使用 moveItemAtPath 将文件夹移动到临时文件夹时出现奇怪的错误。可可错误516

Question

我尝试将包含文件的文件夹移动到临时文件夹，但总是收到相同的错误： 操作无法完成。 （可可错误516。）

这是代码，你看到什么奇怪的地方了吗？提前致谢。

    // create new folder
NSString* newPath=[[self getDocumentsDirectory] stringByAppendingPathComponent:@"algo_bueno"];
NSLog(@"newPath %@", newPath);
if ([[NSFileManager defaultManager] fileExistsAtPath:newPath]) {
    NSLog(@"newPath already exists.");
} else {
    NSError *error;
    if ([[NSFileManager defaultManager] createDirectoryAtPath:newPath withIntermediateDirectories:YES attributes:nil error:&error]) {
        NSLog(@"newPath created.");
    } else {
        NSLog(@"Unable to create directory: %@", error.localizedDescription);
        return;
    }
}

// create a file in that folder
NSError *error;
NSString* myString=[NSString stringWithFormat:@"Probando..."];
NSString* filePath=[newPath stringByAppendingPathComponent:@"myfile.txt"];
if ([myString writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error]) {
    NSLog(@"File created.");
} else {
    NSLog(@"Failed creating file. %@", error.localizedDescription);
    return;
}

// move this folder and its folder
NSString *tmpDir = NSTemporaryDirectory();
NSLog(@"temporary directory, %@", tmpDir);
if ([[NSFileManager defaultManager] moveItemAtPath:newPath toPath:tmpDir error:&error]) {
    NSLog(@"Movido a temp correctamente");
} else {
    NSLog(@"Failed moving to temp. %@", error.localizedDescription);
}

Answer 1

错误 516 是 NSFileWriteFileExistsError

您无法将文件移动到文件已存在的位置:)

（请参阅此处的文档 - https://developer.apple.com/library/mac /#documentation/Cocoa/Reference/Foundation/Miscellaneous/Foundation_Constants/Reference/reference.html 并搜索“516”）

---

更多有用的是，您的目标路径应该是文件名，而不是文件夹。试试这个：

// move this folder and its folder
NSString *tmpDir = NSTemporaryDirectory();
NSString *tmpFileName = [tmpDir stringByAppendingPathComponent:@"my-temp-file-name"];
NSLog(@"temporary directory, %@", tmpDir);
if ([[NSFileManager defaultManager] moveItemAtPath:newPath toPath:tmpFileName error:&error]) {
    NSLog(@"Movido a temp correctamente");
} else {
    NSLog(@"Failed moving to temp. %@", error.localizedDescription);
}

Answer 2

使用以下方法获取唯一的临时文件夹名称：

NSFileManager 唯一文件名

CFUUIDRef uuid = CFUUIDCreate(NULL);
CFStringRef uuidString = CFUUIDCreateString(NULL, uuid);
NSString *tmpDir = [[NSTemporaryDirectory() stringByAppendingPathComponent:(NSString *)uuidString];
CFRelease(uuid);
CFRelease(uuidString);
// MOVE IT
[[NSFileManager defaultManager] moveItemAtPath:myDirPath toPath:tmpDir error:&error]

Answer 3

moveItemAtPath:toPath:error: 的目标路径必须是要移动的文件或目录的完整新路径。正如您现在所做的那样，您基本上是在尝试用您的文件覆盖临时目录本身。

简单修复：

NSString *targetPath = [tmpDir stringByAppendingPathComponent:[newPath lastPathComponent]];
if ([[NSFileManager defaultManager] moveItemAtPath:targetPath toPath: error:&error]) {
   NSLog(@"Moved sucessfully");
}