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formated file reading problem

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formated file reading problem

 
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  #1
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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Re: formated file reading problem

 
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  #2
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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Re: formated file reading problem

 
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  #3
Feb 7th, 2008
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Originally Posted by Passmark View Post
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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Re: formated file reading problem

 
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  #4
Feb 7th, 2008
lol, it replaced : fs with the smiley , u know what i mean actually )
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Re: formated file reading problem

 
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  #5
Feb 7th, 2008
Did some research for you, and there is a workaround :

c Syntax (Toggle Plain Text) 
  1. #ifndef __stdio_h__
  2. #include <stdio.h>
  3. #define __stdio_h__
  4. #endif
  5.  
  6. int vsscanf_s (const char * src, const size_t length, const char * format, va_list argList);
  7. int vsscanf_s (const char * src, const size_t length, const char * format, va_list argList)
  8. {
  9.     return _snscanf_s (src, length, format, * (void **) argList);
  10. }
  11.  
  12. int vsscanf (const char * src, const char * format, va_list argList);
  13. int vsscanf (const char * src, const char * format, va_list argList)
  14. {
  15.     return sscanf (src, format, * (void **) argList);
  16. }
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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Re: formated file reading problem

 
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  #6
Feb 7th, 2008
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Originally Posted by kux View Post
lol, it replaced : fs with the smiley , u know what i mean actually )
That's why we insist on people leaning to use CODE tags, as mentioned in the rules you read when you signed up.
The 3 Laws of the Procrastination Society:
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes
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