Low-Level File Functions
These functions make it possible for you to manipulate files and communication ports at a low level. Low-level file functions should be used carefully, especially when manipulating table files. Before using these functions, test them on sample files before using them on files that contain important data.
Use |
To |
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Change the size of a file opened with a low-level file function. |
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Flush and close a file or communication port opened with a low-level file function. |
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Create and open a low-level file. |
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Determine whether the file pointer is positioned at the end of a file. |
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Return a number corresponding to the most recent low-level file function error. |
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Flush to disk a file opened with a low-level function. |
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Return a series of bytes from a file or a communication port opened with a low-level file function until it encounters a carriage return. |
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Open a file for use with low-level file functions. |
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Write a character string, carriage return, and line feed to a file opened with a low-level file function. |
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Return a specified number of bytes from a file opened with a low-level function. |
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Move the file pointer in a file opened with a low-level file function. |
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Write a character string to a file opened with a low-level file function. |
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Return the number of bytes in the header of the current or specified table file. |