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Overwriting a file without the risk of a corrupt file You should lock the actual data file while you write its substitute, if there's a chance that a different process could be going through the same protocol that you are describing You can use flock for the file lock
5 Vital Rules You Must Follow to Prevent Overwriting Lost Data Therefore under the circumstance of data loss, you have to try your best to block data overwrite Now, thereinafter, we will expose 5 important rules you must follow in such cases 1 Don’t Keep Device Running or Being Used
How do you safely overwrite a file without data loss if . . . To safely overwrite a file without risking data loss (e g , in case of a crash or exception), follow a write-to-temp-then-replace strategy This ensures the original file remains intact until the new content is fully written and successfully replaces it
c++ - Writing to specific position in a file - Stack Overflow You can't "insert" things in the middle of the file - the only inplace operations you can do is writing the exact same amount of bytes that you are trying to overwrite, i e writing without changing the length of the file
C++ overwriting data in a file at a particular position The problem is with the fstream::app - it opens the file for appending, meaning all writes go to the end of the file To avoid having the content erased, try opening with fstream::in as well, meaning open with fstream::binary | fstream::out | fstream::in
c++ - Write in specific position in file, but erasing the old . . . I want to write something in specific position in already exists file, but I want before writing the new content, erasing the old content in this position For example, assume the following is the content of the target file