将数据保存到缓存目录(iPhone)时出错 [英] Error saving data to cache directory (iPhone)
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问题描述
我尝试使用以下代码保存图片:
- (void)writeData {
if(cacheFileName == nil)
return;
if(cacheDirectoryPath == nil)
return;
if(![[NSFileManager defaultManager] fileExistsAtPath:[self filePath]]){
NSData * imageData = UIImageJPEGRepresentation(self.image,0.9);
NSError * writeError = nil;
BOOL didWrite = [imageData writeToFile:[self filePath] options:NSAtomicWrite error:& writeError];
if(writeError)
NSLog([writeError localizedDescription]);
if(didWrite)
NSLog(@image saved);
else
NSLog(@image not saved);
}
}
- (NSString *)filePath {
NSArray * paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES);
NSString * cacheDirectory = [paths objectAtIndex:0];
NSString * filename = [cacheDirectory stringByAppendingPathComponent:cacheDirectoryPath];
filename = [filename stringByAppendingPathComponent:cacheFileName];
NSLog(filename);
return filename;
}
我收到错误:
2009-06-23 16:39:19.740 XXX [33454:20b]操作无法完成。 (可能错误4.)
我看了看这个错误有以下含义: p>
NSFileNoSuchFileError = 4,//尝试对不存在的文件执行文件系统操作
这不合理,因为文件不应该存在。
已尝试编写png表示并使用方便方法:
- (BOOL)writeToFile:(NSString *)path atomically :( BOOL)flag
我使用类似的代码保存plist,他们工作正常。我不知道什么问题是。任何想法?解决方案我看到你在缓存目录中使用一些中间目录,是/他们创建?如果不尝试删除它们或使用
- [NSFileManager createDirectoryAtPath:withIntermediateDirectories:attributes:error:]
以在
之前创建I am trying to save images using the following code:
- (void)writeData{ if(cacheFileName==nil) return; if(cacheDirectoryPath==nil) return; if (![[NSFileManager defaultManager] fileExistsAtPath:[self filePath]]) { NSData *imageData = UIImageJPEGRepresentation(self.image, 0.9); NSError *writeError= nil; BOOL didWrite = [imageData writeToFile:[self filePath] options:NSAtomicWrite error:&writeError]; if(writeError) NSLog([writeError localizedDescription]); if(didWrite) NSLog(@"image saved"); else NSLog(@"image not saved"); } } - (NSString *)filePath{ NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); NSString *cacheDirectory = [paths objectAtIndex:0]; NSString *filename = [cacheDirectory stringByAppendingPathComponent:cacheDirectoryPath]; filename = [filename stringByAppendingPathComponent:cacheFileName]; NSLog(filename); return filename; }
I get an error:
2009-06-23 16:39:19.740 XXX[33454:20b] Operation could not be completed. (Cocoa error 4.)
I looked this up and see the error has the following meaning:
NSFileNoSuchFileError = 4, // Attempt to do a file system operation on a non-existent file
Which doesn't make sense since the file shouldn't exist.
I have tried writing the png representation and using the convenience method:
- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)flag
I am using similar code to save plists, and they work fine. I am not sure what the problem is. Any ideas?
解决方案I see that you use some intermediate directory within the Cache Directory, are it/they created? If not try removing them or use
-[NSFileManager createDirectoryAtPath:withIntermediateDirectories:attributes:error:]
to create them before
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