# Poco

# class SharedLibrary

Library: Foundation
Package: SharedLibrary
Header: Poco/SharedLibrary.h

## Description

The SharedLibrary class dynamically loads shared libraries at run-time.

## Inheritance

Direct Base Classes: SharedLibraryImpl

All Base Classes: SharedLibraryImpl

## Member Summary

Member Functions: getPath, getSymbol, hasSymbol, isLoaded, load, suffix, unload

## Enumerations

### Flags

SHLIB_GLOBAL = 1

On platforms that use dlopen(), use RTLD_GLOBAL. This is the default if no flags are given.

This flag is ignored on platforms that do not use dlopen().

SHLIB_LOCAL = 2

On platforms that use dlopen(), use RTLD_LOCAL instead of RTLD_GLOBAL.

Note that if this flag is specified, RTTI (including dynamic_cast and throw) will not work for types defined in the shared library with GCC and possibly other compilers as well. See http://gcc.gnu.org/faq.html#dso for more information.

This flag is ignored on platforms that do not use dlopen().

## Constructors

### SharedLibrary

SharedLibrary();

Creates a SharedLibrary object.

### SharedLibrary

SharedLibrary(
const std::string & path
);

Creates a SharedLibrary object and loads a library from the given path.

### SharedLibrary

SharedLibrary(
const std::string & path,
int flags
);

Creates a SharedLibrary object and loads a library from the given path, using the given flags. See the Flags enumeration for valid values.

## Destructor

### ~SharedLibrary

virtual ~SharedLibrary();

Destroys the SharedLibrary. The actual library remains loaded.

## Member Functions

### getPath

const std::string & getPath() const;

Returns the path of the library, as specified in a call to load() or the constructor.

### getSymbol

void * getSymbol(
const std::string & name
);

Returns the address of the symbol with the given name. For functions, this is the entry point of the function. Throws a NotFoundException if the symbol does not exist.

### hasSymbol

bool hasSymbol(
const std::string & name
);

Returns true if and only if the loaded library contains a symbol with the given name.

### isLoaded

bool isLoaded() const;

Returns true if and only if a library has been loaded.

### load

void load(
const std::string & path
);

Loads a shared library from the given path. Throws a LibraryAlreadyLoadedException if a library has already been loaded. Throws a LibraryLoadException if the library cannot be loaded.

### load

void load(
const std::string & path,
int flags
);

Loads a shared library from the given path, using the given flags. See the Flags enumeration for valid values. Throws a LibraryAlreadyLoadedException if a library has already been loaded. Throws a LibraryLoadException if the library cannot be loaded.

### suffix

static std::string suffix();

Returns the platform-specific filename suffix for shared libraries (including the period). In debug mode, the suffix also includes a "d" to specify the debug version of a library.

### unload

void unload();

Unloads a shared library.