open file, read a line then, rewind a line
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after fgetl(fid), the file position indicatior will be moved to the next line in the file, how could I rewind the indicator back 1 line in the file so when I call fgetl(fid) the second time it would return the same line?
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Matt J
2012 年 11 月 30 日
編集済み: Matt J
2012 年 11 月 30 日
Use FTELL to measure the position in bytes of each line. Then use FREWIND and/or FSEEK to go to the desired position.
1 件のコメント
Walter Roberson
2012 年 11 月 30 日
Technical note:
If a file is opened with 'rt', which should be used for text files, then the value returned by ftell() is an arbitrary "token" rather than a file offset in bytes. Using the same token will get you to the same position, but you cannot do computations on the tokens.
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