Ios iPhone:copyItemAtPath中出错
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:Ios iPhone:copyItemAtPath中出错,ios,objective-c,nsfilemanager,Ios,Objective C,Nsfilemanager,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]; N
- (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"}
第1期:
发生此问题的原因是,目录中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,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"];
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:
必须提供文件名而不是目录
替换:
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:documentsDirectory error:&error];
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:documentsDirectory error:&error];
与:
替换此行:
与:
copyItemAtPath
:给出错误,因为该文件已存在于该位置。所以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];
只要仔细阅读错误,您的答案就在错误文件中,并且该名称已经存在
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:dataPath error:&error];
if ([[NSFileManager defaultManager] fileExistsAtPath: srcPath])
[[NSFileManager defaultManager] removeItemAtPath: srcPath error:nil];