Call a function in a shared library: Difference between revisions
Call a function in a shared library (view source)
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Show how to call a function in a shared library (without dynamically linking to it at compile-time). In particular, show how to call the shared library function if the library is available, otherwise use an internal equivalent function.
This is a special case of [[Call foreign language function|calling a foreign language function]] where the focus is close to the [https://en.wikipedia.org/wiki/Application_binary_interface ABI] level and not at the normal API level.
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dllclient.ahk
<syntaxhighlight lang="autohotkey">Msgbox, hello from client</syntaxhighlight>
=={{header|BaCon}}==▼
▲==={{header|BaCon}}===
<syntaxhighlight lang="qbasic">' Call a dynamic library function
PROTO j0
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prompt$ ./calllib
0.765198</pre>
▲=={{header|BBC BASIC}}==
==={{header|BBC BASIC}}===
{{works with|BBC BASIC for Windows}}
The following shared libraries are automatically available: ADVAPI32.DLL, COMCTL32.DLL, COMDLG32.DLL, GDI32.DLL, KERNEL32.DLL, SHELL32.DLL, USER32.DLL and WINMM.DLL.
<syntaxhighlight lang="bbcbasic"> SYS "MessageBox", @hwnd%, "This is a test message", 0, 0
</syntaxhighlight>
=={{header|C}}==
{{works with|POSIX|.1-2001}}
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end;
end;</syntaxhighlight>
=={{header|Ecstasy}}==
Ecstasy was designed around software containers and a strong security model. As such, Ecstasy does not have an FFI, and Ecstasy code cannot direcly access operating system or other foreign functions. More specifically, code running within an Ecstasy container cannot call foreign functions; any such required capabilities must be implemented outside of Ecstasy (for example, in C) and then <i>injected</i> into an Ecstasy container.
=={{header|Forth}}==
===GNU Forth 0.7.9 on Linux===
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Print "Press any key to quit"
Sleep</syntaxhighlight>
=={{header|FutureBasic}}==
Use GameplayKit framework to quickly generate random integers.
<syntaxhighlight lang="futurebasic">
include "tlbx GameplayKit.incl"
UInt64 randomInteger
NSUInteger i
for i = 1 to 20
randomInteger = fn GKLinearCongruentialRandomSourceSeed( fn GKLinearCongruentialRandomSourceInit )
print randomInteger
next
HandleEvents
</syntaxhighlight>
=={{header|Go}}==
{{trans|C}}
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> cfloor( 2.3 );
2.</syntaxhighlight>
=={{header|Lambdatalk}}==
Lambdatalk works in a wiki, lambdatank, hosted by any web browser coming with Javascript. Javascript has no native tools dealing with big numbers. Jonas Raoni Soares Silva has built a smart JS library, http://jsfromhell.com/classes/bignumber, which can be loaded in a wiki page, so called "lib_BN". Obviously interfaces must be built, for instance the BN.* operator multiplying two big numbers:.
<syntaxhighlight lang="scheme">
{script
LAMBDATALK.DICT['BN.*'] = function(){
var args = arguments[0].split(' '),
a = new BigNumber( args[0], BN_DEC ),
b = new BigNumber( args[1], BN_DEC );
return a.multiply( b )
};
</syntaxhighlight>
The lib_BN library can be loaded in any other wiki page via a {require lib_BN} expression and the BN.* primitive can be used this way:
<syntaxhighlight lang="scheme">
{BN.* 123456789123456789123456789 123456789123456789123456789}
-> 15241578780673678546105778281054720515622620750190521
to be compared with the "standard" lambdatalk builtin * operator
{* 123456789123456789123456789 123456789123456789123456789}
-> 1.524157878067368e+52
</syntaxhighlight>
=={{header|Mathematica}}/{{header|Wolfram Language}}==
This works on windows and on linux/mac too (through Mono)
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cols= 96
</pre>
=={{header|RPL}}==
There is no library concept in RPL. However, in 1990, Jan Christiaan van Winkel proposed to the RPL community a way to get something close.
Assuming the programs frequently needed are stored in a specific directory named <code>MyLib</code> located at root directory, the following program, also located at the root directory, can be invoked by any program to access one of the library features.
{{works with|Halcyon Calc|4.2.7}}
{| class="wikitable"
! RPL code
! Comment
|-
|
≪
PATH ➜ owd
≪ HOME MyLib RCL
1 owd SIZE '''FOR''' i
owd i GET EVAL '''NEXT'''
≫ EVAL
≫ ''''CALL'''' STO
|
'''CALL''' ''( 'Program_name' -- depending on call )''
save the old directory
push the library routine on the stack
now go back to the old directory
step by step
run the library routine
|}
{{in}}
<pre>
97 'PRIM?' CALL
</pre>
{{out}}
<pre>
1: 1
</pre>
=={{header|Ruby}}==
This script uses Fiddle from Ruby's standard library to open <code>fakeimglib.so</code> from the [[#C|C example]].
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end
exit status</syntaxhighlight>
=={{header|Rust}}==
The standard library does not provide a way to load dynamic libraries. Without using third-party libraries, we must use the FFI to call the relevant C functions directly.
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{{trans|C}}
An embedded program so we can ask the C host to call the shared library function for us.
<syntaxhighlight lang="
var RTLD_LAZY = 1
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<br>
Finally, we embed the Wren script in the following C program, compile and run it:
<syntaxhighlight lang="c">/* gcc
#include <stdio.h>
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WrenVM* vm = wrenNewVM(&config);
const char* module = "main";
const char* fileName = "
char *script = readFile(fileName);
WrenInterpretResult result = wrenInterpret(vm, module, script);
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Same as C example depending on whether fakeimglib.so is present in the current directory or not.
</pre>
=={{header|X86-64 Assembly}}==
===UASM 2.52===
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and it "just works" as all objects are "the same" whether statically or dynamically linked.
{{omit from|Batch File|Except for rundll32.exe (which is rather limited) there is no way of calling an external function}}
{{omit from|EasyLang|Libraries do not exist in EasyLang}}
{{omit from|GUISS}}
{{omit from|M4}}
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