iPhone: Error in copyItemAtPath - ios

Question

I am trying to copy a file from one folder to another folder in documents directory like this:
- (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");
}
}
When i log error, it gives me the following message:
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"}

Answer 1

Issue 1:
The issue occurred because, the directory already contains a file with same file name.
You should check whether the file exist in the folder or not like:
- (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);
}
}
Issue 2:
You must provide a file name not a directory.
Replace:
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:documentsDirectory error:&error];
With:
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:dataPath error:&error];

Answer 2

copyItemAtPath: is giving error as that file is already exist in that location. So you should do this before you copy file.
if ([[NSFileManager defaultManager] fileExistsAtPath: srcPath])
[[NSFileManager defaultManager] removeItemAtPath: srcPath error:nil];

Answer 3

Replace this line:
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:documentsDirectory error:&error];
With:
BOOL success = [[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:dataPath error:&error];