问题
I am experiencing an unhandled exception within xutility
if (_Myproxy != 0)
{ // proxy allocated, drain it
_Lockit _Lock(_LOCK_DEBUG);
for (_Iterator_base12 **_Pnext = &_Myproxy->_Myfirstiter;
*_Pnext != 0; *_Pnext = (*_Pnext)->_Mynextiter)
(*_Pnext)->_Myproxy = 0; <------- unhandled exception here
_Myproxy->_Myfirstiter = 0;
}
I do not have control over xutility. This unhandled exception train stems from
std::string BinarySearchFile::readT(long filePointerLocation, long sizeOfData)
{
try{
if(binary_search_file){
std::string data;
binary_search_file.seekp(filePointerLocation);
binary_search_file.seekg(filePointerLocation);
binary_search_file.read(reinterpret_cast<char *>(&data), sizeOfData);
return data; <------- branch into xutility and subsequent unhandled exception
}else if(binary_search_file.fail()){
throw CustomException("Attempt to read attribute error");
}
}
catch(CustomException &custom_exception){ // Using custom exception class
std::cout << custom_exception.what() << std::endl;
}
}
Normally, the return would proceed to
std::string BinarySearchFile::read_data(long filePointerLocation, long sizeOfData){
return readT(filePointerLocation, sizeOfData);
}
And subsequently back to the original call
attributeValue = data_file->read_data(index, size);
What am I doing wrong?
回答1:
The data string is empty when you try to read into it. That will corrupt memory somewhere.
You should add data.resize(sizeOfData) to allocate space, and then read into its buffer
binary_search_file.read(&data[0], sizeOfData);
^^^
not into the string object itself.
来源：https://stackoverflow.com/questions/16038954/unhandled-exception-error