Call a function in a shared library: Difference between revisions
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The example is using the standard library that is supplied with Regina REXX that contains a wide range of functions. |
The example is using the standard library that is supplied with Regina REXX that contains a wide range of functions. |
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<lang rexx>/*REXX pgm calls a function (systextscreensize) in a shared library (regutil).*/ |
<lang rexx>/*REXX pgm calls a function (systextscreensize) in a shared library (regutil).*/ |
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z=rxfuncadd('sysloadfuncs', "regutil", 'sysloadfuncs') |
z= rxfuncadd('sysloadfuncs', "regutil", 'sysloadfuncs') /*add a function lib.*/ |
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if z\==0 then do /*test the return cod*/ |
if z\==0 then do /*test the return cod*/ |
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say 'return code' z "from rxfuncadd" /*tell about bad RC. */ |
say 'return code' z "from rxfuncadd" /*tell about bad RC. */ |
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/* [↓] call a particular function. */ |
/* [↓] call a particular function. */ |
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y=systextscreensize() |
y= systextscreensize() /*Y now contains 2 numbers: rows cols */ |
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parse var y rows cols . /*obtain the two numeric words in Y. */ |
parse var y rows cols . /*obtain the two numeric words in Y. */ |
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say 'rows=' rows /*display the number of (terminal) rows*/ |
say 'rows=' rows /*display the number of (terminal) rows*/ |
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call SysDropFuncs /*clean up: make functions inaccessible*/ |
call SysDropFuncs /*clean up: make functions inaccessible*/ |
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/*stick a fork in it, we're all done. */</lang> |
/*stick a fork in it, we're all done. */</lang> |
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{{out|output|text= (which happens to reflect the program's author's particular screen size for the "DOS" window):}} |
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<pre> |
<pre> |
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rows= 62 |
rows= 62 |
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