convert binary file to txt file

[xiao]

Can I fullfill this task? Using fred and fwrite?

[Walter Roberson]

In article <f1************ *************** *******@k13g200 0hse.googlegrou ps.com>,
xiao <li*********@gm ail.comwrote:

>Can I fullfill this task? Using fred and fwrite?

Yes, if you know the format of the binary file. Typically,
though, the output portion would be easier if you used
fprintf() or one of its close relatives rather than fwrite():
with fwrite() for the output, you will have to -somehow- do
all of the binary to text string formatting and output buffer
management; fprintf() is designed to do that kind of formatting
and buffer management.
--
"To the modern spirt nothing is, or can be rightly known,
except relatively and under conditions." -- Walter Pater

[CBFalconer]

xiao wrote:

>
Can I fullfill this task? Using fred and fwrite?

If you can find fred.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.

[xiao]

On Jul 23, 11:20 am, CBFalconer <cbfalco...@yah oo.comwrote:

xiao wrote:

Can I fullfill this task? Using fred and fwrite?

If you can find fred.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.

haha, I made a mistake here, I mean fread....but it seems fread does
not working....

[Walter Roberson]

In article <84************ *************** *******@k37g200 0hsf.googlegrou ps.com>,
xiao <li*********@gm ail.comwrote:

>haha, I made a mistake here, I mean fread....but it seems fread does
not working....

Are you opening the file with the 'b' modifier? If not then the
assumption will be that the file is text and binary characters
that -happen- to match the line terminators would be translated
upon reading.

If you are taking care to open with the 'b' modifier, then I suggest
you post a stand-alone code sample of something that "doesn't work",
explaining what you expect it to do and explaining what you see it
doing instead.

--
"If there were no falsehood in the world, there would be no
doubt; if there were no doubt, there would be no inquiry; if no
inquiry, no wisdom, no knowledge, no genius."
-- Walter Savage Landor

[xiao]

On Jul 23, 12:07 pm, [e-mail] c-cnrc.gc.ca (Walter Roberson)
wrote:

In article <84de7aca-4fb9-469c-afc0-6e7b38aa7...@k3 7g2000hsf.googl egroups.com>,

xiao <littledd...@gm ail.comwrote:

haha, I made a mistake here, I mean fread....but it seems fread does
not working....

Are you opening the file with the 'b' modifier? If not then the
assumption will be that the file is text and binary characters
that -happen- to match the line terminators would be translated
upon reading.

If you are taking care to open with the 'b' modifier, then I suggest
you post a stand-alone code sample of something that "doesn't work",
explaining what you expect it to do and explaining what you see it
doing instead.

--
"If there were no falsehood in the world, there would be no
doubt; if there were no doubt, there would be no inquiry; if no
inquiry, no wisdom, no knowledge, no genius."
-- Walter Savage Landor

Here is my program: I just want to converted the input file to see
the content of it. But seems something wrong with opnning the file.
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define MAX_PATH_LENGTH 100000000

/* Define the data structure for the file header information */
typedef struct
{
short num;

} HEADER;

typedef struct
{

short x;

} DATA;

int main(void)
{

short xx,numn;
char disp[MAX_PATH_LENGTH];
int i;
FILE *in, *out;
HEADER nscrdh;
DATA nscrd;

/* Determine the file names to be read from and written to */

/* Open the files to be read from and written to*/
in = fopen("CldTotal Stats_8.dat","r ");
out = fopen("newstats .txt","wt");

/* Read necessary header data into local variables & confirm file
format */
for (i=0; i<84; i++)
{
fread(&nscrdh,s izeof(short),1, in);
numn=nscrdh.num ;
sprintf(disp, "%d \n", numn);
/* Write header, ray information into output file */
fputs(disp, out);
}
for (i=0; i <8960000; i++)
{
fread(&nscrd,1, sizeof(short),i n);
xx= nscrd.x;
sprintf(disp, "%d \n", xx);
fputs(disp, out);
}
fclose(in);
fclose(out);

return 0;
}

[Keith Thompson]

The subject is "convert binary file to txt file". Please include the
full question in the body of the article. Not all newsreaders display
the subject header clearly enough to guarantee that it will be seen.

xiao <li*********@gm ail.comwrites:

Can I fullfill this task? Using fred and fwrite?

Not unless you define the problem more precisely. What kind of
conversion do you want to do?

The answer will almost certainly be yes (though fwrite may not be the
best tool for writing the text file).

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[Richard Heathfield]

xiao said:

<snip>

Here is my program: I just want to converted the input file to see
the content of it. But seems something wrong with opnning the file.

I'll give you six.

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define MAX_PATH_LENGTH 100000000

/* Define the data structure for the file header information */
typedef struct
{
short num;

} HEADER;

typedef struct
{

short x;

} DATA;

int main(void)
{

short xx,numn;
char disp[MAX_PATH_LENGTH];

1) You're asking for an object 100,000,000 bytes in size. C only guarantees
you an object 32,767 bytes in size (65,535 if you have a C99
implementation, which you probably don't).

int i;
FILE *in, *out;
HEADER nscrdh;
DATA nscrd;

/* Determine the file names to be read from and written to */

/* Open the files to be read from and written to*/
in = fopen("CldTotal Stats_8.dat","r ");

2) You don't check that this call succeeded. If it fails, the behaviour of
your program is undefined.

3) If you wanted to open this file in binary mode, you should specify "rb"
as the mode, not just "r".

out = fopen("newstats .txt","wt");

4) You don't check that this call succeeded. If it fails, the behaviour of
your program is undefined.

5) The fopen function has no "wt" mode. If you mean you want a text file,
specify "w".

>
/* Read necessary header data into local variables & confirm file
format */
for (i=0; i<84; i++)
{
fread(&nscrdh,s izeof(short),1, in);

6) Here, you show confusion about whether you're reading a HEADER (you're
passing a pointer to a HEADER object) or a short (you use sizeof(short) in
the call). Clearer: fread(&nscrdh, sizeof nscrdh, 1, in);

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[xiao]

On Jul 23, 2:38 pm, Keith Thompson <[e-mail] rote:

The subject is "convert binary file to txt file". Please include the
full question in the body of the article. Not all newsreaders display
the subject header clearly enough to guarantee that it will be seen.

xiao <littledd...@gm ail.comwrites:

Can I fullfill this task? Using fred and fwrite?

Not unless you define the problem more precisely. What kind of
conversion do you want to do?

The answer will almost certainly be yes (though fwrite may not be the
best tool for writing the text file).

--
Keith Thompson (The_Other_Keit h) [e-mail] <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

I just want to see the contents of the binary file (i mean the numbers
in it) :) The original file is ldTotalStats_8. dat and the new file
is newdata.txt.

[Keith Thompson]

Richard Heathfield <rj*@see.sig.in validwrites:

xiao said:

<snip>

> Here is my program: I just want to converted the input file to see
the content of it. But seems something wrong with opnning the file.

I'll give you six.

>#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define MAX_PATH_LENGTH 100000000

[...]

>char disp[MAX_PATH_LENGTH];

1) You're asking for an object 100,000,000 bytes in size. C only guarantees
you an object 32,767 bytes in size (65,535 if you have a C99
implementation, which you probably don't).

Yes, but that's not necessarily a fatal flaw in the program. If you
really need an object that big, then that's how to declare it. If the
system doesn't support objects that big, then it should reject your
program, which is just what you want.

However, on some systems you may have a better chance of successfully
allocating your huge object using malloc() rather than a file-scope
declaration. This also has the advantage of well-defined behavior if
the allocation fails.

But it's a good idea to read the file in smaller chunks if you can.

The name MAX_PATH_LENGTH implies that it's an upper bound for the
length of a file name (the term "path" is often used, on some systems,
to refer to a full file name, including the directory name). You're
using it as the size of a buffer to contain data read from a file. I
suggest you pick a more meaningful name.

Finally, you only store information in disp, your huge array, in two places:

sprintf(disp, "%d \n", numn);
...
sprintf(disp, "%d \n", xx);

In both cases, you're unlikely to write more than a dozen or so
characters to your buffer. 100 million seems like overkill.

[snip]

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"