如何打开文件，跳过前2行并获得第50个字符？ [英] How can I open a file, skip first 2 lines and get the 50th character?
问题描述
如何打开文件，跳过前2行并获得第50个字符？
EXP 0 R：\000\un\111\ e00 \ e00noLog \ 1006 \bdry_arc.e00
ARC 2
1 1 0 0 0 0 7
即我想要得到7在第三行，我该怎么做？
thx !!
How can I open a file, skip first 2 lines and get the 50th character?
EXP 0 R:\000\un\111\e00\e00noLog\1006\bdry_arc.e00
ARC 2
1 1 0 0 0 0 7
i.e., I want to get the "7" in the third line, how can I do that?
thx!!
推荐答案
你好，
#include< fstream>
#include< string>
使用命名空间std;
int main（）
{
int RetVal = 0;
ofstream输入（" Filename"）;
if（！Input.is_open（））
{
//可以使用异常，但因为它太小了......
RetVal = 1;
}
其他
{
string Line;
getline（输入，线路）;
getline（输入，线路）;
getline（输入，线路）;
cout<<输入[49]<<结束;
}
返回RetVal;
}
TODO添加一些更多的错误检查。
问候，Ron AF Greve。
" FrancisC" < FR ********** @ hong-kong.crosswinds.net>在留言中写道
news：bm *********** @ news.hgc.com.hk ...
Hi,
#include <fstream>
#include <string>
using namespace std;
int main()
{
int RetVal = 0;
ofstream Input( "Filename" );
if( !Input.is_open() )
{
// Could use exceptions, but since it is so small...
RetVal = 1;
}
else
{
string Line;
getline( Input, Line );
getline( Input, Line );
getline( Input, Line );
cout << Input[ 49 ] << endl;
}
return RetVal;
}
TODO add some more error checking.
Regards, Ron AF Greve.
"FrancisC" <fr**********@hong-kong.crosswinds.net> wrote in message
news:bm***********@news.hgc.com.hk...
如何打开文件，跳过前2行并获得第50个字符？
EXP 0 R：\000\un \111 \ e00 \ e00noLog \ 1006 \bdry_arc.e00
ARC 2
1 1 0 0 0 0 7
即，我希望得到7。在第三行，我该怎么做？
thx !!
How can I open a file, skip first 2 lines and get the 50th character?
EXP 0 R:\000\un\111\e00\e00noLog\1006\bdry_arc.e00
ARC 2
1 1 0 0 0 0 7
i.e., I want to get the "7" in the third line, how can I do that?
thx!!
在我以前的帖子中哎呀那当然应该是ifstream。
问候，Ron AF Greve。
" FrancisC" < FR ********** @ hong-kong.crosswinds.net>在留言中写道
news：bm *********** @ news.hgc.com.hk ...
Oops in my previous post that should be ifstream of course.
Regards, Ron AF Greve.
"FrancisC" <fr**********@hong-kong.crosswinds.net> wrote in message
news:bm***********@news.hgc.com.hk...
如何打开文件，跳过前2行并获得第50个字符？
EXP 0 R：\000\un \111 \ e00 \ e00noLog \ 1006 \bdry_arc.e00
ARC 2
1 1 0 0 0 0 7
即，我希望得到7。在第三行，我该怎么做？
thx !!
How can I open a file, skip first 2 lines and get the 50th character?
EXP 0 R:\000\un\111\e00\e00noLog\1006\bdry_arc.e00
ARC 2
1 1 0 0 0 0 7
i.e., I want to get the "7" in the third line, how can I do that?
thx!!
" FrancisC" < FR ********** @ hong-kong.crosswinds.net>写道：
"FrancisC" <fr**********@hong-kong.crosswinds.net> writes:
如何打开文件，跳过前2行并获得第50个字符？
EXP 0 R：\\\\ \\ _111 \ e00 \ e00noLog \ 1006 \bdry_arc.e00
ARC 2
1 1 0 0 0 0 7
即，我想得到 7英寸;在第三行，我该怎么做？
How can I open a file, skip first 2 lines and get the 50th character?
EXP 0 R:\000\un\111\e00\e00noLog\1006\bdry_arc.e00
ARC 2
1 1 0 0 0 0 7
i.e., I want to get the "7" in the third line, how can I do that?
7是这一行的第70个字符，而不是第50个字符。
使用标准的unix工具做一些事情比重新发明更好：
head -3 bla |尾巴-1 | cut -b 50
亲切的问候
frank
-
弗兰克Schmitt
4SC AG电话：+49 89 700763-0
电子邮件：frankNO DOT SPAMschmitt AT 4sc DOT com
The 7 is the 70th character on this line, not the 50th.
Some things are better done with standard unix tools than reinvented:
head -3 bla | tail -1 | cut -b 50
kind regards
frank
--
Frank Schmitt
4SC AG phone: +49 89 700763-0
e-mail: frankNO DOT SPAMschmitt AT 4sc DOT com
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