KDECore
KLibLoader Class Reference
#include <KLibLoader>

Detailed Description
The KLibLoader allows you to load libraries dynamically at runtime.Dependent libraries are loaded automatically.
KLibLoader follows the singleton pattern. You can not create multiple instances. Use self() to get a pointer to the loader.
- Deprecated:
- You have two other possibilites: KPluginLoader or KService::createInstance for plugins KLibrary for other libraries
- See also:
- KLibrary
Definition at line 53 of file klibloader.h.
Public Types | |
enum | ComponentLoadingError { ErrNoLibrary = 1, ErrNoFactory, ErrNoComponent, ErrServiceProvidesNoLibrary, ErrNoServiceFound } |
Public Member Functions | |
KPluginFactory * | factory (const QString &libname, QLibrary::LoadHints loadHint=0) |
QString | lastErrorMessage () const |
KLibrary * | library (const QString &libname, QLibrary::LoadHints loadHint=0) |
void | unloadLibrary (const QString &libname) |
Static Public Member Functions | |
template<typename T> | |
static T * | createInstance (const QString &libname, QObject *parent, const QStringList &args, int *error=0) |
template<typename T> | |
static T * | createInstance (const QString &libname, QObject *parent=0, const QVariantList &args=QVariantList(), int *error=0) |
template<typename T> | |
static T * | createInstance (const QString &keyword, const QString &libname, QObject *parent=0, const QVariantList &args=QVariantList(), int *error=0) |
static QString | errorString (int componentLoadingError) |
static QString | findLibrary (const QString &libname, const KComponentData &cData=KGlobal::mainComponent()) |
static KLibLoader * | self () |
Member Enumeration Documentation
This enum type defines the possible error cases that can happen when loading a component.
-
ErrNoLibrary
- the specified library could not be loaded. Use KLibLoader::lastErrorMessage for details. -
ErrNoFactory
- the library does not export a factory for creating components -
ErrNoComponent
- the factory does not support creating components of the specified type -
ErrServiceProvidesNoLibrary
- the specified service provides no shared library (when using KService) -
ErrNoServiceFound
- no service implementing the given servicetype and fullfilling the given constraint expression can be found (when using KServiceTypeTrader).
Definition at line 170 of file klibloader.h.
Member Function Documentation
static T* KLibLoader::createInstance | ( | const QString & | libname, | |
QObject * | parent, | |||
const QStringList & | args, | |||
int * | error = 0 | |||
) | [inline, static] |
- Deprecated:
- Use one of the other createInstance methods or KPluginLoader or KService::createInstance instead
Definition at line 241 of file klibloader.h.
static T* KLibLoader::createInstance | ( | const QString & | libname, | |
QObject * | parent = 0 , |
|||
const QVariantList & | args = QVariantList() , |
|||
int * | error = 0 | |||
) | [inline, static] |
Definition at line 229 of file klibloader.h.
static T* KLibLoader::createInstance | ( | const QString & | keyword, | |
const QString & | libname, | |||
QObject * | parent = 0 , |
|||
const QVariantList & | args = QVariantList() , |
|||
int * | error = 0 | |||
) | [inline, static] |
This template allows to load the specified library and ask the factory to create an instance of the given template type.
- Parameters:
-
libraryName The library to open parent The parent object (see QObject constructor) args A list of string arguments, passed to the factory and possibly to the component (see KPluginFactory) error
- Returns:
- A pointer to the newly created object or a null pointer if the factory was unable to create an object of the given type.
Definition at line 197 of file klibloader.h.
QString KLibLoader::errorString | ( | int | componentLoadingError | ) | [static] |
Returns a translated error message for componentLoadingError
.
- Parameters:
-
componentLoadingError the error code, as returned in the "error" output parameter of createInstance.
Definition at line 142 of file klibloader.cpp.
KPluginFactory * KLibLoader::factory | ( | const QString & | libname, | |
QLibrary::LoadHints | loadHint = 0 | |||
) |
Loads and initializes a library.
Loading a library multiple times is handled gracefully.
This is a convenience function that returns the factory immediately
- Parameters:
-
libname This is the library name without extension. Usually that is something like "libkspread". The function will then search for a file named "libkspread.la" in the KDE library paths. The *.la files are created by libtool and contain important information especially about the libraries dependencies on other shared libs. Loading a "libfoo.so" could not solve the dependencies problem.
- Returns:
- the KPluginFactory, or 0 if the library does not exist or it does not have a factory
- See also:
- library
Definition at line 127 of file klibloader.cpp.
QString KLibLoader::findLibrary | ( | const QString & | libname, | |
const KComponentData & | cData = KGlobal::mainComponent() | |||
) | [static] |
Helper method which looks for a library in the standard paths ("module" and "lib" resources).
Made public for code that doesn't use KLibLoader itself, but still wants to open modules.
- Parameters:
-
libname of the library. If it is not a path, the function searches in the "module" and "lib" resources. If there is no extension, ".la" will be appended. cData a KComponentData used to get the standard paths
Definition at line 84 of file klibloader.cpp.
QString KLibLoader::lastErrorMessage | ( | ) | const |
Returns an error message that can be useful to debug the problem.
Returns QString() if the last call to library() was successful. You can call this function more than once. The error message is only reset by a new call to library().
- Returns:
- the last error message, or QString() if there was no error
Definition at line 118 of file klibloader.cpp.
Loads and initializes a library.
Loading a library multiple times is handled gracefully.
- Parameters:
-
libname This is the library name without extension. Usually that is something like "libkspread". The function will then search for a file named "libkspread.la" in the KDE library paths. The *.la files are created by libtool and contain important information especially about the libraries dependencies on other shared libs. Loading a "libfoo.so" could not solve the dependencies problem.
- Returns:
- KLibrary is invalid (0) when the library couldn't be dlopened. in such a case you can retrieve the error message by calling KLibLoader::lastErrorMessage()
- See also:
- factory
Definition at line 89 of file klibloader.cpp.
KLibLoader * KLibLoader::self | ( | ) | [static] |
Returns a pointer to the factory.
Use this function to get an instance of KLibLoader.
- Returns:
- a pointer to the loader. If no loader exists until now then one is created.
Definition at line 46 of file klibloader.cpp.
void KLibLoader::unloadLibrary | ( | const QString & | libname | ) |
Unloads the library with the given name.
- Parameters:
-
libname This is the library name without extension. Usually that is something like "libkspread". The function will then search for a file named "libkspread.la" in the KDE library paths. The *.la files are created by libtool and contain important information especially about the libraries dependencies on other shared libs. Loading a "libfoo.so" could not solve the dependencies problem.
Definition at line 123 of file klibloader.cpp.
The documentation for this class was generated from the following files: