Here is some example code I read from some tutorial:
int main(int argc, char* argv[])
{
log4cpp::OstreamAppender* osAppender = new log4cpp::OstreamAppender("osAppender", &cout);
osAppender->setLayout(new log4cpp::BasicLayout());
log4cpp::Category& root = log4cpp::Category::getRoot();
root.addAppender(osAppender);
root.setPriority(log4cpp::Priority::DEBUG);
root.error("Hello log4cpp in a Error Message!");
root.warn("Hello log4cpp in a Warning Message!");
log4cpp::Category::shutdown();
getchar();
return 0;
}
Error report:
Unhandled exception at 0x76fe15de of log4cpp_Test.exe: 0xC0000005: Access violation wile reading 0x00000024
What might have caused the error ?
The code which you have posted is ok. It is compiled and run well.
Are you sure that you have no additional code beside that posted one? The problem might be caused by just few additional lines.
It looks like somewhere NULL pointer is dereferenced, which causes the access violation.
I think you run into this bug ... and it is from 2008.
Related
I'm trying to use QfileDialog (as a static fct) for the user to select and read a ".txt" file, as follow:
void VisOCMConfig::readNmbTiles()
{
QString m_findFile;
m_findFile = QFileDialog::getOpenFileName(0, tr("Open TextFile"),
QDir::homePath(), tr("Text files (*.txt)"));
QFile myfile(m_findFile);
if (!myfile.open(QIODevice::ReadOnly | QIODevice::Text))
return;
else
while (!myfile.atEnd())
{
m_scanPos = myfile.readLine();
m_nmbofLines++;
}
myfile.close();
qDebug() << "Scan Positions: (" << m_scanPos.size() << "): " << m_scanPos;
m_nmbofScan->setText(QString("#Tiles: %1").arg(m_nmbofLines));
}
Where m_scanPos is a QByteArray initialized in VisOCMConfig.h.
When I run the programm, It works correctly until a break occurs suddenly with the following message:
Unhandled exception at 0x000007FEFD5D7C8A (ole32.dll) in
VisOCMConfig.exe: 0xC0000005: Access violation reading location
0xFFFFFFFFFFFFFFFF
I read on other questions that it might be due to the use of null pointer but i'm still lost about it. Can you identify my mistake?
I've been having the same issue. Try using "DontUseNativeDialog" as a flag. I believe this solves the crash, but then you are left with a non-native dialog.
I have the same problem. Solution is also to use a non-native QFileDialog.
Actually it only appears in Debug mode. In Release mode evething is fine.
The same code is working under QT4.8. Somehow it is not when using QT5.6.
Those who downvoted this question (I upvoted it) are more than welcome to downvote also this my answer.
I have the same problem with Qt 5.2.1 - same exception in ole32.dll after using QFileDialog::getOpenFileName() - not immediately but after 10 - 60 seconds. It happens if I continue with application AND ALSO if do nothing after opening file, just wait some time.
Using "DontUseNativeDialog" as suggested by #aeson and #guest avoids this problem.
I hope this information can help others.
#MartinBonner I think the tag should be changed back to QFileDialog because the problem is clearly related to it
I had the same error - my application crashed in debug mode.
If you examine the call stack when this issue occurs, you notice that the issue is related to the NetworkItemFactory.dll component.
A similar problem is described here: Unhandled exception in marshal.cxx under VS2013
Microsoft fixed this, so the solution is to apply Microsoft's hotfix Windows6.1-KB2718841
I ran into a problem whereby my executable may receive an abort/retry/ignore dialog such as:
Debug Error!
Program: ...whatever.exe
R6010
- abort() has been called
I believe it is because I have an unhandled exception and I can replicate the problem with this simple program:
int _tmain(int argc, _TCHAR* argv[])
{
try
{
throw std::exception();
}
catch (std::logic_error& e)
{
}
std::cout << "Hello World!";
return 0;
}
Is my assumption correct (it is caused by an unhandled exception)? I have found plenty of examples online for the error but nothing that actually defines what the error code means.
This error only occurs in my debug build. My release build will just hang before crashing out (which is what I expect for the unhandled exception).
This happens if there's an assertion: assert( condition );.
Assertions are only checked/compiled in the debug build.
Unhandled exceptions make assertions internally, in order to allow the developer to interrupt and debug the program and to find the error.
In release build, the application crashes immediately.
If you remove or catch the exception, the error will not appear anymore.
I am writing a server application with sqlite3 and c++. My problem occurs in the following line: int connect = _sqlite3_open(database_sqlite_file, &db);
In the MSVC++ logs I get these notes:
Unhandled exception at 0x74ABCB49 in Fantasia_Database.exe: 0xC0000005: Access violation executing location 0x00000000.
Anyone know the source of this error, what am I doing wrong?
I'm using Visual Studio 2012 Express and I write in c++.
I have a rather weird problem with my code.
void CMap::loadMap(const std::string &MapName)
{
m_MapName = MapName; // This line is causing an error
loadMap();
}
While it compiles succesfully, it crashes on that line when I run it.
Unhandled exception at 0x003A10FC (msvcr110d.dll) in MyAdventure.exe: 0xC0000005: Access violation writing location 0xFEEEFEEE.
That's what it says. When i click Break, it directs me to that line in memcpy.asm
mov [edi],al ;U - write second byte to destination
CMap is a class which has
std::string m_MapName;
as it's member.
I've also tried to compile my code in Visual Studio 2010 Express and it works fine without any problems. I'd really want to use VS 2012 though, so I'd really like some help.
Thanks for any help.
Is there a way to see the explanatory string from an unhandled exception? I'm using Visual Studio 2012 Express and can't seem to find a way to see it.
When I run the following code:
#include <stdexcept>
int main(int argc, char* argv[])
{
throw std::runtime_error("warp core breach");
return 0;
}
all I get in the output window is this:
First-chance exception at 0x7652C41F in vstest.exe: Microsoft C++ exception: std::runtime_error at memory location 0x0015F6A4.
Unhandled exception at at 0x7652C41F in vstest.exe: Microsoft C++ exception: std::runtime_error at memory location 0x0015F6A4.
I would have expected the "warp core breach" message to be printed there. I have all options under Debugging->Output Window->General Output Settings set to On.
You'll get a window when the exception is thrown with the option to break/continue/ignore. Copy and paste the hex address this dialog reports, then click the break button. Now in a watch window, enter something like: (std::runtime_error*)(0x002cfbc8) into a cell in the first column.