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Ingy döt Net 2023-07-01 11:58:00 -04:00
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<span style="color: #000080;font-style:italic;">-- demo\rosetta\Bitmap_Read_an_image_through_a_pipe.exw</span>
<span style="color: #008080;">without</span> <span style="color: #008080;">js</span> <span style="color: #000080;font-style:italic;">-- file i/o, system_exec(), pipes[!!]</span>
<span style="color: #008080;">include</span> <span style="color: #000000;">builtins</span><span style="color: #0000FF;">\</span><span style="color: #000000;">pipeio</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
<span style="color: #008080;">include</span> <span style="color: #000000;">ppm</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span> <span style="color: #000080;font-style:italic;">-- read_ppm(), write_ppm()</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">pipes</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">pipes</span><span style="color: #0000FF;">[</span><span style="color: #000000;">PIPOUT</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">create_pipe</span><span style="color: #0000FF;">(</span><span style="color: #000000;">INHERIT_READ</span><span style="color: #0000FF;">)</span>
<span style="color: #000080;font-style:italic;">-- Create the child process, with replacement stdout. </span>
<span style="color: #004080;">string</span> <span style="color: #000000;">cmd</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"%s viewppm -load test.jpg"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">get_interpreter</span><span style="color: #0000FF;">(</span><span style="color: #004600;">true</span><span style="color: #0000FF;">)})</span>
<span style="color: #004080;">atom</span> <span style="color: #000000;">hProc</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">system_exec</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cmd</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">12</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">pipes</span><span style="color: #0000FF;">),</span>
<span style="color: #000000;">hPipe</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">pipes</span><span style="color: #0000FF;">[</span><span style="color: #000000;">PIPOUT</span><span style="color: #0000FF;">][</span><span style="color: #000000;">READ_PIPE</span><span style="color: #0000FF;">]</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">ppm</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">read_from_pipe</span><span style="color: #0000FF;">(</span><span style="color: #000000;">hPipe</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">hProc</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">while</span> <span style="color: #004600;">true</span> <span style="color: #008080;">do</span>
<span style="color: #004080;">object</span> <span style="color: #000000;">chunk</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">read_from_pipe</span><span style="color: #0000FF;">(</span><span style="color: #000000;">hPipe</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">hProc</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">chunk</span><span style="color: #0000FF;">=-</span><span style="color: #000000;">1</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #000000;">ppm</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">chunk</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
<span style="color: #000000;">pipes</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">close_handles</span><span style="color: #0000FF;">(</span><span style="color: #000000;">pipes</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">img</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">read_ppm</span><span style="color: #0000FF;">(</span><span style="color: #000000;">ppm</span><span style="color: #0000FF;">,</span><span style="color: #000000;">bText</span><span style="color: #0000FF;">:=</span><span style="color: #004600;">true</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">write_ppm</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"Lenapipe.ppm"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">img</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">else</span> <span style="color: #000080;font-style:italic;">-- or</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">fn</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">open</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"Lenapipe.ppm"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"wb"</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">,</span><span style="color: #000000;">ppm</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">close</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #0000FF;">?</span><span style="color: #008000;">"done"</span>
<span style="color: #0000FF;">{}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">wait_key</span><span style="color: #0000FF;">()</span>
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