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Bitmap/Read an image through a pipe: Difference between revisions

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Bitmap/Read an image through a pipe (view source)

Revision as of 09:48, 8 November 2021

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Uses the demo\rosetta\viewppm.exw utility to accomplish this task.<br>
The returned data is raw binary, so you can either write it direct or chuck it through read_ppm/write_ppm.
<!--<lang Phix>(notonline)-->
<langspan Phixstyle="color: #000080;font-style:italic;">-- demo\rosetta\Bitmap_Read_an_image_through_a_pipe.exw</span>
requires("0.8.4")
<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>
include builtins\pipeio.e
<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>
include ppm.e -- read_ppm(), write_ppm()
<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>
 
sequence pipes = repeat(0,3)
<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>
pipes[PIPOUT] = create_pipe(INHERIT_READ)
<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>
string cmd = sprintf("%s viewppm -load test.jpg",{get_interpreter(true)})
<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>
atom hProc = system_exec(cmd, 12, pipes),
<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>
hPipe = pipes[PIPOUT][READ_PIPE]
<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>
 
string ppm = read_from_pipe(hPipe, hProc)
<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>
while true do
<span style="color: #008080;">while</span> <span style="color: #004600;">true</span> <span style="color: #008080;">do</span>
object chunk = read_from_pipe(hPipe, hProc)
<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>
if chunk=-1 then exit end if
<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>
ppm &= chunk
<span style="color: #000000;">ppm</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">chunk</span>
end while
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
 
pipes = close_handles(pipes)
<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>
 
if 0 then
<span style="color: #008080;">if</span> <span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
sequence img = read_ppm(ppm,bText:=true)
<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>
write_ppm("Lenapipe.ppm", img)
<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>
else -- or
<span style="color: #008080;">else</span> <span style="color: #000080;font-style:italic;">-- or</span>
integer fn = open("Lenapipe.ppm","wb")
<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>
puts(fn,ppm)
<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>
close(fn)
<span style="color: #7060A8;">close</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">)</span>
end if</lang>▼
<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>
▲end if<!--</lang>-->
 
=={{header|PicoLisp}}==
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