Positioning Inside a File
Most of file functions are associated with data read/write operations. At the same time, using the FileSeek() you can specify the position of a file pointer to a position inside the file, from which the next read or write operation will be performed. The ENUM_FILE_POSITION enumeration contains valid pointer positions, relative to which you can specify the shift in bytes for the next operation.
ENUM_FILE_POSITION
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SEEK_SET
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File beginning
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SEEK_CUR
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Current position of a file pointer
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SEEK_END
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File end
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See also
FileIsEnding, FileIsLineEnding