Mos*_*she 38 c++ exception-handling inputstream file-handling
是否可以使用文件打开的异常作为使用的替代方法.is_open()?
例如:
ifstream input;
try{
input.open("somefile.txt");
}catch(someException){
//Catch exception here
}
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如果是这样,那是什么类型的someException?
Kar*_*rlM 40
http://en.cppreference.com/w/cpp/io/basic_ios/exceptions
// ios::exceptions
#include <iostream>
#include <fstream>
using namespace std;
void do_something_with(char ch) {} // Process the character
int main () {
ifstream file;
file.exceptions ( ifstream::badbit ); // No need to check failbit
try {
file.open ("test.txt");
char ch;
while (file.get(ch)) do_something_with(ch);
// for line-oriented input use file.getline(s)
}
catch (const ifstream::failure& e) {
cout << "Exception opening/reading file";
}
file.close();
return 0;
}
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在Wandbox上运行的示例代码
编辑:通过const引用2145147捕获异常
编辑:从异常集中删除failbit.添加了URL以获得更好的答案