我没有从服务器获得正确的输出。我每次都回复的回应是:
飘
/prod/bwckgens.p_proc_term_datehas been permanently removed from this server.
当您只是将网络浏览器定向到页面here而不是首先浏览this页面时,通常会收到此消息。这让我得出结论,没有保存cookie,但我在文档中读到这一切都是由NSURLConnection对象处理的。我在这里做错了吗?
#import "PCFViewController.h"
@interface PCFViewController ()
@end
NSMutableData *mutData;
@implementation PCFViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)queryServer {
NSURL *url = [NSURL URLWithString:@"https://selfservice.mypurdue.purdue.edu/prod/bwckschd.p_disp_dyn_sched"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLCacheStorageAllowed timeoutInterval:3.0];
//the reason I perform a GET here is just to get a cookie and communicate like a normal web browser, since directly doing a POST to the proper address isn't working
[request setHTTPMethod:@"GET"];
[request setValue:@"text/html; charset=UTF-8" forHTTPHeaderField:@"Content-Type"];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
if (connection) {
mutData = [NSMutableData data];
}
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(@"Succeeded! Received %d bytes of data",[mutData length]);
NSString *str = [[NSString alloc] initWithData:mutData encoding:NSUTF8StringEncoding];
//just to see the contents(for debugging)
NSLog(@"%@", str);
[self handleConnection:connection];
}
-(void)handleConnection:(NSURLConnection *)connection
{
//this is the first step
if ([@"/prod/bwckschd.p_disp_dyn_sched" isEqualToString:[[[connection originalRequest] URL] path]]) {
//first request
//POST
NSURL *url = [NSURL URLWithString:@"https://selfservice.mypurdue.purdue.edu/prod/bwckgens.p_proc_term_date"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLCacheStorageAllowed timeoutInterval:3.0];
[request setHTTPMethod:@"POST"];
NSString *args = @"p_calling_proc=bwckschd.p_disp_dyn_sched&p_term=201320";
NSData *requestBody = [args dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:requestBody];
connection = [connection initWithRequest:request delegate:self];
[connection start];
if (connection) {
mutData = [NSMutableData data];
}
//second step. Here I send the list of classes(COMPUTER SCIENCE) I want to display as well as the term SPRING2013
}else if([@"/prod/bwckgens.p_proc_term_date" isEqualToString:[[[connection currentRequest] URL] path]]) {
NSURL *url = [NSURL URLWithString:@"https://selfservice.mypurdue.purdue.edu/prod/bwckschd.p_get_crse_unsec"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLCacheStorageAllowed
timeoutInterval:3.0];
[request setHTTPMethod:@"POST"];
NSString *args = @"term_in=201320&sel_subj=dummy&sel_day=dummy&sel_schd=dummy&sel_insm=dummy&sel_camp=dummy&sel_levl=dummy&sel_sess=dummy&sel_instr=dummy&sel_ptrm=dummy&sel_attr=dummy&sel_subj=CS&sel_crse=dummy&sel_title=dummy&sel_schd=%25&sel_from_cred=&sel_to_cred=&sel_camp=%25&sel_ptrm=%25&sel_instr=%25&sel_sess=%25&sel_attr=%25&begin_hh=0&begin_mi=0&begin_ap=a&end_hh=0&end_mi=0&end_ap=a";
NSData *requestBody = [args dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:requestBody];
connection = [connection initWithRequest:request delegate:self];
[connection start];
if (connection) {
mutData = [NSMutableData data];
}
//the courses should be shown now I have to parse the data
}else if([@"/prod/bwckschd.p_get_crse_unsec" isEqualToString:[[[connection currentRequest] URL] path]]) {
}
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"%@\n", error.description);
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[mutData setLength:0];
NSLog(@"%@\n", response.description);
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[mutData appendData:data];
}
@end
答案 0 :(得分:2)
启动后,无法使用相同的URL连接更改请求对象。阅读NSURLConnection的文档。它说:
要加载的网址请求。请求对象作为一部分进行深度复制 初始化过程。此方法后对请求所做的更改 返回不会影响用于加载的请求 过程
因此,如果您想要点击另一个URL,则必须创建一个新的URLRequest和新的URLConnection对象。关于保存cookie的问题。您可以使用以下方法设置URLRequest的缓存策略
- (void)setCachePolicy:(NSURLRequestCachePolicy)policy