stop work if invalide binary file

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Hi all,
I'm currently implementating binary file reading in my mfc project.
cocept work so fine but problem arises for wrong input binary file.
like below
my binary file should contain,
4 bytes of header
10 bytes data like
name varies from 5 to 10 bytes.

now when i wrong intput file contain only 5 bytes i got assertion
because i excepted 15 bytes so what is alternative to come out of this error

thanks

Posted 15-Dec-11 0:02am

Coder Block

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Sergey Alexandrovich Kryukov 15-Dec-11 8:11am

Not a question. What's the problem?
--SA

2 solutions

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CPallini · Answer 1 · 2011-12-15T00:13:00

Solution 1

Coder Block wrote:
now when i wrong intput file contain only 5 bytes i got assertion
because i excepted 15 bytes so what is alternative to come out of this error

The alternative, of course, is checking the file length before actually parsing the
file.

Posted 15-Dec-11 0:13am

CPallini

Comments

Coder Block 16-Dec-11 3:29am

but i dont know the size of binaly file then

CPallini 16-Dec-11 3:46am

Why?
You should define carefully the format of your file and do a preliminary check to avoid the debug assertion.

jinzai · Answer 2 · 2012-01-14T21:48:00

You have not said what you are using to do the read. Code would be nice, but...
C has _lseek() to do that and CFile has GetLength(). Not knowing the length of a file you are reading is going to cause you problems over and over again. This is a good example of an area that you should program quite defensively. Otherwise, you will have many bugs waiting to get you in your code.