如何在文件前面插入两个字节 [英] how to insert tow byte in front of a file
问题描述
（大家好...... ^ _ ^）
我尝试了这些方式：
fstream riaperto（" codici。 dat"，ios :: out | ios :: binary | ios :: app）;
if（riaperto.bad（））{
cerr<<"" errore di apertura"<< endl;
system（" Pause"）;
}
riaperto.seekp （ios :: beg）;
riaperto.put（char（nbyte / 256））;
riaperto.put（char（nbyte％256））;
^ =这个字节写在文件的末尾（好吧，它是
" app"）。
ofstream riaperto（" codici.dat"，ios :: out | ios :: binary）;
if（riaperto.bad（））{
cerr<<"&＃errore di apertura"<< endl;
system（" Pause"）;
}
riaperto.seekp（ios :: beg）;
riaperto.put（char（nbyte / 256））;
riaperto.put（char（nbyte） ％256））;
它在开头写的这个，但是，文件包含o nly那个
两个字节......（覆盖）
我该怎么办？
提前致谢..
Gnafu
(Hi to all... ^_^)
I tryed theese ways:
fstream riaperto( "codici.dat", ios::out|ios::binary|ios::app);
if(riaperto.bad()){
cerr<<"errore di apertura"<<endl;
system("Pause");
}
riaperto.seekp(ios::beg);
riaperto.put(char(nbyte/256));
riaperto.put(char(nbyte%256));
^= This one writes the bytes at the end of the file (allright, it''s the
"app") .
ofstream riaperto( "codici.dat", ios::out|ios::binary);
if(riaperto.bad()){
cerr<<"errore di apertura"<<endl;
system("Pause");
}
riaperto.seekp(ios::beg);
riaperto.put(char(nbyte/256));
riaperto.put(char(nbyte%256));
This one it writes at the beginning but, then, the file contains only that
tow bytes... (overwrite)
What can i do?
Thanks in advance..
Gnafu
推荐答案
Gnafu写道：
Gnafu wrote:
（大家好...... ^ _ ^）
我尝试了这些方式：
fstream riaperto（" codici.dat" ，ios :: out | ios :: binary | ios :: app）;
if（riaperto.bad（））{
cerr<<" errore di apertura"<< endl;
系统（暂停）;
}
riaperto.seekp（ios :: beg）;
riaperto.put（char（nbyte / 256）） ; riaperto.put（char（nbyte％256））;
^ =这个字节写在文件的末尾（好吧，它是
app）。
ofstream riaperto（" codici.dat"，ios :: out | ios :: binary）;
if（riaperto.bad（））{
cerr&l t;<" errore di apertura"<< endl;
system（" Pause"）;
riaperto.seekp（ios :: beg） ;
riaperto.put（char（nbyte / 256））;
riaperto.put（char（nbyte％256））;
这是它在开头写的那个，但是，那么，该文件只包含
那两个字节...（覆盖）
我该怎么办？
提前致谢..
(Hi to all... ^_^)
I tryed theese ways:
fstream riaperto( "codici.dat", ios::out|ios::binary|ios::app);
if(riaperto.bad()){
cerr<<"errore di apertura"<<endl;
system("Pause");
}
riaperto.seekp(ios::beg);
riaperto.put(char(nbyte/256));
riaperto.put(char(nbyte%256));
^= This one writes the bytes at the end of the file (allright, it''s the
"app") .
ofstream riaperto( "codici.dat", ios::out|ios::binary);
if(riaperto.bad()){
cerr<<"errore di apertura"<<endl;
system("Pause");
}
riaperto.seekp(ios::beg);
riaperto.put(char(nbyte/256));
riaperto.put(char(nbyte%256));
This one it writes at the beginning but, then, the file contains only
that
tow bytes... (overwrite)
What can i do?
Thanks in advance..
将您想要的新字节写入临时文件，然后复制原始文件的内容
。如果成功，请将临时文件
重命名为原始名称。
Write the new bytes you want to a temporary file, then copy the content of
the original file over. If that was successful, rename the temporary file
to the name of the original.
文章< e7 ** ***********@news.t-online.com>，
ra ** **** @ t-online.de 说...
[...]
In article <e7*************@news.t-online.com>,
ra******@t-online.de says...
[ ... ]
写新的你想要一个临时文件的字节，然后复制原始文件的内容。如果成功，请将临时文件重命名为原始名称。
Write the new bytes you want to a temporary file, then copy the content of
the original file over. If that was successful, rename the temporary file
to the name of the original.
....并希望没有其他硬链接文件 -
因为如果有，你现在有两个单独的文件，
和所有其他硬链接指向未经修改的
文件。
-
后来，
杰瑞。
宇宙是一个自己想象的虚构。
....and hope there are no other hard links to the file --
because if there are, you now have two separate files,
and all of the other hard links point to the unmodified
file.
--
Later,
Jerry.
The universe is a figment of its own imagination.
>将您想要的新字节写入临时文件，然后复制原始文件的
> Write the new bytes you want to a temporary file, then copy the content of
的内容。如果成功，请将临时文件重命名为原始名称。
the original file over. If that was successful, rename the temporary file
to the name of the original.
我不想这样做.... :(
好的，不管怎样，谢谢..
I wanted to not do that.... :(
Ok, thank anyway..
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