写照片（和其他东西）到磁盘，并在以后在iphone中获取它们 [英] Writing photos (and other things) to disk and getting them later in iphone

问题描述

pre $ NS $ args * ;
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，我尝试检索表格视图的单元格图像：

  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]与savePath返回相同的NSString。还有什么可能是这个问题？ [NSData dataWithContentsOfFile：[leaf content]]; 返回零.... 编辑：我正在原始数据，我这样调用writeToFile：

  NSData * dataToAdd = UIImageJPEGRepresentation（image，1.0）; 
  

感谢您们

解决方案如果你有一个名为 file ，那么你将写入路径 filephoto ，但我想你想要的是像 filephoto.jpg ...也许你需要一个图像文件扩展名？或者路径没有完全展开...即使它是相同的，它可能是你没有给 dataWithContentsOfFile：

一个绝对路径。

这是我的猜测。

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

解决方案

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 path filephoto, but i think what you want is something like filephoto.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.

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