ios - 错误域=NSCocoaErrorDomain 代码=512 "The operation couldn’ t be completed.The operation couldn't be completed.是一个目录

Question

我想使用writeToFile 来存储图片到文件中，但是发现下面的错误，如何解决？

Error Domain=NSCocoaErrorDomain Code=512“操作无法完成。(Cocoa 错误 512。)”{NSFilePath=/Users/alexqdh/Library/Application Support/iPhone Simulator/6.0/Applications/xxx/Documents/girl.png, NSUnderlyingError=0x753e630 “操作无法完成。是一个目录”

-(NSString*)getImagePath:(NSString *)name
{
    NSArray *path =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES);
    NSString *docPath = [path objectAtIndex:0];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *finalPath = [docPath stringByAppendingPathComponent:name];
    [fileManager createDirectoryAtPath:finalPath withIntermediateDirectories:YES attributes:nil error:nil];
    return finalPath;
}
//below is how to use NSData writeToFile
AFImageRequestOperation *opera = [AFImageRequestOperation imageRequestOperationWithRequest:request imageProcessingBlock:nil
    success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
    img.image = image;
    [self.view addSubview:img];
    NSData *imageData = UIImagePNGRepresentation(img.image);
    if(imageData == nil)
    {
        NSLog(@"imageData nil");
    }
    NSString *picPath = [self getImagePath:@"girl.png"];
    NSLog(@"path:%@",picPath);
    NSError *error = [[NSError alloc]init];
    BOOL a = [imageData writeToFile:picPath options:NSDataWritingAtomic error:&error];
    if(a == YES)
    {
        NSLog(@"YES");
    }
    else
    {
        NSLog(@"NO.error:%@", error);
    }

    /*NSData *imageData = UIImagePNGRepresentation(img.image);
    NSString *picPath = [self getImagePath:@"girl.png"];
    [imageData writeToFile:picPath atomically:YES];*/

    NSLog(@"Got it.code:%d",response.statusCode);
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
    NSLog(@"Failed pic.error:%@",error);
}];

[opera start];

Answer 1

问题是由于创建了一个带有图像名称的目录，然后试图写入一个文件来代替该目录引起的。换句话说，您首先要创建一个名为:

Documents/girl.png/

然后您尝试将文件写入路径:

Documents/girl.png

显然这不是您的本意。在您的 getImagePath: 方法中，删除创建目录的调用。 Documents 目录已经存在。当然，您不需要与文件名对应的目录。

另一种选择是将 getImagePath: 更改为:

- (NSString*)getImagePath:(NSString *)name {
    NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES);
    NSString *docPath = [path objectAtIndex:0];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *finalPath = [docPath stringByAppendingPathComponent:name];

    // Remove the filename and create the remaining path
    [fileManager createDirectoryAtPath:[finalPath stringByDeletingLastPathComponent] withIntermediateDirectories:YES attributes:nil error:nil];

    return finalPath;
}

此更新后的代码现在支持您传递包含您可能需要的子目录的 name 值。