将扩展名的所有文件复制到文档目录
我在 xcode 中将文件从在线位置复制到 iPad 的文档目录时遇到了一些问题。 我想要下载的文件必须是扩展名为“xml”的文件。
现在我正在这样做:
NSData *onlineLink = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://localhost:8888/"]];
NSString *extension = @"xml";
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSArray *contents = [fileManager contentsOfDirectoryAtPath:onlineLink error:NULL];
NSEnumerator *e = [contents objectEnumerator];
NSString *filename;
while ((filename = [e nextObject])) {
if ([[filename pathExtension] isEqualToString:extension]) {
[fileManager copyItemAtPath:[documentsDirectory stringByAppendingPathComponent:filename toPath:documentsDirectory error:NULL]];
}
}
但是这不起作用,我收到此错误:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSConcreteData fileSystemRepresentation]: unrecognized selector sent to instance 0xb000800'
任何人都可以给我提示为什么我收到错误吗?
I am having a little bit trouble with copying files from an online place to the Documents Directory of the iPad in xcode.
The files that i want to download had to be the files with the extension 'xml'.
now i am doing this:
NSData *onlineLink = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://localhost:8888/"]];
NSString *extension = @"xml";
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSArray *contents = [fileManager contentsOfDirectoryAtPath:onlineLink error:NULL];
NSEnumerator *e = [contents objectEnumerator];
NSString *filename;
while ((filename = [e nextObject])) {
if ([[filename pathExtension] isEqualToString:extension]) {
[fileManager copyItemAtPath:[documentsDirectory stringByAppendingPathComponent:filename toPath:documentsDirectory error:NULL]];
}
}
However this does not work, i get this error:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSConcreteData fileSystemRepresentation]: unrecognized selector sent to instance 0xb000800'
Can anybody give me a hint why i am getting the error?
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行中:
contentsOfDirectoryAtPath 应该是一个 NSString,您正在传递一个 NSData 对象
in the line:
contentsOfDirectoryAtPath should be an NSString, you are passing an NSData object