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formated file reading problem

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Posts: 119

Reputation: kux is on a distinguished road

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kux

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Junior Poster

formated file reading problem

Feb 7th, 2008

As i knew the <stdarg.h> header should have the following function

int vfscanf(FILE *stream, const char *format, va_list ap);

but under Visual Studio 2005, after including the header and calling the function i get
'vfscanf': identifier not found

if the function is not declared, can u tell me some simmilar functions that do the same
thing and have the same parameters?

thx

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Reputation: Passmark is an unknown quantity at this point

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Passmark

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Re: formated file reading problem

Feb 7th, 2008

I don't think it is supported. A replacement might be fscanf() + some extra code, but it really depends on what you are doing with with vfscanf.

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kux

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Re: formated file reading problem

Feb 7th, 2008

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Originally Posted by Passmark

I don't think it is supported. A replacement might be fscanf() + some extra code, but it really depends on what you are doing with with vfscanf.

hmmm, what i am doing is that i want to wrap my formated file read in a File class that i design myself so that it throws exceptions for every problem that might occur.
what i want to is to have a Scan method in my File class that looks like

void File:

can ( const char * Format, ... )
{
va_list objArgs;
va_start( objArgs, pcFormat );
vfscanf( m_pFile, pcFormat, objArgs ); // m_pFile is the file handle
va_end( objArgs );
}

this is actually wraping fscanf in File:

can

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Posts: 119

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kux

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Re: formated file reading problem

Feb 7th, 2008

lol, it replaced : fs with the smiley , u know what i mean actually

)

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niek_e

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Nearly a Posting Maven

Re: formated file reading problem

Feb 7th, 2008

Did some research for you, and there is a workaround :

 Help with Code Tags 
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#ifndef __stdio_h__
#include <stdio.h>
#define __stdio_h__
#endif
 
int vsscanf_s (const char * src, const size_t length, const char * format, va_list argList);
int vsscanf_s (const char * src, const size_t length, const char * format, va_list argList)
{
    return _snscanf_s (src, length, format, * (void **) argList);
}
 
int vsscanf (const char * src, const char * format, va_list argList);
int vsscanf (const char * src, const char * format, va_list argList)
{
    return sscanf (src, format, * (void **) argList);
}
#ifndef __stdio_h__
#include <stdio.h>
#define __stdio_h__
#endif

int vsscanf_s (const char * src, const size_t length, const char * format, va_list argList);
int vsscanf_s (const char * src, const size_t length, const char * format, va_list argList)
{
    return _snscanf_s (src, length, format, * (void **) argList);
}

int vsscanf (const char * src, const char * format, va_list argList);
int vsscanf (const char * src, const char * format, va_list argList)
{
    return sscanf (src, format, * (void **) argList);
}

Just throw that in the file where you're using vsscanf and it should work again.
If you use this code, use the vsscanf_s instead of the vsscanf if you want to avoid getting anoying "sscanf was declared deprecated" warnings.

Hope this helps. If it doesn't, post some sample data from your file and you'll get advice how to make your own function for it.

Niek

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