Question

How to append text to a text file in C++? (5 answers)

Closed 9 years ago.

在C++中,我需要写到现有档案中,并保留以前的内容。

这是我所做的工作:

std::ofstream logging;

logging.open(FILENAME);

logging << "HELLO
";

logging.close();

但是,我先前的案文已经过时(一)。我有什么错误?

提前感谢。

Answer 1

logging.open(FILENAME, std::ios_base::app);

Answer 2

您必须用附录方式打开档案:

logging.open(FILENAME, std::ios::app);

Answer 3

第二个参数是<代码>开放<>。你们应该检查的两种选择是:

Answer 4

do you try ? something like that

myFile.open( "file.txt", ios::out | ios::app );