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I looked at boost’s mapped_file, and CreateFileMapping/MapViewOfFile, but they seem overly complicated to use.
Anything simpler I can use to overwrite a few bytes here and there in an existing file? Performance is not a very high consideration.
You can use the standard C library directly. fopen then fseek to where you want to write stuff. Or, if you want to be fancy, you can also try mmap.