将字符串写入文件末尾（C++）
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Writing a string to the end of a file (C++)
提问by ked
I have a program already formed that has a string that I want to stream to the end of an existing text file. All of what little I have is this: (C++)
我有一个已经形成的程序，它有一个字符串，我想将其流式传输到现有文本文件的末尾。我所拥有的一切都是这样的：（C++）
void main()
{
std::string str = "I am here";
fileOUT << str;
}
I realize there is much to be added to this and I do apologize if it seems I am asking people to code for me, but I am completely lost because I have never done this type of programming before.
我意识到还有很多要补充的，如果我似乎在要求人们为我编码，我深表歉意，但我完全迷失了，因为我以前从未做过这种类型的编程。
I have attempted different methods that I have come across the internet, but this is the closest thing that works and is somewhat familiar.
我尝试了我在互联网上遇到的不同方法，但这是最接近的方法并且有点熟悉。
回答by Chad
Open your file using std::ios::app
使用打开您的文件 std::ios::app
#include <fstream>
std::ofstream out;
// std::ios::app is the open mode "append" meaning
// new data will be written to the end of the file.
out.open("myfile.txt", std::ios::app);
std::string str = "I am here.";
out << str;
回答by Seth Carnegie
To append contents to the end of files, simply open a file with ofstream(which stands for out file stream) in appmode (which stands for append).
要将内容追加到文件末尾，只需打开一个文件，其中ofstream（代表out 文件流） in appmode （代表append）。
#include <fstream>
using namespace std;
int main() {
ofstream fileOUT("filename.txt", ios::app); // open filename.txt in append mode
fileOUT << "some stuff" << endl; // append "some stuff" to the end of the file
fileOUT.close(); // close the file
return 0;
}
回答by Mike Bailey
I hope that isn't your whole code because if it is, there's lots of things wrong with it.
我希望这不是你的全部代码，因为如果是，那么它有很多问题。
The way you would write out to a file looks something like this:
您写出到文件的方式如下所示：
#include <fstream>
#include <string>
// main is never void
int main()
{
std::string message = "Hello world!";
// std::ios::out gives us an output filestream
// and std::ios::app appends to the file.
std::fstream file("myfile.txt", std::ios::out | std::ios::app);
file << message << std::endl;
file.close();
return 0;
}
回答by Blindy
Open your stream as append, new text written to it will be written at the end of the file.
以追加方式打开您的流，写入其中的新文本将写入文件末尾。
