f. write()
Description:
Write a string or a sequence into a file.
Syntax:
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f.write(s) |
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f.write(A) |
Write A, the sequence of strings, to file f; each member occupies one row. |
Note:
The function writes string s or the sequence of strings A to file f. By default, the original file f will got overwritten, meaning contents in f will be first cleared and new contents are written.
Parameter:
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f |
A file object, which can be a data file of txt, csv, btx or xls format. |
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s |
A string or BLOB value. |
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A |
A sequence of strings. |
Option:
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@a |
Append data into a file, instead of overwriting it. If the file has contents before appending, then start a new line (with carriage return) to append. |
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@b |
Write as a binary file; in this case parameter s is a BLOB value. |
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@w |
Use Windows-style \r\n line break; by default, the line break is specified by OS. |
Example:
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A |
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1 |
=file("D:/tmp.txt") |
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2 |
>A1.write("China") |
Overwrite tmp.txt and write string China to it:
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3 |
>A1.write@a("Chinese") |
Use @a option to append string Chinese to tmp.txt:
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4 |
=["China","America","England "] |
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5 |
>A1.write(A4) |
Write A4’s string sequence to tmp.txt:
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6 |
>A1.write(string(now())+":start") |
Simulate to compose a log using write@a function.
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7 |
>A1.write@a(string(now())+":end") |
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8 |
>A1.write@a(string(now())+":startPrint") |
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9 |
>A1.write@a(string(now())+":endPrint") |
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10 |
=file("D:/test.btx").read@b() |
Read data from a binary file and return a BLOB value. |
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11 |
=file("D:/result.btx").write@b(A10) |
Generate result.btx using binary format data. |
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12 |
=file("D:/employee.txt").write@w(A4) |
Use \r\n, the Windows-style line break. |
Related function: