Mixing
Unable to refer to methods in another plugin
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I have a method in classA present in PluginA, I am able to compile and access this method in all the classes inside the same plugin.
When I try to access the method from another pluginB I get below error. Although I am able to refer and print enums in pluginA from pluginB.
pluginspluginBmocksclassB.cpp:61: error: undefined reference to namespaceA::classA::methodA(int)
collect2.exe:-1: error: error: ld returned 1 exit status
Any guidance is much appreciated.
- QT: 4.8
- IDE: QT creator 4.4.0
- OS: Windows 10
c++ qt qt4
asked Jan 3 at 9:03
RavishaRavisha
1,35462959
add a comment |
I have a method in classA present in PluginA, I am able to compile and access this method in all the classes inside the same plugin.
When I try to access the method from another pluginB I get below error. Although I am able to refer and print enums in pluginA from pluginB.
pluginspluginBmocksclassB.cpp:61: error: undefined reference to namespaceA::classA::methodA(int)
collect2.exe:-1: error: error: ld returned 1 exit status
Any guidance is much appreciated.
- QT: 4.8
- IDE: QT creator 4.4.0
- OS: Windows 10
c++ qt qt4
asked Jan 3 at 9:03
RavishaRavisha
1,35462959
Do you mean you can print enums fromPluginAfrompluginB?
– Fantastic Mr Fox
Jan 3 at 9:14
yes. sorry for the typo. edited the same
– Ravisha
Jan 3 at 10:30
add a comment |
I have a method in classA present in PluginA, I am able to compile and access this method in all the classes inside the same plugin.
When I try to access the method from another pluginB I get below error. Although I am able to refer and print enums in pluginA from pluginB.
pluginspluginBmocksclassB.cpp:61: error: undefined reference to namespaceA::classA::methodA(int)
collect2.exe:-1: error: error: ld returned 1 exit status
Any guidance is much appreciated.
- QT: 4.8
- IDE: QT creator 4.4.0
- OS: Windows 10
c++ qt qt4
asked Jan 3 at 9:03
RavishaRavisha
1,35462959
I have a method in classA present in PluginA, I am able to compile and access this method in all the classes inside the same plugin.
When I try to access the method from another pluginB I get below error. Although I am able to refer and print enums in pluginA from pluginB.
pluginspluginBmocksclassB.cpp:61: error: undefined reference to namespaceA::classA::methodA(int)
collect2.exe:-1: error: error: ld returned 1 exit status
Any guidance is much appreciated.
- QT: 4.8
- IDE: QT creator 4.4.0
- OS: Windows 10
c++ qt qt4
c++ qt qt4
asked Jan 3 at 9:03
RavishaRavisha
1,35462959
asked Jan 3 at 9:03
RavishaRavisha
1,35462959
edited Jan 3 at 10:30
Ravisha
asked Jan 3 at 9:03
RavishaRavisha
1,35462959
asked Jan 3 at 9:03
RavishaRavisha
1,35462959
asked Jan 3 at 9:03
RavishaRavisha
1,35462959
1,35462959
Do you mean you can print enums fromPluginAfrompluginB?
– Fantastic Mr Fox
Jan 3 at 9:14
yes. sorry for the typo. edited the same
– Ravisha
Jan 3 at 10:30
add a comment |
Do you mean you can print enums fromPluginAfrompluginB?
– Fantastic Mr Fox
Jan 3 at 9:14
yes. sorry for the typo. edited the same
– Ravisha
Jan 3 at 10:30
Do you mean you can print enums from
PluginA from pluginB?– Fantastic Mr Fox
Jan 3 at 9:14
Do you mean you can print enums from
PluginA from pluginB?– Fantastic Mr Fox
Jan 3 at 9:14
yes. sorry for the typo. edited the same
– Ravisha
Jan 3 at 10:30
yes. sorry for the typo. edited the same
– Ravisha
Jan 3 at 10:30
add a comment |
1 Answer
1
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oldest
votes
If plugins are independent, you cannot directly call functions across them.
In this case, if you do need to call a function across plugins, you need to use GetProcAddress to retrieve the address of a particular function. However this only works for free functions declared with extern "C":
// Somewher in pluginA
extern "C" void functionA() {}
// Somewhere in pluginB
using MyFunc = void(void);
MyFunc *pointer = GetProcAddress(module,TEXT("functionA"));
if (pointer)
pointer(); // call "functionA()";
else
qWarning("functionA() not found, pluginA not loaded");
Note that you may want to use EnumProcessModulesEx() to search in all possible loaded module.
If pluginB is linked to pluginA at compile time, that means that you should have LIBS += -lpluginA in the .pro file of your pluginB.
Also make sure you are using __declspec( dllexport ) and __declspec( dllimport ) on the classA declaration.
If you used Qt Creator wizard to generate your pluginA project, you should already have something like this in your code:
#ifdef _MSC_VER
#if defined(LIBRARY_A)
#define LIBRARY_A_EXPORT __declspec(dllexport)
#else
#define LIBRARY_A_EXPORT __declspec(dllimport)
#endif
#else
#define LIBRARY_A_EXPORT
#endif
Just make sure that classA definition looks like: class LIBRARY_A_EXPORT classA;
answered Jan 3 at 9:58
Benjamin TBenjamin T
5,2931127
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
If plugins are independent, you cannot directly call functions across them.
In this case, if you do need to call a function across plugins, you need to use GetProcAddress to retrieve the address of a particular function. However this only works for free functions declared with extern "C":
// Somewher in pluginA
extern "C" void functionA() {}
// Somewhere in pluginB
using MyFunc = void(void);
MyFunc *pointer = GetProcAddress(module,TEXT("functionA"));
if (pointer)
pointer(); // call "functionA()";
else
qWarning("functionA() not found, pluginA not loaded");
Note that you may want to use EnumProcessModulesEx() to search in all possible loaded module.
If pluginB is linked to pluginA at compile time, that means that you should have LIBS += -lpluginA in the .pro file of your pluginB.
Also make sure you are using __declspec( dllexport ) and __declspec( dllimport ) on the classA declaration.
If you used Qt Creator wizard to generate your pluginA project, you should already have something like this in your code:
#ifdef _MSC_VER
#if defined(LIBRARY_A)
#define LIBRARY_A_EXPORT __declspec(dllexport)
#else
#define LIBRARY_A_EXPORT __declspec(dllimport)
#endif
#else
#define LIBRARY_A_EXPORT
#endif
Just make sure that classA definition looks like: class LIBRARY_A_EXPORT classA;
answered Jan 3 at 9:58
Benjamin TBenjamin T
5,2931127
add a comment |
If plugins are independent, you cannot directly call functions across them.
In this case, if you do need to call a function across plugins, you need to use GetProcAddress to retrieve the address of a particular function. However this only works for free functions declared with extern "C":
// Somewher in pluginA
extern "C" void functionA() {}
// Somewhere in pluginB
using MyFunc = void(void);
MyFunc *pointer = GetProcAddress(module,TEXT("functionA"));
if (pointer)
pointer(); // call "functionA()";
else
qWarning("functionA() not found, pluginA not loaded");
Note that you may want to use EnumProcessModulesEx() to search in all possible loaded module.
If pluginB is linked to pluginA at compile time, that means that you should have LIBS += -lpluginA in the .pro file of your pluginB.
Also make sure you are using __declspec( dllexport ) and __declspec( dllimport ) on the classA declaration.
If you used Qt Creator wizard to generate your pluginA project, you should already have something like this in your code:
#ifdef _MSC_VER
#if defined(LIBRARY_A)
#define LIBRARY_A_EXPORT __declspec(dllexport)
#else
#define LIBRARY_A_EXPORT __declspec(dllimport)
#endif
#else
#define LIBRARY_A_EXPORT
#endif
Just make sure that classA definition looks like: class LIBRARY_A_EXPORT classA;
answered Jan 3 at 9:58
Benjamin TBenjamin T
5,2931127
add a comment |
If plugins are independent, you cannot directly call functions across them.
In this case, if you do need to call a function across plugins, you need to use GetProcAddress to retrieve the address of a particular function. However this only works for free functions declared with extern "C":
// Somewher in pluginA
extern "C" void functionA() {}
// Somewhere in pluginB
using MyFunc = void(void);
MyFunc *pointer = GetProcAddress(module,TEXT("functionA"));
if (pointer)
pointer(); // call "functionA()";
else
qWarning("functionA() not found, pluginA not loaded");
Note that you may want to use EnumProcessModulesEx() to search in all possible loaded module.
If pluginB is linked to pluginA at compile time, that means that you should have LIBS += -lpluginA in the .pro file of your pluginB.
Also make sure you are using __declspec( dllexport ) and __declspec( dllimport ) on the classA declaration.
If you used Qt Creator wizard to generate your pluginA project, you should already have something like this in your code:
#ifdef _MSC_VER
#if defined(LIBRARY_A)
#define LIBRARY_A_EXPORT __declspec(dllexport)
#else
#define LIBRARY_A_EXPORT __declspec(dllimport)
#endif
#else
#define LIBRARY_A_EXPORT
#endif
Just make sure that classA definition looks like: class LIBRARY_A_EXPORT classA;
answered Jan 3 at 9:58
Benjamin TBenjamin T
5,2931127
If plugins are independent, you cannot directly call functions across them.
In this case, if you do need to call a function across plugins, you need to use GetProcAddress to retrieve the address of a particular function. However this only works for free functions declared with extern "C":
// Somewher in pluginA
extern "C" void functionA() {}
// Somewhere in pluginB
using MyFunc = void(void);
MyFunc *pointer = GetProcAddress(module,TEXT("functionA"));
if (pointer)
pointer(); // call "functionA()";
else
qWarning("functionA() not found, pluginA not loaded");
Note that you may want to use EnumProcessModulesEx() to search in all possible loaded module.
If pluginB is linked to pluginA at compile time, that means that you should have LIBS += -lpluginA in the .pro file of your pluginB.
Also make sure you are using __declspec( dllexport ) and __declspec( dllimport ) on the classA declaration.
If you used Qt Creator wizard to generate your pluginA project, you should already have something like this in your code:
#ifdef _MSC_VER
#if defined(LIBRARY_A)
#define LIBRARY_A_EXPORT __declspec(dllexport)
#else
#define LIBRARY_A_EXPORT __declspec(dllimport)
#endif
#else
#define LIBRARY_A_EXPORT
#endif
Just make sure that classA definition looks like: class LIBRARY_A_EXPORT classA;
answered Jan 3 at 9:58
Benjamin TBenjamin T
5,2931127
answered Jan 3 at 9:58
Benjamin TBenjamin T
5,2931127
answered Jan 3 at 9:58
Benjamin TBenjamin T
5,2931127
answered Jan 3 at 9:58
Benjamin TBenjamin T
5,2931127
5,2931127
add a comment |
add a comment |
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Do you mean you can print enums from
PluginAfrompluginB?– Fantastic Mr Fox
Jan 3 at 9:14
yes. sorry for the typo. edited the same
– Ravisha
Jan 3 at 10:30