（在 MAC OSX-Xcode 中）我尝试使用 NSURLConnection 类通过 FTP 读取文件，只要我的代码在主应用程序委托类（AppDelegate）中，但如果我在外部使用它（另一个 .h .m 文件）连接，它就可以正常工作未调用委托。
有什么帮助！？
这是我的代码：
-(void)getURL {
NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:@"ftp://.... connection string with file"]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
NSURLConnection *connection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (connection) {
// Do something
} else {
// Inform the user that the connection failed.
NSLog(@"connection failed");
}
}
代表：
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(@"didReceiveResponse");
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(@"connectionDidFinishLoading");
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
//Getting file data
[receivedData appendData:data];
}