Reading and Wirting data file

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Dear My friends:

I have one data file that each record consist of 3 sections. each section of each record paste to 3 richtextboxes and these textboxes.text are read and then write to a data file in the format of binary and forms one record.
I want to open a file and without reading all records, find a specefic record for example no. 3 without reading records 1 to 2. Is there any command for searching a specific string?

record1:
1. some string
2. some image file that must write as bytes
3. some sound attached to this record

record2:
1. some string
2. some image file that must write as bytes
3. some sound attached to this record

record3:
1. some string
2. some image file that must write as bytes
3. some sound attached to this record

.
.
.

so firstly, the lenght of each section of a record is not specific.
secondly, if I close the file, and I want to add some other records to the current file, I must find the no. of last record and add additional records to the file. So is it a straight forward procedure for doing this?

thirdly, how should I modify one record after I create that record?

and finally, if I want to encrypt this file is it possible for others to extract it's content?

Sincerely

Posted 8-Mar-12 2:57am

Mmohmmad

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[no name] 8-Mar-12 9:11am

Why did you ask this again?

BobJanova 8-Mar-12 10:39am

repost

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Tim Groven · Answer 1 · 2012-03-08T03:20:00

One way to do this is for each record, convert to binary, and get the length of the record in bytes. Put that record number and then the length of the record in the file before the record. This will let you read the record number, if it's not the one you want, you get the length and skip that many bytes in the file to the next record.

That's at least for your first question. :)