How do I check the causes of different values of one records of a file?

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In my VC++ code;

Process A write a record to a file and process B read the same record of file.
The record structure is like as follows:

struct IDX_HeaderLayout{

char today[8];
char logfile_seq[4];
char log_seq[6];
int start_no;
int end_no;
ULONGLONG current_logsize;
ULONGLONG current_idxsize;
int process_run[3];
int process_link[3];
int last_sdata_no[3]; // <----- This point
char last_time[3][12];
char crlf[2];
}

Very strange event occur that;
When A process write a record to a file and B process read it, but the value of record fields - especially last_data_no fields - are different between two processes.
This is my first experience during my career.
I have checked the source code, structure and file system, directory ... but failed to find the what point of causes....

Please help or advise me.

Thank you in advance.

What I have tried:

One day wasted my today.But failed. I dont know anything now....

Posted 16-Jul-17 22:52pm

Member 12330615

Updated 16-Jul-17 23:13pm

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OriginalGriff 17-Jul-17 4:56am

How does A write it, how doers B read it, and how can you tell it's different?

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Richard MacCutchan · Accepted Answer · 2017-07-16T23:13:00

This is a continuation of your earlier question: Making file in PC, but broken records[^]. Writing a fixed length structure should just work (assuming you do it correctly). And reading it back the same. I already suggested that since this is a binary file, the addition of the CR?F sequence at the end of each resord serves no purpose. All you need is something like:

C++

// to write a single record
fwrite(&logRecord, sizeof(logRecord), 1, handle);

// to read a record
fread(&logRecord, sizeof(logRecord), 1, handle);

Ensure that you call fclose after writing all records.