iphone – 如何从互联网上下载docx,pdf,图像,pptx或任何文件

代码如下：
在这个buttonClicked从其他文件中调用
DownloadingFile.h

#import "MyAppDelegate.h"

@interface DownloadingFile : NSObject
{
    NSMutableData *webData;
    NSMutableString *soapResults;
    NSURLConnection *conn;
    BOOL *elementFound; 
    BOOL isDoneParsing;
    MyAppDelegate *mydelegate;

    NSString *userCd,*password,*siteUrl;

}
@property (nonatomic,retain) MyAppDelegate *mydelegate;
-(void)buttonClicked;
-(bool)getIsDone;
@end

DownloadingFile.m

#import "DownloadingFile.h"
#import "iExploreAppDelegate.h"

@implementation DownloadingFile

@synthesize mydelegate;

- (void)buttonClicked
{
    mydelegate=(MyAppDelegate *)[[UIApplication sharedApplication] delegate];

    userCd=[[NSString alloc] initWithString:[mydelegate getUserId]];
    password=[[NSString alloc] initWithString:[mydelegate getpassword]];

    NSLog(@"In Downloading; ");

    NSURL *url =[NSURL URLWithString:[@"http://abcdef.xyz.com/Docs/NewFolder/myFile.docx" StringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

    NSMutableURLrequest *req = [NSMutableURLrequest requestWithURL:url];
        [req SETVALue:[NSString StringWithFormat:@"bytes=%ld-",0] forhttpHeaderField:@"Range"];
        [req addValue: @"docx" forhttpHeaderField:@"Content-Type"];
        [req sethttpR_490_11845@ethod:@"POST"];

      //---set the headers---
   conn = [[NSURLConnection alloc] initWithrequest:req delegate:self startImmediately:YES];

    if (conn) {
        NSLog(@"connection done ");

       webData = [[NSMutableData data] init];
    }   
} 


-(void)connection:(NSURLConnection *)connection didReceiveAuthenticationChALLENge:(NSURLAuthenticationChALLENge *)chALLENge {
    if([chALLENge prevIoUsFailureCount] == 0) {
        NSURLCredential *newCredential;

      newCredential=[NSURLCredential credentialWithUser:userCd password:password persistence:NSURLCredentialPersistenceNone];
      NSLog(@"Crediantials done ");
        [[chALLENge sender] useCredential:newCredential forAuthenticationChALLENge:chALLENge];
    } else {
        [[chALLENge sender] cancelAuthenticationChALLENge:chALLENge];
        NSError* error = [NSError errorWithDomain:@"Soaprequest" code:403 userInfo: [NSDictionary DictionaryWithObjectsAndKeys: @"Could not authenticate this request",NSLocalizedDescriptionKey,nil]];
        NSLog(@"Credentials are not valid");
        [mydelegate loginFailled:false];
    }
}



-(void) connection:(NSURLConnection *) connection 
didReceiveResponse:(NSURLResponse *) response {
    //[webData setLength: 0];
}

-(void) connection:(NSURLConnection *) connection 
    didReceiveData:(NSData *) data {
    NSLog(@"recevied data %@",data);
    webData=[NSMutableData dataWithData:data];
    [webData appendData:data];
}

-(void) connection:(NSURLConnection *) connection 
  didFailWithError:(NSError *) error {
    [webData release];
    [connection release];
}
-(void) connectionDidFinishLoading:(NSURLConnection *) connection {

    NSLog(@"Did Finish Loading done ");

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

    NSString *documentsDirectory = [paths objectATindex:0];

    NSString *pdfPath = [documentsDirectory StringByAppendingPathComponent:@"Filename.docx"];

    [webData writeToFile:pdfPath atomically:YES];

    [connection release];

}