File input/output: Difference between revisions
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m (Mortense moved page File IO to File input/output: Expansion.) |
m (Spelling/case, as in <http://en.wikipedia.org/wiki/Input/output>.) |
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<lang autohotkey>FileRead, var, input.txt |
<lang autohotkey>FileRead, var, input.txt |
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FileAppend, %var%, output.txt</lang> |
FileAppend, %var%, output.txt</lang> |
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Method 3: the file can be copied without |
Method 3: the file can be copied without I/O. |
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<lang autohotkey>FileCopy, input.txt, output.txt</lang> |
<lang autohotkey>FileCopy, input.txt, output.txt</lang> |
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Binary |
Binary I/O is possible with [http://www.autohotkey.com/forum/topic4604.html&highlight=binread this] library from Laszlo. |
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=={{header|AWK}}== |
=={{header|AWK}}== |
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It uses <code>fgetc</code> to read one character at a time. Each character is visited, even though there's nothing to do with it. Copying bigger blocks of data is much more efficient. |
It uses <code>fgetc</code> to read one character at a time. Each character is visited, even though there's nothing to do with it. Copying bigger blocks of data is much more efficient. |
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The following example addresses those issues. To avoid buffered |
The following example addresses those issues. To avoid buffered I/O, it uses ''open()'', ''read()'', ''write()'' and ''close()'', which are part of [[POSIX]]. |
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{{works with|POSIX}} |
{{works with|POSIX}} |
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}</lang> |
}</lang> |
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This version closes both files after without OS intervention |
This version closes both files after without OS intervention. |
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<lang java>import java.io.*; |
<lang java>import java.io.*; |
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In rexx, filename association is used rather than numeric stream numbers and explicit file opening is not required. |
In rexx, filename association is used rather than numeric stream numbers and explicit file opening is not required. |
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=== |
===Version 1=== |
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<lang rexx>/*REXX program to read a file and store the contents into an output file*/ |
<lang rexx>/*REXX program to read a file and store the contents into an output file*/ |
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end |
end |
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/*stick a fork in it, we're done.*/</lang> |
/*stick a fork in it, we're done.*/</lang> |
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=== |
===Version 2=== |
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<lang rexx>/*REXX program to read a file and store the contents into an output file*/ |
<lang rexx>/*REXX program to read a file and store the contents into an output file*/ |
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/*(same as the 1st example, but is faster because no intermediate step.)*/ |
/*(same as the 1st example, but is faster because no intermediate step.)*/ |
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/*stick a fork in it, we're done.*/</lang> |
/*stick a fork in it, we're done.*/</lang> |
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=== |
===Version 3=== |
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Note that this version is limited to files less than one million bytes (and/or possibly virtual memory). |
Note that this version is limited to files less than one million bytes (and/or possibly virtual memory). |
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<lang rexx>/*REXX program to read a file and write contents to an output file***** |
<lang rexx>/*REXX program to read a file and write contents to an output file***** |
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