如何写入包含C中目录名的文件？ [英] How to write to a file including directory name in C?

问题描述

亲爱的：


我正在尝试写一个文件，其中包含完整的目录名和文件名

指定（./outdir/mytestout.txt其中。是当前目录）

C编程语言并且在Unix下，但是出现了错误，无法打开
打开文件./outdir/mytestout.txt。以下是代码：


#include< stdio.h>


int main（无效）

{

FILE * fp;

char fname [30];

char pathname [30];


strcpy（fname，" ./ outdir / mytestout.txt"）;

fp = fopen（fname，" w"）;

if（fp == NULL）

{

printf（无法打开文件％s \ n，fname）;

}

其他

{

fprintf（fp，这只是一个测试）;

}


fclose;


返回0;


}


我也尝试使用.\outdir

\ mytestout.txt或.// outdir // mytestout.txt来编写文件名和目录。或，，。\\outdir \

\ mytestout.txt"，甚至，。/ / outdir /// mytestout.txt等等，我也用
尝试用当前目录指定整个目录。

（点）替换为真实目录名，但都失败了。我在互联网上搜索了

，发现只有一个相关的说明用完整路径指定

文件名，但如何在Unix下用C指定完整路径？

请帮帮我。


感谢您的帮助。


Hongyu

解决方案

8月11日，5：26 * pm，Hongyu< hongyu ... @ yahoo.comwrote：

亲爱的all：


我正在尝试写入一个文件，其中包含完整的目录名和文件名

指定（./outdir/mytestout.txt，其中。是目前的目录）

C编程语言和Unix下的，但是出现了错误的错误

打开文件./outdir/mytestout.txt。以下是代码：


#include< stdio.h>


int main（无效）

{

* * FILE * fp;

* * char fname [30];

* * char pathname [30];


* * strcpy（fname，" ./ outdir / mytestout.txt"）;

* * fp = fopen（fname，" w"）;

* * if（fp == NULL）

* * {

* * * printf（"无法打开文件％s \ n"，fname）;

* *}

* *其他

* * {

* * * fprintf（fp，这只是一个测试）;

* *}


* * fclose;


* *返回0;


}


我也尝试使用.\outdir编写文件名和目录

\ mytestout.txt"，或者，.// outdir // mytestout.txt或，，。\\outdir \

\ mytestout.txt"，甚至，。/ / outdir /// mytestout.txt等等，我也用
尝试用当前目录指定整个目录。

（点）替换为真实目录名，但都失败了。我在互联网上搜索了

，发现只有一个相关的说明用完整路径指定

文件名，但如何在Unix下用C指定完整路径？

请帮帮我。


感谢您的帮助。


Hongyu

还有一个信息。实际上，我在fclose行中的代码已被修改为fclose（fp），但我仍然收到错误无法打开

文件./outdir/ mytestout.txt

分段错误。

Hongyu写道：

我正在尝试写入一个文件，其中包含完整的目录名和文件名

指定（./outdir/mytestout.txt，其中。是当前目录）

C编程语言，在Unix下，[..]

尝试新闻：comp.lang.c或众多Unix新闻组中的任何一个。一般来说，应该避免

相对路径。


V

-

请删除资金''A'在通过电子邮件回复时

我没有回复最热门的回复，请不要问

8月11日下午5：48 *，Victor Bazarov< v.Abaza ... @ comAcast.netwrote：

Hongyu写道：
< blockquote class =post_quotes>
我正在尝试写一个文件，其中包含完整的目录名和文件名

指定（./outdir/mytestout.txt，其中。是当前目录）在

C编程语言和Unix下，[..]

尝试新闻：comp.lang.c或任何众多的Unix新闻组。 *一般来说，

相对路径应该避免。


V

-

请删除资本''A'在通过电子邮件回复时

我没有回复最热门的回复，请不要问

谢谢。我会试试。

Dear all:

I am trying to write to a file with full directory name and file name
specified (./outdir/mytestout.txt where . is the current directory) in
C programming language and under Unix, but got errors of Failed to
open file ./outdir/mytestout.txt. Below is the code:

#include <stdio.h>

int main(void)
{
FILE *fp;
char fname[30];
char pathname[30];

strcpy(fname,"./outdir/mytestout.txt");
fp=fopen(fname, "w");
if (fp == NULL)
{
printf("Failed to open file %s\n", fname);
}
else
{
fprintf(fp, "This is just a test only");
}

fclose;

return 0;

}

I also try to write filename and directory with ,".\outdir
\mytestout.txt", or ,".//outdir//mytestout.txt" or ",".\\outdir\
\mytestout.txt", or even ,".///outdir///mytestout.txt" etc, and I also
tried to specify the whole directory with the current directory .
(dot) replaced by the real directory name, but all failed. I searched
on the internet and only found one relevant that said to specify
filename with full path, but how to specify full path in C under Unix?
Please help me.

Thanks for the help in advance.

Hongyu

解决方案

On Aug 11, 5:26*pm, Hongyu <[e-mail]:

Dear all:

I am trying to write to a file with full directory name and file name
specified (./outdir/mytestout.txt where . is the current directory) in
C programming language and under Unix, but got errors of Failed to
open file ./outdir/mytestout.txt. Below is the code:

#include <stdio.h>

int main(void)
{
* *FILE *fp;
* *char fname[30];
* *char pathname[30];

* *strcpy(fname,"./outdir/mytestout.txt");
* *fp=fopen(fname, "w");
* *if (fp == NULL)
* *{
* * * printf("Failed to open file %s\n", fname);
* *}
* *else
* *{
* * * fprintf(fp, "This is just a test only");
* *}

* *fclose;

* *return 0;

}

I also try to write filename and directory with ,".\outdir
\mytestout.txt", or ,".//outdir//mytestout.txt" or ",".\\outdir\
\mytestout.txt", or even ,".///outdir///mytestout.txt" etc, and I also
tried to specify the whole directory with the current directory .
(dot) replaced by the real directory name, but all failed. I searched
on the internet and only found one relevant that said to specify
filename with full path, but how to specify full path in C under Unix?
Please help me.

Thanks for the help in advance.

Hongyu

One more information. Actually, my code in the line of fclose has been
corrected as fclose(fp), but I still got error of "Failed to open
file ./outdir/mytestout.txt
Segmentation fault."

Hongyu wrote:

I am trying to write to a file with full directory name and file name
specified (./outdir/mytestout.txt where . is the current directory) in
C programming language and under Unix, [..]

Try news:comp.lang.c or any of the numerous Unix newsgroups. Generally,
relative paths should be avoided.

V
--
Please remove capital ''A''s when replying by e-mail
I do not respond to top-posted replies, please don''t ask

On Aug 11, 5:48*pm, Victor Bazarov <[e-mail]:

Hongyu wrote:

I am trying to write to a file with full directory name and file name
specified (./outdir/mytestout.txt where . is the current directory) in
C programming language and under Unix, [..]

Try news:comp.lang.c or any of the numerous Unix newsgroups. *Generally,
relative paths should be avoided.

V
--
Please remove capital ''A''s when replying by e-mail
I do not respond to top-posted replies, please don''t ask

Thanks. I will try that.

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