C++ 如何使用 fstream fstream::app 标志附加到文件似乎不起作用
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How to append to a file with fstream fstream::app flag seems not to work
提问by groovehunter
i simply want to write (append) to a logfile. I looked it up here:
http://www.cplusplus.com/reference/iostream/fstream/open/
我只是想写入（附加）到日志文件。我在这里查了一下：http:
//www.cplusplus.com/reference/iostream/fstream/open/
so this is what i did
所以这就是我所做的
#include <fstream>
fstream outfile;
//outfile.open("/tmp/debug.txt" ); // works, simply for writing
outfile.open("/tmp/debug.txt", fstream::app ); // does nothing
outfile << "START" << endl;
outfile.close();
回答by AProgrammer
fstream::app|fstream::outinstead of fstream::app. appdoesn't make sense without specifying out(one could think it should have implied out, but it doesn't).
fstream::app|fstream::out而不是fstream::app. app没有指定就没有意义out（人们可能认为它应该暗示out，但事实并非如此）。
