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Full Discussion: Conversion from ASCII to binary for physical simulation code in C/C++
Top Forums UNIX for Advanced & Expert Users Conversion from ASCII to binary for physical simulation code in C/C++ Post 302507410 by Corona688 on Wednesday 23rd of March 2011 06:56:01 PM
Old 03-23-2011
No, they're completely different... The variables in a C program start as binary, and one of sprintf's jobs is to convert binary into ASCII. You're converting binary numbers into an ASCII string then writing the ASCII string to file.

My example doesn't convert -- it writes the variable direct, as binary. You could read them in as ASCII with with fgets and sscanf, then just write them back out raw as binary.
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT PHP

odbc_binmode

ODBC_BINMODE(3) 							 1							   ODBC_BINMODE(3)

odbc_binmode - Handling of binary column data

SYNOPSIS

       bool odbc_binmode (resource  $result_id, int  $mode)

DESCRIPTION

	Enables handling of binary column data. ODBC SQL types affected are BINARY, VARBINARY, and LONGVARBINARY.

	When  binary  SQL  data  is converted to character C data, each byte (8 bits) of source data is represented as two ASCII characters. These
       characters are the ASCII character representation of the number in its hexadecimal form. For example, a binary  00000001  is  converted	to
       "01" and a binary 11111111 is converted to "FF".

       LONGVARBINARY handling

       +----------------------+----------------+---+
       |       binmode	      | 	       |   |
       |		      | 	       |   |
       |		      |  longreadlen   |   |
       |		      | 	       |   |
       |		      |     result     |   |
       |		      | 	       |   |
       +----------------------+----------------+---+
       |		      | 	       |   |
       |ODBC_BINMODE_PASSTHRU | 	       |   |
       |		      | 	       |   |
       |		      |       0        |   |
       |		      | 	       |   |
       |		      |    passthru    |   |
       |		      | 	       |   |
       |		      | 	       |   |
       | ODBC_BINMODE_RETURN  | 	       |   |
       |		      | 	       |   |
       |		      |       0        |   |
       |		      | 	       |   |
       |		      |    passthru    |   |
       |		      | 	       |   |
       |		      | 	       |   |
       |ODBC_BINMODE_CONVERT  | 	       |   |
       |		      | 	       |   |
       |		      |       0        |   |
       |		      | 	       |   |
       |		      |    passthru    |   |
       |		      | 	       |   |
       |		      | 	       |   |
       |ODBC_BINMODE_PASSTHRU | 	       |   |
       |		      | 	       |   |
       |		      |       0        |   |
       |		      | 	       |   |
       |		      |    passthru    |   |
       |		      | 	       |   |
       |		      | 	       |   |
       |ODBC_BINMODE_PASSTHRU | 	       |   |
       |		      | 	       |   |
       |		      |       >0       |   |
       |		      | 	       |   |
       |		      |    passthru    |   |
       |		      | 	       |   |
       |		      | 	       |   |
       | ODBC_BINMODE_RETURN  | 	       |   |
       |		      | 	       |   |
       |		      |       >0       |   |
       |		      | 	       |   |
       |		      |  return as is  |   |
       |		      | 	       |   |
       |		      | 	       |   |
       |ODBC_BINMODE_CONVERT  | 	       |   |
       |		      | 	       |   |
       |		      |       >0       |   |
       |		      | 	       |   |
       |		      | return as char |   |
       |		      | 	       |   |
       +----------------------+----------------+---+
	If odbc_fetch_into(3) is used, passthru means that an empty string is returned for these columns.

PARAMETERS

	      o $result_id
		- The result identifier.  If $result_id is 0, the settings apply as default for new results.

	      Note

		      Default  for longreadlen is 4096 and $mode defaults to ODBC_BINMODE_RETURN. Handling of binary long columns is also affected
		     by odbc_longreadlen(3).

	      o $mode
		- Possible values for $mode are:

		     o ODBC_BINMODE_PASSTHRU: Passthru BINARY data

		     o ODBC_BINMODE_RETURN: Return as is

		     o ODBC_BINMODE_CONVERT: Convert to char and return

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

PHP Documentation Group 													   ODBC_BINMODE(3)
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