将照片（和其他内容）写入磁盘并稍后在 iPhone 中获取它们
我正在尝试将图像写入磁盘：
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString* savePath = [documentsPath stringByAppendingPathComponent:@"photo"];
BOOL result = [data writeToFile:savePath atomically:YES];
if(result) NSLog(@"Save of photo success!");
然后，稍后，我尝试检索表视图单元格图像：
NSData* getPhoto = [NSData dataWithContentsOfFile:[leaf content]];
UIImage* myImage = [UIImage imageWithData:getPhoto];
cell.imageView.image = myImage;
是的，我检查以确保 [leaf content] 返回与 savePath 相同的 NSString。还有什么问题？ [NSData dataWithContentsOfFile:[leaf content]]; 返回 nil....
编辑：我正在以这种方式制作我称之为 writeToFile 的原始数据：
NSData* dataToAdd = UIImageJPEGRepresentation(image, 1.0);
谢谢大家
I'm trying to write an image to disk:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString* savePath = [documentsPath stringByAppendingPathComponent:@"photo"];
BOOL result = [data writeToFile:savePath atomically:YES];
if(result) NSLog(@"Save of photo success!");
Then, later, I try to retrieve for a table view cell image:
NSData* getPhoto = [NSData dataWithContentsOfFile:[leaf content]];
UIImage* myImage = [UIImage imageWithData:getPhoto];
cell.imageView.image = myImage;
Yes, I checked to make sure the [leaf content] returns the same NSString as savePath. What else could be the problem? [NSData dataWithContentsOfFile:[leaf content]]; returns nil....
EDIT: I am making the original data that I call writeToFile on this way:
NSData* dataToAdd = UIImageJPEGRepresentation(image, 1.0);
Thanks guys
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您的新文件名可能不是有效的照片。
如果您有一个名为
file的图像，那么您将写入路径filephoto，但我认为您想要的是类似filephoto.jpg>...也许您需要图像文件扩展名？或者路径可能没有完全展开......即使它是相同的，也可能您没有给
dataWithContentsOfFile:绝对路径。这些是我的猜测。
It's possible that your new filename is not a valid photo.
If you have an image named
file, then you will be writing to the pathfilephoto, but i think what you want is something likefilephoto.jpg... maybe you need a image file extension?Or maybe the path isn't fully expanded...even though it is the same, its possible that you aren't giving
dataWithContentsOfFile:an absolute path.Those are my guesses.