ofstream open出错

最新推荐文章于 2025-05-31 14:23:57 发布

Chasen_y

最新推荐文章于 2025-05-31 14:23:57 发布

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分类专栏： C++

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本文介绍了C++中使用ofstream进行文件操作的方法，包括如何打开文件以追加方式写入内容，并讨论了当文件已打开时再次尝试打开可能导致的问题。

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INT CWriteFileBase::OpenCsvFile(ofstream& of, const CString& strLogFile)
{
	of.open(strLogFile, std::ofstream::app);
	if (!of)
	{
		return RET_ERR;
	}

	return RET_OK;
}

如果已经of.open了没有关闭，再执行of.open会失败。即open时候文件是没有被打开的。

附：

void open ( const char * filename,
ios_base::openmode mode = ios_base::in | ios_base::out );

Open file

Opens a file whose name is s, associating its content with the stream object to perform input/output operations on it. The operations allowed and some operating details depend on parameter mode.

The function effectively calls rdbuf()->open(filename,mode).

If the object already has a file associated (open), the function fails.

On failure, the failbit flag is set (which can be checked with member fail), and depending on the value set with exceptions an exception may be thrown.