Strange file corruption

[Artem Moroz]

I have a class that represents a log file. This class has two functions and a member variable CFile m_file First is StartLog conains code m_file.Open(.....); Second StopLog contanis code m_file.Close(); And also there is a function AddEvent like this: m_file.Write(.....); m_file.Flush(); I call StartLog when my program starts, and StopLog when it exits. AddEvent is called several times while program runs; It works fine mostly, but there is a problem: File gets corrupted (it contains junk) when the program gets terminated incorrectly. For example when somebody has rebooted computer or terminates it via task manger. (Close() is not get called in this case) Should I reopen and close file every time I need to write to it to ensure safety of the data??? :confused:

[valikac]

Yes. Add code in the class destructor to close the file. Kuphryn

[Artem Moroz]

I already did. The problem Is that when the program is terminated incorrectly, the garbage appears inside a file sometimes.... You see, the Close() is not called in such a case :(

[valikac]

Yeah. The only solution is to analyze the file as the program opens it. Do CRC check or simply calculate the bytes and remove all extra data. Kuphryn

[Terry ONolley]

M A V wrote: The problem Is that when the program is terminated incorrectly, the garbage appears inside a file sometimes.... If you manually open the file in append mode, write to the file, and then manually close it every time then you are unlikely to experience the corruption you are talking about. The only way it could get corrupted is if the system were incorrectly shut down during the few milliseconds that the file were open.

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