std::fstream 不创建文件
我正在尝试将 std::fstream 用于 io to file，如果文件不存在，我想创建该文件.
I am trying to use std::fstream for io to file, and I want to create the file if it doesn't already exist.
std::fstream my_stream
my_stream.open("my_file_name",std::fstream::binary | std::fstream::in | std::fstream::out);
if(!my_stream)
std::cout<<"error"<<strerror(errorno);
我得到这个结果:没有这样的文件或目录."
I get this result: "No such file or directory."
在这种情况下如何创建文件?
How can I create the file in this case?
推荐答案
您在调用 fstream::open().这是已知强制它需要现有文件.
You're specifying std::fstream::in in your call to fstream::open(). This is known to force it to require an existing file.
从你的 mode 参数中删除 std::fstream::in，或者指定 std::fstream::trunc 除了其他标志.
Either remove std::fstream::in from your mode argument, or specify std::fstream::trunc in addition to the other flags.
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