英文:
Fail to copy file (access denied) even though I ran as admin
问题
我正在尝试制作一个应用程序，用于将文件从一个驱动器复制到另一个驱动器，但由于某种原因，它不断给我一个错误，说我没有写入权限，即使我以管理员身份运行，运行此应用程序的帐户是设备上唯一的帐户。我知道我对目标有写入权限，因为：
- 大量文件（共 n 个文件）能够成功复制到目标位置。
- 我已经为用户赋予了目录的完全权限。
- 目标是外部存储驱动器。
- 我可以在该目标目录中创建新文件。
此外：我使用的是 Windows 10。
复制功能：
private void c2cTransfer(Path source, Path dest) throws Exception {
// 获取输出文件的通道
FileOutputStream fos = new FileOutputStream(dest.toFile());
WritableByteChannel targetChannel = fos.getChannel();
// 获取输入文件的通道
FileInputStream fis = new FileInputStream(source.toString());
FileChannel inputChannel = fis.getChannel();
System.out.print("关闭所有 IO 读取器...\t");
// 将数据从输入通道传输到输出通道
inputChannel.transferTo(0, inputChannel.size(), targetChannel);
// 关闭输入通道
inputChannel.close();
fis.close();
// 最后关闭目标通道
targetChannel.close();
fos.close();
}
调用该函数的位置：
if (newPath.toFile().canWrite()) {
c2cTransfer(f, newPath); // 开始传输
System.out.printf("完成！\n");
} else {
// 不断跳转到此处。
System.err.printf("失败！\n您没有写入权限：%s\n", newLocation);
failedTransfer.add(f);
}
英文:
I'm trying to make an app that copies files from one drive to another, but for some reason, it keeps giving me an error saying I do not have permission to write even though I ran as admin and the account that is running this app is the only account on the device. I know I have permission to the destination because
- A large number of files (out of n files) are able to copy to the destination successfully
- I have given the user full permission to the directory
- The destination is an external storage drive.
- I can make a new file in that destination's directory
Additionally: I'm on windows 10
Copy function:
private void c2cTransfer(Path source, Path dest) throws Exception {
// Get channel for output file
FileOutputStream fos = new FileOutputStream(dest.toFile());
WritableByteChannel targetChannel = fos.getChannel();
// Get channel for input files
FileInputStream fis = new FileInputStream(source.toString());
FileChannel inputChannel = fis.getChannel();
System.out.print("Closing all IO readers...\t");
// Transfer data from input channel to output channel
inputChannel.transferTo(0, inputChannel.size(), targetChannel);
// close the input channel
inputChannel.close();
fis.close();
// finally close the target channel
targetChannel.close();
fos.close();
}
Where the function is being called:
if (newPath.toFile().canWrite()) {
c2cTransfer(f, newPath); // Start transfer
System.out.printf("Complete!\n");
} else {
// Keep jumping to here.
System.err.printf("Failed!\nYou do not have permission to write to: %s\n", newLocation);
failedTransfer.add(f);
}
答案1
得分: 0
结果发现这些文件需要事先存在，所以我的解决方案是：
if (!newPath.toFile().exists()) {
newPath.toFile().getParentFile().mkdirs();
newPath.toFile().createNewFile();
}
虽然我有一两个文件仍然因为访问权限被拒绝而导致出现问题，尽管它们是存在的并且我对它们有完全权限。因此，我只是创建了一个覆盖函数，用它来删除旧文件并写入新副本。
英文:
Turns out the files needed to exist before hand, so my solution was this:
if (!newPath.toFile().exists()) {
newPath.toFile().getParentFile().mkdirs();
newPath.toFile().createNewFile();
}
Though I have one or two files that still giving me access denied even though it exist and I have full permission over it. So, I just made a override function that just deletes the old files and writes a new copy.
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