Re: Object/variable scope problems (Linux and Win comparison)
On 28 Feb., 13:39, Mark wrote:
[...]
The implementation is very similar both in Win and *NIX.
CControlClass incorporates CLoggerClass this way.
*LoggerObj is declared as private member of CControlClass.
(CLoggerClass *LoggerObj)
CControlClass::CControlClass()
{ readConfFile("somefile.conf"); }
int CControlClass::readConfFile(const char * somefile){
//do some parsing
LoggerObj=new CLoggerClass("some_log_file.log");
LoggerObj->writeLog(some_const_int,some_char_array_or_stringstream)
}
int CControlClass::functionOne()
{
//something
LoggerObj->writeLog(...,...)}
//main.cpp
int main(int argc, char** argv)
{
CControlClass *ControlObj=new CControlClass();
ControlObj->functionOne();
}
btw, this looks like a Java/C# programmer is trying to import his
programming style into C++. You know that there is no garbage
collection in C++ and that you should delete the things you created
with new, right? If not, stop immediately and get hold of a decent C++
book. Forcing a Java/C# programming style in C++ won't do you any
good. The languages are just too different.
In win environment, program runs really good.
On Linux (g++ 4.1) it compiles, it will write the log related to
readConfFile but when functionOne calls the Logger (called from main),
a private variable of CLoggerClass (needed to tailor detalization of
output) is not anymore referenced. That causes a segmentation fault.
I was able to recover from SEGFAULT, putting LoggerObj=new
CLoggerClass("some_log_file.log") into the constructor of
ControlClass... but it will not write anything when called by
functionOne,Two,Three... and when called by readConfFile, it will
write the log into the configuration file
Can you please explain what's the matter?
Sorry, I can't. Not with so little information. But you may want to
simplify your code so you can show a short and complete example of the
exact code that you tested and didn't work like intended. Chances are,
you did something wrong and looking for the bug in the wrong place.
Cheers!
SG