iPhone:copyItemAtPath 中的错误
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【中文标题】iPhone:copyItemAtPath 中的错误【英文标题】:iPhone: Error in copyItemAtPath 【发布时间】:2013-11-25 04:50:32 【问题描述】:我正在尝试将文件从一个文件夹复制到文档目录中的另一个文件夹,如下所示:
- (void)saveFile:(NSString *)folderPath
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"destination.png"];
NSError *error = nil;
NSString *srcPath = [folderPath stringByAppendingPathComponent:@"filename.png"];
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:documentsDirectory error:&error];
if (error)
NSLog(@"%@",error);
if (success == YES)
NSLog(@"Copied");
else
NSLog(@"Not Copied");
当我记录错误时,它会给我以下消息:
Error Domain=NSCocoaErrorDomain Code=516 "The operation couldn’t be completed. (Cocoa error 516.)" UserInfo=0x9d665a0 NSUserStringVariant=(
Move
), NSFilePath=/Users/username/Library/Application Support/iPhone Simulator/5.1/Applications/BC37C9D7-7995-47C1-8131-2B07BADCBECB/Documents/foldername/B713320C-2CA0-4FD3-93F6-71D76B102B83/src.png, NSDestinationFilePath=/Users/username/Library/Application Support/iPhone Simulator/5.1/Applications/BC37C9D7-7995-47C1-8131-2B07BADCBECB/Documents, NSUnderlyingError=0x9d41c60 "The operation couldn’t be completed. File exists"
【问题讨论】:
仔细阅读错误,您的答案在该名称的错误文件中已经存在 【参考方案1】:问题 1: 出现此问题的原因是,该目录已包含具有相同文件名的文件。
您应该检查文件夹中是否存在该文件:
- (void)saveFile:(NSString *)folderPath
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"destination.png"];
NSError *error = nil;
NSString *srcPath = [folderPath stringByAppendingPathComponent:@"filename.png"];
if ([[NSFileManager defaultManager] fileExistsAtPath:dataPath])
//removing file
if (![[NSFileManager defaultManager] removeItemAtPath:dataPath error:&error])
NSLog(@"Could not remove old files. Error:%@",error);
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:dataPath error:&error];
if (success == YES)
NSLog(@"Copied");
else
NSLog(@"Not Copied %@", error);
问题 2: 您必须提供文件名而不是目录。
替换:
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:documentsDirectory error:&error];
与:
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:dataPath error:&error];
【讨论】:
【参考方案2】:copyItemAtPath
: 给出错误,因为该文件已存在于该位置。因此,您应该在复制文件之前执行此操作。
if ([[NSFileManager defaultManager] fileExistsAtPath: srcPath])
[[NSFileManager defaultManager] removeItemAtPath: srcPath error:nil];
【讨论】:
【参考方案3】:替换这一行:
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:documentsDirectory error:&error];
与:
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:dataPath error:&error];
【讨论】:
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