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I have written some code. During run time it gives me this error
vARubberBand is a class and QgsMapCanvas is also a class.Code:qgis: symbol lookup error: /usr/lib/qgis/libqgis_plugin_va.so: undefined symbol: _ZN12vARubberBandC1EP12QgsMapCanvas
i am using a object of vARubberBand in another class x inheriting from QgsMapCanvas. Code looks clean to me, no warning at compile time but at runtime this error is presented.
Help required to sort it out.
regards
quickNitin
Check the spelling and types of function parameters.
C++ overloading means that if you get the types even a little bit wrong, you get the wrong overloaded name generated compared to the one the library provides.
thanks salem, i found in constructor i made a spelling mistake.
yesterday, i did corrections in code but agauin today found ,it is representing me with same error. Also i have a piece of code working on my machine . When i took that code to othe place and compiled it gave me similar error at runtime.
I definitely needs some light thrown on this issue. What causes such symbol look up error in directory?
Can you be clear about whether this is a compile-time, link-time or run-time error.
If you're linking with external libraries, check which versions you have.
Post exact error messages where possible.
it is run time error which as per my understanding happening when dynamically linking to a library. Exact error is
[ERROR]
qgis: symbol lookup error: /usr/lib/qgis/libqgis_plugin_va.so: undefined symbol: _ZN12vARubberBandC1EP12QgsMapCanvas
[/ERROR]
Scenario is like this.
I am working on open source gis QGis. For this i am writing a plugin. During compilation no warnings are issued. Application starts well. But as i do the event which bring control to my code it results in this error.
What has becoming more frustrating is ,another plugin which was runnning well when i added to other machine resulted in similar error.
i had figured out because of what error is thee but i dont know the answer.
It slike that i am declaring a new class and proving implementation of it separate file. Whenever i want to create object of this type i am getting this error. If i comment out object creation everything falls in place. I think i have to mention somewhere this file may be in makefile but i am unable to find out.
I am looking for guidance here. Above statement is an observation through trail and error method.
If the function is being compiled into a library, then you may need to "install" the updated library in some way - say move it to /lib rather than leave it in the build directory.
Check the makefile for say "make install" which should copy the library to it's proper run-time location.