How to modify the contents inside the file?

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I need to modify the content inside the files.
Inside we have First line having the date and time some number & Guid's and CRC count.
Ex:2015/02/02 09:05:26 123456.35625 ADXBH789-YU78-YUG7-KL9I-ADJKH789 78
In Each time if i press The Button The First Line should changed with CurrentDate &Time and Numbers NewGuid's and New CRC.

Can anyone help me to solve this.
Using MFC VC++

Posted 7-Apr-15 3:31am

Nagesh1245

Updated 7-Apr-15 3:42am

Sergey Alexandrovich Kryukov

v3

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Sergey Alexandrovich Kryukov 7-Apr-15 9:43am

If has nothing to do with MFC and even with Windows.
What have you tried so far?
—SA

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OriginalGriff · Answer 1 · 2015-04-07T04:11:00

If your number is fixed length, then it's pretty simple: just open the file for read-write access, write the new information into the file (making sure it's a fixed size write rather than line based), close the file.

If your number is not a fixed length, then it's a lot nastier:
Open the fire for read, open a new file for write.
Read the first line and discard.
Write the new first line.
Copy the rest of the file.
Close both files.