请不要关闭此主题。我真的需要帮助。 我正在开发IOS 6.Xcode-4.5.2 在按钮上单击我从服务器
获取以下xml数据<country>america</country>
<dateOfBirth xsi:nil="true"/>
<firstName>John</firstName>
<lastName>Smith</lastName>
<userEmail>johnsmith@email.com</userEmail>
我正在尝试解析它并获取值。我按照此网址http://www.edumobile.org/iphone/iphone-programming-tutorials/parsing-an-xml-file/中显示的示例执行了操作 但是我在调用parse方法时遇到错误。 而不是示例url中显示的appdelegate类我使用的是viewcontroller类。我不想在Appdelegate类中添加任何代码。
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[AppDelegate setUserDetails:]: unrecognized selector sent to instance 0x9272a40'
我只是iphone编程的初学者。所以我需要帮助解析这个成功，我只是想以某种方式获取值，以便我可以使用它们在一些标签的屏幕上显示。 下面是6个文件的代码（Viewcontroller.h＆amp; m，User.h＆amp; m，Xmlparser.h＆amp; m）
//ViewController.h
#import <UIKit/UIKit.h>
#import "GlobalVariable.h"
#import "QuotesViewController.h"
@interface ViewController : UIViewController <NSXMLParserDelegate,UIApplicationDelegate,NSStreamDelegate,UIAlertViewDelegate,WriteProtocol>
{
QuotesViewController *quoteobj;
NSMutableArray *userDetails;
}
@property (retain, nonatomic) IBOutlet UITextField *txtUsername;
@property (retain, nonatomic) IBOutlet UITextField *txtPassword;
@property (retain, nonatomic) NSInputStream *inputStream;
@property (retain, nonatomic) NSOutputStream *outputStream;
@property (nonatomic, retain) NSMutableArray *messages;
@property (retain, nonatomic) IBOutlet UILabel *label1;
- (IBAction)btnLogin:(id)sender;
- (IBAction)btnExit:(id)sender;
- (void)initNetworkCommunication;
- (void)readIn:(NSString *)s;
- (void)writeOut:(NSString *)s;
@property (nonatomic, retain) NSMutableArray *userDetails;
@end
//ViewController.m
#import "ViewController.h"
#import "NewTabViewController.h"
#import "QuotesViewController.h"
#import "XMLParser.h"
@implementation ViewController
@synthesize txtPassword,txtUsername,inputStream, outputStream,messages,label1,userDetails;
- (void)viewDidLoad
{
[super viewDidLoad];
quoteobj =[[QuotesViewController alloc]init];
quoteobj.myTableView = [[UITableView alloc]init];
quoteobj.myTableView.delegate=quoteobj;
quoteobj.myTableView.dataSource=quoteobj;
// Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)btnLogin:(id)sender {
NSLog(@"Clicked button1");
[self initNetworkCommunication];
NSString *response = [NSString stringWithFormat:@"POST\r\n\r\nTMS|Login|%@|%@",txtUsername.text,txtPassword.text];
NSLog(@"1");
[self writeOut:response];
}
- (IBAction)btnExit:(id)sender {
exit(0);
}
- (void) initNetworkCommunication {
NSLog(@"initNetworkCommunication called");
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"xxx.xxx.x.xx", xxxx, &readStream, &writeStream);
inputStream = (NSInputStream *)readStream;
outputStream = (NSOutputStream *)writeStream;
[inputStream retain];
[outputStream retain];
[inputStream setDelegate:self];
[outputStream setDelegate:self];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream open];
[outputStream open];
}
- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {
NSLog(@"stream event %i", streamEvent);
switch (streamEvent) {
case NSStreamEventOpenCompleted:
NSLog(@"Stream opened");
break;
case NSStreamEventHasBytesAvailable:
if (theStream == inputStream) {
uint8_t buffer[1024];
int len;
while ([inputStream hasBytesAvailable]) {
len = [inputStream read:buffer maxLength:sizeof(buffer)];
if (len > 0) {
NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding];
[self readIn:output];
if([output hasPrefix:@"JSESSIONID"]){
int len = [output length];
int lenn = len-29;
sessionId = [output substringWithRange:NSMakeRange(0, lenn)];
label1.text=sessionId;
NSLog(@"New String %@ LENGTH SESSUIn %i",sessionId,sessionId.length);
sessionId=label1.text;
NewTabViewController *so = [self.storyboard instantiateViewControllerWithIdentifier:@"newtab"];
for(UIViewController *ssa in so.viewControllers){
if([ssa isKindOfClass:[QuotesViewController class]]){
QuotesViewController *qq = (QuotesViewController *) ssa;
NSLog(@"PREESENTING THIS FZZZZZZZZZZZzzaaadfsdfssdfsa");
[qq setDel:self];
}
}
[self presentViewController:so animated:YES completion:nil];
}
}
}
}
break;
case NSStreamEventErrorOccurred:
NSLog(@"Can not connect to the host!");
UIAlertView *alert =[[UIAlertView alloc]initWithTitle:@"Server says.." message:@"Due to some reason server is unavailable" delegate:self cancelButtonTitle:nil otherButtonTitles:@"Ok", nil];
[alert show];
[alert release];
break;
case NSStreamEventEndEncountered:
NSLog(@"NSStreamEventEndEncountered:method is called");
[theStream close];
NSLog(@"theStream is closed");
[theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
NSLog(@"theStream is removed from runloop");
[theStream release];
NSLog(@"theStream is released");
NSLog(@"Server is unavailable");
theStream = nil;
if(theStream==nil){
UIAlertView *alert =[[UIAlertView alloc]initWithTitle:@"Server says.." message:@"Due to some reason server is unavailable" delegate:self cancelButtonTitle:nil otherButtonTitles:@"Ok", nil];
[alert show];
[alert release];
}
NSLog(@"IT reaches 1 here");
break;
default:
NSLog(@"Unknown event");
}
}//End of stream
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
NSLog(@"IT reaches here");
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
if([title isEqualToString:@"Ok"])
{
NSLog(@"Ok is clicked");
exit(0);
}
}
- (void) messageReceived:(NSString *)message {
NSLog(@"Entered MessageRecieved");
[messages addObject:message];
}
- (void)readIn:(NSString *)s {
NSLog(@"%@", s);
if ([s hasPrefix:@"{"]) {
if([s rangeOfString:@"instrSymbol"].location ==NSNotFound){
NSLog(@"Received a data which is not instrumentid");
}
else{
NSLog(@"JSON DATA RECEIVED");
[quoteobj parseJsonData:s];
}
}
else if([s hasPrefix:@"<"]){
NSLog(@"XML DATA RECEIVED");
NSData *xmlData= [[NSData alloc]initWithData:[s dataUsingEncoding:NSUTF8StringEncoding]];
NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:xmlData];
XMLParser *parser = [[XMLParser alloc] initXMLParser];
//Set delegate
[xmlParser setDelegate:parser];
//Start parsing the XML file.
BOOL success = [xmlParser parse];
if(success)
NSLog(@"No Errors");
else
NSLog(@"Error Error Error!!!");
}
}
- (void)writeOut:(NSString *)s {
if (outputStream) {
NSLog(@"WRITING OUT");
uint8_t *buf = (uint8_t *)[s UTF8String];
[outputStream write:buf maxLength:strlen((char *)buf)];
NSLog(@"Writing out the following:");
NSLog(@"%@", s);
}
else{
NSLog(@"Noutoyt");
}
}
@end
//XMLParser.h
#import <Foundation/Foundation.h>
@class ViewController,User;
@interface XMLParser : NSObject{
NSMutableString *currentElementValue;
ViewController *zappDelegate;
User *aBook;
}
- (XMLParser *) initXMLParser;
@end
//XMLParser.m
#import "XMLParser.h"
#import "ViewController.h"
#import "User.h"
@implementation XMLParser
- (XMLParser *) initXMLParser {
[super init];
zappDelegate = (ViewController *)[[UIApplication sharedApplication] delegate];
return self;
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict {
if([elementName isEqualToString:@"country"]) {
//Initialize the array.
zappDelegate.userDetails = [[NSMutableArray alloc] init];
}
else if([elementName isEqualToString:@"firstName"]) {
//Initialize the book.
aBook = [[User alloc] init];
//Extract the attribute here.
//aBook.bookID = [[attributeDict objectForKey:@"id"] integerValue];
//NSLog(@"Reading id value :%i", aBook.bookID);
}
NSLog(@"Processing Element: %@", elementName);
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
if(!currentElementValue)
currentElementValue = [[NSMutableString alloc] initWithString:string];
else
[currentElementValue appendString:string];
NSLog(@"Processing Value: %@", currentElementValue);
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
if([elementName isEqualToString:@"Books"])
return;
if([elementName isEqualToString:@"Book"]) {
[zappDelegate.userDetails addObject:aBook];
[aBook release];
aBook = nil;
}
else
[aBook setValue:currentElementValue forKey:elementName];
[currentElementValue release];
currentElementValue = nil;
}
@end
//User.h
#import <Foundation/Foundation.h>
@interface User : NSObject {
//NSInteger bookID;
NSString *firstName; //Same name as the Entity Name.
NSString *lastName; //Same name as the Entity Name.
NSString *userEmail; //Same name as the Entity Name.
}
@property (nonatomic, retain) NSString *firstName;
@property (nonatomic, retain) NSString *lastName;
@property (nonatomic, retain) NSString *userEmail;
@end
//User.m
#import "User.h"
@implementation User
@synthesize firstName,lastName,userEmail;
- (void) dealloc {
[firstName release];
[lastName release];
[userEmail release];
[super dealloc];
}
@end
答案 0 :(得分：1)
您创建了一个名为ViewController的类，但是您尝试通过转换不相关的application delegate来在XMLParser类中分配它的实例。
zappDelegate = (ViewController *)[[UIApplication sharedApplication] delegate];
您需要将zappDelegate的名称更改为更合适的名称，并为其指定ViewController的实际实例。
我注意到您的ViewController符合UIApplicationDelegate协议，但不会自动使其成为应用程序委托。应在main.m[m]文件中正确设置真实的代理。
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
答案 1 :(得分：0)
检查此链接我修改了源：
http://dcraziee.wordpress.com/2013/05/29/parsing-xml-in-objective-c/
它会从xml响应中返回字典。 xml中的所有键都是键，值将是字典值的一部分。
如果您包含hierarchal xml，则会相应地进行管理。 我希望这将有所帮助。