std::ofstream : Writing to a file using append and out flags - c++

Question

Below is a simple class which attempts to write an integer to a file. The mode of writing the file is to append characters at the end of the file (In this mode, file should be created if it doesn't exist)
#include <iostream>
#include <fstream>
class TestFileStream
{
private:
std::ofstream* _myFileStream;
bool isFileOpen;
public:
TestFileStream():isFileOpen(false)
{
_myFileStream = new std::ofstream("TestFile.txt", std::ios_base::out | std::ios_base::app );
isFileOpen = _myFileStream->is_open();
if( !isFileOpen )
{
std::cout << "Unable to open log file" << std::endl;
std::cout << "Good State: " << _myFileStream->good() <<std::endl;
std::cout << "Eof State: " << _myFileStream->eof() <<std::endl;
std::cout << "Fail State: " << _myFileStream->fail() <<std::endl;
std::cout << "Bad State: " << _myFileStream->bad() <<std::endl;
}
else
{
std::cout << "Opened log file" << std::endl;
}
}
~TestFileStream()
{
_myFileStream->close();
delete _myFileStream;
_myFileStream = nullptr;
}
void WriteFile( unsigned number )
{
if ( isFileOpen )
{
(*_myFileStream) << "Number: " << number << std::endl;
}
}
};
int main()
{
// Number of iterations can be multiple.
// For testing purpose, only 1 loop iteration executes
for( unsigned iter = 1; iter != 2; ++iter )
{
TestFileStream fileWriteObj;
fileWriteObj.WriteFile( 100+iter );
}
return 0;
}
When I execute the above code, I get following log output:
Unable to open log file
Good State: 0
Eof State: 0
Fail State: 1
Bad State: 0
This seems like trivial task, but I am not able to find out whats causing the failure. Note that this question is most likely related to the following question

Answer 1

Just to summarize the comments, there is nothing wrong about the code you posted (apart from the rather unconventional new ostream ;) )
Note however that opening files may fail for a number of reasons (Permissions, file in use, disk unavailable, the file does not exist, the file exists...). That is why you must always test it.
If you tried to run the above code in an online emulator, then chances are file IO is disabled. Which would explain why you get that the streams fail-bit is set.