Difference between revisions of "BINSEEK()"
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Revision as of 14:39, 27 October 2009
Purpose
Function to position the file pointer in binary file
Syntax
BINSEEK([<expN1C>,<expN2>,<expN3>])
See Also
BIN2I(), BIN2L(), BIN2W(), BINCLOSE(), BINCREATE(), BINOPEN(), BINREAD(), BINWRITE(), FSEEK(), I2BIN(), L2BIN()
Description
The BINSEEK() function is used to position to a byte offset within a binary file opened with the BINCREATE() or BINOPEN() functions. The <expN1> is the file descriptor which was returned when the file was opened with either the BINCREATE() or BINOPEN() functions. The <expN2> is the byte offset to move the file pointer based on the value defined by <expN3>. The value of <expN3> represents a positioning mode that defines the position from which to start the byte offset. The positioning mode options are:
| Offset | Description |
|---|---|
| 0 | Start from the beginning of file |
| 1 | Start from the current position |
| 2 | Start from the end of file |
The BINSEEK() function returns the new file position relative to the beginning of the file. The binary conversion functions may be used in conjunction with the binary file functions.
Example
fd = binopen("file.obj") count = binread(fd, 4) count = bin2l(count) count = l2bin(count + 1) binseek(fd, 512, 0) binwrite(fd, count) binclose(fd)
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
