Updating file random access

18-Aug-2016 06:23

updating file random access-24

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I have even tried a single record without any while loop or if statement and it still does not work. loop: fread( &client, sizeof( struct client Data ), 1, cf Ptr); while (! = 0 ) { client.balance -= service Charge; fseek(cf Ptr, (-1 * sizeof(struct client Data)), SEEK_CUR); fwrite( &client, sizeof( struct client Data ), 1, cf Ptr); } fread( &client, sizeof( struct client Data ), 1, cf Ptr); } In case the plethora of differently-named file variables indicates that some version of your code tried to open the same file multiple times, reading from one version and writing to another: don't do that, and if you really must do it then flush the file between writing to it and trying to read from it.while(fread(&client, sizeof(struct client Data), 1, file Ptr)) { if (Num) { client.balance -= charge; fseek(file Ptr, - sizeof(struct client Data), SEEK_CUR); if (1 !

Methods enable you to set or query the position, and you can then read the data from, or write the data to, that location.

The API consists of a few, easy to use, methods: giving you access to more advanced features, such as mapping a region of the file directly into memory for faster access, locking a region of the file, or reading and writing bytes from an absolute location without affecting the channel's current position.

Submit a bug or feature For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2016, Oracle and/or its affiliates. permit nonsequential, or random, access to a file's contents.

To access a file randomly, you open the file, seek a particular location, and read from or write to that file.

This functionality is possible with the interface extends channel I/O with the notion of a current position.

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