我的代码在捕获块中处理了正确的 eof 后到达 eof 时会引发 basic_ios::clear ?

My code raise basic_ios::clear when it reach eof though after proper eof handled in catch block?

本文关键字：eof basic clear 代码 ios 处理 我的      更新时间：2023-10-16

我的代码在到达 eof 时设置 std：：failbit 并抛出异常 如何跳过 EOF 异常

在 catch 块中，我检查并跳过异常是否是因为 eof 但它不好。

请建议如何在下面的代码中跳过 EOF 异常

std::ifstream in
std::string strRead;
in.exceptions ( std::ifstream::failbit | std::ifstream::badbit );
try
{
while (getline( in,strRead))
{
//reading the file
}
catch(std::ifstream::failure & exce)
{
if(! in.eof())   // skip if exception because of eof but its not working?
{
cout<<exce.what()<<endl;
return false;
}

}
catch(...)
{
cout("Unknow  exception ");
return false;
}

经过私下讨论，我们设法为他的问题找到了解决方案：当达到 eof 时，getline(in, strRead)会将故障位设置为 1(正常行为(，他不希望这种情况发生。我们同意使用其他方法来读取文件的内容：

std::ifstream in(*filename*); // replace *filename* with actual file name.
// Check if file opened successfully.
if(!in.is_open()) {
std::cout<<"could not open file"<<std::endl;
return false;
}
in.seekg(0, std::ios::end);
std::string strRead;
// Allocate space for file content.
try {
strRead.reserve(static_cast<unsigned>(in.tellg()));
} catch( const std::length_error &le) {
std::cout<<"could not reserve space for file"<<le.what()<<std::endl;
return false;
} catch(const std::bad_alloc &bae) {
std::cout<<"bad alloc occurred for file content"<<bae.what()<<std::endl;
return false;
} catch(...) {
std::cout<<"other exception occurred while reserving space for file content"<<std::endl;
return false;
}
in.seekg(0, std::ios::beg);
// Put the content in strRead.
strRead.assign(std::istreambuf_iterator<char>(in),
std::istreambuf_iterator<char>());
// Check for errors during reading.
if(in.bad()) {
std::cout<<"error while reading file"<<std::endl;
return false;
}
return true;

禁用故障位将是最好的方法，否则每次在使用 getline(( 时都会收到此异常

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