CODEWITHSUNDEEP
c++visual-c++crashlog4cpp
Alex Wade
Alex Wade

Reputation: 747

Debug Assertion Fails When Trying to Write to Log4cpp Stream

I'm trying to enable logging with log4cpp in the following way.

class Foo
{
    private: 
        log4cpp::Appender* _logAppender;
        log4cpp::Layout* _logAppenderLayout;
}

Foo::Foo()
{
    _logAppender = new log4cpp::FileAppender("foo", "logs/bar.log"));
    _logAppenderLayout = new log4cpp::BasicLayout();
    _logAppender.setLayout(_logAppenderLayout);
    log4cpp::Category::getRoot().setPriority(log4cpp::Priority::DEBUG);
    log4cpp::Category::getRoot().addAppender(_logAppender);

    // Crash on line below.
    log4cpp::Category::getRoot().debugStream() << "test";
}

When I get to the line where I try to write "test" to the log, I get a crash that says "Debug Assertion Failed!" The assertion is in f:\dd\vctools\crt_bld_self_64_amd64\crt\src\write.c Line 67. The assert that fails is 

fh >= 0 && (unsigned)fh < (unsigned)_nhandle

I have created the logs directory and the bar.log file to make sure it exists. I have also confirmed that both my application and the library were built as 64-bit multithreaded debug DLLs. There was no 64 bit build in the log4cpp source, so I created one based on the 32-bit build configuration. I'm using the latest version of log4cpp.

Upvotes: 0

Views: 3410

Answers (2)

Alex InTechno
Alex InTechno

Reputation: 1261

Just discovered this question and tried to get this assertion. I have built log4cpp (ver 1.1) library and user1229080's test for Win32 and x64 platforms in MSVC2010 and have got no assertion.

I added few lines to get it compiled, and removed "logs" dir from the file path just to get rid of issues related to absent directories:

#include "stdafx.h"

#include <log4cpp/Category.hh>
#include <log4cpp/FileAppender.hh>
#include <log4cpp/OstreamAppender.hh>
#include <log4cpp/BasicLayout.hh>

class Foo
{
    private:
        log4cpp::Appender* _logAppender, *_conAppender;
        log4cpp::Layout* _logAppenderLayout;
    public:
        Foo();
};

Foo::Foo()
{
    _conAppender = new log4cpp::OstreamAppender("con", &std::cout);
    _logAppender = new log4cpp::FileAppender("foo", "bar.log");
    _logAppenderLayout = new log4cpp::BasicLayout();
    _logAppender->setLayout(_logAppenderLayout);

    log4cpp::Category::getRoot().setPriority(log4cpp::Priority::DEBUG);
    log4cpp::Category::getRoot().addAppender(_logAppender);
    log4cpp::Category::getRoot().addAppender(_conAppender);


    // Crash on line below. (but not in msvc2010)
    log4cpp::Category::getRoot().debugStream() << "test" << log4cpp::eol;
}

int main(int argc, char* argv[]) {
    Foo f;

    return 0;
}

Which version of visual c++ you encountered the assertion on?

Upvotes: 0

Heaven
Heaven

Reputation: 151

It is old post, but I guess solution for this problem may be useful for somebody.

Most probably you just forgot to create directory "logs" that is in your code.

This is the problem of closed stream: logger does not auto-create directories for your logs, so, no directory -> no file -> open file failed -> invalid file handler -> exception. You should create directories manually. Macros assertions and no more info is sad.

Upvotes: 1

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