
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Original:
defines base position to apply the relative offset to. It can be one of the following constants:
常数
Original:
Constant
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 Explanation
beg
流的开头
Original:
the beginning of a stream
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end
流的结束
Original:
the ending of a stream
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cur
流中的当前位置的位置指示器
Original:
the current position of stream position indicator
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[编辑] 返回值

*this

[编辑] 例外

1)
在失败的情况下，可能会引发std::ios_base::failure，如果exceptions() & failbit != 0.
Original:
May throw std::ios_base::failure in case of failure, if exceptions() & failbit != 0.
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2)
不会抛出，除非rdbuf()->pubseekoff()抛出
Original:
Does not throw unless rdbuf()->pubseekoff() throws
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[编辑] 为例

#include <sstream>
#include <iostream>
 
int main()
{
    std::ostringstream os("hello, world");
    os.seekp(7);
    os << 'W';
    os.seekp(0, std::ios_base::end);
    os << '!';
    os.seekp(0);
    os << 'H';
    std::cout << os.str() << '\n';
}

Output: 

Hello, World!

[编辑] 另请参阅
返回的输出位置指示器
Original:
returns the output position indicator
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（公共成员函数） [edit]
返回输入位置指示器
Original:
returns the input position indicator
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（公共成员函数of std::basic_istream） [edit]
sets the input position indicator
（公共成员函数of std::basic_istream） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/io/basic_ostream/seekp&oldid=28384”