windows 如何在 Visual C++ 中复制文件？
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How to copy files in Visual C++?
提问by karikari
I am using Visual C++. How to copy the content of this file to another file?
我正在使用 Visual C++。如何将此文件的内容复制到另一个文件？
UINT32 writeToLog(wstring log)
{
wfstream file1 (LOG_FILE_NAME, ios_base::out);
file1 << log;
file1.close();
// want to copy file1 to file2
return 0;
}
回答by JoeG
What exactly do you want to do? If you need a copy of the data, you can read it in and write it back out again. If you really need a copy of the file, you have to use OS specific calls.
你到底想做什么？如果您需要数据的副本，您可以读入并再次写回。如果您确实需要该文件的副本，则必须使用特定于操作系统的调用。
In many cases, reading in the file data and then writing it out again to a different file is a close enough approximation to a copy - like this:
在许多情况下，读入文件数据，然后再次将其写出到不同的文件，这与副本非常接近 - 像这样：
ifstream file1(...);
ofstream file2(...);
std::copy(istream_iterator<char>(file1),istream_iterator<char>(),ostream_iterator<char>(file2));
However that really isn't a copy - it's creating a new file with the same contents. It won't correctly handle hard links or symlinks, it won't correctly handle metadata and it will only 'copy' the default file stream.
然而，这真的不是一个副本——它正在创建一个具有相同内容的新文件。它不会正确处理硬链接或符号链接，它不会正确处理元数据，它只会“复制”默认文件流。
If you need a file copy on Windows you should call one of CopyFile, CopyFileExor CopyFileTransacteddepending on your exact requirements.
如果您需要在 Windows 上进行文件副本，您应该根据您的确切要求调用CopyFile、CopyFileEx或CopyFileTransacted 之一。
回答by JoeG
Standard C++ has no file copying facility, other than reading the file into memory and writing it out again to a different file. As you are using Windows, you can use the CopyFilefunction - other OSs have similar, OS-specific functions.
标准 C++ 没有文件复制功能，除了将文件读入内存并再次将其写出到不同的文件之外。当您使用 Windows 时，您可以使用CopyFile功能 - 其他操作系统具有类似的特定于操作系统的功能。
回答by Alec Jacobson
The above code from Joe Gauterin did not work for me. I was trying to copy a .tga image file, so maybe something about istream_iterator<char>screwed it up. Instead I used:
Joe Gauterin 的上述代码对我不起作用。我试图复制一个 .tga 图像文件，所以可能是istream_iterator<char>搞砸了。相反，我使用了：
ifstream file1(...);
ofstream file2(...);
char ch;
while(file1 && file1.get(ch))
{
file2.put(ch);
}
